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Models 947, 948 and 960 Leak Detectors Operations and Service Manual

G-8

G.7 Mass Spectrometer Leak Detector—Simplified Description

The 947/948/960 consist of an analytical sensing tube called a

spectrometer tube

,

electronics to operate the tube, and a vacuum system to maintain a very high vacuum
within this tube (usually less than 0.1 millitorr or about one ten-millionth of ordinary
atmospheric pressure).

In the spectrometer tube, gas molecules are ionized (given a positive electrical charge) by
bombarding them with electrons from a hot thoriated iridium filament. The ions, thus
formed, are accelerated into a magnetic field where the mass 4 (helium) ions are deflected
90° (see Figure G-5). Only helium ions reach the collector.

An extremely stable electrometer provides an electron current to the collector, which
neutralizes the current produced by the collection of helium ions. The

feedback

current is

presented on the leak rate bar graph. Since this current is directly proportional to the
number of helium ions striking the collector per unit time, the panel leak rate bar graph
directly reflects the concentration of helium in the vacuum system at any time. Any helium
entering the system causes an increased concentration of helium within the spectrometer
tube, which is reflected as an increase on the leak rate bar graph. In addition to the
electrometer, the electronics also provide suitable voltages to operate the spectrometer tube
and controls and instrumentation for the vacuum system.

Test pieces are generally

rough

pumped (or, if pressurized, the chamber in which they are

to be tested is

rough

pumped) by a mechanical vacuum pump before they are connected to

the spectrometer tube (see Figure G-5). This prevents overloading the vacuum pumping
system.

Figure G-5

Magnetic Separation Principle

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Содержание 948

Страница 1: ...vacuum technologies OPERATION AND SERVICE MANUAL Models 947 948 and 960 Leak Detectors Part No 699909947 Revision H March 2003...

Страница 2: ...ow MacroTorr TriScroll and ConvecTorr are trademarks or registered trademarks of Varian Vacuum Technologies Apiezon is a registered trademark of M I Materials Ltd Alconox is a registered trademark of...

Страница 3: ...Introduction to Models 947 948 and 960 Leak Detectors 1 1 1 1 Platform Electronics 1 4 1 2 Unpacking the 947 948 960 1 4 1 2 1 Unpacking Instructions 1 4 1 2 2 Removing the 947 948 960 from the Skid...

Страница 4: ...tup 3 3 3 2 1 Parameters and Operating Modes 3 3 3 3 Start Up 3 8 3 3 1 Startup Procedure 3 10 3 4 Calibration and Sensitivity Checks 3 11 3 4 1 Calibration and Sensitivity Checks 3 12 3 5 Operating P...

Страница 5: ...2 Calibration 4 27 4 2 7 4 1 Vacuum Low Pressure Calibration 4 27 4 2 7 4 2 Atmospheric Calibration 4 28 4 2 7 5 Test Port Pressure Gauge TC1 Calibration 4 29 4 2 7 6 Vacuum Low Pressure Calibration 4...

Страница 6: ...he Dry System Rough Pump B 21 B 4 2 2 1 Examining and Cleaning Centering Rings O rings and Manifold B 21 B 4 2 2 2 Re installing the Dry System Rough Pump B 21 B 5 Replacing the Forepump B 22 B 5 1 We...

Страница 7: ...pendix E 947 948 Specifications E 1 Appendix F Accessories F 1 Appendix G Leak Detection Theory G 1 G 1 Leak Testing Why is it Needed G 1 G 2 Classes of Leak Detection G 1 G 3 Terminology G 2 G 4 Vari...

Страница 8: ...Models 947 948 and 960 Leak Detectors Operations and Service Manual This page intentionally left blank...

Страница 9: ...ectrometer Tube Removal 4 13 4 3 Spectrometer Tube Disassembly 4 15 4 4 Spectrometer Tube Reassembly 4 16 4 5 Spectrometer Tube Reassembly Ground Slit Plate 4 17 4 6 Spectrometer Tube Reassembly Magne...

Страница 10: ...d and Exhaust Connections B 16 B 12 Rough Pump Manifold and Exhaust Connections B 18 G 1 Test Piece Evacuated Tracer Probe Used to Locate Leak G 6 G 2 Test Piece Evacuated and Hooded with Helium Atmos...

Страница 11: ...Error Condition Codes 5 2 5 2 Troubleshooting 5 3 C 1 Internal Operating Parameters C 2 C 2 Non volatile Operating Parameters C 5 C 3 Spectrometer Operating Parameters C 6 C 4 Command Parameters for...

Страница 12: ...Models 947 948 and 960 Leak Detectors Operations and Service Manual This page intentionally left blank...

Страница 13: ...en oder Richtlinie n bereinstimmt auquel se r f re cette d claration est conforme la auz norme s ou au x document s normatif s al que se refiere esta declaraci n es conforme a la s norma s u otro s do...

