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MAINTENANCE  

 

6

 

 
SECTION 
NUMBER 
 
 
 

TRANSMITTER MAINTENANCE

 

 
6.1 COLD 

START 

6.2 A/D 

CALIBRATION 

6.3 D/A 

CALIBRATION 

6.4 PUMP 

REPLACEMENT 

6.5 

BACK TO UP BATTERY REPLACEMENT 

6.6 ELECTRONIC 

REPAIRS 

 
 

SENSOR MAINTENANCE 

 
6.7 

TEST EQUIPMENT REQUIRED 

6.8 

TESTING AN OXYGEN SENSOR 

6.9 

OXYGEN SENSOR THERMOCOUPLE 

6.10 

OXYGEN SENSOR HEATER FAILURE 

6.11 CO

2

 OPTICAL SERVICE 

 

Teledyne Analytical Instruments 9070 Oxygen Analyzer 

Page 

41

 

Summary of Contents for 9070

Page 1: ...TELEDYNE ANALYTICAL INSTRUMENTS OXYGEN CARBON DIOXIDE ANALYZER TRANSMITTER MODEL 9070 May 1998 ...

Page 2: ...n 1 in Frequently Asked Questions on the next page 6 If you want to display the minimum oxygen press the DISPLAY button until the lower line of the display reads Sample like this Some of the menu items that may have to be set the first time the Analyzer is used Lower Line Oxygen 20 9 Sample 0 68 1 Select the Sample mode Setup 26 Continuous When the process gas is available continuously Eg Gas supp...

Page 3: ...The carbon dioxide sensor uses a specifically designed infra red source to increase the signal strength and reduce the effect of sensor drift However optical measurements are not absolute measurements like the zirconia oxygen sensor so occasional checks on a calibration gas confirm the accuracy 3 Why are there 3 sample modes and which one should I use The 9070 Analyzer can read and display the cur...

Page 4: ...ver it is acknowledged that there may be errors or omissions in this manual A list of details of any amendments or revisions to this manual can be obtained upon request from Teledyne Analytical Instruments Technical Enquires Teledyne Analytical Instruments welcome comments and suggestions relating to the product and this manual All correspondence should be addressed to Technical Enquires Teledyne ...

Page 5: ...ys isolate the Analyzer before working with the oxygen sensor The oxygen sensor must ALWAYS be connected to EARTH CAUTION 2 The oxygen sensor which is heated to 720 C 1320 F in this instrument can be a source of ignition in applications where fuel gases or very high oxygen percentages above 50 are present For these applications it will be necessary to provide a sampling line made of flame proof ma...

Page 6: ...SPECIFICATIONS 1 1 1 MODEL 9070 OXYGEN ANALYZER DESCRIPTION 1 2 DETAILED SPECIFICATIONS 1 3 ORDERING INFORMATION 1 4 MODEL SELECTION GUIDE Page 6 Teledyne Analytical Instruments 9070 Oxygen Analyzer ...

Page 7: ... to 0 1 ppm oxygen Displays 0 1 carbon dioxide resolution Automatic minimum maximum sample detection display and output to printer and 4 20 mA signals Automatic calibration of oxygen and carbon dioxide offset Linear output of oxygen and carbon dioxide for recording or control Built in safety features 16 different alarm functions warn the operator of gas composition sensor or Analyzer problems RS 2...

Page 8: ... 0 0 1 oxygen to 0 100 0 oxygen 0 1000ppm oxygen to 0 1 000 000ppm oxygen Low Range Linear oxygen 0 0 001 oxygen to 0 1 0 oxygen 0 10ppm oxygen to 0 10 000ppm oxygen Range of Output 2 Field selectable from the following Output Selection Zero Range Span Range Carbon Dioxide 0 90 10 100 Min span 10 Reducing Oxygen 10 1 10 10 10 1 10 30 In one decade steps Min span three decades Oxygen sensor EMF 0 1...

Page 9: ...inimum and maximum expected oxygen in sample particularly the minimum value 3 Other gas constituents Any combustibles will consume oxygen as they are burnt on the surface of the sensor 4 If the gas is under pressure or if the gas must be extracted to the 9070 Analyzer 5 Gas connection required 1 8 Swagelok is standard 6 Supply voltage 240 or 110 VAC 7 If auto manual on line oxygen gas calibration ...

