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Trace Nitrogen in Argon Analyzer 

Operational Theory 

 

 

 

Teledyne Analytical Instruments 

15 

CAUTION: 

IT IS THE RESPONSIBILITY OF THE END USER TO 
PROVIDE A SUITABLE SAMPLE SYSTEM CAPABLE OF 
DELIVERING CLEAN, PARTICULATE-FREE ARGON 
THAT IS AIR AND MOISTURE FREE. 

EQUIPMENT DAMAGE MAY RESULT IF THE 
ANALYTICAL CELL IN THIS UNIT IS EXPOSED TO 
PRESSURE, CAUSING IT TO BREAK OR SHATTER. 
TO PREVENT THIS, NEVER EXCEED 20 PSIG (138 
KPA) ON THE INPUT PORT AND ALWAYS MAINTAIN 
THE VENT AT ATMOSPHERIC PRESSURE. 

DO NOT BLOCK THE VENT. 

The external sample system should be capable of supplying clean, 

particulate-free and moisture-free sample gas that is also free of air and 
moisture. If air or moisture is ionized in the analytical cell, ozone 
emissions are possible. These same conditions apply to any calibration 
gases used.  

Section 3.6.1 provides more information on a suitable sample 

system.  

If air enters the sample system, it can be removed by purging the 

sample lines. Recalibration is not necessary.   

 
 

 

Содержание 2120XL

Страница 1: ... only Do not introduce any flammable or toxic gases into this instrument Hazardous voltages exist on certain components internally which may be lethal Disconnect power before servicing Only authorized personnel should conduct maintenance and or servicing Before conducting any maintenance or servicing consult with authorized supervisor manager P N M84744 10 01 14 ...

Страница 2: ... of any parts in so far as such alterations do not adversely affect our warranty Important Notice This instrument provides measurement readings to its user and serves as a tool by which valuable data can be gathered The information provided by the instrument may assist the user in eliminating potential hazards caused by his process however it is essential that all personnel involved in the use of ...

Страница 3: ... in argon or a mixture specified at the time of purchase Specific filters carefully chosen and tested at the factory have been installed for the particular gas mixture Using this instrument to analyze any other gas mixture will result in serious error Consult the factory for additional information for gas analysis not specified at the time of purchase Instrument Serial Number _____________________...

Страница 4: ...edures which if not followed could cause bodily Injury and or damage the instrument CAUTION HOT SURFACE WARNING This warning is specific to heated components within the instrument Failure to heed the warning could result in serious burns to skin and underlying tissue WARNING ELECTRICAL SHOCK HAZARD Dangerous voltages appear within this instrument This warning is specific to an electrical hazard ex...

Страница 5: ...nd maintenance of your new analyzer Please read this manual and keep it available Occasionally some instruments are customized for a particular application or features and or options added per customer requests Please check the front of this manual for any additional information in the form of an Addendum which discusses specific information procedures cautions and warnings that may be peculiar to...

Страница 6: ...itional Safety Information 7 1 7 1 Detector Cautions 8 1 7 2 Basic Safety Requirements 9 1 7 3 Precautionary Labels 9 1 7 4 Summary of Known Hazards 10 1 7 4 1 Electrocution 10 1 7 4 2 Pressure 10 1 7 4 3 Purging 11 1 7 4 4 Safe Repair Procedures 11 1 7 4 5 General Precautions for Handling and Storing High Pressure Gas Cylinders 11 Operational Theory 13 2 1 The Analyzer 13 2 2 Sample System 14 Ins...

Страница 7: ...3 9 Installation Checklist 33 Operation 35 4 1 Powering Up the Analyzer 36 4 2 Zero and Span Calibration 36 4 3 Setup and Operation General Information 37 4 4 Using the Data Entry and Function Buttons 37 4 5 Analyzer Functions 38 4 5 1 System Menu 39 4 5 1 1 Digital Filter 40 4 5 1 2 Self Test 41 4 5 1 3 Password Protection 42 4 5 1 4 Logout 46 4 5 1 5 ERR 46 4 5 1 6 Auto Calibration Auto Cal 47 4...

