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Electronics

 

PlasmaQuant MS Series 

184 

 

NOTE 

The correct threshold cannot be set just by winding the trim-pot a certain number of 

turns from its end stop. The op-amp output offset voltage = input offset voltage (+/-

1.8 mV maximum) x gain (20). This means the op-amp output offset voltage could be 

as low as -36 mV and as high as +36 mV, although it is typ/-5 mV the threshold 

must always be set above the op-amp offset voltage, usually ~6-7 mV above. Each 

board should always use the factory set threshold, therefore it should not be adjusted 

in the field.  

 

When the comparator detects a pulse, it triggers the D-flip flop, the non-retriggerable 

front-end of the 10 nS monostable circuit. The D-flip-flop will trigger on the edge of a 
pulse as small as 400 ps wide.  

This triggers the MC10198 monostable, which produces a 10 ns output pulse, and re-
sets the D-flip-flop to accept another pulse.  

The reason we generate one 10 ns output pulse regardless of the input pulse width is 

mainly because it allows the use of statistical analysis to predict the real pulse rate 
given the output characteristics of the electron multiplier.  

The monostable output is converted to TTLV then to LVDS (Low Voltage Differential 
Signaling), to provide a fast, low noise transmission to the control board, which is 
counting the pulses.  

The analog-over-range path is a current-to-voltage converter. If a steady current of 50 

µA is detected, the ANL-OVR output is activated, to indicate that the electron 

multiplier gain is too high, or that the number of counts for the gain selected is too 
high. There is a second stage inversion, due to the control board being configured such 

that if the cable to the amp/discriminator board is unplugged, the program will flag an 
over-range error. 

 

 

10.3.3

 

Sample Introduction Interconnect PCB  

The Sample Introduction PCB electronics perform the following functions:  

 

Drive the peristaltic pump  

 

Provide power to the Peltier cooler on the spray chamber  

 

Monitor the temperature of the spray chamber  

 

Interface the control PCB to the gas solenoids  

 

Interface the igniter and argon sensors to the control PCB 

 

Controls the small isolation valve  

A four layer PCB laminate was used mainly for its low EMC radiation properties. Ferrite 

inductors have been used extensively to reduce signals radiated or passed on through 
this PCB.  

Inductor L1 is a four turn inductor printed on the circuit board, with a clip-on ferrite 
providing the magnetic circuit.  

 

PCB overview 

Содержание Analytik Jena PlasmaQuant MS Series

Страница 1: ...Service Manual PlasmaQuant MS series ICP MS...

Страница 2: ...service analytik jena com http www analytik jena com PlasmaQuant is in Germany a registered trademark of Analytik Jena GmbH Microsoft and Windows are registered trademarks of Microsoft Corp The ident...

Страница 3: ...iation 15 1 4 7 Ultraviolet Radiation 15 1 5 ICP MS Equipment Caution Notices 15 1 6 Regulatory Compliance 16 1 6 1 Federal Communications Commission Advisory U S Only 16 1 6 2 Spurious and Harmonic R...

Страница 4: ...2 iCRC Gas Control 45 5 3 Safety and Operational Information 45 5 4 Specifications 45 5 5 Replacement Maintenance 46 5 5 1 Cover Removal Procedures to Access the Gas Control Box 47 5 5 2 Removal of S...

Страница 5: ...ving the Y axis drive mechanism 84 6 5 11 Removing the Z axis drive mechanism 85 6 5 12 Replacing the DC Supply Module 85 6 5 13 Removing Igniter Assembly 87 6 5 14 Calibrating Translator Platform 87...

Страница 6: ...ures 144 8 7 1 Cones 144 8 7 2 Detector Assembly 147 8 7 3 Mass analyzer Assembly 150 8 7 4 Ion Lens System 152 9 Quadrupole Controller 156 9 1 1 System Description 156 9 1 2 Quadrupole DC Power Suppl...

Страница 7: ...ment Interlocks and Sensors 180 10 3 Theory of Operation 182 10 3 1 System Control PCB 182 10 3 2 Amplifier Discriminator PCB 183 10 3 3 Sample Introduction Interconnect PCB 184 10 4 Safety Informatio...

Страница 8: ...S Series 8 14 2 Recommended Spare Parts List 206 15 Maintenance Forms and Checklists 211 15 1 Routine Maintenance Schedule 211 15 2 Operator Checklist 213 15 3 Preventative Maintenance Checklist 214 F...

Страница 9: ...erty This chapter describes the general and specific hazards you will encounter as you interact with the ICP MS and prescribes safety practices that can help protect you and your equipment Before inst...

Страница 10: ...fic hazards on and inside the ICP MS cabinet are directly identified with labels and multilingual warnings Observe these precautions when working near the relevant components WARNING Yellow triangles...

Страница 11: ...Communications Commission Table 1 Information symbols 1 4 General Safety Hazards This section describes the general hazards encountered with the ICP MS instrument and the safety practices to observe...

Страница 12: ...authorized by Analytik Jena 1 4 2 Electricity The ICP MS and some accessories contain electrical circuits devices and components operating at dangerous voltages Contact with these circuits devices and...

Страница 13: ...O2 connections depending on options selected Do NOT connect any other gases than those specified to the correct inlet fittings Use only instrument grade gases with your spectrometer If using cryogenic...

Страница 14: ...to an oxygen cylinder or gas line carrying oxygen Oxygen is incompatible with all flammable materials and should be stored separately Never allow oil greases and other readily combustible substances t...

Страница 15: ...the UV shield incorporated into the instrument RF enclosure enables you to view the plasma and operate the instrument without being exposed to unsafe levels of UV radiation NEVER look directly at the...

Страница 16: ...Rules which are designed to provide reasonable protection against such interference when operated in a commercial environment Operation of this equipment in a residential area may cause interference i...

Страница 17: ...Marking appearing on the rear of the product The documentation package that accompanies the product containing a copy of the Declaration of Conformity This Declaration is the legal declaration by Anal...

