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Trace Oxygen Analyzer  

Operational Theory 

 Teledyne 

Analytical 

Instruments 

13 

words it has a linear characteristic curve, as shown in Figure 2-3. Measuring 
circuits do not have to compensate for nonlinearities. 

In addition, since there is zero output in the absence oxygen, the 

characteristic curve has close to an absolute zero (within ± 1 ppm 
oxygen). In practical application, zeroing may still used to compensate 
for the combined zero offsets of the cell and the electronics. (The 
electronics is zeroed automatically when the instrument power is turned 
on.) 

 

 

 

Figure 2-3. Characteristic MFC Input/Output Curve 

 

2.3 Sample System 

The sample system delivers gases to the Micro-Fuel Cell sensor 

from the analyzer rear panel inlet. Depending on the mode of operation 
either sample or calibration gas is delivered. 

The Model 3020T sample system is designed and fabricated to 

ensure that the oxygen concentration of the gas is not altered as it travels 

Содержание 3020T

Страница 1: ...nal protective equipment may be required when servicing this instrument Hazardous voltages exist on certain components internally which may persist for a time even after the power is turned off and disconnected Only authorized personnel should conduct maintenance and or servicing Before conducting any maintenance or servicing consult with authorized supervisor manager P N M65908 8 18 2014 ...

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Страница 3: ... 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 4: ...s The internal valves are entirely under the control of the 3020T electronics to automatically switch between gases in synchronization with the analyzer s operations 3020T F Includes flame arrestors for Group C and D service 3020T G Includes flame arrestors for Groups C and D service plus gas control valves as in C option above 3020T H Includes flame arrestors for Group B hydrogen service 3020T I ...

Страница 5: ...Model 3020T Teledyne Analytical Instruments iv ...

Страница 6: ...procedures 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 hazar...

Страница 7: ...our 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 your instrument Ma...

Страница 8: ... Operator Interface 3 1 5 1 UP DOWN Switch 4 1 5 2 ESCAPE ENTER Switch 4 1 5 3 Displays 5 1 6 Recognizing Difference Between LCD VFD 5 1 7 Equipment Interface 5 1 7 1 Electrical Connector Panel 5 1 7 2 Gas Connector Panel 7 Operational Theory 9 2 1 Introduction 9 2 2 Micro Fuel Cell Oxygen Sensors 9 2 2 1 Principles of Operation 9 2 2 2 Anatomy of a Micro Fuel Cell 10 2 2 3 Electrochemical Reactio...

Страница 9: ...rt 27 3 3 9 Remote Sensor and Solenoid Valves 29 3 4 Installing the Micro Fuel Cell 30 3 5 Gas Connections 30 Operation 33 4 1 Introduction 33 4 2 Using the Controls 33 4 2 1 Mode Function Selection 34 4 2 1 1 Analysis Mode 34 4 2 1 2 Setup Mode 34 4 2 2 Data Entry 36 4 2 2 1 ENTER 36 4 2 2 2 ESCAPE 37 4 3 The AUTO CAL Function 37 4 4 The PWD Password Function 38 4 4 1 Entering the Password 38 4 4...

Страница 10: ...1 Setting the Analog Output Ranges 51 4 10 2 Automatic Ranging 51 4 10 3 Fixed Range Analysis 51 4 11 The CONTRAST Function 52 4 12 The STANDBY Function 52 4 13 The Analysis Mode 53 Maintenance 55 5 1 Routine Maintenance 55 5 2 Major Internal Components 55 5 3 Cell Replacement 56 5 3 1 Storing and Handling Replacement Cells 56 5 3 2 When to Replace a Cell 57 5 3 3 Removing the Micro Fuel Cell 58 5...

Страница 11: ...odel 14 Figure 2 5 Flow Diagram 15 Figure 2 6 Block Diagram of the Model 3020T Electronics 16 Figure 3 1 Front View of the Model 3020T Simplified 20 Figure 3 2 Required Front Door Clearance 21 Figure 3 3 Electrical Connector Panel 21 Figure 3 4 Primary Input Power Connections 22 Figure 3 5 Analog Output Connections 23 Figure 3 6 Types of Relay Contacts 25 Figure 3 7 Remote Solenoid Return Connecto...

Страница 12: ...alytical Instruments xi List of Tables Table 3 1 Analog Concentration Output Example 24 Table 3 2 Analog Range ID Output Example 24 Table 3 3 RS 232 Signals 28 Table 3 4 Commands via RS 232 Input 28 Table 3 5 Required RS 232 Options 29 ...