Страница 8: ...bration 57 4 5 3 The Range Function 59 4 5 4 The Alarms Function 60 4 6 The Analyze Function 62 4 7 Signal Output 62 Maintenance 65 5 1 Routine Maintenance 65 5 2 Routine Maintenance Schedule 65 5 3 Fuse Replacement 66 5 4 System Self Diagnostic Test 67 5 5 Error Screens 68 5 6 Sensor Replacement 69 Appendix 71 A 1 Specifications 71 A 2 Recommended Replacement Parts List 72 A 3 Drawing List 73 ...

Страница 9: ...tion 7 Figure 3 1 Required Front Door Clearance 19 Figure 3 2 Rear Panel of the Model 2120XL 19 Figure 3 3 Equipment Interface Connector Pin Arrangement 21 Figure 3 4 Remote Valve Connections 25 Figure 3 5 FET Series Resistance 26 Figure 3 6 Suggested Sample System 29 Figure 4 1 Hierarchy of Functions and Sub Functions 39 Figure 5 1 Removing Fuse Block from Housing 66 Figure 5 2 Installing Fuses 6...

Страница 10: ... 1 Analog Output Connections 21 Table 3 2 Alarm Relay Contact Pins 22 Table 3 3 Remote Calibration Connections 23 Table 3 4 Range ID Relay Connections 24 Table 3 5 Commands via RS 232 Input 26 Table 3 6 Required RS 232 Options 27 Table 5 1 Routine Maintenance Schedule 66 ...

Страница 11: ...ious injury read all precautionary labels attached to equipment cylinders containers and boxes prior to start up Labels attached in appropriate areas of the analyzer warn you of inherent hazards associated with the system For personal safety read the labels and perform directed precautions before handling the equipment The customer should ensure that the principles of operating this equipment are ...

Страница 12: ...Model 2120XL Teledyne Analytical Instruments xii ...

Страница 13: ... programmable analysis ranges extending from 0 1 ppm to 0 100 ppm with corresponding analog output signals that are proportional to the concentration on the selected range The nitrogen concentration is displayed on the front panel and the analog output signals are available at the rear panel Digital communication is achieved with a standard RS 232 serial port The system is easy to operate with all...

Страница 14: ...nced high frequency plasma generator produces stable electroluminescent discharge with minimal heating yielding a spectral emission characteristic of the gas mixture Custom low noise optical filter for precise narrow band selection and low optical interference Amplified optics circuit for stable nitrogen detection at low ppb level Microprocessor based electronics 8 bit CMOS microprocessor with 32 ...

Страница 15: ...ange identification Convenient and versatile steel flush panel or rack mountable case with slide out electronics drawer 1 4 Front Panel Operator controls and displays are located on the front panel as shown in Figure 1 1 Figure 1 1 Model 2120XL Front Panel The standard 2120XL Nitrogen in Argon Analyzer is panel mounted designed for easy installation in a standard 19 instrument rack All user contro...

Страница 16: ... functions currently displayed on the VFD screen Increment or decrement values of functions currently displayed Enter Advances VFD display to the next screen in a series or returns to the Analyze screen if none remain Escape Backs VFD display to the previous screen in a series or returns to the Analyze screen if none remain also used to abort an entry Digital Meter Display The meter display is a L...

Страница 17: ... all the way in with a narrow gauge tool Accessing the main circuit board requires unfastening rear panel screws and sliding the unit out of the case 1 5 Rear Panel The rear panel shown in Figure 1 2 contains the gas and electrical connectors for external inlets and outlets Some of those depicted are optional and may not appear on your instrument The connectors are described briefly here and in de...

Страница 18: ...igh Cal not used RS 232 Port Serial digital concentration signal output and control input Gas Inlet and Outlet One inlet and one vent Purge Connections Inlet and outlet connections for purging the analyzer Instrument Air Used for driving optional auto calibration valves Figure 1 2 Model 2120XL Rear Panel 1 6 Internal Components The internal components can be accessed by removing the top cover of t...