Page 10: ... FOR THE OXYGEN SENSOR 2 7 THE OXYGEN SENSOR IMPEDANCE 2 8 AUTO CALIBRATION ELECTRONICS 2 9 AUTO CALIBRATION CHECKING OXYGEN SENSOR 2 10 AUTO CALIBRATION CHECKING CARBON DIOXIDE SENSOR 2 11 RS 485 232C PORTS 2 12 AMBIENT TEMPERATURE AND RELATIVE HUMIDITY MEASUREMENTS 2 13 WATCHDOG TIMER 2 14 BACK UP BATTERY Page 10 Teledyne Analytical Instruments 9070 Oxygen Analyzer ...

Page 11: ...re T is the temperature K at the zirconia disc 650 C 1200 F R is the gas constant F is the Faraday constant and PO2 INSIDE and PO2 OUTSIDE are the oxygen partial pressures at the inner and outer electrodes respectively with the higher oxygen partial pressure electrode being positive If dry air at atmospheric pressure 21 oxygen is used as a reference gas at the inner electrode the following equatio...

Page 12: ...rred to the main 9070 microprocessor via a digital link Span and zero calibration can be done from the keyboard of the 9070 The response from the CO2 cell is non linear with respect to carbon dioxide percentage but is linearised within the microprocessor on the CO2 PCB Calibrate to ZERO SPAN once every two months for best performance 2 4 THE ANALYZER The 9070 oxygen Analyzer is a microprocessor ba...

Page 13: ...rim the calibration to read 20 9 oxygen For more details see the set up section 5 5 number 10 11 Span gas On line automatic gas calibration checking is not normally required particularly if a gas sampling is being used Where it is required however when continuous gas monitoring is being used the sensor can be checked for accuracy on line A solenoid valve can admit calibrated gas mixtures into the ...

Page 14: ...s including the time they occurred will be transmitted to the printer and computer whenever they are first initiated accepted and cleared in the printer mode only If Fast Sample or Display Sample is selected in set up step 26 each time a new minimum rate of oxygen is detected this value plus date time will also be printed in the printer mode only NOTE The RS232 port is not available in the model 9...

Page 15: ...TING THE HORN RELAY 3 6 USING THE AUTOMATIC OXYGEN CHECK SYSTEM 3 7 CONNECTING THE PRINTER COMMISSIONING 3 8 CONNECTING POWER COLD START 3 9 CONNECTING POWER WARM START 3 10 COMMISSIONING SET UP MODE 3 11 RUN MODE 3 12 CHECKING THE ALARMS 3 13 THE OXYGEN SENSOR 3 14 SENSOR CALIBRATION OXYGEN 3 15 SENSOR CALIBRATION CARBON DIOXIDE Teledyne Analytical Instruments 9070 Oxygen Analyzer Page 15 ...

Page 16: ...h stud The mains earth should be connected to a sound electrical earth Do not connect shields at the field end Simply clip off and insulate An extra terminal strip may be required to connect all shields together This should be supplied by the installer IMPORTANT Before connection of mains power check that the mains voltage selector switch is in the correct position This switch is inside the front ...

Page 17: ... d R e d 5 1 5 2 He a t e r 1 He a t e r 1 P r i n t e ro r C o mp u t e r c o n n e c t i o n 4 2 0 mA o u t p u t S e l e c t a b l e r a n g e Op t i o n a l A l a r m R e l a y C o n t a c t s No r ma l l y C l o s e d 4 8 5 0 4 9 Ma i n sN Ma i n sA Ma i n sP o we rS u p p l y 2 4 0 1 1 5 V A C 4 7 Ma i n sE 4 1 4 2 4 3 4 4 4 6 4 5 C a l1S o l C a l1S o l C a l2S o l C a l2S o l P u r g eS o ...

Page 18: ...arm 4 35 36 Common Alarms All of the following conditions will cause a common alarm ADC Calibration Fail DAC Calibration Fail Oxygen Sensor Fail Oxygen Heater Fail Oxygen Sensor TC Open Gas Pump Fail Mains Frequency Check fail Oxygen Gas Calibration Check Error Carbon Dioxide Sensor Fail Watchdog Timer The watchdog timer is a special alarm It will force the common alarm to activate in the event of...