Страница 14: ...person including representatives of Seller which are inconsistent or in conflict with the terms of this warranty shall not be binding upon Seller unless reduced to writing and approved by an officer o...

Страница 15: ...ay be verified as required The data recorded below includes readings taken during the final test prior to shipment They are convenient for reference purposes if tuning adjustments are altered Slight c...

Страница 16: ...ll hazards associated with this equipment They must know how to recognize hazardous and potentially hazardous conditions and know how to avoid them The consequences of unskilled improper or careless o...

Страница 17: ...a large well ventilated room Alcohol methanol or other solvents are irritants narcotics depressants and or carcinogens Their inhalation and or ingestion may produce serious side effects Prolonged or c...

Страница 18: ...responsibility to maintain the level of tightness particularly when pumping dangerous products CAUTION The performance and operating safety of this equipment can be guaranteed only if it is operated a...

Страница 19: ...ges Always disconnect the power cord and any interface cables before opening the enclosure Do not touch the power inlet s contacts for at least 10 seconds after disconnecting the power cord CAUTION Th...

Страница 20: ...es Part No 695400004 is recommended O ring Care When removing checking or replacing O rings keep in mind the following NOTE Varian Vacuum Technologies recommends replacing all O rings during routine m...

Страница 21: ...by the high vacuum pump Service of the spectrometer tube requires that this vacuum be vented to the atmosphere CAUTION Do not use grease or other substance on O rings that will come in contact with t...

Страница 22: ...ils Rebuilt spectrometer tubes are available on an exchange basis NIST traceable calibrated leak testing and verification services Contacting Varian Vacuum Technologies In the United States you can co...

Страница 23: ...n is listed at the start of this book This information should be read before operating the equipment The 947 948 960 has rugged metal enclosures that are mounted on casters for greater mobility A key...

Страница 24: ...the turret and operational buttons identified in Figure 1 1 follow the figure Models 948 960 are shown in Figure 1 2 Figure 1 1 947 Leak Detector Turret Enclosure for Service Pendant and electronics...

Страница 25: ...60 provides access to the nitrogen cold trap Descriptions of the turret operational buttons and nitrogen trap identified in Figure 1 2 follow the figure Figure 1 2 948 960 Leak Detector Turret Enclosu...

Страница 26: ...2 Unpacking the 947 948 960 When receiving the 947 948 960 the following pieces are included Models 947 948 960 leak detector Service Pendant Power cable 115 VAC or 230 VAC Pump manuals for the purch...

Страница 27: ...handling The 947 948 960 is heavy and can cause personal injury if not handled carefully when removing it from the skid Method 1 1 With the assistance of a helper carefully roll the leak detector towa...

Страница 28: ...l Controls and Indicators The front panel controls and indicators are identified by number in Figure 1 3 Descriptions of each numbered item follow Figure 1 3 Figure 1 3 Front Panel Controls and Indica...

Страница 29: ...ates 0 0 and is on at all times 11 Leak Rate Over Indicator Goes on when the upper limits of the Leak Rate scale have been exceeded 12 Auto Man Mode Switch Selects automatic ranging or manual ranging...

Страница 30: ...he 947 948 960 Error codes and solutions The leak detector s standard leak setting as measured at the factory Figure 1 4 Turret Door Instruction Label 18 Auto Cal Button Press to initiate automatic ca...

Страница 31: ...e figure Figure 1 5 Rear Power Panel Rear panel power and circuit breakers Power Inlet 115 VAC or 230 VAC power connection see Power on page 1 11 Power Switch Circuit Breaker Mains power and Circuit b...

Страница 32: ...ret and connects to the 947 948 960 using a six foot cable that connects to an RS 232 serial port J1 a 9 pin D sub connector located inside the lockable turret The service pendant is used to monitor a...

Страница 33: ...0 leak detector against unidirectional transients caused by the following phenomena Switching phenomena in the power network e g switching of capacitor banks Faults in the power network Indirect light...

Страница 34: ...leak detector includes detailed instructions 1 7 4 Special Installation Requirements Additional services recommended for clean room use include Roughing foreline pump exhaust hose Vent to the outside...

Страница 35: ...nnection panel of the 947 948 960 Descriptions of the rear panel connectors follow the figure Figure 1 7 Rear Panel Interface Connectors The ports available on the rear panel for connection are J122 R...

Страница 36: ...Models 947 948 and 960 Leak Detectors Operations and Service Manual This page intentionally left blank...

Страница 37: ...8 960 into a production line or for use as automated equipment rather than stand alone equipment 2 1 Physical Considerations An integrated 947 948 960 has the same physical considerations as a manuall...