Страница 19: ...OVING THE COVER THE OUTPUT OF THE HIGH VOLTAGE TRANSFORMER AND THE ANALYTICAL CELL ELECTRODES CAN APPROACH VOLTAGES OF 10 000 VAC THE ANALYZER SHOULD BE SERVICED ONLY BY A QUALIFIED SERVICE TECHNICIAN 1 7 Additional Safety Information Note The material provided in this section contains information to promote safety in the operation and maintenance of this equipment It is not intended to supersede ...

Страница 20: ...r facility various gases may exist in liquid and or gaseous states Familiarize yourself with the hazards associated with each gas found at your facility Read and understand the Material Safety Data Sheets MSDS for the materials used with this equipment All personnel who work in the vicinity of this equipment should read understand and follow all safety information contained in the MSDSs in additio...

Страница 21: ...ts used during installation and maintenance are in good condition Be aware that high velocity gas may be released at vents and safety relief valves Follow posted precautions Read all precautionary labels attached to the equipment Be sure to read all cylinder labels and warnings Comply with all precautions before handling the equipment Situations may develop for which no written procedures exist Th...

Страница 22: ...nce to the following guidelines helps guard against electrical shock For safety and proper performance this analyzer must be connected to a properly grounded three wire source of electrical power Tampering or unauthorized substitution of components may adversely affect the safety of this instrument Use only factory approved components for repair Before checking or replacing any chassis component t...

Страница 23: ...t atmosphere is not created in the work area Use low parts per million ppm nitrogen in argon gas with proper regulation to avoid contaminating the sampling system 1 7 4 4 SAFE REPAIR PROCEDURES Any repair work must be performed by a qualified service technician Use only factory approved components for repair Analyzer manifold purging as well as subsequent repair work must be performed by experienc...

Страница 24: ...re reducing regulators and pressure relief devices to prevent over pressurizing of tubing and equipment 6 Never drop cylinders or permit them to strike each other violently 7 Cylinders may be stored in the open but in such cases should be protected against extremes of weather and from damp ground to prevent rusting in areas where extreme temperatures are prevalent store cylinders in the shade 8 Th...

Страница 25: ... line energy is identified for nitrogen and a custom blocking filter is selectively chosen and installed at the factory which is tuned to remove all but the narrow energy associated with the nitrogen emission peak The light energy passing through the filter is focused on a photon detector also tuned to respond to that wavelength This instrument can only be used for analyzing nitrogen in argon The ...

Страница 26: ... designed to reduce interference The desired spectral line used for analysis is sharp and focused on the detector The detector lifetime is enhanced using a Duty Cycle Controlled System by reducing the coating inside the cell This also results in an increase in sensitivity 2 2 Sample System A suitable external sample system must be provided by the customer The external sample system delivers calibr...

Страница 27: ... NEVER EXCEED 20 PSIG 138 KPA ON THE INPUT PORT AND ALWAYS MAINTAIN THE VENT AT ATMOSPHERIC PRESSURE DO NOT BLOCK THE VENT The external sample system should be capable of supplying clean particulate free and moisture free sample gas that is also free of air and moisture If air or moisture is ionized in the analytical cell ozone emissions are possible These same conditions apply to any calibration ...

Страница 28: ...Operational Theory Model 2120XL Teledyne Analytical Instruments 16 ...

Страница 29: ...urging Calibration 3 1 Unpacking the Instrument The analyzer is shipped with all the materials you need to install and prepare the system for operation Carefully remove the analyzer from the shipping container and visually inspect it for damage Maintain it in an upright position and avoid jarring Ensure the power cord and calibration data sheets are included and that all components ordered have be...

Страница 30: ...GNED FOR USE IN A GENERAL PURPOSE AREA AND IS NOT RATED FOR USE IN HAZARDOUS AREAS 3 3 Mounting The Model 2120XL is a rack mountable unit intended for indoor use only Space and materials required for mounting are 8 3 4 inches 22 2 cm of 19 inch rack space Service access space behind and in front of the analyzer Four mounting screws suited to the rack All operator controls are mounted on the contro...