Страница 13: ...leaks always exist The customer should ensure that the principles of operating this equipment are well understood by the user Misuse of this product in any manner tampering with its components or unauthorized substitution of any component may adversely affect the safety of this instrument Since the use of this instrument is beyond the control of Teledyne no responsibility by Teledyne its affiliate...

Страница 14: ...Model 3020T are Monitoring inert gas blanketing Air separation and liquefaction Chemical reaction monitoring Semiconductor manufacturing Petrochemical process control Quality assurance Gas analysis certification 1 3 Main Features of the Analyzer The Model 3020T Trace Oxygen Analyzer is sophisticated yet simple to use The main features of the analyzer include A 2 line alphanumeric display screen dr...

Страница 15: ...st Two adjustable concentration alarms and a system failure alarm Extensive self diagnostic testing at startup and on demand with continuous power supply monitoring RS 232 serial digital port for use with a computer or other digital communication device Four analog outputs two for concentration 0 1 VDC and isolated 4 20 mA DC and two for range identification 1 4 Model Designations 3020T Standard m...

Страница 16: ...lable in combination 1 5 Operator Interface All controls and displays on the standard 3020T are accessible from outside the housing The instrument has two simple operator controls The operator has constant feedback from the instrument through an alphanumeric display a digital oxygen meter and a sample flow meter The displays and controls are described briefly here and in greater detail in chapter ...

Страница 17: ...ts and attributes Range Set up the 3 user definable ranges for the instrument Contrast Adjust LCD contrast Standby Leave analyzer powered but no outputs or displays WARNING THE POWER CABLE MUST BE DISCONNECTED TO FULLY REMOVE POWER FROM THE INSTRUMENT Subfunctions Once a Function is entered the UP DOWN switch is used to select between any subfunctions displayed on the VFD screen Parameter values W...

Страница 18: ...adout from 1 25 It is accurate across all analysis ranges without the discontinuity inherent in analog range switching Alphanumeric Interface Screen The backlit VFD screen is an easy to use interface from operator to analyzer It displays values options and messages that give the operator immediate feedback Flowmeter Monitors the flow of gas past the sensor Readout is 0 2 to 2 4 standard liters per...

Страница 19: ...e power cable must be disconnected to fully remove power from the instrument Electrical Connections The electrical connections on the electrical connector panel are described briefly here and in more detail in chapter 3 Installation Figure 1 2 Electrical Connector Panel ...

Страница 20: ... Remote Span Zero Digital inputs allow external control of analyzer calibration Calibration Contact To notify external equipment that instrument is being calibrated and readings are not monitoring sample Range ID Contacts Four separate dedicated range relay contacts Low Medium High Cal Network I O Serial digital communications for local network access For future expansion Not implemented at this p...

Страница 21: ... Calibration Gas Ports Separate fittings for zero span and sample gas input plus internal valves for automatically switching the gases in sync with the 3020 electronics Note If you require highly accurate Auto Cal timing use external Auto Cal control where possible The internal clock in the Model 3020T is accurate to 2 3 Accordingly internally scheduled calibrations can vary 2 3 per day ...

Страница 22: ...processing input output and display functions for the analyzer 2 2 Micro Fuel Cell Oxygen Sensors 2 2 1 Principles of Operation The oxygen sensor used in the Model 3020T is a Micro Fuel Cell designed and manufactured by Analytical Instruments It is a sealed plastic disposable electrochemical transducer The active components of the Micro Fuel Cell are a cathode an anode and the 15 aqueous KOH elect...

Страница 23: ...any environment or sample stream It is effectively sealed although one end is permeable to oxygen in the sample gas The other end of the cell is a contact plate consisting of two concentric foil rings The rings mate with spring loaded contacts in the sensor block assembly and provide the electrical connection to the rest of the analyzer Figure 2 1 illustrates the external features Figure 2 1 Micro...

Страница 24: ...t the life of the cell This flexibility assures that the sensing membrane remains in its proper position keeping the electrical output constant The entire space between the diffusion membrane above the cathode and the flexible rear membrane beneath the anode is filled with electrolyte Cathode and anode are submerged in this common pool They each have a conductor connecting them to one of the exter...

Страница 25: ...e material In the absence of oxygen no current is generated 2 2 4 The Effect of Pressure In order to state the amount of oxygen present in the sample in parts per million or a percentage of the gas mixture it is necessary that the sample diffuse into the cell under constant pressure If the total pressure increases the rate that oxygen reaches the cathode through the diffusing membrane will also in...

