Teledyne 315 User's Manual
Contents
1. cover plate and expended cell Remove the new cell from its package and carefully remove the shorting clip not touch the silver colored sensing surface of the cell as it is covered with a delicate Teflon membrane that can be ruptured in handling Place the new cell contact plate first into the cell manifold and replace the cover and screws After the cell h s been installed proceed as directed in Sections 3 4 and 3 5 of the Manual 5 3 Cell Warranty The Class 8 2 tell employed in the Model 315 is warranted for 40 000 percent hours or six 6 months of service whiever occurs first With regard to spare cells service time starts when the cell is removed from its shipping package customer should stock only one spare cell per instrument at a time Do not attempt to stockpile spare cells The Model 315 should not be used in applications where CO is a Maj X component in the sample C onc amp Hntrations of 1 000 ppm or less will not effect the cell performance If a cell was working satisfaetorily 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 11 be replaced at no gost to the customer WARNING Evidence of d2. or calibratinn span gas into the analyzer The valves should be selected on the basis of their ability to completely seal when closed As an added precaution TAT suggests that the span gas be shut off at its source when not in use Such a procedure will obviate the possibility of span gas contamination of the sample 2 3 1 2 Recommended Span Gas The Model 315 has be n specifically designed to employ air as its calibra tion gas TAI feels that the known oxygen concentration of air 20 9 is the most reliable standard available The volum represented by the cell manifaia and sample passages has been reduced to a minimum so that the instrument will recover rapidly to Xl r nge 0 10 ppm analysis when the proper calibration procedure is followed 2 3 1 3 Pressure Reduction and or Requlation TAI recommends that the sample pressure be reduced at the sample point to between 5 and 50 psig 10 psig nominal If the magnitude of the sample pressure does not exceed 100 psig and is reasonably stable a simple throttle valve will be satisfactory If on the other hand the pressure is in excess of 100 psig or vacillates over a wide range a metallic diaphragm regulator should be employed DO NOT USE A REGULATOR THAT IS EQUIPPED WITH AN ORGANIC MATERIAL DIAPHRAGM UNDER ANY CIRCUM STANCES If the span gas is a certified composition its supply cylinder must also be equipped with a metallic diaphragm regulator If the span gas
3. supervision of an authorized TAI represen tative 6 2 Output Circuit Model 315 output circuit meter and oxternal signal has been designed so that when the instrument is properly calibrated precisely one 1 volt potential difference exists between the slider and terminal of the span potentio meter Pl when full scale any range oxygen is being sensed by the cell TAI standardizes the output to within t 0 5 mv DC with a differential volt meter and then adjusts the meter trimmer R18 so that 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 i2 1 SPECIFICATION DATA 7 1 TAI SALES ORDER NUMBER 7 2 INSTRUMENT MODEL NUMBER 315 7 3 INSTRUMENT SERIAL NUMBER 7 4 MICRO FUEL CELL CLASS 7 5 ACCURACY 2 OF SCALE AT CONSTANT TEMPERATURE 25 OF SCALE OR 5 OF READING WHICHEVER IS GREATER OVER THE OPERATING TEMPERATURE RANGE 7 6 OPERATING TEMPERATURE RANGE 32 to 1259 7 7 RESPONSE AND RECOVERY THE SPECIFIED FLOWRATE 0 25 SCFH 90 IN 10 SECONDS ON THE X10 RANGE AND 90 IN 60 SECONDS ON THE Xi RANGE 7 8 OUTPUT SIGNAL 7 9 RANGES OF ANALYSIS 7 10 RECOMMENDED SPAN GAS COMPRESSED AIR 13 QUANTITY 5 1 SERIES 315 RECOMMENDED SPARE PARTS LIST PART NO DESCRIPTION F 39 Micro fuse 1 4 6689 Micro fuel Cell