Страница 31: ...inlet and outlet ports are installed depending on whether the unit is supplied with an optional auto calibration module In addition the rear panel has provisions for power communication and a user interface connector that incorporates alarm analog output digital input output and relay connections that are used in interfacing peripheral equipment with the analyzer Figure 3 2 Rear Panel of the Model...

Страница 32: ...wer cord receptacle CAUTION POWER IS APPLIED TO THE INSTRUMENT S CIRCUITRY AS LONG AS THE INSTRUMENT IS CONNECTED TO THE POWER SOURCE THESTANDBY SWITCH ON THE FRONT PANEL IS FOR SWITCHING POWER ON OR OFF TO THE DISPLAYS AND OUTPUTS ONLY The universal power supply requires an 85 250 VAC 47 63 Hz power source Fuse Installation The fuse block at the right of the power cord receptacle accepts US or Eu...

Страница 33: ...ble range 0 1 VDC Range ID 0 25 V Low Range 0 5 V Medium Range 0 75 V High Range 1 V 100ppm 4 20 mA DC Range Current increases linearly with increasing nitrogen from 4 mA at 0 ppm to 20 mA at full scale ppm Full scale 100 of programmable range 4 20 mA dc Range ID 8 mA Low Range 12 mA Medium Range 16 mA High Range 20 mA 100ppm Table 3 1 Analog Output Connections Pin Function 3 Range ID 4 20 mA floa...

Страница 34: ... be configured as failsafe or non failsafe Can be configured as latching or non latching Can be configured out defeated Threshold Alarm 2 Can be configured as high actuates when concentration is above threshold or low actuates when concentration is below threshold Can be configured as failsafe or non failsafe Can be configured as latching or non latching Can be configured out defeated Table 3 2 Al...

Страница 35: ...ts the analyzer into the Span mode Either side may be grounded at the source of the signal 0 to 1 volt across the terminals allows Span mode to terminate when done A synchronous signal must open and close external span valve appropriately See Figure 3 4 Remote Valve Connections Cal Contact This relay contact is closed while analyzer is spanning and or zeroing See Remote Calibration Protocol below ...

Страница 36: ... CRC closes remove the span command When CRC opens again zero and span are done and the sample is being analyzed Note The Remote Valve connections described below provides signals to ensure that the zero and span gas valves will be controlled synchronously If you have the Auto Caibration Option it includes additional zero and span gas inputs the 2120XL automatically regulates the zero span and sam...

Страница 37: ...thod for directly controlling external sample zero span gas valves See Figure 3 4 Figure 3 4 Remote Valve Connections The voltage from these outputs is nominally 0 V for the OFF and 15 VDC for the ON conditions The maximum combined current that can be pulled from these output lines is 100 mA If two lines are ON at the same time each must be limited to 50 mA etc If more current and or a different v...

Страница 38: ... information in digital form updated every two seconds Status is reported in the following order The concentration in ppm or percent The range in use HI MED LO The span of the range 0 100 ppm etc Which alarms if any are disabled AL x DISABLED Which alarms if any are tripped AL x ON Each status output is followed by a carriage return and line feed Three input functions using RS 232 have been implem...

Страница 39: ...8 bits Parity none Stop Bits 1 Message Interval 2 seconds When CRC opens again zero and span are done and the sample is being analyzed 3 6 Gas Connections CAUTION THIS INSTRUMENT IS NOT DESIGNED TO HANDLE HAZARDOUS GASES OZONE EMISSIONS CAN OCCUR IF AIR OR MOISTURE ARE IONIZED IN THE SAMPLING SYSTEM THE SAMPLE PATH MUST BE RELATIVELY FREE OF AIR AND OR MOISTURE BEFORE APPLYING THE IONIZING VOLTAGE...

