Teledyne 310 User's Manual
Contents
1. F2 21304 0821 SHL TWASNI HO 3AOW3H Q3SN 1804 553223 7732 ONULLIS HO 38 AV S IGWVS NMMHOHIIA 51 ATWILVNOLIV 535012 1WHL SATIVA Sd 0LNKS SIHNLVIJ SNiLll4 HOVE SONILLIJ 3 1SNVS MO TI39VAS 123NNO2SI 73504 3411221084 1 N3WDHASNI SSINVdWO2OY 4 DNLIVW 1H 09 06 Asel goll A 321143038 Y3MOS 1 e3univsd IVNBILXA OL SS335v A u3roOisno HOJ didis BBYHL 3o H3N31SV4 Nunl 3SV9 99 Il 28 X ZA 89 61 11 2 iBINO 39NVH2 89 1 1 03112348 3S MUSHIO IINVETIQL SIS3H31SAH 9 0 AOVED2OY 6 0 ALALUSNIS 318 21144 S23dS SNIMOTIO SISIX3 ABLINGUID SISAIWHY N33A138 NOLLOVHSINI ON NOILVUZJO AY128 SNINH3130 OL 20 NOILIZS NOILVINIdAW 33s NOLLSHJSIG SUSWOLSNI 3Hi 135 MOl38 Q32Zi9U3N3 SAVIZU SALLINGNI G Q31VU SLOVINOD Aviad 5391130 OCO I NENA OF SWIG I0BlNOJ G3ddINOI wig QILVIDOSSV JO 9NILI3S AS Q3NIMH3130 Si LHIOd priv 1NIOd 13S 535594 NOIIVEINSJNO22. o o o 4 1 Routine Maintenance e e e e s o 4 2 Cell Replacement s ce 4 3 Cell Warranty e e o e 2 TECHNICAL INFORMATION o o o o o s e o 5 1 Transduction and Temperature Compensation 5 2 Output Circuit e e s e o 5 3 Alarm Comparator Circuit a o a e SPECIFICATION DATA o a o gt 6 1 TAT Sales Order Number s o a e o gt 6 2 Instrument Model Number o 4 6 3 Instrument Serial Number e s e 6 4 Micro Fuel Call Class e a se s s a 6 5 Accuracy 2 6 6 Operating Temperature Range e e e PORTING EQUIPMENT AND SERVICES e a UJ Ny MJ fO ES p Ui tn 15 15 15 15 15 15 TABLE OF CONTENTS Cont 7 Response and Recovery 8 Output Signal 9 Ranges of Analysis 10 Recommended Span Gas 11 Alarm Set Point 1 n 12 Alarm Set Point 2 2 Mo ACCESSORIES IF APPLICABLE DRAWING LIST RECOMMENDED SPARE PARTS LIST 1 INTRODUCTION 1 1 Method of Analvsis The Teledvne Analvtical Instruments TAI Series 310 Portable Trace Oxygen Analyzer utilizes a unique patented micro fuel cell to electro chemically measure the concentration of oxygen in a gas stream The cell has an absolute zero and broduces
3. 0 Sv V S3LVILLOV ABIInQHIO SHLAULINDUID PISVIV IVEDZINI 3HDIV34 2 01 GNV OE S1300W 72 ANIHHUXZIS NO 8 vx3ovsva 9 H3lJV MI IVIQZWHU SV9 N39AXO YO JOHINOI NVAS XOO18H 31V2S H313H NO XHYW IVI 0 NI SI UBINIOd H313W JHL WINN LI 1 NVdS SHI NIONA S3Z1UGVIS LI N3HA ONIOV3H YILIN BLON 3 nL DI1SV Id NO 9NIXINS AB LN3WOHISNI OLN MILHID 1804 U3H1O JILSVIA ONY LHOd Stays BNO NI N3dO NV TIVLSNI HOLISOS VI 39NYY 32V d 3 IAWVS NY INZWNYISAI 01 FTLLOBHL HO MOLY TORY V NYI 3HnsS38d WNSIS 109100 NV 3univ34 INIWA LSNI 30 SIZQOW TIY 1 000701 40 32NvG3dNl 104 NV KLA 33130 Y SNIAISQ BOS 3T8VlinS SI IVNDIS 1 0 SI 1 41 031419395 ISIMHIHIO SSJTHN 50040 104100 59 NOLLVBBNIVI 1 12345 Y QISN 138340 OL N39AXO 906 02 NOILISOd NV SIKNIVIJ 54345 30V230 NI NIDAXO 1 0 MddOI O WONA JO S39HVH SISKIVHW HILMS HO1LI373S 39NVH 579 NVAS 7412395 LNOHLIM QaivuBhiv2 38
4. AVW INSWDUISNI JHL iV DIVZHASOMAY 83134 IYD HILIMS 29NY8 3H1 30 NOILISOJ SHL DHISN N39AXO 40 NOILLVELN32NO2 NMONX Y 1SNIVOY 5 SZKIBVONVIS OL Q350 10H1NO2 ANO Z QIE 1300 18N 135 WUWIV SV SIUNIVES 3WVS 7224 ANIOS 135 Muy Tv ANNO 2 Oi 3008 4H911 ONILVJIONI 25H ANIOd 135 ZOE 81 016 sT300W AHO REV TY INIIVJIONI 159 1NIOd 135 WUVTV SEV IWAY JaN ANIOS 135 WUVIW H313W DNILVOIONI o 506 0 4330 8 5 5 SI ININAHISNI 318 150 0 ANIN 2 06 B 1 01 SIZQON 71132 ONIZIUNSSI8A SQUNOS LIINNOISIO ZIA VS ONV ISHId LISNNOJ 1 SISKIVNV 40 SdWVS 31 HIN SHSIT100O1TO 38 Q INOHS 31VHMO Id AINVUYVA JHL GIOA ONY 1 JOV VO SHI ONY 9NILLIJ NAHM ONILI S310N iVNOILVE3dO INVISOGNI Dd Er I n A tr f P ac ity Ble LIE gie ov s KW uod sa WSO VIC NOILLVITIVASNI SLINIVIO v amp vav HLIM SINIVANLSNI Hi HINO CuwvOoW EE q3UVOd 3722
5. cell to TAI for replace ment DO NOT DISTURB THE CELL PACKAGE If the cell package is intact TAI will replace the cell at no cost No tools are required to replace the cell in the instrument Simply unscrew ccw the plug at the bottom of the analyzer and the cell will drop out of the manifold cavity Remove the new cell from its package and carefully remove the shorting clip and the paper sticker that is in place over the sensing surface of the cell Do not touch the gold colored sensing surface of the cell as it is covered with a delicate teflon membrane that can be ruptured in handling Place the cell on the end of the manifold plug so that the sensing surface of the cell is in contact with the plug and the electrical contact plate end of the cell is facing upwards Insert the cell and plug in the manifold cavity and screw the plug back into place Apply as much pressure as you can with your fingers but use no tools After the cell has been installed purge the instrument 2405 with inert gas or the sample and then proceed as directed in Section 3 2 1 4 3 Cell Warrantv The Class B 2 cell employed in the Series 310 is warranted for 60 000 percent hours or six 6 months of service whichever occurs first With regard to spare cells service time starts when the cell is removed from its shipping package The customer should stock only one spare cell per instrument at a time Do not attempt to stockpile spa