Страница 38: ...ers in black circles The key parts are identified below the figure The valve numbers are used in Table 2 1 The valve name and type are defined in the upper portion of the table the state of each valve...

Страница 39: ...ns are used in Table 2 1 Refer to Figure 2 2 on page 2 4 for valve locations V Vacuum S Solenoid O Open C Closed All valves are normally closed Table 2 1 Valve Operation Valve Name Rough Rough Valve O...

Страница 40: ...ignate the location of valves Other key parts of the vacuum system represented by numbers in black circles are identified after Figure 2 2 Figure 2 2 948 Flow Diagram Thermocouple Gauge TC2 Thermocoup...

Страница 41: ...represented by numbers in black circles are identified after Figure 2 3 Figure 2 3 960 Flow Diagram Reservoir Thermocouple Gauge TC1 Rough Valve Turbo Diffusion Pump Thermocouple TC2 Test Valve Forepu...

Страница 42: ...than reject set point 3 Stop 200 msec high pulse Unit goes to vent mode 4 Start 200 msec high pulse Goes to fine test via rough gross modes 6 Parallel Enable Active High Enables rear panel PLC Interfa...

Страница 43: ...ak Rate 5 LSD C Active High BCD Leak Rate 6 LSD D Active High BCD Leak Rate 7 MSD A Active High BCD Leak Rate 8 MSD B Active High BCD Leak Rate 9 MSD C Active High BCD Leak Rate 10 MSD D Active High B...

Страница 44: ...out the connection J123 connections are referenced to the chassis ground and are not isolated Electrical characteristics comply with EIA TIA Standard EIA TIA 232 E Table 2 4 J123 Pinout Summary Pin on...

Страница 45: ...he 947 948 960 Platform J123 female 25 pin connector Discrete I O port for PLC control J120 female 37 pin D connector Discrete BCD and analog leak rate output port for PLC control J121 female 25 pin D...

Страница 46: ...stem is assembled and tested Other parameters are changed when a gauge is changed or when the ion source or preamplifier is changed Some parameters are changed automatically during power up or when fu...

Страница 47: ...Opto isolated with the negative side of the inputs combined and tied to the return pins of the associated connector The input voltage range is 5 VDC to 24 VDC The maximum input current at 24 VDC drawn...

Страница 48: ...ient operation Once PARALLEL ENABLE is asserted operations can be monitored using the host serial port but most parameter values cannot be changed If a command is issued that is not allowed once PARAL...

Страница 49: ...obtain accurate readings Operate the 947 948 960 to obtain precision leak readings using helium Put the 947 948 960 in STANDBY mode and or shut it down entirely for maintenance or storage Parameter se...

Страница 50: ...Illuminates when the reject function is on and when the leak rate reading exceeds the selected set point Goes off when the leak rate falls below the set point HOLD Illuminates if the machine is in the...

Страница 51: ...erating Modes The parameters and operating modes work together to perform leak detection and the parameters that are entered determine the type of test and sensitivity of testing performed The discuss...

Страница 52: ...al port or optional discrete I O CALIBRATED LEAK VALUE The 947 948 960 is shipped from the factory with a calibrated leak Its value is noted on the turret of the leak detector and on the Cal Leak Cert...

Страница 53: ...INEAR VS LOG OUTPUT Configure the analog output voltage to the optional I O port on the back of the unit The options for output are linear or logarithmic at 2 VDC per decade or 3 VDC per decade AUTO S...

Страница 54: ...displayed and held at the analog output communications port until the next test cycle is initi ated This allows the end user to record the actual leak rate value for each test object ROUGH TIME The RO...

Страница 55: ...pressure with reduced sensitivity When TRANSFER TO FINE TEST is set to NO the leak detector does not transfer into FINE TEST mode This feature is useful for qualifying parts that have an unusually hi...

Страница 56: ...s appropriate to the unit under test Helium tank with spray gun or hook up for auto test Helium for the 948 960 Figure 3 2 shows the important 947 948 960 operation controls for start up and power For...

Страница 57: ...test pieces can be removed or attached to the detector Press and hold for 1 second to engage NOTE If the VENT button is pressed for less than one second the leak detector moves to HOLD Test Port The u...

Страница 58: ...rom thawing in the vacuum system The trap needs to be filled approximately every 14 hours Monitor the level and fill more often if necessary CAUTION If the cold trap in the 948 960 is allowed to empty...

Страница 59: ...s service c2 Rough pump is off Turn on the rough pump c4 No emission Select the other ion source filament Replace ion source if necessary Refer to Section 4 Maintenance on page 4 1 c5 Auto calibrate f...

Страница 60: ...s The TEST LED illuminates when test pressure drops The START LED goes off 1 second after TEST LED illuminates The Leak Rate range display goes to most sensitive range 6 Press the ZERO button The ZERO...