Страница 26: ...ion zeroing may still used to compensate for the combined zero offsets of the cell and the electronics The electronics is zeroed automatically when the instrument power is turned on Figure 2 3 Characteristic MFC Input Output Curve 2 3 Sample System The sample system delivers gases to the Micro Fuel Cell sensor from the analyzer rear panel inlet Depending on the mode of operation either sample or c...

Страница 27: ...ncorporates 1 4 inch tube fittings for sample inlet and outlet connections at the rear panel For metric system installations 6 mm adapters are supplied with each instrument to be used if needed The sample or calibration gas flows through the system is monitored by a flowmeter downstream from the cell Figure 2 4 shows the piping layout and Figure 2 5 shows the flow diagram for the standard model Fi...

Страница 28: ... of the power supply and the main electronic PC boards The signal processing electronics including the microprocessor analog to digital and digital to analog converters are located on the motherboard at the bottom of the case The preamplifier board is mounted on top of the motherboard These boards are accessible after removing the access panel Figure 2 6 is a block diagram of the Analyzer electron...

Страница 29: ...Operational Theory Model 3020T Teledyne Analytical Instruments 16 Figure 2 6 Block Diagram of the Model 3020T Electronics ...

Страница 30: ...at is temperature independent The output from the second stage amplifier is sent to an 18 bit analog to digital converter controlled by the microprocessor The digital concentration signal along with input from the control panel is processed by the microprocessor and appropriate control signals are directed to the display alarms and communications port The same digital information is also sent to a...

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Страница 32: ...er The Model 3020T is designed for bulkhead mounting in hazardous environments There are four mounting lugs one in each corner of the enclosure as shown in Figure 3 1 The outline drawing at the back of this manual gives the mounting hole size and spacing The drawing also contains the overall dimensions Do not forget to allow an extra 13 8 for the hinges Be sure to allow enough space in front of th...

Страница 33: ...Installation Model 3020T Teledyne Analytical Instruments 20 Figure 3 1 Front View of the Model 3020T Simplified ...

Страница 34: ...ure 3 2 Required Front Door Clearance 3 3 Electrical Connections Figure 3 3 shows the Model 3020T Electrical Connector Panel There are terminal blocks for connecting power communications and both digital and analog concentration outputs Figure 3 3 Electrical Connector Panel ...

Страница 35: ...ch before the power source is connected See Figure 3 4 for detailed connections DANGER Power is applied to the instrument s circuitry as long as the instrument is connected to the power source The Standby function switches power on or off to the displays and outputs only Figure 3 4 Primary Input Power Connections 3 3 2 Fuse Installation The fuse holders accept 5 x 20 mm 1 6 A T type slow blow fuse...

Страница 36: ...e Full scale 100 of programmable range 4 20 mA DC Range ID M Option 8 mA Low Range 12 mA Medium Range 16 mA High Range 20 mA Air Cal Range Examples The analog output signal has a voltage which depends on the oxygen concentration AND the currently activated analysis range To relate the signal output to the actual concentration it is necessary to know what range the instrument is currently on especi...

Страница 37: ...ent a particular range Table 3 2 gives the range ID output for each analysis range Table 3 2 Analog Range ID Output Example Range Voltage V Current mA LO 0 25 8 MED 0 50 12 HI 0 75 16 CAL 0 25 1 00 20 3 3 4 Alarm Relays There are three alarm circuit connectors on the alarm relays block under RELAY OUTPUTS for making connections to internal alarm relay contacts Each provides a set of Form C contact...

Страница 38: ...igured 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 System Alarm Actuates when DC power supplied to circuits is unacce...

Страница 39: ... input 5 to 24 V input across the and terminals puts 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 the external span valve appropriately See 3 3 9 Remote Sensor and Solenoid Valves With the C option the internal valves automatically operate syn...

Страница 40: ...trolled synchronously If you have the C Internal valve option which includes additional zero and span gas inputs the 3020T automatically regulates the zero span and sample gas flow 3 3 6 Range ID Relays There are four dedicated RANGE ID CONTACT relays The first three ranges are assigned to relays in ascending order Low range is assigned to RANGE 1 ID Medium range is assigned to RANGE 2 ID and High...

Страница 41: ...e range in use HI MED LO The span of the range 0 100 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 Four input functions using RS 232 have been implemented to date They are described in Table 3 4 Table 3 4 Commands via RS 232 Input Command Description as enter Immediately starts an autospa...