6. in the mani fold assembly is indicated TO EXTEND CELL LIFE AND MINIMIZE THE TIME REOUIRED TO MAKE THE NEXT ANALYSIS THE INSTRUMENT SHOULD ALWAYS BE PURGED WITH THE SAMPLE OR AN INERT GAS PRIOR TO BEING TAKEN OUT OF SERVICE FOR STANDBY OR STORAGE 3 2 Calibration The inherentiv constant output of the cell during its useful life precludes a definitive calibration cycle TAI feels that the interval between calibrations should be dictated by the customer s application If the instrument is being used to certify the oxygen content of a product for delivery then a calibration prior to certification would certainly be in order If on other hand the instrument is being used to monitor or guard a sample for predetermined limits of acceptability the customer s knowledge of that sample and the evidence provided by the analyzer will in themselves determine when a calibration check is in order DO NOT CALIBRATE THE INSTRUMENT UNLESS THERE IS A TRACE OXYGEN GAS READILY AVAILABLE FOR PURGING IMMEDIATELY FOLLOW ING THE CALIBRATION PROCEDURE 3 2 1 Calibration Procedure Employ the following step by step procedure to calibrate the instrument 1 Stand the instrument upright on a level surface and with the range switch in the OFF position check the alignment of the meter pointer with the zero mark on the scale Use the mirror to eliminate parallex and adjust the screw on the face of the meter if nec
7. slightly negative a sample pump will be required downstream from the analyzer The inlet side of the pump should also be equipped with a throttle valve so that sample flow can be reduced to between 0 1 and 10 liters min If pump loadi g is a consideration the inlet side of the pump will have to include a bypass path that is open to the atmosphere through still another throttle valve The sample path and bypass path may then be balanced by manipulating the two valves so that the sample flow is within the prescribed limits without loading the pump UNDER NO CIRCUMS TANCES SHOULD THERE BE ANY RESTRICTIONS IN THE LINE BETWEEN THE SAMPLE POINT AND THE ANALYZER as a partial vacuum would then be drawn on the cell Since the cell is a partial pressure sensitive device any oxygen readings taken under these conditions would be erroneous 4 MAINTENANCE 4 1 Routine Maintenance Ho routine periodic mainten anace is required The only moving parts contained in the analyzer are the meter movement and the plug in relay or relays The micro fuel cell is a sealed modular component that can only be replaced when at fault 4 2 Cell Replacement The characteristics of the micro fuel cell are similar to those of a nickel cadmium battery in that both provide an almost constant output through their useful life and then fall off sharply towards zero at the end If the sample being analyzed has low Xl range oxygen concentration cell failu
8. 0 in 60 seconds on the Xl range 6 8 Output Signal 6 9 Ranges of Analysis 0 10 ppm Oxygen 0 100 ppm Oxygen X100 0 1 000 ppm Oxygen X1000 0 10 000 ppm Oxygen 6 10 Recommended Span Gas Atmospheric air 6 11 Alarm Set Point 1 6 12 Alarm Set Point 2 zt pe s TAL SERIES 310 ka U RECOMMENDED SPARE_PARTS LIST QUANTITY PART NO DESCRIPTION 58 179 Relav PSB KHP17D11 24V 2 F 51 eens 5 Amp 2 L 32 Lamp G E 327 1 6689 Micro Fuel Cell Class B 2 sala beart xe x 1411 34 Delany power Steg phy AS et luce el Used in Models 310 1 and 310 2 only A minimum charge of 52000 applies to all spare part orders IMPORTANT Orders for spare parts must include the model serial numbers 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 818 961 9221 213 283 7181 TWX 910 584 1887 TDYANYL COID DRAWING LIST MODEL 310 B 8929 OUTLINE DIAGRAM A 14138 9 CELL DELAY INSTALLATION DIAGRAM C 8998 SCHEMA TIC WVYOVIG IVIHOLJIA Ole 544435 S uq IRSILA YAZATVNY N39AXO 30981 3ISVLHOd VN3QVSVd GR CINI 3HAG3131 HOISINIO Y 3wos SLNJWNYLSNI TVOLLATVNV JNAGITAL urine tor