Страница 40: ...ns include Sample Gas In Exhaust Gas Out Vent Instrument Air optional calibration valves Purge Gas optional calibration valves Span Gas In optional calibration valves Zero Gas In optional calibration valves CAUTION EQUIPMENT DAMAGE MAY RESULT IF THE ANALYTICAL CELL IN THIS UNIT IS EXPOSED TO PRESSURE CAUSING IT TO BREAK OR SHATTER TO PREVENT THIS NEVER EXCEED 20 PSIG 138 KPA ON THE INLET PORT AND ...

Страница 41: ...is instrument is without the auto calibration option there will be no rear panel fittings for zero and span gases The customer must install a suitable valve switching manifold or tee the calibration gases with valves into the sample in line 3 6 1 Typical Sample System A suggested sample system is shown in Figure 3 6 This system allows you to switch the analyzer between zero or span calibration gas...

Страница 42: ... adhered to schematically Use 1 8 inch 0 32 cm electro polished stainless steel tubing for all parts of the manifold between the source and sample inlet connections of the analyzer Although you can use 1 4 inch 0 64 cm tubing it is not recommended The manifold should be a welded assembly wherever possible Use only high purity components with metal seals Eliminate excess components Minimize dead sp...

Страница 43: ...t on the rear of the analyzer 2 Connect the inlet line from the sample manifold system regulated to 4 to 20 psig 41 kPa to the 1 8 in Input port fitting on the rear of the analyzer 3 7 Purging The Model 2120XL is equipped with a flow control module installed in the analyzer sample inlet to regulate flow and pressure to the analytical cell A maximum inlet pressure of 20 psig 138 kPa is allowable CA...

Страница 44: ... in step 6 below This eliminates the possibility of contaminating the analytical cell and having to purge for an extended period to reach equilibrium 1 Close all valves on the sample manifold 2 Open the valve on sample inlet line to be purged and any shut off valve that may be installed 3 Connect purge gas to the sample inlet line 4 Use a flowmeter on the purge gas and adjust flow rate to 1 cfh 0 ...

Страница 45: ...ction on operating the instrument Section 4 3 9 Installation Checklist After installing the system and prior to powering up the system verify the following items 1 Each gas line has been purged for at least 1 hour prior to connection to the analyzer inlets 2 There are no leaks at the sample inlet gas connection to the instrument 3 There are no leaks between the span gas cylinder and the analyzer s...

Страница 46: ...Installation Model 2120XL Teledyne Analytical Instruments 34 ...

Страница 47: ...GS NEVER INTRODUCE GASES OTHER THAN ARGON INTO THE ANALYZER IF EXPLOSIVE FLAMMABLE OR CORROSIVE GASES OR GAS MIXTURES ARE ALLOWED TO FLOW INTO THE ANALYZER FIRE OR EXPLOSION CAN RESULT THIS ANALYZER IS NOT DESIGNED FOR USE IN HAZARDOUS AREAS EQUIPMENT DAMAGE MAY RESULT IF THE ANALYTICAL CELL IN THIS UNIT IS EXPOSED TO PRESSURE CAUSING IT TO BREAK OR SHATTER TO PREVENT THIS NEVER EXCEED 20 PSIG 38 ...

Страница 48: ...owing the instrument to warm up and the readings stabilize Drift occurs until internal temperatures stabilize and the analytical cell is completely purged A persistent drift indicates an improperly purged system or an air leak into the system 4 2 Zero and Span Calibration The Model 2120XL is designed to provide a linear response over the 0 100 ppm concentration range for nitrogen in argon Therefor...

Страница 49: ...are in effect Ranges LO 1 ppm MED 10 ppm HI 100 ppm Auto Ranging ON Alarm Relays Defeated 100 and 200 ppb HI Not failsafe Not latching Zero Auto every 0 days at 0 hours Span Auto at 000008 00 ppm every 0 days at 0 hours If you choose not to use password protection the default password is automatically displayed on the password screen when you start up and you simply press ENTER for access to all f...

Страница 50: ...ng procedures 4 5 Analyzer Functions Analyzer functions are accessed from front panel keys There are six selectable functions plus the ENTER and ESCAPE keys They are 1 Analyze This is the main operational screen of the analyzer and displays the current concentration plus an error indication if any error exists 2 System This function contains nine sub functions that are used to user to set up the i...