Страница 18: ...ntative maintenance attempted by unauthorized personnel will immediately void the warranty Unskilled improper or careless maintenance can create the risk of fire electric shock and various other hazar...

Страница 19: ...oid breakage and cuts Use caution when connecting tubing to the torch nebulizer and glass barbs and when removing and replacing pieces of broken glassware 2 3 Additional Resources This document pertai...

Страница 20: ...rom the instrument setup Verify performance sensitivity oxides doubly charges Vacuum System Drain and replace oil in rotary pump Clean exterior of pump Test vacuum interlock by attempting to start vac...

Страница 21: ...ng is _______ kPa psi Check that iCRC gas pressures are He 150 kPa 22 psi H2 100 kPa 16 psi Interlock Tests Turn off argon supply and light plasma Verify Low Argon error message is displayed Light pla...

Страница 22: ...ar the sample introduction PCB This chapter contains the circuit description of the sample introduction section of the sample introduction PCB 4 1 System Description The standard ICP MS sample introdu...

Страница 23: ...sma it rapidly undergoes the following transformation 1 Desolvation stage drying of the sample 2 Molecular decomposition 3 Formation of ions 4 2 1 Nebulizer A pneumatic nebulizer and a stream of argon...

Страница 24: ...ltic pump channel typically introduces internal standards or diluents NOTICE The standard pump and drain tubing supplied with the instrument are suitable for aqueous solutions only Tubing is available...

Страница 25: ...may not be required Sheath gas bypass tube can be installed Part 418 88067 0 Figure 4 4 10a Silicone tube 1 4 in I D with connector Part 418 88082 0 10b Transfer tube with argon connection Part 418 88...

Страница 26: ...ces the igniter and argon sensors to the instrument system control PCB Interfaces the small isolation valve Figure 4 6 Sample Introduction PCB Part 10 5 0220006800 4 3 Safety and Operational Informati...

Страница 27: ...agent Peristaltic pump tubing loses its elasticity with use Tubing which has lost its elasticity will not deliver the sample to the nebulizer correctly Always release the pump pressure bars and unhoo...

Страница 28: ...er to pump Part 418 88087 0 Standard ICP MS torch 2 4mm injector quartz Part 418 88060 0 Sheath Gas Transfer Tube with Argon connection quartz Part 418 88068 0 Standard nebulizer glass 0 4mL min Part...

Страница 29: ...ght to dissolve simple surface deposits NOTE For stubborn deposits and stains soak the torch overnight in aqua regia 1 3 solution of hydrochloric acid HCl and HNO3 WARNING Nitric HNO3 hydrochloric HCl...

Страница 30: ...tion through the system 2 If this does not clear the blockage remove the nebulizer as instructed in section 4 5 2 page 30 and continue 3 Soak the nebulizer overnight in 10 nitric acid HNO3 or concentr...

Страница 31: ...lution from the nebulizer cleaning tool 8 Place the nebulizer once again in the holder and move the plunger three times quickly in and out to remove the cleaning solution also from the nebulizer 9 Rem...

Страница 32: ...p Tubing 1 Disconnect the sample capillary from both ends of the pump tubing 2 Disconnect the drain tubing from both ends of the pump tubing 3 Disconnect any other pump tubing internal standard diluen...

Страница 33: ...bing from solution temporarily 11 Turn the pressure screw counterclockwise until the de ionized water stops flowing in the tubing The fluid in the tubing may actually begin to recede at this point 12...

Страница 34: ...duction Information provided in this section relating to the gate and isolation valves refers only to the gas control system components Information about iCRC gas control previously contained in the s...

Страница 35: ...rs gas pressure from the argon inlet supply hose This switch is factory set and connected to the ASSY PCB SAMPLE INTRODUCTION 10 5 0220006800 If the argon inlet pressure drops below 460 5 kPa 66 0 75...

Страница 36: ...functions within gas control assembly The mass flow controller MFC supplies a specified flow of argon gas The mass flow controllers are connected directly to the system control PCB An analog voltage f...

Страница 37: ...asmaQuant MS Series Gas Control System 37 Figure 5 2 Gas box assembly block diagram Figure 5 3 The sheath and nebulizer gas mass flow controllers white along with the nitrox mass flow controller chrom...

Страница 38: ...in chassis behind and to the left of VC3 Large isolation valve control cable is connected to iCRC gas box shown on the right picture 5 1 2 iCRC Gas Control The iCRC gas box is located in the main inst...

Страница 39: ...he mechanical configuration of the iCRC gas box allows He or H2 gas to be delivered to the skimmer cone The two gases cannot be directed simultaneously to the skimmer cone i e no mixing of gases occur...

Страница 40: ...feedback proportional to He H2 pressure Pressures below the minimum specification range will cause the firmware to trigger the PC software error low high iCRC hydrogen helium pressure Figure 5 7 Assy...

Страница 41: ...is measured 5 2 Theory of Operation 5 2 1 Instrument Gas Control The sample introduction PCB interfaces with the system control PCB with a 40 way ribbon cable and controls the following gas box items...

Страница 42: ...mand from the system control PCB enables the instrument argon supply solenoid The solenoid connects to the sample introduction PCB and has a kicker circuit to enhance the pull in while running the coo...

Страница 43: ...ets their flow rate MFC1 TP12 MFC2 TP13 MFC3 TP2001 Using the software you can set the maximum argon gas flow at 1 5 L min Each mass flow controller provides an output voltage that is proportional to...

Страница 44: ...s In the event of an argon supply failure the gate valve remains in the same position If this occurs during analysis the vacuum system will automatically shut down due to a high pressure failure The i...

Страница 45: ...a gross error in the flow rate you must replace the defective unit with a new one ALWAYS operate the mass flow controllers in a vertically upright position Operating a mass flow controller on its side...