4. the terminal identified H neutral to the N terminal 3 4 An equipment ground wire of the same gauge as the power service nominally 16 ga is to be connected to the terminal identified on the interconnection diagram This connection must be made in order to give the electronic circuitry a proper earth ground reference as well as to provide proper short circuit protection for operating personnel 2 2 2 Signal The Model 315 is 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 determine 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 purpos s particularly for those instruments whose output sig nal magnitude is in the lower millivolt range Polarize the signal connections as shown on the interconnection diagram and connect the shield at the analyzer only 2 3 Gas Connections The sample input and vent connections are 1 8 Swagelok and are located on the lower rear of the analyzer case Both are identified on the outline diagram TAL suggests that Te
5. Class 2 Orders for spare parts must include the model and serial numbers of the instrument for which the parts are intended Minimum Charge of 200 applies to Spare Parts Orders Orders should be sent to Teledyne Analytical Instruments 16830 Chestnut Street City of Industry CA 91748 1580 Phone 626 934 1500 Fax 626 961 2538 910 584 1887 COID Web www teledyne ai com 100V 50 60 Hz DRAWING LIST MODEL 315X B 11020 Analyzer Outline Diagram A 11019 Interconnection Diagram A 11026 Piping Schematic C 14270 Schematic 14141 02 Cell Delay Board Installation Diagram 4 HTG HOLES 3AG DIA POWER IN ve MILLIVOLT SIGNAL OUT A CONDUIT 200 96 109 UNT EEA e SAMPLE OUT 148 TUBE FITTINGS SAMPLE IN NOTE RECOMMENDED PANEL CUTOUT DIMENSIONS 10 1 8 X 313 16 THIS DRAWING 13 PROPERTY OF TELEDYNE ANALYTICAL INSTRUKEMTS AMD CONTAINS CONFIDENTIAL IFORXATIOQ FJA NOT YO DE REPRODUCED VSKO WITKOUT WRITTEN PERNIGSIOK 1 PRACT 1704 DEG 003 TOLERANCE UNLESS OTHERWISE SPECIFIED ANGULAR ER sanc 1920 7221 A TELEDYNE COMPANY 1 SAN GABRIEL CALIFORNIA TRACE QXXGEN ANALYZER 25 825 Ix een OQUTLINKSDIAGRAM B 11020 i SIGNAL OUT PO
6. INSTRUCTION MANUAL FOR OXYGEN ANALYZER MODEL 315 SERIAL NUMBER Teledyne Analytical Instruments 16830 Chestnut Street City of Industry CA 91749 1580 Phone 626 934 1500 Fax 626 961 2538 910 584 1887 TDYANLY COID Web www teledyne ai com e MATERIAL SAFETY DATA SHEET Section I Product Identification Product Name Micro Fuel Cells all classes execpt A 2 A 3 A 5 B 2F and B 2CF Electrochemical Oxygen Sensors all Classes execpt R 19 Mini micro fuel cells all classes Manufacturer Teledyne Analytical Instruments Address 16830 Chestnut Street City of Industry CA 91749 Phone Number 818 961 9221 MSDS Prepared By Chuck Molloy Date Prepared Or Last Revised 3 31 88 Emergency Phone No 818 961 9221 Section II Physical and Chemical Data Chemical and Common Names Potassium Hydroxide KOH 15 Granular Lead Pb pure CAS Number 1310 58 3 Pb 7439 92 1 Melting Point Range 10 to 0 Deg Boiling Point Range 1 to 115 Deg Specific Gravity 1 09 820 Deg C pH gt 14 Solubility in Water Completely soluble Percent Volatiles by Volume None Appearance and Odor Colorless odorless solution Section III Physical Hazards Potential for Fire and Explosion electrolyte in micro fuel cells is not flammable There are no fire or explosion hazards associated with micro fuel cells Potential for Reactivity The sensors are stable under normal con
7. NSTRUMENTS 52270 cogetur SAN GABRIEL CALIFORNIA Wes TRACE OXYGEN ANALYZER MDL SCHEMATIC ISSUE NO APP i17 30 7 re REY NEDRAWN 2 4 7 70 Y ANALYZER BOARD ALARM BOARD 8 4 03 COLOR 20047 BK BLACK 6 Y 2 GAA Y THIS DRAWING 15 PROPERTY OF TELCOYME ANALYTICAL INSTRUMENTS ANO CONTAINS CONFIOLNTIAL INFORMATION IT 15 GN GREEN BL COPIED RUPRODUCED OR USEO WITHOUT WRITTEN PERMISSION 06 w ORANGE TOLCRANCC UNLESS OTHERWISE SPCCIFICO RO REO TELEDYNE ANALYTICAL INSTRUMENTS SAN GABRIEL CALIFORNIA Oa CELL DELAY BOARD INSTALLATION DIAG FOR MBL 315
8. WER IN GROUND SHIELD OF SIGNAL CABLE AT ANALYZER ONLY AS SHOWN DO NOT GROUND EITHER OUTPUT SIGNAL LEADS POWER amp SIGNAL LEAOS SHOULD BE PLACED IN SEPARATE CONDUITS WIRE RECOMMENDATIONS SIGNAL 22 GA SHIELDED CABLE POWER GROUND 16 G THIS DRAWING 15 THE PROPERTY OF TELEDYNE ANALYTICAL INSTRUMENTS ANO CONTAINS CONFIDENTIAL INFORMATION IT I ROT BE COPITO REPRODUCED OR USED WITHOUT WRITTEN PERMISSION b TOLERANCE UNLESS OTHERWISE SPECIFIED 1 64 DEG 005 ANGULAR LASA ANALYTICAL INSTRUMENTS temo pars 102176 TELEDYNE COMPANY SAN GABRIEL CALIFORNIA FINISH TRACE OXYGEN ANALYZER MDL 315 325 INTERCONNECTION DIAGRAM 11019 SAMPLE ISSUE NO 1 10 23 72 FLOWMETER SHUT OFF THROTTLE VALVE VALVE THIS DRAWING IS THE PROPERTY OF TELEOYNE ANALYTICAL INSTRUMENTS AND CONTAINS CONFIDENTIAL INFORMATION IT 15 YO BE REPRODUCED OR USED WITHOUT WAITTZN PERMISSION FOLCRANCE UNLESS OTHERWISE SPECIFIED I ANALYTICAL INSTRUMENTS YELEDYNT COMPANY SAN GABRIEL CALIFORNIA FINISH TRACE OXYGEN ANALYZER MDL 315 525 os mee PIPING SCHEMATIC 11026 ECB DIED EP RESISTORS HARKIO ART 3ULCCTED PER POWER See Garson Ve tot Paint e Loop npe enter aa ANALYTICAL I