Страница 51: ...1 Hierarchy of Functions and Sub Functions 4 5 1 System Menu Dig_filt Self test Pwd Logout Err More Autocal Flow Hold Calholdtimer More Model Out cal Lin There are eleven sub functions within the System function as described below Specific procedures for their use follow the descriptions ...

Страница 52: ...ted Auto Cal Used to define an automatic calibration sequence and or start an Auto Cal Flow Used to set the flow through the flow controller TRAK HLD The operator sets whether the instrument analog outputs track the concentration change during calibration and sets a time delay for the concentration alarms after calibration Cal Hold Timer Allows alarm suppression and analog output value hold times ...

Страница 53: ...the response time will decrease 4 5 1 2 SELF TEST The system self test is automatically initiated when the unit is powered up It can also be activated by the user from the SYSTEM menu To manually initiate a self test press the STSTEM key and navigate to Self Test using the arrow keys Press ENTER to engage the function and the following screen appears Perform System Test ENT Yes ESC No Pressing ENT...

Страница 54: ...ord is assigned the operator must log out to activate it Until then anyone can continue to operate the instrument without entering the new password Only one password can be defined Before a unique password is assigned the system assigns TAI by default This allows access to anyone After a unique password is assigned to defeat the security the password must be changed back to TAI If a password is as...

Страница 55: ...linking over to PSWD and press ENTER to select the password function Either the default TAI password or AAA place holders for an existing password will appear on screen depending on whether or not a password has been previously installed Enter PWD TAI or A A A If you are not using password protection press ENTER to accept TAI as the default password If a password has been previously installed ente...

Страница 56: ...assword either the default TETAI or the previously assigned password or press ESCAPE to keep the existing password and move on If you chose ENTER to change the password the password assignment screen appears Enter New Pwd T A I or Enter New Pwd AAA Enter the password using the arrow keys to move back and forth between the existing password letters and the arrow keys to change the letters to the ne...

Страница 57: ... return to the System menu Use the arrow keys to retype your password and press Enter when finished Your password will be stored in the microprocessor and the system will immediately switch to the Analyze screen and you now have access to all instrument functions If all alarms are defeated the Analyze screen appears as 0 0 p pm Anlz Range 0 100 If an alarm is tripped the second line will change to...

Страница 58: ... Until Password Reentered 4 5 1 5 ERR During analysis if the system detects a fault and error signal is sent and shows a flashing E in the right corner of the Analyze screen as follows N2 2 3 p pb E Rng 100 0pb 100 2 c cm To obtain more information about the error press SYSTEM and navigate to the Err function Then pres ENTER to display the particular error screen There are 14 possible error screen...

Страница 59: ...uto calibration function ON or OFF To use the Auto Cal function your instrument must be equipped with the optional auto calibration valve manifold Note To use the Auto Cal function the analyzer must be equipped with the Auto Cal option which includes a solenoid valve manifold for automatic switching of sample zero or span gas When equipped with the Auto Cal option the analyzer can cycle itself thr...

Страница 60: ... Every screen appears Zero schedule OFF Day Ød Hour Øh Move the blinking highlight to the Day field then use the arrow keys to display the correct value for the day Once the correct day is displayed press ENTER to accept the value and to move to the start time value Use the arrow keys to set a start time value Press ENTER again to accept the value To turn ON the SPAN and or ZERO cycles to activate...

Страница 61: ...ion the blinking over the Flow function and press ENTER to enter the function The following screen will appear Flow 100 0 ccm Sens Vout 300 0 mV The current flow rate 100 will be blinking and can be changed using the arrow keys Press ENTER when the proper flow rate is indicated on the display screen 4 5 1 8 TRACKING DURING CALIBRATION The user has the option of setting the preference as to whether...

Страница 62: ... which the alarms will be suppressed during a calibration event To set the time period for a hold press the SYSTEM key to display the first System menu Use the arrow keys to position the blinking over the More function and press ENTER A second screen of system function will appear Use the arrow keys to position the blinking over the Calholdtimer function and press ENTER to advance to the Calholdti...