Страница 46: ...nal 0 to 5 VDC Accuracy 1 of full scale Calibration gas Argon Flow range 0 to 1 5 L m Incremental adjustment 0 01 L m Table 5 Instrument gas control specifications NOTE There are three Mass flow contr...

Страница 47: ...al of instrument covers to access gas control box A Figure 5 13 Removal of covers to access gas control box B Remove two screws of back panel Remove three screws of door panel on the back side Open th...

Страница 48: ...o 3 Remove screw securing metal sample introduction bracket to instrument body 4 Remove metal bracket with sample introduction PCB attached and set on clean surface 5 Remove all 5 screws securing PCB...

Страница 49: ...s outlet lines and serial cables from each MFC 5 To remove the MFCs from the bracket remove the two screws underneath each MFC 6 When replacing or swapping MFCs ensure that gas inlet and outlet lines...

Страница 50: ...ecuring the inlet manifold on the frame showing in the picture above 3 Disconnect the argon inlet solenoid and argon pressure switch cables from the sample introduction PWB 4 Remove the Swagelok fitti...

Страница 51: ...removing for easy identification 3 Remove the argon gas supply tube to the inlet of the manifold at the supply regulator RG1 4 Remove the solenoid cables from the sample introduction PWB at the PWB an...

Страница 52: ...e flows within the plasma tab at the instrument setup 3 In the software go to the diagnostics module and select the Plasma Status Control page 4 Check that each increment of the plasma flow 1 5 3 6 an...

Страница 53: ...ning to be accessed by the outside as the RF door must be closed to activate the flows within the plasma tab at the instrument setup 3 Check that each increment of the auxiliary flow 0 15 0 3 0 6 and...

Страница 54: ...ke a photo before removing for easy identification Sheath and nebulizer MFCs are NOT interchangeable with nitrox MFC To replace the assembly use the same procedures in reverse 5 5 9 Checking Sheath Ga...

Страница 55: ...roller device controls these flows If the flow rates for the nebulizer gas are incorrect replace the mass flow controller 5 5 11 Adjusting Gate Valve Figure 5 22 Adjustment of gate valve If the gate v...

Страница 56: ...uence 10 Monitor gauge 1 gauge 2 if installed and turbo 1 parameters to inspect for vacuum leaks NOTE The mechanism should travel smoothly along the rails until the door O ring begins to contact the c...

Страница 57: ...System 57 Figure 5 23 iCRC box assembly 1 Remove the iCRC box assembly as per section 5 5 1 page 47 2 Remove the iCRC box assembly cover by removing the appropriate screws Figure 5 24 Removing the Hyd...

Страница 58: ...or by gently using pliers 3 Replace in reverse of removal Figure 5 25 iCRC helium and hydrogen pressure sensors Inspect the O rings located on the iCRC solenoid valves and replace if required Figure...

Страница 59: ...PlasmaQuant MS Series Gas Control System 59 Figure 5 26 Showing O rings on iCRC solenoid valves...

Страница 60: ...n The plasma generating system of the instrument consists of RF generator module DC supply module Translation mechanism Filter PCB Control wiring Figure 6 1 Block diagram of the plasma generating syst...

Страница 61: ...r temperature Samples introduced into the ICP heat to at least 5000 K while the nitrous oxide acetylene flame the hottest flame in general use for spectroscopy can reach only 3200 K At the high temper...

Страница 62: ...e drive voltages The circuit allows for reduced components in comparison to other plasma generation systems and therefore a relatively inexpensive RF power generator for exciting and sustaining argon...

Страница 63: ...voltage to both sides of the load coil This voltage in turn dissipates to zero as it reaches the center of the coil The duration of time that each set of FETs remains enabled equals a half cycle of th...

Страница 64: ...coil Locate the water distribution manifold in the lower right corner of the main instrument chassis Figure 6 7 Water distribution manifold NOTICE The generator is built and tested prior to being pla...

Страница 65: ...position of Depth 10 mm Vertical 0 mm Horizontal 0 mm The depth mechanism or Z axis is a belt driven screw mechanism The mechanism pulls the translator table in and out from the tip of the sampler co...

Страница 66: ...tive to position mm for vertical mechanism The horizontal mechanism or X axis is a direct drive lead screw Locate the horizontal stepper motor under the center rear section of the translation mechanis...

Страница 67: ...Table to run value Ramp plasma gas to run value Figure 6 9 Default ignition parameters 6 3 Safety and Operational Information You must use the methods described in this section when servicing the pla...

Страница 68: ...l 5 mm in 0 1 mm increments KH42KM2 X817 2 76 V 2 3 ohm Outside RF compartment Below RF enclosure 1 8o Belt drive s lead screw arrangement 0 43 Amps Depth axis Range Stepper motor Location Motor step...

Страница 69: ...ains procedures for the access removal and replacement and maintenance of field serviceable components and assemblies of the plasma generating system 6 5 1 Repairing RF Generator Due to design changes...

Страница 70: ...nd auxiliary tubing from torch connections 5 Slide the torch out of the rear of the torch clamp away from the sampler cone 6 Replace the torch into the rear of the torch clamp toward the sampler cone...

Страница 71: ...ation 71 Figure 6 10 Cooling water enable box 10 LED Water Flow Detected will illuminate GREEN 11 Open the Plasma door and check for water leaks Figure 6 11 4 mm Allen screws securing RF generator Fig...

Страница 72: ...s procedure provides information on how to remove replace and align the load coil Figure 6 14 Replacement plasma coil 1 Refer to section 6 5 5 to remove the torch and RF generator Using the plasma coi...

Страница 73: ...ont of the RF generator 4 Tighten the Swagelok fittings by hand and tighten an extra turn using a wrench 5 Proceed to next topic for plasma coil alignment before replacing RF Generator Figure 6 15 Tig...

Страница 74: ...allel with the right edge of the PEEK frame that holds the work coils see Figure 6 16 3 A little gap must be visible on the top edge of the torch holder when the clamp is open Figure 6 17 4 Open the t...