9. ably be indicated by the inability to properly calibrate the analyzer when using span gas user will find thativery little adjustment of thellO 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 te calibrate the instrument or calibration cannot be achieved within the range of the control the cell should be immediately replaced To offset th possibility of not having a replacement cell available when it is needed TAI recommends that a spare cell be purehased shortly after the instmment is placed in service and each time the cell is replaced thereafter The spare cell should be carefully stored in area that is not subject to large variations ambient temperature 75 F nominal and in such a way as to obviate any possi se HOU bility of incurring damage Under circumstances dis turb the integrity of the cell package until the cell is to be actually used If the cell package is punctured and air permitted to enter the cell will immediately start to re act to the presence of oxygen required to replace the cell in the instrument beyond serewdriver to remove the cover plate cell is beneath the black cover marked Cell located on the front of the analyzer remove a depleted cell remove the three screws in the cover plate Remove the
10. ades of range differential to 10 ppm full svale sensitivity The instrument should recover completely to 1 ppm resolution after an overnight purge with sample gas 4 ROUTINE OPERATION 4 1 Sample Flow avoid creating a significant positive pressure on the Micro fuel Cell which would detract from the of the analysis flowrate should always be kept within the range of the integral flowmeter The flowmeter which is located downstream from the cell presents a tolerable im pedance to sample flow when the flowrate is within its range of measurement Increasing the flow beyond the limits the flowmeter increases the impedance it represents andra result ing back pressure is developed Since the cell is a partial pressure sensitive device the accuracy of the measurement will suffer accordingly To meet advertised specifications the flowrate need be no greater than 1 0 scfh 4 2 Calibration No prescribed routine calibration period is recommended feels that the intervals between calibration 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 calibratipn of the instru ment prior to certification would certainly be in order If on the other hand the instrument is being used to monitor or guard process for predetermined limits of acceptability the customer s knowledge of his process and the evidence pro
11. amage due to tampering or mishandling will render the cell warranty null and void 6 TECHNICAL INFORMATION 6 1 Transduction and Temperature Compensation The TAT Model 315 Trace Oxygen Analyzer utilizes a unique electrochemical transducer whose features include 1 Specificity for oxygen 2 Maintenance free 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 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 the effects of which have been minimized through the implementation of a alibrated thermistor compensation circuit The instrument is cycled through the operating temperature range 32 to 125 F and the value of resistor R21 see schematic will produce the advertised aceuraey specification 2 of scale or 5 of reading whichever is greater The reader should understand that the 5 of reading specification is a derivative of the wide operating temperature range and that at a constant temperature the accuracy is t 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