Страница 63: ...s equipped with a secondary 0 1 VDC output this function can be used to calibrate the 0 to 1 volt output as well by using a digital voltmeter on the 0 1 volt output To enter the 4 to 20 mA output adjust function Press the SYSTEM key to display the first System menu Use the arrow keys to position the blinking over the More function and press ENTER Repeat the above to ENTER at More a second time Thi...

Страница 64: ...are Zero point pure argon 9 data points between zero and full span Full Span 85 100 ppm N2 in Ar or 85 100 of the highest full range The linearization can be performed manually or automatically depending on the chosen setting To enter the linearization function Press the SYSTEM key to display the first System menu Use the arrow keys to position the blinking over the More function and press ENTER R...

Страница 65: ... of the sample gas as reported by the analyzer In AUTO mode this value is not editable but is entered automatically by the routine The value for Out is editable in both Man and Auto modes Out is entered by the user and represents the desired linearized value of the sample For instance feeding the analyzer a prepared linearizer sample gas whose concentration is known to be 10 0 ppm and the analyzer...

Страница 66: ...highest range 0 100 ppm If calibration gas is low value for example 10 ppm to improve accuracy at that level you can expect to have less accuracy when readings surge much higher than that 4 5 2 The Zero and Span Functions The Model 2120XL is designed to provide a linear response over the analysis range for nitrogen in argon Therefore once the linearization procedure has been performed as described...

Страница 67: ...t number S1748 120 or S1748 240 depending on AC voltage is ideal for this Alternatively a zero gas cylinder with a low ppb nitrogen level can be used for zeroing in the low ppm range specified as long as the N2 concentration is known The second point is fixed by a certified span gas normally supplied in a high pressure cylinder 4 5 2 3 ZERO CAL The ZERO button on the front panel is used to enter t...

Страница 68: ...ed the following screen appears N2 1 2p pb Zero ENT to Finish In the Manual Mode the user has the opportunity to decide when the zero settling is close enough to zero to be valid When the value adjacent to N2 is sufficiently close to zero and sufficiently stable press ENTER to accept the zero reading After pressing ENTER two screens will appear that indicate that the zero level has been acquired a...

Страница 69: ... 6 Val 12345 where the Δ Val 12345 is the live display of the change in the adc for G01 When the countdown reaches zero zero calibration is complete and the screen reverts to the Analyze mode screen 4 5 2 4 SPAN CALIBRATION The SPAN button on the front panel is used to enter the span calibration function Span calibration can be performed in either the automatic or manual mode In the automatic mode...

Страница 70: ... Manual Span If manual span mode was selected the following screen appears 39 25 p pm ENT to Finish In the Manual Mode the user has the opportunity to decide when the span settling is close enough to the actual concentration to be valid When the value is sufficiently close to the known concentration and sufficiently stable press ENTER to accept the span calibration 4 5 2 3 2 Auto Mode Span If AUTO...

Страница 71: ...utton The following screen appears R1 1 00p pm R2 10 00p pm R3 100 0p pm Rng Auto where either the 1 00 10 00 100 0 or Auto is blinking Use the arrow keys to position the blinking over the range value to be changed Then use the arrow keys to modify the range value Continue with the arrow keys to position the blinking over the next range value to be changed and modify with the arrow keys Move the b...

Страница 72: ...rm modes can be set as latching or non latching and either failsafe or non failsafe or they can be defeated altogether The setpoints for the alarms are also established using this function Decide how your alarms should be configured The choice will depend upon your process Consider the following four points 1 Which if any of the alarms are to be high alarms and which if any are to be low alarms Se...

Страница 73: ... which would normally activate the alarms The defeat function can also be used to reset a latched alarm See procedures below If you are using password protection you will need to enter your password to access the alarm functions Follow the instructions in Section 4 5 1 3 to enter your password Once you have clearance to proceed enter the Alarm function Press the ALARM button on the front panel to ...