Page 19: ...noid Connection Ma i n sV o l t a g e1 1 0 2 4 0 A CS o l e n o i d s C a l2 S o l e n o i d 4 6 P u r g e P u r g e C a l1 S o l e n o i d C a l1 S o l e n o i d C a l2 4 5 4 3 4 4 4 1 4 2 3 7 CONNECTING THE PRINTER A v a i l a b l ef o r R S4 8 5n e t w o r k P R I N T E R D A T AL O G G E R O R S e rC o m 2 4 N e t w o r k N e t w o r k 2 3 2 2 R S2 3 2R x R S2 3 2T x 2 0 2 1 Serial Port Connec...

Page 20: ...11 RUN MODE When the Analyzer is turned on it will go to RUN mode The SET UP RUN button will toggle between the two modes The upper line of the display will now read the oxygen or oxygen and carbon dioxide if the optional carbon dioxide module has been installed in the front section of the cabinet If the oxygen sensor temperature is not above 650 C 1200 F a Sensor Low Temperature message be flashe...

Page 21: ...ment required is a bottle of 100 carbon dioxide Calibrate to ZERO SPAN once every two months for best performance NOTES For best results when calibrating the CO2 sensor please observe the following guidelines Don t connect the test gas directly to the sample pipe of the 9070 Allow the Analyzer to suck the gas in using the internal pump as it would in normal use This can be done by piercing a plast...

Page 22: ...nd press the ENTER key to lock that selection Press the SETUP RUN key to return to RUN mode The display will read CO Calibration 2 The span calibration takes about 40 seconds and as the calibration progresses more symbols will appear After the calibration is complete the option in set up 12 will return to CO2 Cal Done NOTE It is important that the gas flow rate is the same when using the calibrati...

Page 23: ...OPERATOR FUNCTIONS 4 SECTION NUMBER 4 1 DISPLAY BUTTON 4 2 ALARM BUTTON 4 3 ALARM SCHEDULE 4 4 POWER LAMP Teledyne Analytical Instruments 9070 Oxygen Analyzer Page 23 ...

Page 24: ... Any number of these variables can be displayed sequentially by pressing the DISPLAY button Items can be selected for display or deleted in set up step 29 on the keyboard In addition to the above lower line displays the Analyzer will automatically display 10 OXYGEN NOT READY until the sensor is over 650 C 1200 F If the heater does not get the sensor up to 650 C 1200 F within 20 minutes the OXYGEN ...

Page 25: ...e activated Refer to Section 6 10 If an ADC alarms occurs the heater s will automatically be turned off 3 Sensor TC Open The oxygen sensor thermocouple is open circuit The heater will switch off 4 Ref Pump Fail The reference air pump in the Analyzer has failed 5 ADC Cal Fail The analog to digital converter has been found to fall outside the normal calibration specifications In this case the oxygen...

Page 26: ...O2 Low The measured oxygen level is below the level set in set up 41 and the alarm delay set in set up 42 has expired See Section 5 5 41 for more details 18 O2 Very Low The measured oxygen level is below the level set in set up 43 and the alarm delay set in set up 44 has expired See Section 5 5 43 for more details 19 Sensor Temperature The oxygen sensor temperature is under 650 C 1200 F The oxygen...

Page 27: ... watchdog timer is attempting to reset the microprocessor Replace the 1630 1 microprocessor PCB 4 5 BURNER BYPASS SWITCH This switch is mounted on the terminal PCB near the POWER switch It does not provide any function in this Analyzer Teledyne Analytical Instruments 9070 Oxygen Analyzer Page 27 ...

Page 28: ...P THE ANALYZER 5 SECTION NUMBER 5 1 SET UP MODE SUMMARY 5 2 SET UP RUN MODES 5 3 FUNCTION SELECT 5 4 ENTER OPTION OR VALUE 5 5 SET UP FUNCTION DETAILS Page 28 Teledyne Analytical Instruments 9070 Oxygen Analyzer ...

Page 29: ...0 Cal Gas Yes no Set up steps 31 to 37 may be skipped automatically depending on the selection in set up step 30 31 First Calibration Time 32 Oxygen Content of Cal Gas 1 33 Maximum Acceptable Positive Error Gas 1 34 Maximum Acceptable Negative Error Gas 1 35 Period Between Gas 1 Autocals 36 Duration of Autocal Gas 1 37 Freeze Time Gas 1 38 Reset level 39 High oxygen alarm level 40 High oxygen alar...