Страница 61: ...ent Calibration is complete when the AUTO CAL LED goes out 10 Recheck STD LEAK reading Steps 7 and 8 11 Press either the START or VENT button to continue operation following the AUTO CAL routine 3 5 O...

Страница 62: ...AN MODE switch in the Leak Rate Range section Figure 3 4 Location of AUTO MAN MODE Switch 3 Press the START button The VENT LED goes off and one second later the START LED illuminates The TEST LED ill...

Страница 63: ...the MAN position of the AUTO MAN MODE switch in the Leak Rate Range section 3 Press the SMALLER or LARGER button to select the exponent of the leak rate range to which you want to test 4 Securely atta...

Страница 64: ...ress the VENT button and hold it until the Vent LED comes on 2 Place the Rough pump power switch in the OFF position 3 Turn the Rough pump switch breaker to the ON position to return the Leak Detector...

Страница 65: ...any of the functions Refer to Section G Leak Detection Theory for information on turret connectors The service pendant is used to set up and monitor Reject set point Crossover pressures Auto sequence...

Страница 66: ...uto Zero functions See Section G Leak Detection Theory on page G 1 for details 3 9 Optional Discrete I O To use the optional discrete I O connections connect to J120 and J121 on the rear panel Refer t...

Страница 67: ...s Heed the following notes cautions and warnings when performing maintenance WARNING Disconnect power from the 947 948 960 before performing any maintenance procedure that requires physically disconne...

Страница 68: ...OTE Normally the use of vacuum grease is unnecessary If it must be used use it sparingly and avoid silicone types Apiezon L grease is recommended Varian P N 695400004 When removing checking or replaci...

Страница 69: ...eduled maintenance functions in this section are grouped by recommended frequency as shown in Table 4 1 based on assumed everyday use The 947 948 960 operates at its peak when maintenance preventive p...

Страница 70: ...page 4 31 TC1 gauge needs replacement as indicated by the fact that Test port pressure does not come down atmosphere indication when start button is pushed test mode assuming no leaks Test port pressu...

Страница 71: ...pecifications cannot be met Manual Tuning is required Manual Tuning is restricted to trained qualified customer technicians Contact Varian Vacuum Technologies Customer Service at 1 800 8VARIAN if manu...

Страница 72: ...checks are completed 2 If vent grooves exist at flanges or other assembled seals apply helium to these points rather than spraying a general area to Obtain the most positive response Minimize the use...

Страница 73: ...stated on its label Failure to check the leak could result in unreliable testing You can arrange for testing and re calibration at a lab of your choice Varian Vacuum Technologies provides NIST traceab...

Страница 74: ...r to Liquid Nitrogen Cold Trap Models 948 960 only on page 4 10 2 Remove the top panel of the 947 948 960 3 Vent the turbo by turning the knurled nut on the turbo pump turn clockwise and then close it...

Страница 75: ...he centering ring onto the calibrated leak 4 Insert the calibrated leak into the cavity orienting the leak so the value can be read easily NOTE To ensure reliable testing after servicing any part of t...

Страница 76: ...p to vent the trap 3 Don protective gear such as loose fitting gloves and eye or face shield and remove the cold trap WARNING Liquid nitrogen causes burns upon contact 4 Clean the trap with soap and w...

Страница 77: ...s 948 960 only on page 4 10 for the procedure to empty the Cold Trap steps 1 2 and 3 Do not refill the Cold Trap until service is complete There are three basic sub assemblies in the spectrometer tube...

Страница 78: ...960 only on page 4 10 for the procedure to empty the Cold Trap steps 1 2 and 3 Do not refill the Cold Trap until service is complete To remove the spectrometer tube 1 Insert the plug in the test port...

Страница 79: ...must be pushed to unlock the connector then pull the connector to the right to remove it Figure 4 2 947 948 960 Spectrometer Tube Removal 7 Hold the spectrometer tube and loosen the wing nut holding t...

Страница 80: ...r tube body 6 Firmly but gently separate the flange cap from the ion source 7 Remove both the O ring on the ion source and the ion source 8 Remove the ground slit plate from the ion source cavity with...

Страница 81: ...Ion Source and especially before smoking or eating CAUTION Do not use methanol or other solvents on O rings To do so causes deterioration and reduces their ability to hold a vacuum Do not clean any a...

Страница 82: ...collector housing assembly with the ends of the seal crossed under one of the screw holes Figure 4 4 View A 2 Mount the collector housing assembly to the spectrometer tube body with the four socket h...

Страница 83: ...prongs are facing up then align the slit at 90 with the side wall of the spectrometer tube and concentrically align the circular hole in the plate with the smaller guide hole in the bottom of the ion...

Страница 84: ...m which it was removed replace and tighten the four screws that fit into the magnet assembly 12 Insert the pole pieces and the black plastic knobs making sure that the pole pieces are snug against the...