Страница 42: ...SOR connector is not used and the SOLENOID RETURN connectors are used without the C option to synchronize external gas control valves See Figure 3 7 Figure 3 7 Remote Solenoid Return Connector Pinouts 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 t...

Страница 43: ...d installing cells 3 5 Gas Connections Before using this instrument it should be determined if the unit will be used for pressurized service or vacuum service and low pressure applications Inspect the restrictor kit that came with the unit The kit consists of two restrictors and a union for 1 4 diameter tubing Notice that the two 1 3 4 long 1 4 diameter tubing are restrictors It has an open end an...

Страница 44: ...ting This may require an additional 1 8 turn beyond finger tight 2 Hold the fitting body steady with a backup wrench and with another wrench rotate the nut another 1 1 4 turns SAMPLE IN In the standard model gas connections are made at the SAMPLE IN and EXHAUST OUT connections Calibration gases must be tee d into the Sample inlet with appropriate valves The gas pressure in should be reasonably reg...

Страница 45: ...indirectly through the Remote Cal Inputs described below Pressure flow and safety considerations are the same as prescribed for the SAMPLE IN inlet above 3 6 Testing the System Before plugging the instrument into the power source Check the integrity and accuracy of the gas connections Make sure there are no leaks Check the integrity and accuracy of the electrical connections Make sure there are no...

Страница 46: ...g failsafe etc Establish a security password if desired requiring Operator to log in Before you configure your 3020T these default values are in effect Ranges LO 0 100 ppm MED 0 1 000 ppm HI 0 10 000 ppm Auto Ranging ON Alarm Relays Defeated 1000 ppm HI Not failsafe Not latching Zero Auto every 0 days at 0 hours Span Auto at 209 000 ppm every 0 days at 0 hours Password T E T A I 4 2 Using the Cont...

Страница 47: ...l in a series of screens used in the Setup Mode to configure the analyzer for the specific application The DOWN UP commands scroll through the options displayed on the VFD screen The selectable option appears between arrows When you reach the desired option by scrolling ENTER the selection as described below ESCAPE takes you back up the hierarchy of screens until you reach the MAIN MENU again ESCA...

Страница 48: ... alarm will be active or defeated HI or LO acting latching or not and failsafe or not 9 RANGE Used to set up three analysis ranges that can be switched automatically with auto ranging or used as individual fixed ranges 10 CONTRAST The contrast function is disabled in this version 11 STANDBY Remove power to outputs and displays but maintain power to internal circuitry Any function can be selected a...

Страница 49: ...e selected option is a function or subfunction ENTER moves the display to the VFD screen for that function or subfunction When the selected option is a modifiable item the DOWN UP control can be used to increment or decrement that modifiable item to the value or action you want Then you ENTER the item which also puts you into the next field to continue programming When the last field is entered EN...

Страница 50: ...y zero and span the instrument Note If you require highly accurate timing of your AUTO CAL use external AUTO CAL control where possible The internal clock in the Model 3020T is accurate to 2 3 Accordingly internally scheduled calibrations can vary 2 3 per day To setup an AUTO CAL cycle Scroll to AUTO CAL and ENTER A new screen for Span Zero set appears Span OFF Nxt 0d 0h Zero OFF Nxt 0d 0h If SPAN...

Страница 51: ...t on alarm conditions without entering the password Only one password can be defined After a password is assigned the operator must log out to activate it Until then anyone can continue to operate the instrument without entering the new password To defeat the security after a unique password is activated the password must be changed back to TETAI Note If you use password security it is advisable t...

Страница 52: ...u have clearance to proceed PWD Restrictions Removed In a few seconds if you do not ESCAPE you will be given the opportunity to change this password or keep it and go on Change Password ENT Yes ESC No ESCAPE to move on or proceed as in Changing the Password below 4 4 2 Installing or Changing the Password If you want to change the existing password Proceed as above in Entering the Password until yo...

Страница 53: ...hen you have finished typing the new password the last ENTER enters it A verification screen appears The screen will prompt you to retype your password for verification A A A A A Retype PWD To Verify Wait a moment for the entry ENT screen You will be given clearance to proceed A A A A A ENT TO Proceed ENTER the letters of your new password Your password will be stored in the microprocessor and the...

Страница 54: ...ON and ENTER The screen displays the manufacturer model and software version information 4 7 The SELF TEST Function The Model 3020T has a built in self testing diagnostic routine Preprogrammed signals are sent through the power supply output board and sensor circuit The return signal is analyzed and at the end of the test the status of each function is displayed on the screen either as OK or as a ...