Страница 75: ...ol in plasma coil 7 Position the alignment tool according to Figure 6 20 below 8 The upper left edge left dashed line must be parallel to the torch holder The gap must be horizontal on the upper side...

Страница 76: ...ed alignment tool 11 Gently press the plasma coil a little with the alignment tool such that the gap shown by the yellow arrow is minimized Figure 6 21 Using alignment tool in reverse to adjust plasma...

Страница 77: ...a well aligned plasma coil 13 Remove the alignment tool 14 Replace torch as per Section 6 5 5 page 70 Figure 6 23 Properly positioned torch within plasma coils 15 Verify the distance between coil and...

Страница 78: ...ction 6 5 5 page 70 Use the following procedure to adjust the spacing between winding of the work coils This will help ensure consistent ignition of the argon plasma 1 Ensure that torch is installed a...

Страница 79: ...ally at 180 V If 500 W is achieved below 175 V squeeze the coils no more than 0 5 mm and re perform the above procedure If you reach 185 V and the power is below 500 W stretch the coils no more than 0...

Страница 80: ...the water chiller off 3 Remove the rear panel of the instrument main RF door to expose the rear of the RF enclosure Figure 6 27 Figure 6 27 Rear of RF enclosure showing RF Filter assembly 4 Disconnect...

Страница 81: ...Ensure the instrument vacuum is vented and shut off the instrument power Ensure the water chiller is turned off 2 Remove the torch and RF generator as per section 6 5 5 page 70 and remove the RF Enclo...

Страница 82: ...remove the screws completely 6 While accessing from the plasma compartment door opening gently lift the back of the translator table off the z axis rail 7 Move the translator table slightly forward t...

Страница 83: ...ve mechanism This section provides information on how to remove the X axis drive mechanism It is assumed that you have already removed the translator platform For instructions on removing the translat...

Страница 84: ...g bracket and into the locking collar 8 Replace the screws in the mounting bracket to secure the lead screw 9 Align the marks on the mounting bracket and translator platform then tighten the Allen scr...

Страница 85: ...s on removing the translator platform please refer to section 6 5 8 page 81 1 Remove the instrument cover from the main RF door assembly and locate the Z axis drive mechanism Figure 6 33 Z axis drive...

Страница 86: ...t the main power cable from the supply Turn the water chiller off 2 Remove the main RF door panel and upper front RF door sub assembly cover 3 Remove the gas box cover Refer to section 5 5 1 page 47 i...

Страница 87: ...to calibrate the torch position of the translator platform This procedure must be performed every time the plasma coil or the RF generator is replaced CAUTION Before attempting to remove the torch ver...

Страница 88: ...ned replace the X Y alignment tool with the Z axis alignment tool plasma alignment tool WITHOUT the coil alignment apparatus Figure 6 38 into the torch clamp Do NOT close the clamp and do NOT use the...

Страница 89: ...a Generation 89 Figure 6 39 Properly calibrated translator showing 5 mm gap NOTICE NEVER press Save as calibration unless the z axis alignment tool is properly positioned as given in step 7 If not dam...

Страница 90: ...etails on the interface assembly ion lens assembly or the mass analyzer assembly 7 1 System Description The instrument vacuum system is a differentially pumped tri chamber high vacuum system that samp...

Страница 91: ...d forms part of the interface assembly When the gate valve is closed VC1 is isolated from the other two vacuum chambers The gate valve enables the vacuum system to pump while the plasma is off This mi...

Страница 92: ...operating pressure when the gate valve is open and the plasma on is 4x10 4 Torr The base pressure achievable after 24 hours of pump down time is typically 1x10 6 Torr this pressure can be monitored o...

Страница 93: ...ble 1x10 7 Torr 7 2 Theory of Operation 7 2 1 Vacuum System Start up To initiate the vacuum system press the Vacuum button from the main menu in the Aspect MS software Figure 7 5 Initiating the vacuum...

Страница 94: ...the controllers are operated by SUB D 15 pin connector from the system control PCB each controller must be configured by the Aspect MS software for identification by the system control PCB Backing pre...

Страница 95: ...ce The vacuum system is designated as being in standby mode when the plasma is off the gate valve is closed and both turbo molecular pumps and rotary pump are running Standby mode allows chambers VC2...

Страница 96: ...e When this sequence is started the gate valve is closed and the plasma is extinguished if it s running All vacuum pumps are turned off and the RF generator and quadrupole supplies are disabled The to...

Страница 97: ...nce the vent device will open automatically 7 2 4 Vacuum Vent Device Figure 7 8 Vacuum vent device installed on the PFEIFFER turbo molecular pump Under normal operating conditions the vacuum system is...

Страница 98: ...is filtered by a sintered filter screwed to the outer body of the vent device The sintered filter does not need to be replaced as part of the instrument preventative maintenance 7 2 5 The Thermocoupl...

Страница 99: ...r PTR 225 S is a compact active pressure converter that houses a PENNINGVAC measurement system as well as the corresponding operating electronics They have been developed specifically for integration...

Страница 100: ...ressure 3x10 9 mbar An LED indicates this status Operation of the penning vacuum gauge in the pressure range above 10 2 mbar will cause accumulation of contaminants and will reduce the service life Fo...

Страница 101: ...or by pressing it again decreased towards 500 mbar until the button is released or the limit is reached 4 Evacuate to p 10 4 mbar recommended or to a pressure in the range of 10 4 10 2 mbar and wait...

Страница 102: ...urbo1 and Turbo2 The turbo molecular pumps Turbo1 and Turbo2 are OEM units manufactured by PFEIFFER Germany Turbo1 is a PFEIFFER pump and is located on the bottom of the vacuum chamber directly connec...

Страница 103: ...ble defines the instrument vacuum system specifications Vacuum Chambers Number of chambers 3 Total volume 13 liters approx Sampler cone material Nickel or platinum tipped Skimmer cone material Nickel...