Страница 85: ...refill the Cold Trap until service is complete To reinstall the spectrometer tube 1 Place the cleaned new ungreased centering ring and O ring on the vacuum flange of the spectrometer tube 2 Hold the s...

Страница 86: ...removal of the front lower panel exposes the air filter as shown in Figure 4 8 When buildup of dirt dust or other contaminants is apparent replace the filter with a commercial filter size 16 x 20 x 1...

Страница 87: ...8 960 for testing CAUTION Use powder free butyl or polycarbonate gloves to prevent skin oils from getting on vacuum surfaces The preamplifier is a static sensitive device Wear a grounding device while...

Страница 88: ...of the vacuum system the 947 948 960 must be leak checked again Refer to Leak Checking on page 4 5 for guidelines 5 Replace the front panel and connect mains power 6 Turn the leak detector on and wait...

Страница 89: ...ock to replace the TC1 thermocouple gauge To replace the TC1 gauge in the Main Valve Block Assembly MVBA 1 Press the VENT button on the front panel to vent the leak detector 2 Disconnect the mains pow...

Страница 90: ...ny dirt or foreign matter from the backing ring otherwise wipe it with a lint free cloth 9 Place the backing ring and then the O ring onto the end of the new thermocouple gauge and move them down towa...

Страница 91: ...until service is complete Figure 4 11 shows the valve block removed from the system To replace the TC2 gauge in the Service Block Assembly SBA 1 Press the VENT button on the front panel to vent the l...

Страница 92: ...and tighten it fully 11 Place the O ring onto the centering ring and onto the flange of the SBA 12 Place the adapter against the center ring 13 Replace the KF25 clamp and tighten the wing nut fully 14...

Страница 93: ...To perform this procedure 1 Verify that the leak detector is in the READY condition the NOT READY LED is not illuminated and that the test port plug is in place 2 If the system is not already in VENT...

Страница 94: ...960 3 Wait for the system NOT READY LED to illuminate 4 Open the turbo vent screw located on the side of the turbo pump housing 5 On the Service Pendant press shift and the SY TC ATM key The Pendant s...

Страница 95: ...s the VENT button and verify that the VENT LED is illuminated 3 Remove the plug from the test port and place a T Manifold 1 1 8 inches 28 mm OD into the test port 4 Attach a Tuning Leak Varian P N K16...

Страница 96: ...fully Remove the PC and connect the Service Pendant Perform the next part of the calibration procedure Atmospheric Calibration 4 2 7 7 Atmospheric Calibration To perform atmospheric calibration 1 If t...

Страница 97: ...h pump and Forepump are equipped with an oil level sight glass that can be viewed when the front lower panel cover is removed Figure 4 12 Refer to your pump manual for the proper oil level If it is lo...

Страница 98: ...ng the leak detector be sure to turn the leak detector off disconnect it from mains power and for Models 948 960 remove and empty the cold trap 4 2 9 1 Removing the Test Port CAUTION If cleaning the t...

Страница 99: ...nance procedure requiring that O rings be removed 3 Before re using O rings or installing new O rings wipe them down with a lint free cloth before installation to ensure that no foreign matter is pres...

Страница 100: ...tight enough to stay in place 4 Place the test port plug into the test port tightening nut making sure it is completely seated 5 Tighten the test port tightening nut completely 4 3 Spare Parts Spare...

Страница 101: ...s Part Part Number Where Used Spectrometer Tube Assembly K9735301 947 948 960 Service Block piece part R0028001 947 948 960 Main Block piece part K9614301 947 948 960 Gross Leak Assembly R1498301 947...

Страница 102: ...Models 947 948 and 960 Leak Detectors Operations and Service Manual This page intentionally left blank...

Страница 103: ...s error conditions as listed in Figure 5 1 on page 5 2 on the Leak Rate Exponent display item 9 in Figure 1 3 on page 1 6 To begin Verify that the leak detector is plugged into an appropriately powere...

Страница 104: ...n page 4 1 Replace ion source if necessary c5 Auto calibrate function is out of range Leak detector requires maintenance Notify Varian Vacuum Technologies Customer Service c6 Auto tune function is out...

Страница 105: ...ead correctly high test port pressure reading Clean TC gauge If problem persists replace TC gauge Models 948 960 only Excessive moisture in the cold trap Dry out the cold trap A warm up period is nece...

Страница 106: ...manifold or vacuum lines are leaking Check for leaks Pump drain plugs are loose Tighten the drain plugs Turbo pump not running No power Check the outlets power switch and circuit breakers Leaks Tight...

Страница 107: ...1 Keypad Functions Figure A 1 shows the service pendant keypad Glossary of Function Keys on page A 3 explains the keys that perform special functions when entering information Glossary of Input and Da...