9. 3 External Signal All models of the Series 310 are equipped to provide an output signal The magnitude of the available signal can be preset by TAI from 0 1 millivolt DC full scale to 0 1 volt DC full scale and should be specified by the customer at the time of purchase Unless otherwise specified the output will be 0 1 volt DC Refer to the Specification Data Section of the Manual to deter mine the output signal magnitude The output signal regardless of magnitude is suitable for driving external devices that have an input impedance of 10 000 ohms or more Two conductor shielded cable is recommended for interconnection purposes particularly for those instruments whose output signal magnitude is in the lower millivolt range Polarize the sig nal connections as shown on the Pictorial Diagram and connect the shield at the external readout device only 2 4 External Alarms Models 310 1 and 310 2 feature integral adjustable alarm control circuits see Section 1 3 1 for des criptive information The form C contacts normally closed common normally open of the relay or relays are electrically terminated on the rear terminal strip In order to properly use the SPDT switch that these contacts represent the customer must first ascer tain when the relay or relays is energized above or below set point When applicable this information will be found documented in the Specification Data section of the manual The appr
10. Circuitry One Model 310 1 or two Model 310 2 independently adjustable control circuits are available as an accessorv option Control over an external circuit is achieved bv a relav whose solenoid coil is operated by an electronic comparator cir cuit The switch contacts of the felav are interconnected with the customer s circuit on the terminal strip at the rear of the instrument The control point at which the relay operates is determined by the setting of a dial equipped potentiometer on the control panel The linearity of the oxygen signal and 10 turn set point potentiometer plus the resolution 1 000 discrete divisions of the turns counting control dial provides precise monitoring of any oxygen concentration within the range capability of the analyzer The decade nature of the ranges of analysis and the set point dial permits the user to set his control by simply dialing the control until it reads the desired oxygen level The only mental calculation required is the proper placement of the decimal point as the meter scale has 100 divisions and the control dial 1 000 plus allowances must be made for the fact that relay action will occur at the same spot on the scale regardless of range switch position The integral control circuitry can be arranged so that the relay is energized either above or below the set point Unless otherwise specified the control relay in a single set point instrument Model 310 1 will be energize
11. INSTRUCTION MANUAL FOR TRACE OXXGEN ANALYZER MODEL 310 SERIAL NUMBER RANGES 0 10 100 1000 10 000 PPM OXYGEN CUSTOMER ORDER NUMBER SALES ORDER NUMBER TELEDYNE ANALYTICAL INSTRUMENTS 16830 Chestnut Street City of Industry Ca 91748 213 961 9221 213 283 7181 TWX 910 584 1887 TDYANYL COID TABLE OF CONTENTS INTRODUCTION e o o 1 1 Method of Analysis a 1 2 Standard Features e s gt e e 1 2 1 Micro Fuel Cell e s e a o 2 Temperature Compensation e ta 20 3 Meter Readout e e o 4 Output Signal ee 5 Multiple Ranges of Analysis 6 Speed of Response o 7 1 PREP ee Compact Packaging nal Feature s e s s s n s 2 25 m 2 2 ti 3 Integral Alarm Circuitry Ee UP 1 Power Service e ee we os 2 Sampling Equipment e es s 0 3 External Signal s s s 4 External 5 SU 2 2 2 2 OPERATION o o o 3 1 Introduction ee wo 4 BB 2 5 ee ie 3 2 1 Calibration Procedure 3 3 Positive Pressure Sampling 3 4 Atmospheric Pressure Sampling MAINTENANCE