Страница 104: ...ler Vacuum Vent Device Vent Valve High vacuum flange DN 10 KF Gas entrance Rifled nozzle 4 8 mm OD Orifice size 0 8 mm 0 03 Pressure range 10 7 Torr to atmosphere Leak rate 1 x 10 7 mbar l s Input vol...

Страница 105: ...2 7 mbar Output 0 11 mv with 165ma heater current and 15 ohms load Heater Resistance Approximately 1 4 ohms Materials Nickel plated mild steel glass platinum Cones Nickel Supplied standard with the in...

Страница 106: ...el cleaning powder 418 88075 0 Powder free Latex gloves Lint free cloth or lint free towel Ultrasonic bath Compressed argon or nitrogen Supply of distilled de ionized water Caustic cleaning detergent...

Страница 107: ...he pump in place 2 Remove the two screws securing the water cooling block to the turbo pump and set the block aside 3 Disconnect the control cable from the turbo controller NOTICE When refitting the t...

Страница 108: ...te valve plunger to the gate valve doorframe Slide the plate off the doorframe and separate the piston shaft from the doorframe 5 Remove the six screws that secure the gate valve door assembly to the...

Страница 109: ...operation and then every 3 months Please refer the Service Info SI_form_MS_002_Leybold SV40 pump from extranet Figure 7 15 PQMS rotary vane pump oil change guide The above information is for LVO 200...

Страница 110: ...pump oil LVO 200 or LVO 420 7 Wipe down the pump to remove excess oil 8 Check and replace oil exhaust filter if needed 7 5 4 Maintaining Turbo molecular Pumps The PFEIFFER HiPace 300 does not require...

Страница 111: ...the vacuum system and shut off the instrument 2 Remove the front panel of the instrument 3 Disconnect the cable from the thermocouple gauge head 4 Use a 9 16 wrench to remove the gauge head NOTE Befor...

Страница 112: ...unwanted particles after they are rejected by the ion optics Turbo molecular pump 2 Turbo2 maintains the pressure in VC3 It is positioned on the side of the extruded aluminum housing VC3 contains the...

Страница 113: ...RF power applied to a plasma coil induces strong magnetic fields inside a quartz torch to form a plasma of argon gas Three tubes are connected to the torch two tubes deliver argon and a third carries...

Страница 114: ...complicated by the very high temperatures 6 000 10 000 K and the high power radio frequency currents present in the plasma While the plasma coil virtually grounded solves the problems associated with...

Страница 115: ...this mixture and focuses only the ions into the mass analyzer Figure 8 3 Stages of the plasma as it enters VC1 and VC2 The gate valve separates the first and second vacuum chambers It is essentially a...

Страница 116: ...o the vacuum chamber and are pumped away Turbo1 is mounted with two screws to the interface assembly Removing the turbo1 exposes the corner lens mirror lenses entrance lenses and the gate valve mechan...

Страница 117: ...to the mass analyzer by an ion mirror arrangement The ion mirror is a flat ring of four electrodes As the beam of ions and neutral gas approaches the ion mirror the ions are repelled by electrostatic...

Страница 118: ...ced by the electrostatic fields produced by the ion lenses and they do not reflect through the ninety degree angle and enter the mass analyzer Instead they pass directly through the opening in the mir...

Страница 119: ...electrical insulator compatible with high vacuum and easily machined Although these materials are electrical insulators it is important that they are not directly exposed to the ion beam The ion beam...

Страница 120: ...ng 4 ZrO washers and a 0 5 mm thick dielectric pad The mounting screws must be tightened to a specific torque of 0 8 N m to prevent overheating and therefore damage to the isolating pad skimmer cone O...

Страница 121: ...2 accelerates the beam keeps it parallel and directs it toward E3 The interaction between E3 the mirror segments and the corner lens controls the field to reflect the ion beam The extraction lens volt...

Страница 122: ...will leak and the entire feedthrough must be replaced Figure 8 13 a Supplies for E1 and E2 enter the interface assembly via separate vacuum feedthroughs The E1 feedthrough is located in the top of th...

Страница 123: ...of the mirror lens over a conventional barrel type lens is that it focuses all ions onto the same point independent of their individual mass charge ratios A barrel ion lens cannot maintain a single fo...

Страница 124: ...ace assembly casting The corner lens creates a positive electrostatic field This electrostatic field combined with the field created by the mirror lens creates a parabolic electrostatic field Without...

Страница 125: ...ction lenses the corner lens and the mirror lens There are two lenses positioned at the front of the mass analyzer assembly The first is known as the entrance lens and the second is known as the entra...

Страница 126: ...om the mirror to the entrance lens plate Due to this bombardment the lens surface becomes contaminated after prolonged use The proximity of the entrance lens and plate relative to each other and the f...

Страница 127: ...he fringe filter contains curved rods Figure 8 20 The terminal block provides the interface for the fringe bias entrance plate entrance lens and exit lens supplies The terminal block provides an elect...

Страница 128: ...tput current exceeds the limit set by the amplifier discriminator electronics Figure 8 21 All the ion optics voltages are variable under software control via the Aspect MS service diagnostics 8 3 4 Ma...

Страница 129: ...component of the quadrupole drive signal a DC bias of 10 V to 10 V can be applied using the software A fringe field also exists at the exit to the quadrupole however an exit fringe filter assembly is...

Страница 130: ...tio have stable paths through the quadrupole Any ion not of the selected mass charge ratio will be unable to maintain a stable path through the entire length of the quadrupole hence it will collide wi...

Страница 131: ...cross section of the quadrupole rods and the ion trajectory and b an ion of the correct mass to charge ratio traveling the entire length of the quadrupole oscillating a frequency of 3 MHz Two 30pF ce...

Страница 132: ...to RF maximum potential and the quadrupole controller unit delivers the appropriate voltages to the quadrupole Figure 8 27 Aspect MS software Resolution and Trim page in the instrument module The auto...