12. ditions of use Avoid contact between the sensor electrolyte and strong acids Section IV Health Hazard Data Primary Route s of Entry Ingestion Eye Skin Contact Exposure Limits OSHA PEL 05 mg cu m Pb ACGIH TLV 2 mg cu m KOH Effects of Overexposure Ingestion The electrolyte could be harmful or fatal if swallowed Oral LD5 RAT 2433 mg kg Eye electrolyte is corrosive and eye contact could result in permanent loss of vision Dermal electrolyte 15 corrosive and skin contact could result in chemical burn Inhalation Liquid inhalation is unlikely Signs Symptoms of Exposure Contact with skin or eyes will cause burning sensation and or soapy feeling for skin contact Medical Conditions Aggravated by Exposure None Carcinogenicity NTP Annual Report on Carcinogens Not listed LARC Monographs Not listed OSHA Not listed Other Health Hazards Lead is listed as a chemical known to the State of California to cause birth defects or other reproductiv harm Section V Emergency and First Aid Procedures Eye Contact Flush eyes with water for at least 15 minutes and get immediate medical attention CELLS MSD Skin Contact Wash affected area with plenty of water and remove contaminated clothing If burning persists seek medical attention Ingestion Give plenty of cold water Do not induce vomiting Get medical attention Inhalation Liquid inhala
13. e calibrated with air obviating the use of questionable certified trace oxygen calibration gases 1 2 Standard Features following outstanding features are incorporated in the Series 315 Trace Oxygen Analyzer line 1 2 1 Micro fuel Cell The Series 315 sets standard 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 oxygen and is not influenced by sample flow rate or the presence of reducing agents such as hydro carbons CO 80 etc nominal flowrate of 1 0 scfh approxi mately 600 cc m n is maintained through the instrument in the interest of an acceptable response time 90 in less than 10 seconds for ranges 0 100 ppm or greater consistent with low consumption of sample gas 1 2 2 Temperature Compensation The Model 315 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 32 to 125 F Employing 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 accompany
14. flon sealing tape be used as a sealant rather than pipe dope SURE THAT MATING FITTINGS ARE NOT CROSS THREADED BEFORE APPLYING FORCE WITH A WRENCH 2 3 1 Sample Line Installation The Model 315 is equipped with a throttle valve and flowmeter for sample path flow control The integral flow path also features a shutoff valve that is located downstream from the Micro fuel Cell manifold When closed these two valves isolate the cell from the high oxygen concentration of air TAI advan tage of this feature by shipping the instrument with the cell in place Prior to shipment the sample system is purged with either the customer s background gas when practical or an inert gas such as Nitrogen When the instrument indicates a stable low ppm oxygen level the two valves are closed and the cell is maintained in a virtually oxygen free atmos phere until the instrument is installed and ready for use IF RELATIVELY SHORT STARTUP TIME AND CELL CONSERVATION ARE IMPORTANT THESE TWO VALVES SHOULD NOT BE TAMPERED WITH UNTIL THE INSTALLATION PROCEDURE IS COMPLETED AND SAMPLE FLOW BE INITIATED The following sub sections outline the required accessories and considerations that are important to proper sampling system construction 2 3 1 1 Input Selector Manifold It will be necessary for the custemer to construct a simple two valve selector manifold to facilitate the introduction of either sample