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13. Series 310 utilizes a thermistor controlled temperature compensation circuit to maintain 5 of reading or 2 of scale accuracy whichever is greater over the operating temperature range 30 to 125 F the compensation approach rather than temperature control method provides acceptable accuracy over a wide range of ambient temperature fluctuation and eliminates the maintenance problems that normally accompanv the components associated with an electrical heating system 1 2 3 Meter Readout The Series 310 is equipped with an exceptionally accurate 0 5 inearity panel meter for direct readout of the analysis A linear 100 division scale mirror equipped to eliminate parallex promotes reliable accurate readout of the analysis at any point on the scale The resolution and accuracy of the instrument s meter obviates the necessity of an accessory readout device unless a permanent recording of the analysis is required Integral single and double alarm circuitry see optional feature is also available 1 2 4 Output Signal For those applications requiring a continuous recording of the oxygen content of the sample a linear output signal of from 0 1 millivolt to 0 1 volt D C is available at no extra charge Unless otherwise specified at the time of purchase the output signal will be 0 1 volt D C The output signal regardless of magnitude is suitable for driving external devices that have an input impedance o
14. a linear output from the low parts per million ppm level through 21 210 000 ppm oxygen When coupled with a state of the art two stage amplifier system that incorporates a hybrid tional amplifier and an integrated circuit IC the cell provides linear trace oxygen analysis in the ranges of 0 10 0 100 0 1 000 and 0 10 000 ppm No zero gas is required and the instrument may be calibrated with air obviating the use of questionable certified trace oxygen calibration gases 1 2 Standard Features The following outstanding features are incorporated in the Series 310 Portable Trace Oxvgen Analyzer line 1 2 1 Micro Fuel Cell The Series 310 sets a new stendard in maintenance free operation The micro fuel cell is a sealed electrochemical transducer with no electrolyte to change or electrodes to clean When the cell reaches the end of its useful life 6 months minimum it is merely thrown away and replaced as one would replace a battery in a flash light The cell is specific for oxvgen and is not influenced bv sample flow rate or the presence of reducing agents such as hydro caxbons SO etc When a nominal flowrate of 0 25 scfh approximately 50 cc min maintained through the instrument the response time is 90 in less than 10 seconds for most ranges The instrument can also be installed a glove box to provide ppm oxygen analysis by diffusion sampling only 1 2 2 Temperature Compensation The
15. available full scale voltage presented by the oxygen measuring circuit TAI gt is able to provide highly accurate alarm control circuitry as an option see Section 1 3 1 The l0 turn set point potentiometers and of the circuit are powered from a secondary power supply that also has been adjusted trimmer R34 so that precisely 1 volt appears across the potentio meters comparison of the signal magnitudes being received from the potentiometers and the oxygen amplifier is then made by the differential amplifiers A3 and A4 in the alarm relay control circuits As the oxygen signal level passes through coincidence 13 with the signal being received from the potentiometers the transistors 09 and 010 energize or de energize the switching relays K2 K3 circuit can be configured so that either relay will operate above or below set point by transposing the signals at the inverting and non inverting inputs of the differ ential amplifier A 6 SPECIFICATION DATA 6 1 TAI Sales Order Number 6 2 Instrument Model Number 310 6 3 Instrument Serial Number 6 4 Micro fuel Cell Class 6 5 Accuracy 2 of scale at constant temperature t 2 of scale or t 5 of reading whichever is greater over the operating temperature range 6 6 Operating Temperature Range 30 to 125 F 6 7 Response and Recovery At the specified flowrate 0 25 scfh 90 in 10 seconds on the X10 X100 and X1000 ranges and 9
16. d below the set point and the relays in a double set point instrument Model 310 2 will be energized when the oxygen level is reading above set point 1 and below set point 2 Each alarm relay energizes a red indicator light that is associated with its respective set point Normally see pre vious paragraph the light illuminates when its respective relay is in a de energized condition set point exceeded 2 SUPPORTING EQUIPMENT AND SERVICES 2 1 Power Service A source of single phase 105 to 125 volt 50 or 60 cycle power capable of delivering a 1 4 ampere of current continuously is required to operate the Series 310 analyzer The analvzer is supplied with UAL approved 3 wire detach able power cord Under no circumstances bypass the ground lead of the cord Aside from eliminating personnel short circuit protection bypassing the ground wire will deprive the instruments electronic circuitry of an earth ground reference which could lead to erratic unreliable per formance ae 2 2 Sampling Equipment The customer must provide the necessary flow control hardware for positive pressure applications TAI suggests a simple throttle valve installed in the sample line between the sample point and the analyzer The flowrate should be limited to between 0 1 and 10 liters min for atmospheric pressure sampling connect a pump down Stream from the analyzer and draw rather than push the sample through the instrument 2