Страница 108: ...ect set point value and see if it is enabled on or off Press 1 the number of the reject set point you want to display i e 1 though 4 Press The currently enabled set point is displayed along with its v...

Страница 109: ...nters the E for exponential notation inputs such as reject set point SHIFT LK RATE E Displays the current leak rate _ Enters a decimal point for input values such as in rangestop SHIFT _ Enters a minu...

Страница 110: ...ecade Log format SET GR XFR SHOW Displays the value of the Gross Leak Transfer Point SHIFT SET GR XFR SHOW Sets the value of the Gross Leak Transfer Point Enter X XE X the desired value followed by SH...

Страница 111: ...n key INIT RPLR PUT Sets a temporary new value for Repeller Voltage Enter XXX the desired value then the function key SHIFT INIT RPLR PUT Sets a permanent new value for Repeller Voltage Enter XXX the...

Страница 112: ...PUT Sets a permanent new value for System Gain Enter X X the desired value followed by the SHIFT key then the function key INIT EMIS PUT Sets a temporary new value for Emission Current Enter XXXX the...

Страница 113: ...cer function SHIFT ON A SEQ OFF Turns on the Auto Sequencer function 2 FIL SEL 1 Selects filament 1 in the Ion Source SHIFT 2 FIL SEL 1 Selects filament 2 in the Ion Source OUT V SHOW FIL Displays the...

Страница 114: ...1 Enter X XE X the desired value then the function key SHIFT REJ3 SET REJ 1 Sets the leak rate value for Reject Set Point 3 Enter X XE X the desired value followed by the SHIFT key then the function...

Страница 115: ...or service heed the following WARNING Disconnect power from the 947 948 960 before performing any maintenance procedure that requires physically disconnecting any part of the system CAUTION Models 948...

Страница 116: ...helf 1 Loosen the screws of the service pendant serial connection and remove the connection Figure B 1 NOTE The service pendant power cable is still attached to the electronics housed beneath the pend...

Страница 117: ...endant shelf using the procedure described in Removing the Service Pendant Shelf on page B 2 3 Remove the 3 8 nuts located under the front corners of the frame of the chassis Figure B 2 Figure B 2 The...

Страница 118: ...placing the Service Pendant Shelf To replace the service pendant shelf 1 Place the shelf into the turret guiding the power wire through the area beside the shelf near the serial connection 2 Replace t...

Страница 119: ...ace the top cover onto the frame fitting it around the front of the chassis the start and stop button panel the test port and the upper back of the turret 2 Working at the rear of the leak detector pl...

Страница 120: ...tment procedures WARNING Store the Ion Source in a cool dry area in a tightly sealed container Wash hands thoroughly after handling the Ion Source and especially before smoking or eating CAUTION Use p...

Страница 121: ...in accordance with local regulations or return it to Varian Vacuum Technologies for exchange 6 Remove the ground slit plate by placing a thin slotted screwdriver into the slot and carefully twisting a...

Страница 122: ...ove he ground slit plate and using a screwdriver bend the prongs out slightly Then place it into the cavity again CAUTION A short could result at power up if the alignment pin touches the sides of the...

Страница 123: ...mp and two mechanical pumps a forepump and a rough pump B 3 1 Turbo Pump The turbo pump Figure B 6 is located in the middle front of the main cabinet You must remove connections to the valve block spe...

Страница 124: ...ing any part of the system CAUTION Models 948 960 only Remove empty and clean the cold trap whenever power is removed Refer to Liquid Nitrogen Cold Trap Models 948 960 only on page 4 10 2 Remove the s...

Страница 125: ...o pink connectors labeled 1 and 2 If the connections are not fully labeled label them now Figure B 8 Figure B 8 The Turbo Power Connection 5 Loosen the radiator clamp screw and remove the fan from the...

Страница 126: ...ine connection Figure B 7 on page B 10 Remove the foreline centering ring and O ring and place them on a clean surface 9 Remove the turbo pump 10 Remove the ISO50 centering ring and O ring and place t...

Страница 127: ...edure 1 Place the O ring on the ISO50 centering ring 2 Place the centering ring against the top of the turbo pump 3 Hold the turbo pump against the SVBA oriented so that the flange for the foreline co...

Страница 128: ...t connected already 12 Place the turbo fan assembly against the turbo pump oriented so that the fan is on the front of the pump with the guard facing outward 13 Place the radiator clamp around the tur...

Страница 129: ...ide of the main cabinet Figure B 10 shows the front view of wet and dry pump configurations WARNING To avoid injury use proper lifting techniques when moving pumps Your system may have pumps that requ...

Страница 130: ...Remove the right side panel 4 Disconnect the pump power plug from the 947 948 960 5 Drain the oil according to the pump manual instructions 6 If you are replacing the pump as part of a Varian exchang...