Страница 133: ...ctor s function is to produce a pulse of electric current for each ion that emerges from the quadrupole while avoiding the effect of unwanted neutrals and electromagnetic radiation The detector consis...

Страница 134: ...h dynode is linked with a resistor of equal value to provide the voltage division The final dynode is near ground earth potential and the number of electrons which strike the surface causes a pulse of...

Страница 135: ...threshold cannot be calibrated in the field All spare discriminator circuit boards are calibrated before leaving the factory The electron multiplier gain increases with the applied high voltage It is...

Страница 136: ...ing a single isotope scan using a moderate intensity signal 1E04 to 3E05 c s The isotope closest to the center of the mass range typically indium defined in the method is selected for the detector sca...

Страница 137: ...tage increase the current out of the detector doubles If the detector operating point is near the start of the detector curve plateau counts will be reasonable and current out of the detector will be...

Страница 138: ...omplete view the detector attenuation factor table All of the factors for Norm Med and Med High attenuation should be approximately in the range of 30 150 and 30 150 respectively for the elements 9Be...

Страница 139: ...matrix being analyzed For example samples containing high concentrations of organics will contaminate the system quicker than clean water samples Cleaning of the ion optics system is typically requir...

Страница 140: ...ect on the entrance plate voltage setting Fringe bias Sharp Sharp 10 to 10 Typically 1V to 3V applied to the fringe rods will be sufficient in PPQ mode Increasing the negative voltage usually reduces...

Страница 141: ...tector focus lens Not adjustable Not adjustable 580 or 160 The detector focus lens is not adjustable and is controlled by the software firmware Pole bias Moderate Moderate 10 to 10 Do not adjust the p...

Страница 142: ...ents and corner lens are only cleaned if necessary 1 Remove the cones from the interface assembly using the correct tools and by following the procedure outlined in this manual in Section 8 7 2 Create...

Страница 143: ...to aid the drying process as this may contaminate the clean surface Only clean the quadrupole if it is contaminated and if the instrument performance is poor and does not meet specification after clea...

Страница 144: ...l instructions may be available in the help files 8 7 1 Cones Special tools are required to remove the cones The cones form part of the vacuum system They must be handled with gloved hands The tip of...

Страница 145: ...the orientation of the tabs on the cone These tabs ensure the correct orientation of the cone when placing it back into the interface 3 Refit the sampler cone tool to the sampler cone clamp if removed...

Страница 146: ...ed on the outside edge of the cone and are fragile 3 Remove the skimmer cone from the tool using gloved hands and place on a clean surface 4 The skimmer cone has two different sized O rings located on...

Страница 147: ...minator Attenuator as a twist lock connection 5 Disconnect the serial cable which interfaces with the attenuator on the bottom side and the P3 P4 cables from the top 6 Disconnect the Ethernet cable fr...

Страница 148: ...sting on the top of the discriminator 2 Remove the grounding ribbon cable by removing the screw on the bottom of the plate under the detector 3 Remove the SMA cable connector from the detector using a...

Страница 149: ...3 P4 cables from the top 5 Disconnect the Ethernet cable from the side of the discriminator and the SMA cable from the top of the discriminator 6 Remove the 4 screws fitting the attenuator discriminat...

Страница 150: ...ection 8 7 2 page 147 remove the Detector Assembly from the instrument 5 With the detector assembly removed loosen the two screws holding the quadrupole supply tabs onto the quadrupole assembly using...

Страница 151: ...of the mass analyzer assembly is not recommended in the field yet possible Procedures for this cleaning will be posted is supplemental documents Figure 8 40 View of the vacuum housing from the quad fl...

Страница 152: ...Open VC2 by removing turbo1 as per section 7 5 1 page 106 4 Use a clean Phillips screwdriver to loosen the three screws holding the ion mirror assembly in place 5 Use a gloved hand to slide the gate v...

Страница 153: ...ically require cleaning During routine cleaning simply remove the corner lens from extraction lens 3 and leave it connected to the wire Remove the plastic tubing from the pins and the PEEK insulator w...

Страница 154: ...tool into the lens 4 Rotate the lens in either direction until the tabs line up with the recesses in the holder and remove the lens 5 Repeat steps 3 and 4 for the entrance plate NOTE Note that the en...

Страница 155: ...PlasmaQuant MS Series Mass Spectrometer 155 Figure 8 45 Entrance lens and entrance plate removal tool...

Страница 156: ...anufactured by Analytik Jena It is a precision power supply responsible for driving the mass analyzer assembly with two balanced RF and DC potentials It controls the ratio of RF to DC signal and the m...

Страница 157: ...itch mode supply The 60 W secondary switch mode supply manufactured by Analytik Jena generates 600 V 26 V and two 24 VDC supplies The 600 V and 26 V supplies are used by the control PCB and the 24 V s...

Страница 158: ...ative high voltage regulator the DC control of the RF servo loop and the error detection circuits for the DC and RF outputs 9 1 5 RF Modulator and Driver The modulator PCB converts the DC drive signal...

Страница 159: ...be removed by loosening the N type connectors 9 2 Theory of Operation The quadrupole controller produces two control signals with variable ratio and magnitude When applied to the quadrupole rods the...

Страница 160: ...ndary converter has a directly regulated 24 V output and five indirectly regulated outputs These include 24 V for the two cooling fans 30 V for low voltage supply to the DC control circuit and 600 V f...

Страница 161: ...eans of base modulation Output from the collector of Q4 is buffered by Q1 to drive the pre driver Q2 Q9 forms a Class A driver stage with shunt shunt feedback delivering an output of up to 20 V peak t...

Страница 162: ...ween the resistor and the thermistor dissipates the heat generated by R204 a 10 W 47 ohm resistor An LM317 regulator is a failsafe device in case of a thermistor malfunction An over temperature condit...