17. essary until the pointer and zero mark are in precise coincidence 2 Advance the range switch to the CAL position 3 Install the plastic tube equipped male disconnect fitting in either of the analyzer s sample ports and a blank disconnect fitting in the other port direction of sample flow is of no importance Gentiv suck do not blow on the plastic tube and observe the meter reading Continue to suck on the tube until the meter reading is stable 4 Unlock and adjust the span control until the meter pointer is in coincidence with the CAL mark on the meter scale SURE TO RELOCK THE CONTROL AFTER THE ADJUSTMENT iS MADE 5 Immediately after step 4 has been accomplished dis connect the tubing equipped calibration fitting and plug in either the sample or a source of inert gas ES If the instrument is to be used for sampling after the calibration procedure has been completed follow the decreas ing oxvgen reading bv positioning the range switch so that the meter gives the best possible resolution of the oxvgen NOT ATTEMPT TO ACTUALLY TAKE A READING UNTIL THE METER INDICATION STABILIZES the sample oxygen content lies within the limits of the range 0 10 ppm it will take about fifteen minutes for the instrument to recover suffi cientiv from the effects of the 209 000 ppm oxygen concen tration of air over four decades of range differential Recovery time is proportionally less for coarser range
18. f 10 000 ohms or more 1 2 5 Multiple Ranges of Analysis The Series 310 accurately measures oxygen concentrations from 0 10 ppm to 0 10 000 ppm full scale Range adjustment is decade steps and is accomplished by the positioning of a selector switch Each range of analysis is identified by the multiply ing factor that is to be applied to the basic 10 major divisions of the integral meter scale i e Xl would be 0 10 ppm oxygen full scale X10 0 100 ppm oxygen and so on In addition a CAL position is provided to extend the range of measurement to include the oxygen concentration of air With the selector in this position the instrument may be accurately calibrated by drawing air through the cell manifold and using the CAL mark on the meter dial to set the span control 1 2 6 Speed of Response With a sample flowrate of 0 25 scfh the Series 310 achieves 90 response in 10 seconds to full scale changes in oxygen concentration in the X10 X100 and X1000 ranges In the Xl range 90 response is realized in 30 seconds In general the response of the micro fuel cell is significantly superior to that of most portable electro chemical trace oxygen measuring systems currently on the market 1 2 7 Compact Packaging The analyzer is housed in an aluminum case that is equipped with a carrying handle for easy portability When in use the analyzer should be placed in an upright position on a level surface off level position
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20. ing will detract from the meter accuracy Access to the instrument components is gained by loosening the three 3 quarter turn fasteners on the back of the outer case The outer case may then be detached from the control panel The instrument may be further disassembled by first removing the back plate assembly and then the printed circuit board or boards from their respective standoffs These assemblies may be removed without disturbing the integral wiring The disassembled units then lay out as pictured on the Analyzer Wiring Diagram which is included among the drawings at the rear of the manual The instrument is equipped with two 2 quick disconnect type tubing fittings each of which features an integral shutoff valve that automatically closes when its mating fitting is disengaged The fittings are an integral part of the micro fuel cell manifold and project through the rear of the instru ment also provides three 3 male fittings for the instrument one of which is equipped with a plastic tube The tubing equipped fitting is used to draw air through the instrument for calibration purposes See Section 3 of the manual An eight foot detachable power cord is also furnished with the analyzer 1 3 Optional Feature The basic Model 310 analyzer in corporates all the standard features listed in Section 1 2 of the manual The following optional feature is also available upon request 1 3 1 Integral Alarm