Page 30: ... 3 FUNCTION SELECT When the SET UP mode is entered the Analyzer will automatically display the last set up function selected To select other functions operate the FUNCTION button to increment to the next function or FUNCTION to decrement to the previous function 5 4 ENTER OPTION OR VALUE A Options To step through the available options for each function press the OPTION or OPTION buttons When the r...

Page 31: ...for the real time clock calender 4 Real time clock hour Options Select the current hour for the real time clock 24 hour format 5 Real time clock minutes Options Select the current minutes for the real time clock 6 Reference voltage 1 about 27 5 mV s Options Set the value of the reference voltage as read on a 3 3 4 digit multimeter See Section 6 2 for further details 27 55 mV 7 Reference voltage 2 ...

Page 32: ...mode in millivolts on the lower line Enter the SENSOR OFFSET value eg if offset value is 1 2 mV enter 1 2 mV The typical maximum is 3 mV If the manual entry method is being used make sure that NO to automatic entry is selected in set up step 10 or the manual value will be over written A new EMF offset must be entered whenever a new oxygen sensor is installed to calibrate for any offset an individu...

Page 33: ...ivolt generator Read the output of channel 1 with a three and a half digit multimeter ie The output should be 20mA Your meter could read 19 65mA In this case as the full scale current is low increase the calibration factor by about 1 ie Enter 101 0 Press AUTOCAL before leaving the set up mode A more accurate way determining the correct factor using the same example 20 00 to 19 65 0 35 0 35 19 65 1...

Page 34: ...ucing oxygen 6 Oxygen sensor EMF 24 TRANSMITTER ZERO CHANNEL 2 The output zero and span of Channel 2 is set in set up steps 24 and 25 Range limits are shown below 25 TRANSMITTER SPAN CHANNEL 2 Output Zero Range Span Range Minium span SAMPLE GAS OXYGEN 0 0 to 99 9 0 1 to 100 0 1 LOW OXYGEN 0 0 to 99 9 0 1 to 100 0 1 LOG OXYGEN 0 1 oxygen fixed 20 oxygen fixed see Note 1 CARBON DIOXIDE 0 to 80 20 to...

Page 35: ...d If the value in set up 38 Reset Level is above 20 9 and if a sample hold mode Fast Sample or Display Sample is selected here the oxygen peak not valley will be held as the sample If the carbon dioxide module is installed the peak of carbon dioxide will still be held Set up step 57 Damping Factor will only be used if Continuous is selected here 27 DISPLAY MODE Options 1 Oxygen 2 ppm 3 O2 CO2 only...

Page 36: ...ion checking or not Options No Cal Gas Yes During the timed calibration check periods the transmitter outputs will be frozen and the Analyzer will alarm if readings are not within the accuracy limits sets in set up steps 33 and 34 If autocal is not required enter NO CAL GAS and the transmitter will step to set up 30 31 FIRST CALIBRATION CHECK Set the time of day that best suits to start the auto c...

Page 37: ...ET LEVEL The RESET level is the trip level which triggers the sampling mode capture of the oxygen level By setting the reset level below 20 9 the Analyzer will capture a minimum oxygen level By setting the reset level above 20 9 the Analyzer will capture a maxiimum oxygen level In order to detect a new SAMPLE oxygen or carbon dioxide level the oxygen reset threshold must be set below or above for ...

Page 38: ...cation link screw terminals 14 15 This will automatically select the alarm range from 0 1 to 30 ppm If the measured oxygen level falls below the alarm level the alarm message will be Filter Fail Range 0 1 30 oxygen The default setting is 1 5 oxygen 0 1 30 ppm With screw terminals 14 15 linked 44 VERY LOW OXYGEN DELAY only available if Continuous is selected in Set up 26 Set the very low oxygen ala...

Page 39: ...log Seconds today Oxygen sensor EMF Oxygen level Carbon dioxide level The data log period can be set from 5 seconds to 1200 seconds 20 minutes Options 1 Printer 2 Data logger 53 DATA TO PRINT Any or all of the following values may be printed on a printer or computer connected to the serial port They may be selected or de selected using the ENTER buttons as in set up step 29 The log period follows ...

Page 40: ...he oxygen sensor the new reading is averaged with the last readings taken before the new average is either displayed on the LCD or sent to the 4 to 20 mA output The number of readings that are averaged together is adjustable with this function A value of five for example means that the new reading from the sensor and the previous four readings are averaged together before being displayed A value o...