Страница 131: ...the bolts that connect the pump to the bottom of the main cabinet Figure B 10 on page B 15 NOTE You may have to loosen the radiator clamps on the tygon tubing and slide it up the line to remove the pu...

Страница 132: ...abinet aligning the holes in the pump over the mounting holes in the floor of the cabinet 3 Working from beneath the cabinet place the bolts into the mounting holes replace the nuts but do not tighten...

Страница 133: ...rmed before closing the panels or powering up the pump CAUTION To ensure reliable testing after servicing any part of the vacuum system the 947 948 960 must be leak checked again Refer to Leak Checkin...

Страница 134: ...have pumps that require two people to move them safely 2 Remove the front panel 3 Remove the right side panel 4 Disconnect the power plug of the pump from the 947 948 960 The plug is located behind t...

Страница 135: ...10 on page B 15 placing the mounting bolts into the holes in the floor of the cabinet 3 Place the centering ring and O ring against the pump outlet on the left side of the pump 4 Place the manifold ag...

Страница 136: ...947 948 960 using the procedure described in Re calibrate the Internal Calibrated Leak on page 4 7 18 Leak check the assembly before using the 947 948 960 for testing B 5 Replacing the Forepump B 5 1...

Страница 137: ...left side panel 4 Unplug the power plug of the pump from the 947 948 960 5 Drain the oil following the instruction included in the pump manual 6 Remove the NW25 clamp from the left manifold 7 Remove t...

Страница 138: ...n moving pumps Your system may have pumps that require two people to move them safely To perform this procedure 1 Ensure the area is clean for the new pump 2 Place the new pump in the 947 948 960 orie...

Страница 139: ...ing after servicing any part of the vacuum system the 947 948 960 must be leak checked again Refer to Leak Checking on page 4 5 for guidelines 15 Replace the front panel 16 Replace the side panel 17 R...

Страница 140: ...ap Models 948 960 only on page 4 10 WARNING To avoid injury use proper lifting techniques when moving pumps Your system may have pumps that require two people to move them safely 2 Remove the front pa...

Страница 141: ...2 Remove the centering ring and O ring and place them on a clean surface B 5 2 1 4 Removing the Pump from the Cabinet To perform this procedure 1 Working from beneath the main cabinet remove the four...

Страница 142: ...outlet on the left side of the pump 4 Place the manifold against the centering ring If necessary shift the pump so that the connection is clean and there is no strain on the manifold 5 Place the NW25...

Страница 143: ...reliable testing after servicing any part of the vacuum system the 947 948 960 must be leak checked again Refer to Leak Checking on page 4 5 for guidelines 3 Replace the front panel 4 Replace the side...

Страница 144: ...Models 947 948 and 960 Leak Detectors Operations and Service Manual This page intentionally left blank...

Страница 145: ...nds for the controlling device to set the current state or value of a volatile leak detector parameter Words that begin with INIT are commands for the controlling device to set non volatile leak detec...

Страница 146: ...tage REPELLER 402 2 Reports the repeller voltage FIXEDFOCUS 212 7 Reports the fixed focus voltage SUPPRESSOR 145 0 Reports the suppressor voltage EMISSIONCURRENT 1 040Reports the emission current OFFS...

Страница 147: ...ond line Consists of the words system TC followed by a number of mTorr RANGESTOP A string of three characters that tells the most sensitive range exponent when the auto range function is operating REJ...

Страница 148: ...ting of a two digit calibration standard leak rate mantissa with a decimal point after the first digit followed by E then by a two digit number which is the calibration standard leak rate range expone...

Страница 149: ...NIT FL XFER Sets the minimum pressure in Torr that must be attained to transfer from gross leak to fine leak test A seven character string two mantissa digits with a decimal point between them E and a...

Страница 150: ...a decimal point after the first digit E and a single digit which is the leak rate range exponent Values outside the working range of the leak detector are not stored INIT TEST A one to three digit nu...

Страница 151: ...EP Causes the leak detector to close most valves and enter the HOLD state No parameters ROUGH Causes the leak detector to begin a roughing and testing sequence No parameters SYTCATM Sets the current s...

Страница 152: ...Models 947 948 and 960 Leak Detectors Operations and Service Manual This page intentionally left blank...

Страница 153: ...Interface J120 The discrete I O DB37 connector is used to control operations via a PLC Table D 2 provides details about this connection Table D 1 Service Serial Interface J1 Pin Signal Name Descriptio...

Страница 154: ...Range Active High Automatically changes the exponent to keep the reading in range Input 14 Hold Not used Input 15 Filament Fault Active High Active when the selected ion source filament is non functio...

Страница 155: ...ate Update Pulse Output Leak rate is updated on falling edge and is stable as long as output is low Output Mantissa 3 LSD A Active High BCD Leak Rate Output 4 LSD B Active High BCD Leak Rate Output 5...