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22. opriate terminal strip connections for both models are identified on the Pictorial Diagram The load current of the circuit being controlled by either of the set point relays should be no greater than 5 amperes non inductive 3 OPERATION 3 1 Introduction The Series 310 is supplied completely assembled and ready for instant use The micro fuel 11 is in place within the manifold and prior to shipment the mani fold vas purged with an inert gas to eliminate all but traces of oxygen from the internal sampling system The integral shutoff valves in the quick disconnect sample fittings if not disturbed will maintain this inert atmosphere within the manifold indefinitely This can be demonstrated by connecting the power cord and advancing the range selector switch to the X100 0 1 000 ppm position When the range selector is advanced from the OFF position power to the instruments circuitry is established The meter may drive downscale off the zero mark momentarily when power is first applied but will move upscale and come to balance shortly thereafter It is impossible to achieve a perfect seal of the internal sample system and what the meter is indicating is the diffu sion consumption balance point of internal sample system and the micro fuel cell This balance point with a properly calibrated instrument is always within the limits of the X100 range If the read ing climbs off the limits of this scale a leak
23. osure will extend life In general the CO effect is cumula tive and the average CO concentration should be used to find fne predicted cell life Cells can be used to make spot check measurements of O in the presence of high concentratiofis of CO up to 50 and more The CO containing sample should be purged o t as soon as a constant reading is obtained Abnormally slow response and recovery is characteristic of cells operated as indicated in notes 1 2 and 3 The reduction in cell life is primarily due to a drop in output This reduces to a point where the instrument can no longer be spanned Instruments using B 2 cells in CO atmospheres should be spanned more fr quently at intervals 10 20 of the predicted life The co effect on B 2 celis is indepen dent of the O level The reduction in cell life due to their being used in CO atmospheres is therefore limit ing a d takes precedent over the normal warranty 157 ET 18 LL Hd ri Ed LEE 8 12 16 20 Predicted Weeks of Cell Life a dei Bu AES DE chemically to produce an electrical current that is proportional to the oxygen concentration in the gas phase immediately adjacent to the cells sensing surface The cell has an inherent positive temperature coefficient
24. re cells The Series 310 should not be used in applications where CO is a major component in the sample Concentrations of 1 000 ppm or less will not effect the cell performance The follow ing page is a graph showing the effects of CO on cell life if cell was working satisfactorily but ceases to function before the warranty period expires the customer will receive credit on a pro rated basis toward the purchase of a new cell Customers having warranty claims must return the cell in ques tion to the factory for evaluation If it is determined that failure is due to faulty workmanship or material the cell will be replaced at no cost to the customer WARNING Evidence of damage due to tampering or mishandling will render the cell warranty null and void 5 TECHNICAL INFORMATION 5 1 Transduction and Temperature Compensation The TAI Series 310 Trace Oxygen Analyzer utilizes a unique electro chemical transducer whose features include 1 Specificity for oxygen 2 Maintenance operation 3 Long calibration interval and life 4 Disposable configuration 5 Low cost The transducer functions as a fuel cell in this instance the fuel is oxygen Oxygen diffusing into the cell reacts ex RLO NOTES 2 EFFECT OF eo ON 2 CELL bifh This curve assumes continuous exposure Intermittant exp