Страница 55: ...rnal and external sampling system and improve performance beyond published specification limits The analyzer is calibrated using zero and span gases Any suitable oxygen free gas can be used for zero gas as long as it is known to be oxygen free and does not react adversely with the sample system Although the instrument can be spanned using air a span gas with a known oxygen concentration in the ran...

Страница 56: ...tive readings from the sensor to determine when the output is within the acceptable range for zero In the manual mode the operator determines when the reading is within the acceptable range for zero Make sure the zero gas is connected to the instrument If you get a CELL FAILURE message skip to Section 4 8 1 3 4 8 1 1 AUTO MODE ZEROING Press Zero to enter the zero function mode The screen allows yo...

Страница 57: ...pears allows you to select between automatic or manual zero calibration Use the keys to toggle between AUTO and MAN zero settling Stop when MAN appears blinking on the display Zero Settling Man ENT To Begin Press Enter to begin the zero calibration After a few seconds the first of five zeroing screens appears The number in the upper left hand corner is the first stage zero offset The microprocesso...

Страница 58: ...t back on Readjust the gas pressure into the analyzer until the flowrate as read on the analyzer s SLPM flowmeter settles between 0 5 and 2 4 SLPM approximately 1 5 scfh If you are using password protection you will need to enter your password to gain access to either of these functions Follow the instructions in section 4 4 to enter your password Once you have gained clearance to proceed you can ...

Страница 59: ...n reading is acceptable and manually exits the function 4 8 2 1 AUTO MODE SPANNING Scroll to SPAN and ENTER the SPAN function The screen that appears allows you to select whether the span calibration is to be performed automatically or manually Use the DOWN UP control to toggle between AUTO and MAN span settling Stop when AUTO appears on the display Span Settling AUTO ENT For Next Use ENTER to mov...

Страница 60: ...od of span value Use ESCAPE ENTER to choose the digit and use DOWN UP to choose the value of the digit When you have finished typing in the concentration of the span gas you are using repeatedly select ENTER until the rightmost digit is reached then the next ENTER will exit the Span Val field One more ENTER will enter the new span value bring up the next screen and start the span calibration Once ...

Страница 61: ...r 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 Setting an alarm as HIGH triggers the alarm when the oxygen concentrati...

Страница 62: ...feat 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 4 to enter your password Once you have clearance to proceed ENTER the ALARM function AL 1 AL 2 Choose Alarm Use the DOWN UP control to blink your choice of alarm AL 1 or AL 2 Then EN...

Страница 63: ...o program up to three concentration ranges to correlate with the DC analog outputs If no ranges are defined by the user the instrument defaults to Low 0 100 ppm Med 0 1 000 ppm High 0 10 000 ppm The Model 3020T is set at the factory to default to auto ranging In this mode the microprocessor automatically responds to concentration changes by switching ranges for optimum readout sensitivity If the c...

Страница 64: ... value of the range all ranges begin at 0 ppm Repeat for each range you want to set ENTER to accept the values and return to the Analysis Mode See note below Note The ranges must be increasing from low to high for example if range 1 is set as 0 100 ppm and range 2 is set as 0 1000 ppm range 3 cannot be set as 0 500 ppm since it is lower than range 2 4 10 2 Automatic Ranging After defining your ana...

Страница 65: ...ptional mA dc output However the digital readout and the RS 232 output continue to read the true value of the oxygen concentration regardless of the analog output range 4 11 The CONTRAST Function The contrast function is not available in this model 4 12 The STANDBY Function In STANDBY the analyzer s internal circuits are powered but there are no displays or outputs from the analyzer WARNING THE PO...

Страница 66: ... analyzer is monitoring the sample measuring and displaying the amount of oxygen and reporting alarm conditions Normally the Version Self Test Sensor Main Menu and the Span and Zero in auto settling mode functions automatically switch back to the Analysis Mode ANALYZE screen when they have completed their assigned operations After four or five seconds in the MAIN MENU without any action by the ope...

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Страница 68: ... by unbolting and swinging open the front cover as described earlier The major internal component locations are shown in Figure 3 1 the cell block is illustrated in Figure 3 2 and the fuse receptacle is shown in Figure 3 3 The 3020T contains the following major internal components Sensor L 2C Cell block Customer Interface PCB Power Supply on bottom surface Preamp PCB Contains Microprocessor Front ...