15. is instrument air a metallic diaphragm type regulator is not required as diffusion will not alter its oxygen concentration When compressor supplied a throttle valve should be adequate i 2 3 2 Vent Line Installation Wherever possible TAI recommends that the analyzer be allewed to vent directly to the atmosphere If a vent line is required the following conditiens appiy to its installation 1 The vent line must be constructed of 1 8 inch tubing or equivalent and be as short as possible so that no back pressure from restricted flow is experienced by the Micro fuel Cell 2 The vent line must terminate in an area that experiences no more than normal barometric pressure changes 3 The vent line must be installed so that water and dirt cannot accumulate in it 2 3 3 Zero or near zero Pressure Sampling The Model 315 be configured by TAI to operate in applications where the sample pressure is either zero or near zero SUCH AN APPLICATION SHOULD BE SPECIFIED AT THE TIME OF PURCHASE To eliminate any possibility of diffusion contamination TAI recommends that the necessary sample pump be placed downstream from the analyser in vacuum service so that the sample is drawn through the analyzer from the sample point re arranges the integral sampling path at no extra cost so hat the throttle valve is located downstream from the celli This procedure prevents the cell from experiencing partial pres
16. n control 1 2 6 Speed of Response With a sample flowrate of 0 25 scfh the Model 315 achieves 90 response in 10 seconds to step changes in oxygen concentration in ranges of 0 100 ppm or greater the range 0 10 ppm the response time 15 60 seconds general the response of the Micro fuel Cell is significantly superior to that of most electro chemical trace oxygen measuring systems currently on the market 1 2 7 Compact Packaging Model 315 offers all the foregoing features as well as an integral throttle valve flowmeter and shutoff valve in a package that utilizes little more than 4 x 11 inches of panel space For most applications pressure reducing devices for the sample and calibration air either metering valves or regulators and a simple two valve selector manifold are all the accessory equipment that is the left side panel when viewed from the rear Sample in and sample out connections are made via the Swagelok connec tions located on the lower rear Of the analyser see required to operate the analyzer Access to the terminal strip for connecting power in and analog signal out is made by removing the small cover plate the upper rear of the analyzer Additional working c n be obtained when fitting conduit etc to the but cord by removing connection P Ax INSTALLATION I 2 1 Location The analyzer aust be installed in an area that is shelte
17. of the sample If air was not permitted to diffuse into the analyzer prior to the start of sample flow the analyzer will be ready for calibration in a matter of moments If however the analyzer performs as described in the final paragraph of Section 3 3 the analyzer should be permitted to run on the sample gas until stable low reading is achieved 3 5 Calibration Employ the following procedure when calibrating the analyzer 1 Arrange the input manifold so that span gas is flowing through the analyzer 2 Readjust the throttle valve if necessary so that the flowrate is 4 0 scfh 3 Place the range switch on the CAL position if the span gas is air or on the position that will give the best possible resolution of the oxygen content of the span gas 4 Unlock and adjust the span control knob until the meter pointer is in coincidence with the CAL mark on the scale air calibration or in agreement with the oxygen content of the span gas Be sure that the reading is stable and then relock the control knob 5 Rearrange the input manifold so that sample gas is again flowing through the analyzer Calibration particularly when the span gas is air should accomplished as rapidly as possible and the analyzer returned to the sample gas as soon as it is calibrated The longer the instrument is exposed to the 209 000 ppm oxygen concentration of air the longer it will require to return through the more than 4 dec