25. re will probably be indicated by the inability to properly calibrate the analyzer The user will find that very little adjustment of the 10 turn span potentiometer will be required to keep the analyzer calibrated properly during the duration of a given cell s useful life If large many turn adjustments cw are required to calibrate the instrument or calibration cannot be achieved within the range of the control the cell should be immediately replaced To offset the possibility of not having a replacement cell available when it is needed TAL recommends that a spare cell be purchased shortiv after the instrument is placed in service and each time the cell is replaced thereafter The spare cell should be carefullv stored in an area that is not subject to large variations if ambient temperature 759 F nominal and in such a way as to obviate any possi bilitv of incurring damage Under no circumstances dis turb the integrity of the cell package until the cell is to be actuallv used the cell package is punctured and air permitted to enter the cell will immediately start to re act to the presence of oxygen Packaged spare cells are equipped with a removable shorting clip While in storage the cell should be inspected period ically for electrolyte leakage If a cell is leaking the shorting clip will turn black in color and in severe cases actually break into several pieces If either of these symptoms are detected return the
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27. s If on the other hand the instrument is not to be used immediately after calibration and a low ppm oxygen gas is being employed as a purge allow the reading to stabilize and then disconnect both male fittings ALWAYS DISCONNECT THE SOURCE FITTING FIRST AND IMMEDIATELY TEEREAFTER THE VENT FITTING 3 3 Positive Pressure Sampling When connecting the instrument to a positive pressure sample source ALWAYS proceed as follows 1 Before making any connections to the instrument establish a flowrate in the sample line of from 0 1 to 10 liters min Allow the sample to vent to atmosphere long enough to purge the line free of air 2 Install the vent fitting first and then the sample source fitting prepared to make the connections in rapid order so that atmospheric diffusion time through the vent fitting is held to a minimum When disconnecting the instrument reverse the procedure source fitting first and then vent fitting The objective of the connection disconnection procedure is to obviate the possibility of pressurizing the cell IF A FLOWING SAMPLE WAS CONNECTED TO THE MANIFOLD WITHOUT THE VENT FITTING IN PLACE THE PRESSURE IN THE MANIFOLD WOULD RISE AND BE EQUAL TO THE SAMPLE PRESSURE ALMOST IMMEDIATELY In such a situation depending on the magnitude of the sample pressure the cell could be permanentiy damaged 3 4 Atmospheric Pressure Sampling If the sample is at atmospheric pressure or
28. the effects of which have been minimized through the implementation of a calibrated thermistor compensation circuit The instrument is cycled through the operating temperature range 30 to 125 F and the value of resistor R21 see sofi matic will produce the advertised accuracy specification 2 of scale of t 5 of reading whichever is greater The reader should understand that the t 59 of reading specification is a derivative of the wide operating temperature range and that at a constant temperature the accuracy is 2 of scale This calibration is accomplished by TAI and under no circumstances should the setting of any circuit board trimmer be tampered with unless under the direct supervision of an authorized represen tative 5 2 Output Circuit The Series 310 output circuit meter alarm comparator and external signal has been designed so that when the instrument is properly calibrated precisely one 1 volt potential difference exists between the slider and ccw ter minal of the span potentiometer Pl when the full scale any range oxygen is being sensed by the cell TAI standardizes the output to within 0 5 mv DC with a differential volt meter and then adjusts the meter trimmer R18 so that is reads exactly full scale The output signal can be preset to meet the customer s requirement through the proper selection of a voltage divider R15 and R16 5 3 Alarm Comparator Circuit By standardizing the
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