Страница 74: ...ggle it to N and back to Y 4 6 The Analyze Function Normally all of the functions automatically switch back to the Analyze function when they have completed their assigned operations Pressing the ESCAPE button in many cases also switches the analyzer back to the Analyze function Alternatively you can press the ANALYZE button at any time to return to analyzing your sample 4 7 Signal Output The stan...

Страница 75: ...s range To relate the signal output to the actual concentration it is necessary to know what range the instrument is currently on especially when the analyzer is in the auto ranging mode To provide an indication of the range a second pair of analog output terminals are used They generate a steady preset voltage or current when using the current outputs to represent a particular range The following...

Страница 76: ...Operation Model 2120XL Teledyne Analytical Instruments 64 ...

Страница 77: ...nce Schedule Perform a routine calibration of the analyzer at least once every one to two weeks Keep a log of the percentage zero and percentage span deviation settings This ensures not only that accuracy is maintained it also may help in troubleshooting the analyzer if these settings vary widely at each calibration or vary consistently up or down scale If the readings are stable from calibration ...

Страница 78: ...flow rate Every 1 2 weeks Check for excessive accumulation of dirt Weekly Check gas lines for leaks Yearly 5 3 Fuse Replacement 1 Place small screwdriver in notch and pry cover off as shown in Figure 5 1 Figure 5 1 Removing Fuse Block from Housing 2 To change between American and European fuses remove the single retaining screw flip Fuse Block over 180 degrees and replace screw 3 Replace fuse as s...

Страница 79: ...ests the sample 5V and 15V power supplies 0 OK 1 5 V Failure 2 15 V Failure 3 Both Failed Analog Set non zero sample on analog output channel 1 of range and channel 2 Range ID and sample response 0 OK 1 Analog channel 1 of Range is incorrect 2 Analog channel 1 Range ID is incorrect 3 Both channels are incorrect Preamp A Tests the bypass sensor input B Sets a zero level on preamp then tests respons...

Страница 80: ...l cause the system alarm to trigger These are non latching so when all alarms have been dispatched if possible the system alarm will be cease LED Display Error 0x0001 LED Display Error This indicates a problem with the LED interface Contact TAI Flow Error 0x0002 Flow Error Flow control system has problems and cannot control the flow This may be a temporary self correcting error If it persists cont...

Страница 81: ...mp 0 0V The system test on the preamp is incorrect at the zero level SysTestPreamp_0_7V 0x1000 Sys Test Preamp 0 7V The system test on the preamp is incorrect at the non zero level InvLinearErr 0x4000 Linearization Error The dataset for linearization could not be processed Most likely two linearization outputs have been set for the same input 5 6 Sensor Replacement While it is possible to replace ...

Страница 82: ...Maintenance Model 2120XL Teledyne Analytical Instruments 70 ...

Страница 83: ...timal operation Zero Cal Gas Through Scrubber TAI P N S1748 Span Cal Gas 70 100 ppm N2 in Ar Flow Accuracy 0 to 200 sccm 1 full scale Operating Temperature 32 104 F 0 40 C Operating Pressure 4 20 psig 27 6 138 kPa Power Required 85 240 VAC 50 60 Hz 60 W Sample Connections 1 8 tube fittings Accuracy 1 full scale 0 100 ppm Alarms Two programmable concentration alarms and a system alarm Relay contact...

Страница 84: ... 1 S01748 120 Scrubber of N2 Gas for zero cal 120 V OR 1 S01748 240 Scrubber of N2 Gas for zero cal 240 V 1 F2374 Flow Control Module 1 A85552 2120XL std EPROM for Main PCB Note Orders for replacement parts should include the part number if available and the model and serial number of the instrument for which the parts are intended Orders should be sent to TELEDYNE ANALYTICAL INSTRUMENTS 16830 Che...

Страница 85: ...Trace Nitrogen in Argon Analyzer Appendix Teledyne Analytical Instruments 73 A 3 Drawing List D84123 Outline Drawing C85455 Internal Piping Drawing C85454 Wiring Diagram ...

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