18. quilibrium at point that represents the actual concentration of oxygen in the sampling system between the throttle valve and shutoff valve The actual reading is a function of the setting of the span potentiometer and the diffusion penetration of air into the cell manifold It is impossible to achieve a perfect seal of the sampling system What the meter is indicating is the diffusion consumption balance point of the integral sampling system and the Micro fuel Cell If the meter reads more than one small division the probability is that one or both of the valves have been tampered with If this is the case no damage has occurred but a longer length of time will be required to purge the instrument before it is ready for use 3 4 Sample Startup After power has been established arrange the input selector valves so that the sample gas is being presented to the analyzer and start sample flow as follows 1 Open the cell shutoff valve first 2 Open the throttle valve and adjust it until the flowmeter indicates a flowrate of 1 0 scfh Final adjustments on the sample pressure reducing system should be made at this time so that the analyzer input pressure is nominally 10 psig The analyzer should start to respond to the oxygen concentra tion in the sample gas immediately Follow the advance or decline of the reading with the range selector switch until you reach the range that will give you the highest possible resolution
19. red from the elements The instrument case is not to be considered water tight by the customer In areas where the ambient temperature 15 expected to REGE BELO 32 F heating must be provided An outline diagram showing the location and identification of the gas line and electrical conduit connections as well as the physical dimensions of the analyzer is included among the drawings at the rear of the manual After the panel ontou has been made suggests that the mounting holes be line drilled using the analyzer case itself 7 as a template Wherever possible the analyzer should mounted at near eye Tevel so that its output meter can easily read 2 2 Electrical Connections All customer cl ctriosl wiring is to be connected to the terminal strip located behind the access cover at the rear of the analyzer Refer to the interconnection diagram in the drawing section back of the manual and be sure that the wiring installation com plies with the directions Contained on So ana in the sub sections epe 2 2 1 Pewee A source of single phase 198 to 24277 volt 50 or 60 cycle power capable of delivering a 1 4 ampere of current continuously erd to operate the Model 315 analyzer EG Power connections be polarized as indicated on the interconnection diagram HOT high side to
20. ro Sample Startup Calibration ROUTINE OPERATION 4 1 Sample Flow 4 2 Calibration 4 3 Shutdown and MAINTENANCE 1 2 3 Electrical Startup 4 5 Zero or near Startup 5 1 Routine Maintenance 5 2 5 3 Cell Warranty Cell Replacement zero Regulation 2 Vent Line Installation 3 oe Pressure Sampling of Sample Pat h Flow INO ERE Ui Ui iS o BW WWW 0000 11 14 AY TABLE OF CONTENTS Cont 6 TECHNICAL INFORMATION 12 6 1 Transduction and Temperature Compensation 12 6 2 Output Circuit 202024 2 DRAWING LIST RECOMMENDED SPARE PARTS LIST 1 INTRODUCTION 1 1 Method of Analysis Teledyne Analytical Instruments TAI Series 315 Solid State Trace Oxygen Analyzer utilizes a unique patented Micro fuel Cell to electrochemically measure the concentration of oxygen in a gas stream The cell has an absolute zero and produces 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 operational amplifier and an inte grated circuit IC the cell provides linear trace oxygen analysis in the ranges of 0 10 and 0 100 other ranges are optionally available No zero gas is required and the in strument may b
21. sure environment includes piping schematic of the analyzer which also depicts recommended sampling system see drawing section at the rear of the manual 3 STARTUP 3 1 Preliminary Before supplying power to the instru ment TAI suggests that the electrical wiring installation be checked against the interconnection diagram particularly if the installation has been made by a panel fabricator or personnel other than those responsible for startup aud opera tion All accessory hardware and fittings upstream from the analyzer should be leak tested under pressure prior to startup In many instances proper attention to these two preliminary steps will prevent severe damage accidental wiring transposi tion and ambiguous analysis of the sample diffusion leaks in the sampling system 3 2 Meter Zero Before turning the power to the analyzer on the mechanical zero of the meter should be checked and adjusted if necessary The meter indicating pointer should be in coincidence with the zero mark of the scale Use the mirror to eliminate parallex and adjust the screw on the face of the meter until the pointer indicates exactly zero IMPORTANT Never attempt to make this adjustment with the power on 3 3 Electrical Startup Select the CAL range and move the power switch to ON Wait a minimum of ten 10 seconds to allow the power supplies to reach full voltage capacity The meter moves upscale and comes to e