Страница 69: ... clean When the cell reaches the end of its useful life it is replaced The spent fuel cell should be discarded according to local regulations This section describes fuel cell care as well as when and how to replace it 5 3 1 Storing and Handling Replacement Cells To have a replacement cell available when it is needed it is recom mended that one spare cell be purchased 9 10 months after commissionin...

Страница 70: ... immediately flush eyes with water for at least 15 minutes Call physician See appendix Material Safety Data Sheet CAUTION DO NOT DISTURB THE INTEGRITY OF THE CELL PACKAGE UNTIL THE CELL IS TO ACTUALLY BE USED IF THE CELL PACKAGE IS PUNCTURED AND AIR IS PERMITTED TO ENTER THE CELL WILL REQUIRE AN EXCESSIVELY LONG TIME TO REACH ZERO AFTER INSTALLATION 1 2 WEEKS 5 3 2 When to Replace a Cell The chara...

Страница 71: ...e an existing cell 1 Remove power to the instrument by unplugging the power cord at the power source 2 Open the front panel door by pressing the release button on the top right corner of the door all the way in with a narrow gauge tool such as a small screwdriver and releasing it 3 Leave the cell block installed With one hand placed underneath the cell block ready to catch the Micro Fuel cell lift...

Страница 72: ...stalled into the unit the faster your TAI O2 sensor will recover to low O2 measurement levels CAUTION DO NOT TOUCH THE SENSING SURFACE OF THE CELL IT IS COVERED WITH A DELICATE TEFLON MEMBRANE THAT CAN LEAK WHEN PUNCTURED THE SENSOR MUST BE REPLACED IF THE MEMBRANE IS DAMAGED Before installing a new cell check the O ring in the base of the cell holder Replace if worn or damaged Place the cell on t...

Страница 73: ...l into the cell block Step 9 Push the gate on the cell block down so that the slots on the side of the gate engage the locating screws on the side of the block This forces the holder into position and forms a gas tight seal Step 10 Purge system with sample or zero gas Step 11 Power up Note If steps 4 through 10 are accomplished quickly elapsed time less than 15 seconds recovery to less than 1ppm l...

Страница 74: ...ation If it is determined that failure is due to faulty workmanship or material the cell will be replaced at no cost to you Note Evidence of damage due to tampering or mishandling will render the cell warranty null and void 5 4 Fuse Replacement WARNING Risk of electric shock high voltage exposed at the end of enclosure The 3020T requires two 5 x 20 mm 4 A T type Slow Blow fuses The fuses are locat...

Страница 75: ...DIAGNOSTIC Testing Preamp 83 During preamp testing there is a countdown in the lower right corner of the screen When the testing is complete the results are displayed Power OK Analog OK Preamp 3 The module is functioning properly if it is followed by OK A number indicates a problem in a specific area of the instrument Refer to Table 5 1 for number code information The results screen alternates for...

Страница 76: ...uments 63 Table 5 1 Self Test Failure Codes Power 0 OK 1 5 V Failure 2 15 V Failure 3 Both Failed Analog 0 OK 1 DAC A 0 1 V Concentration 2 DAC B 0 1 V Range ID 3 Both Failed Preamp 0 OK 1 Zero too high 2 Amplifier output doesn t match test input 3 Both Failed ...

Страница 77: ...tor visible from front of unit Positive pressure service Vacuum service optional Auto Cal Auto Zero Available with optional electrically operated valves Alarms One system failure alarm contact to detect power failure Two adjustable concentration threshold alarms with fully programmable setpoints Diagnostics Start up or on demand self testing function Displays 2 line by 20 alphanumeric VFD screen a...

Страница 78: ...emperature 5 of full scale over operating temperature range on factory default analysis ranges once thermal equilibrium has been achieved Analog outputs 0 1 VDC percent of range 0 1 VDC range ID 4 20 mA DC percent of range 4 20 mA DC range ID Password Access Can be user configured for password protection ...

Страница 79: ...d 1 C73870 A Main PCB 4 20 mA option 3 F1295 Fuse 4A 250V 5x20 mm T Slow Blow 2 O38 O ring 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 Chestnut Street City of Industry CA 91748 Phone 626 934 1500 Fax 626 961 2538 Web www...

Страница 80: ...Trace Oxygen Analyzer Appendix Teledyne Analytical Instruments 67 A 3 Drawing List D65908 Final Assembly Drawing D65909 Outline Drawing D65911 Wiring Diagram ...

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