Страница 156: ...Table D 5 provides details about this connection Table D 4 Optional Interface J122 for Optional Universal Remote Control Pin Name Signal Description Output Input Level 1 Shield System Ground 2 DATA IN...

Страница 157: ...Flow Contra Flow with Cold Trap Cold Trap Capacity N A Liquid nitrogen hold for 14 hours after vacuum system cool down Helium Sensitivity atm cc sec 2 x 10 10 2 x 10 9 2 x 10 10 2 x 10 9 Response Tim...

Страница 158: ...service pendant atmospheric gross leak external calibrated helium Leaks Recommended Ambient Operating Conditions Indoor use Altitude up to 2000 m Temperature 10 C to 38 C 50 F to 100 F Maximum relati...

Страница 159: ...0300M220 V70D DS 302 DS 202 947 MacroTorr LD L94720450M120 L94720450M220 V70D DS 402 DS 202 947D Turbo Dry LD D94735350T120 D94735350T220 V70 TriScroll 300 TriScroll 300 947D Turbo Dry LD D94735550T12...

Страница 160: ...96009300T120 L96009300T220 V70 SD 301 SD 91 D96035350T120 D96035350T220 V70 TriScroll 300 TriScroll 300 and V70D D96035550T120 D96035550T220 V70 TriScroll 600 TriScroll 600 and V70D Table E 2 947 948...

Страница 161: ...all Varian Vacuum Technologies for further information at 1 800 8VARIAN Factory installed option Table F 1 947 948 960 Accessories Part Number Option L9558301 Universal remote control display unit wit...

Страница 162: ...Models 947 948 and 960 Leak Detectors Operations and Service Manual This page intentionally left blank...

Страница 163: ...Detection There are four general classes of leak detection Hermetic Enclosures or parts thereof These are tested to prevent entrance of contaminants or loss of fluid that would affect performance of t...

Страница 164: ...flow rate should be expressed in torr liters second Conversions 1 std cc sec 0 76 torr liter sec 1 torr liter sec 1 3 std cc sec 1 std cc sec 9 7 x 104 micron cubic feet per hour or practically 105 mi...

Страница 165: ...3 atm cc sec It tests for ultrasonic sounds coming from a gas leak and for testing high pressure lines Halogen sensitive to halogen elements or compounds especially refrigerant gases This method is go...

Страница 166: ...d The resulting current is amplified and a leak rate bar graph indicates the presence and amount of helium G 5 2 Application as a Leak Detector A mass spectrometer leak detector consists of a spectrom...

Страница 167: ...cc sec per square centimeter of surface area Variation in Leak Sizes Leaks unintentionally built in at joints during manufacture can vary from hour to hour and day to day Breathing on a 10 6 std cc s...

Страница 168: ...then probed with a small jet of helium to locate individual leaks or surrounded by helium hooded for an overall leak check Figure G 1 Test Piece Evacuated Tracer Probe Used to Locate Leak Figure G 2 T...

Страница 169: ...4 Test Piece Sealed with Helium and or Other Gases Bell Jar Used to DetermIne Overall Leak Rate Sometimes it is necessary to leak check a completely sealed object This can be done by placing helium i...

Страница 170: ...ector which neutralizes the current produced by the collection of helium ions The feedback current is presented on the leak rate bar graph Since this current is directly proportional to the number of...

Страница 171: ...D Daily maintenance 4 5 Decimal notation table G 2 Diagnostics using the service pendant 3 16 Discrete I O option 2 9 3 16 J120 inputs 2 5 Parallel enable 2 11 Parallel interface D 1 Dual mechanical...

Страница 172: ...urized G 6 Leak detector maintenance 4 1 Leak detector storage 1 13 Leak rate 3 5 G 5 G 6 Leak test methods G 3 Dye penetrant G 3 Halogen G 3 Helium G 3 Radioisotope G 3 Ultrasonic G 3 Water immersion...

Страница 173: ...0 Operation description 947 1 2 Operation description 948 1 3 Optional interface Electronic communications 2 5 O rings 4 2 4 13 4 15 4 18 4 20 B 8 P Parallel enable 2 11 3 16 Parameter setup 3 3 3 16...

Страница 174: ...s and parts for overhaul 4 11 Spectrometer tube exchange 4 22 Standard leak test valve indicator 3 2 Standby mode 3 15 Start button indicator 3 2 Start up controls 3 8 Start up procedure 3 10 Storage...

Страница 175: ......

Страница 176: ...House 7 Nangal Raya Business Centre New Delhi 110 046 India Tel 91 11 5548444 Fax 91 11 5548445 Italy Varian Vacuum Technologies Via F lli Varian 54 10040 Leini Torino Italy Tel 39 011 997 9 111 Fax...

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