Page 41: ...N 6 4 PUMP REPLACEMENT 6 5 BACK TO UP BATTERY REPLACEMENT 6 6 ELECTRONIC REPAIRS SENSOR MAINTENANCE 6 7 TEST EQUIPMENT REQUIRED 6 8 TESTING AN OXYGEN SENSOR 6 9 OXYGEN SENSOR THERMOCOUPLE 6 10 OXYGEN SENSOR HEATER FAILURE 6 11 CO2 OPTICAL SERVICE Teledyne Analytical Instruments 9070 Oxygen Analyzer Page 41 ...

Page 42: ...Wa y 1 6Wa y The Analyzer maintains its accuracy over a very long by continuously checking itself against internal stabilised references The only calibration required is to set the actual values of these references into battery backed memory The Analyzer will read these references every minute and update its zero and span correction factors See Section 5 5 6 to 9 These references should be checked...

Page 43: ...nt to measure sensor EMF and temperature is required A 3 1 2 or 4 1 2 digit multimeter will perform both measurements A separate temperature indicator to suit the sensor K type thermocouple is also useful although not necessary A cylinder of calibration gas is required eg 2 0 oxygen in nitrogen The cylinder should have a pressure and flow regulator Both of these are inexpensive devices available f...

Page 44: ...R THERMOCOUPLE The oxygen sensor is fitted with a K type thermocouple to measure the temperature of the oxygen sensor This temperature is used in the calculation of oxygen and the control of the heater The Analyzer has an alarm function which will advise the operator of an open circuit thermocouple however bench testing can be performed by simply measuring the thermocouple continuity 6 10 HEATER F...

Page 45: ...APPENDICES 1 OXYGEN SENSOR EMF TABLE 2 OXYGEN SCALE TO LOGARITHMIC 3 SAMPLE LOG PRINT OUTS 4 CIRCUIT SCHEMATICS Teledyne Analytical Instruments 9070 Oxygen Analyzer Page 45 ...

Page 46: ...0 131 5 12 5 11 05 400 134 0 12 0 11 92 350 136 9 11 5 12 83 300 140 2 11 0 13 78 250 144 1 10 5 14 78 200 148 8 10 0 15 82 150 155 0 9 5 16 92 100 163 7 9 0 18 08 50 178 5 8 5 19 30 40 183 3 8 0 20 60 30 189 4 7 5 21 98 20 198 1 7 0 23 45 10 212 9 6 5 25 04 6 0 26 75 5 5 28 61 5 0 30 65 4 5 32 90 4 0 35 42 3 5 38 28 3 0 41 58 2 5 45 48 2 0 50 25 1 5 56 41 1 0 65 08 0 5 79 91 0 2 99 51 0 1 114 39 ...

Page 47: ...IC OXYGEN FULL SCALE 0 1 0 0 15 7 66 0 2 13 1 0 3 20 7 0 4 26 2 0 6 33 8 0 8 39 2 1 43 5 1 5 51 1 2 56 5 3 64 2 4 69 6 6 77 3 8 82 7 10 86 9 12 90 8 14 93 3 16 95 8 18 98 20 100 Teledyne Analytical Instruments 9070 Oxygen Analyzer Page 47 ...

Page 48: ... 67 Next Print at 14 30 30 21 02 1996 Sample log print out using Printer mode Section 5 5 48 set up 52 61559 15 2 10 130 0 61575 15 2 10 130 0 61591 15 2 10 131 0 61607 15 2 10 131 0 61623 15 2 10 130 0 61639 15 2 10 131 0 61656 15 2 10 131 0 61672 15 2 10 130 0 Sample log print out using Logger mode Section 5 5 48 set up 52 Seconds today oxygen sensor EMF Oxygen Carbon dioxide Page 48 Teledyne An...

Page 49: ...APPENDIX 4 CIRCUIT SCHEMATICS Teledyne Analytical Instruments 9070 Oxygen Analyzer Page 49 ...

Page 50: ...1 Step 27 set up changed to include peak hold Set up 39 changed to include peak hold 29 01 98 January 1998 Added page 2 3 quick start pages Added a note about RS232 and the 9070 5 to page 14 Updated the carbon dioxide calibration in chapter 3 Removed quick span calibration Updated the alarm list on page 25 Updated the set up menu and numbering 18 05 98 May 1998 Removed the 30 and quick span commen...

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