Страница 163: ...y is rated at 60 W One of the quadrupole controller switch mode power supplies is similar to one used in the OEM DC supply module but they are NOT interchangeable The circuit diagrams are not provided...

Страница 164: ...he Analytik Jena factory for all repairs 9 3 1 Removing Quadrupole Controller Follow these steps to remove the quadrupole controller assembly from the instrument WARNING There are no field serviceable...

Страница 165: ...the bottom of the quadrupole controller 8 Disconnect the two capacitors look like small PCBs from the cable attached to the coaxial looms 9 Disconnect the two coaxial cables from the rear of the quad...

Страница 166: ...eries 166 Figure 9 6 Connections at bottom of quadrupole controller Figure 9 7 9 pin D range connector for quadrupole controller 10 Now you can slide the entire quadrupole controller out the top of th...

Страница 167: ...ection 8 7 2 page 147 and set on a clean surface 3 Remove mass analyzer assembly as per section 8 7 3 page 150 and set on a clean surface 4 Remove the 4 Philips screws securing the feedthrough housing...

Страница 168: ...ontroller as per section 9 3 1 page 164 Figure 9 10 View of the quadrupole drive looms from under the vacuum housing Figure 9 11 The quadrupole drive looms Figure 9 12 The quadrupole drive vacuum feed...

Страница 169: ...f the Aspect MS software type koala as password 2 The rest mass sets the quadrupole controller output when it is not scanning The default rest mass is 145 5 AMU This is important to ensure that this i...

Страница 170: ...0 to10 V with two clip style probes 3 mm Allen key Small flat blade screwdriver approximate blade width of 4 mm Remove 4 screws on top of the Quadrupole Controller s resonation cover as shown in Figu...

Страница 171: ...sonation process 4 Toggle the switch SW402 to the CAL calibration position The switch is in the CAL position when it is toggled downwards or closest to the potentiometer RV401 Figure 9 16 Quadrupole c...

Страница 172: ...ximum position rotated completely clockwise RV401 is the manual RF level control when the quadrupole controller is configured for CAL mode using SW401 As the rotational position of RV401 nears maximum...

Страница 173: ...PCB The following list briefly summarizes the function of each major assembly connected to the system control PCB The sample introduction interface PCB 10 5 0220006800 contains the control and sensin...

Страница 174: ...m Functionality The vacuum system includes one rotary pump two turbo pumps each containing a turbomolecular pump controller two gauges and a vent device The Aspect MS software displays the status of t...

Страница 175: ...m pressure in VC2 is monitored and is referred to in the software as GMain TTR 91 The loom is connected to the systems control PCB and terminated at the gauge with an RJ45 connector Figure 10 3 Thermo...

Страница 176: ...control PCB The thermal trip sensors for over current protection are also located in the AC input module Contains a single relay for supplying both turbo controllers with mains power Provide power to...

Страница 177: ...asma auxiliary nebulizer Sheath and Nitrox Elite models only gas flows are included in the plasma system The system control PCB controls the plasma and auxiliary gas flows via the sample introduction...

Страница 178: ...4 V Peristaltic pump drive connected directly to the pump motor by a three pin connection providing a drive return and ground signal Peristaltic pump power two 24 V supply lines Cooled spray chamber P...

Страница 179: ...rol PCB to vary the voltage on dynode 4 The Electrical Box module supplies mains power to the quadrupole controller The mains switching relay located inside the Electrical Box and is activated by a 24...

Страница 180: ...mp power 10 2 7 Instrument Interlocks and Sensors There are seven safety interlocks and several sensors incorporated into the instrument control circuitry The safety interlocks protect the operator ag...

Страница 181: ...the water flow temperature and flow solenoid via a single loom to the water manifold PCB Water flow sensor is located above the instrument water manifold on the outlet flow port It is a magnetic reed...

Страница 182: ...the PC by a USB cable Provide power and monitoring of the interlock circuit which powers the contactors supplying mains power to the rotary pumps turbo pumps quadrupole controller and the DC supply f...

Страница 183: ...plitude voltage is generated by current pulses through a 50 ohm termination and pulse widths as small as 3 ns at these amplitudes 3 10 ns pulse widths expected It is ready to detect another pulse 15 n...

Страница 184: ...stable output is converted to TTLV then to LVDS Low Voltage Differential Signaling to provide a fast low noise transmission to the control board which is counting the pulses The analog over range path...

Страница 185: ...error amplifier whose output depends on the difference between the pump speed set point PERI PUMP and the measured pump speed The output voltage at U8 pin 1 is used to control the pulse width modulati...

Страница 186: ...r back EMF voltage to the sample and hold capacitor C49 This voltage across C49 is buffered by U7 pins 5 7 and used as the speed feedback signal until the next sampling period Current limiting protect...

Страница 187: ...output Relay K1 also requires both positive and negative 15 V rails to be good to pull in Fuse F1 protects the Peltier in the event of a switch short in U1 U11 provides some protection from static an...

Страница 188: ...Thermistor results and possible causes for spray chamber fault monitoring This can be used by the firmware software to report abnormal conditions and put the system in a safe state if necessary 10 4...

Страница 189: ...warning could expose the operator to high voltage resulting in death or serious injury 11 2 System Description The ICP MS power supply assemblies are listed below Ion Optics Detector supply PCB Quadr...

Страница 190: ...k of the quadrupole controller and not from the vacuum housing It is located near the top of the instrument above the system control PCB and Ion Optics Detector supply PCB For calibration and troubles...

Страница 191: ...laced as a complete module For circuit descriptions refer to section 6 2 page 60 For replacement procedures refer to section 6 5 7 page 80 11 2 5 Utility Module The instrument is available in a single...

Страница 192: ...g in death or serious injury The fact that most of the high voltage sources on the board are low energy does not suggest that requirements for safe practices are relaxed Both under the nominal or faul...

Страница 193: ...ad conditions interface and control circuits provide means for bidirectional communication with the CPU board and controls operation of the functional blocks The board setup information is provided fr...