22. the components associated with an electrical heating system 1 2 3 Meter Readout Model 315 is equipped with panel meter for direct readout of the analysis A linear 50 division scale mirror equipped to eliminate parallex pro motes reliable accurate readout of the analysis at any point on the scale resolution and accuracy of the instrument s meter 2 of full scale obviates the necessity of an acces sory readout device unless greater accuracy or permanent recording of the analysis is required 1 2 4 Output Signal For those applications requiring continuous recording of the oxygen content of the sample 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 of 10 000 ohms or more 1 2 5 Dual Range Analysis Model 315 accurately measures oxygen in the ranges 0 10 ppm and 0 100 ppm Range selection is accomplished by the positioning of the toggle switch Located below the readout meter In addition 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 using instrument air and the CAL mark on the meter dial to sep the spa
23. tion is unlikely Section VI Handling Information Handling Precautions Note The oxygen sensors are sealed and under normal circumstances the contents of the sensors do not present a health hazard The following information is given as a guide in the event that a cell leaks Protective Clothing Rubber gloves chemical splash goggles Clean up Procedures Wipe down the area several times with a wet paper towel Use a fresh towel each time Protective Measures during Cell Replacement Before opening the bag containing the cell check the cell for leakage the cell leaks do not open the bag If there is liquid around the cell while in the instrument put on gloves and eye protection before removing the cell Disposal Should be in accordance with all applicable state local and federal regulations 1 TABLE OF CONTENTS INTRODUCTION 1 1 Method of Analysis 1 2 Standard Features 1 2 1 1 2 1 2 1 2 1 2 1 2 1 2 INSTALLATION 2 1 Location 2 2 2 2 2 2 2 Power Signal 2 3 1 2 3 1 1 2 3 1 2 2 Gas Connections Sample Line Installation Input Selector Manifold Recommended Span Gas 2 3 Meter Readout 4 Output Signal 5 6 7 Electrical Connections Micro fuel Cell Dual Range Analysis Speed of Response Compact Packaging Temperature Compensation 3 1 3 Pressure Reduction and or 3 23 TARTUP 4 ss xo Preliminary Meter Ze
24. vided by the instrument will in themselves determine when a calibration check is in order 4 3 Shutdown and Startup of Sample Path Flow Whenever it becomes necessary to cut off the sample flow to the instru ment the following prescribed procedure should be used to minimize the diffusion of air into the instrument and there by maintain the cell in a low ppm oxygen environment 1 Reduce the flowrate so that the flowmeter float is just barely indicating 2 Close the cell shutoff valve and in the case of humidifier equipped instruments the tank assembly valve completely 3 Close the throttle valve completely If the valves are completely closed the output indication will eventually come to equilibrium off scale in the 0 100 ppm range and less than one minor division on the CAL range When gas flow is to be restarted open the cell shutoff valve first and then immediately open and adjust the throttle valve 5 MATNTENANCE 5 1 Routine Maintenance The Micro fuel Cell is a sealed modular component that need onky be replaced when at fault normally at six month intervals or long r 5 2 Cell Replacement characteristics of the Micro fuel Cell are similar to those of a mercury 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 process being analyzed has low oxygen concentration cell failur will prob
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