Страница 194: ...unicates with the detector power supply via the shared serial interface All messages sent to and from the detector control circuits are relayed via this board The CPU cannot be directly connected to t...

Страница 195: ...nt of bits sent to the CPU board Notes 1 The firmware does not currently conduct a test for the DACs However for completeness the description is as follows If this bit can be toggled by the interface...

Страница 196: ...ndom or pseudorandom nature The nominal output current is the maximum current expected under normal operating conditions e g no excessive leakage due to arcing short connections or other abnormal caus...

Страница 197: ...vel While the testing and servicing at the board level mainly requires commonly available tools and instruments such as a multimeter and high voltage probe the repair at the component level may requir...

Страница 198: ...ese questions The output status of the board can be tested remotely from a PC accompanying the instrument Each output is assigned with a flag that is activated in a case there is a mismatch between se...

Страница 199: ...top middle stand off Blinks off once when DACs on board are updated dimmed flashing during normal operation while the interface is active permanently ON or OFF when the interface is idle LED10 on cont...

Страница 200: ...or the ion optics electrodes A general purpose ohm meter multimeter can assist troubleshooting of some such problems but in some cases the voltage and current it applies may not be sufficient to pin...

Страница 201: ...is test does not examine the interface part used by the detector power supply Measurement of output voltages The actual value seen at the HV outputs is not fed back to the firmware so these outputs mu...

Страница 202: ...ct operation of the detector focus protection can only be determined by measuring the detector focus output During a scan the detector focus output should switch repetitively between the set point vol...

Страница 203: ...QMS product line a separate manual has been developed specifically for troubleshooting Due to being a relatively new product it is expected that the troubleshooting guide will evolve and grow during e...

Страница 204: ...for the PQMS and its sub assemblies are located on the extranet It is required that only senior regional engineers access these documents in order to insure both safe troubleshooting practices are str...

Страница 205: ...diness for use in a vacuum system therefore they do not require cleaning prior to installation Their packaging identifies these items they are wrapped in aluminum foil The labeling indicates that the...

Страница 206: ...10 5500 001 14 Assy Quadrupole complete 16 10 5200 201 83 Assy Air Flow Sensor Plasma Exhaust PWB 17 10 5100 835 11 Assy Igniter module 18 10 5500 150 14 Assy Detector Mount complete 19 10 406 250 SV...

Страница 207: ...olation Valve Solenoid 58 10 5000 270 24 Translator Kit 1 Vertical 59 10 406 144 Translator belt Vertical 363 60 10 5000 271 24 Translator Kit 2 Depth 61 10 406 151 Translator belt Depth 140 62 10 550...

Страница 208: ...000 Neb socket 91 10 5 1610130300 Sheath socket 92 10 405 573 USB Adapter NAUSB W 93 10 5 1910012200 Circuit Breaker 3ph 10A Therm Mag DIN 94 10 5 1920000100 Circuit Breaker 2 pole 25A B Type 95 10 55...

Страница 209: ...upplies 128 10 5 0120010700 Assy Lower Mains to Upper Mains 129 10 5 0120012900 Assy Loom iCRC Manifold 130 10 5 0120013000 Assy Loom iCRC Gasbox 131 10 5 0120013100 Assy Loom Water Manifold 132 10 5...

Страница 210: ...0 5 0120018000 Assy Loom Large Isolation Valve 153 10 5 0120018200 Assy Loom 24VDC Chassis Fan 154 10 5 0120018500 Assy Loom Igniter G Valve Peri Pump 155 10 5 0120018900 Assy Loom Switch Flow 156 10...

Страница 211: ...mer both sign the document Then place the completed checklist all printouts and archived files on disk in the instrument logbook These will provide a valuable reference for future preventative mainten...

Страница 212: ...lost its elasticity Perform an instrument optimization Weekly Clean the torch Clean the sampler and skimmer cones Check the water level and condition in the water cooler and top up or replace if neces...

Страница 213: ...ionized water Weekly or as required depending on sample matrix Extraction lens 1 and 2 Clean using stainless steel cleaning powder then in an ultrasonic bath followed by de ionized water Every 3 month...

Страница 214: ...ivity oxides doubly charges Check Vacuum System Drain and replace oil in rotary pump Clean exterior of pump Test vacuum interlock by attempting to start vacuum with Turbo 1 dismounted Verify that appr...

Страница 215: ...all external covers Check argon inlet pressure allowed range is 600 830 kPa 90 120 psi Actual setting is _______ kPa psi Check that iCRC gas pressures are He 150 kPa 22 psi H2 100 kPa 16 psi Check In...

Страница 216: ...system Discuss condition preventative maintenance results and instrument performance with the customer Sign and date check list after obtaining customer s signature Instrument and environmental condi...

Страница 217: ...e electrical box 38 Figure 5 6 Transparent view of iCRC box 39 Figure 5 7 Assy loom iCRC gas box and Assy loom iCRC MFC 40 Figure 5 8 iCRC gas pathway schematic 40 Figure 5 9 Connection of Sample Intr...

Страница 218: ...erator mounting plate 82 Figure 6 30 Bottom of translator platform 83 Figure 6 31 Back of translator table showing locking collar and alignment marks 83 Figure 6 32 Y axis stepper motor mounting screw...

Страница 219: ...onnections 124 Figure 8 17 The corner electrode is mounted on a small PEEK bracket attached to extraction lens 3 125 Figure 8 18 Section view of the cones extraction lenses the corner lens and the mir...

Страница 220: ...drupole controller 165 Figure 9 6 Connections at bottom of quadrupole controller 166 Figure 9 7 9 pin D range connector for quadrupole controller 166 Figure 9 8 Screws securing the feedthrough housing...

Страница 221: ...mple of motor steps relative to position mm for vertical mechanism 66 Table 9 Example of motor steps relative to position mm for horizontal mechanism 66 Table 10 RF Generating system specifications 69...

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