LPDT User`s Manual - ABLE Instruments & Controls
Contents
1. 34 Appendix D LPDT Electrical Connections 35 Appendix E Sensor SpanCheck Theory of Operation 36 Appendix F Pressure Correction 39 Appendix G Current vs Dewpoint 40 LPDT User s Manual Appendix H Uncertainty in LBS amp ppmV calculations 43 Appendix I Sensor Response Time 44 Appendix J Return Authorization Request 45 vi Section 1 Introduction 1 0 Overview of the LPDT The LPDT is a microprocessor based 4 20mA loop powered 2 wire hvgrometer for measuring moisture content in gases in the range from 100 C to 20 C The measurement is displayed on the instrument s custom LCD and is trans mitted by varying the current drawn 4 20mA from the power supply The current varies linearly proportional to the selected measurement units An optional digital output is available which modulates demodulates the 4 20mA loop line without interfering with its operation With this option the LPDT is capable of communicating with properly equipped Personal Computers or other RS 232 capable con trollers Three front panel buttons provide the user with a wide variety of features The LPDT s advanced design allows it to be housed in a small stainless steel enclosure behind the sensor probe thus the instrument and sensor are a single integrated unit The LPDT uses th2. 3 2 2 Sensor Technical Specifications 4 2 3 Sensor Installation amp Sampling Techniques 4 2 3 LAS Installation 5 2 3 2 Extractive Installation 7 2 4 Troubleshooting unexpected readings 9 3 1 Precautions using the LPDT 13 3 1 1 Electromagnetic Compatibility Considerations 13 3 2 Instrument Technical Specifications 14 3 3 Installation za k bean IHE 15 3 3 1 Mechanical Installation 15 3 3 2 Electrical Installation s odo eta 16 3 4 Operating the Instrument 17 A i s 17 3 4 2 Display Conventions 17 3 4 3 Push Buttons siii a 19 A stud nien eoe al Ue aet 19 3 4 4 1 Viewing Dewpoint Mode 20 3 4 4 2 Viewing Temperature at the Sensor 20 3 4 4 3 Start Calibration SpanCheck Mode 21 3 4 4 4 Viewing Serial Number Mode 24 3 4 5 SetUp State NS 24 3 5 Troubleshooting the Instrument 28 Appendix A Operating State User Interface flowchart 31 Appendix B Set Up State User Interface flowchart 32 Appendix C LPDT Mechanical Drawing
3. 0 7 0 6 0 5 o wo o wo o wo o wo o wo o Measured Dewpoint C page 43 LPDT User s Manual ime Sensor Response T Appendix I ou 00 S6 06 S8 08 GZ OL S9 09 GG Sr SE 08 Sc O2 SL OL G 0 obueyo deis JO G6 4 oDueuo dais JO 9 69 winugiinba jo suygy 194e dp o zz9 0 o aun 1e dp O yree Woy NMOQ eBueuo deis e o siosuas Oo6 v JNEJUSX jo au asuodsay 401 001 96 06 98 08 SL 02 99 09 SS 09 Sv 07 Se 0 Sc 0c SL 01 96 of step change page 44 Appendices Return Authorization Request Xentaur must approve and assign a return authorization number RAN to anv instrument being returned The RAN must appear on all paperwork and packag ing The issuance of a RAN does not automatically implv that the instrument is covered by our warranty In order to serve you better and protect our employees from any potentially haz ardous contaminants Xentaur must return unopened at the senders expense all items that do not have a RAN To obtain a RAN fill out a copy of this form and fax to 516 345 5349 Customer Information Company Name Address Contact Name Phone Fax Equipment Information Part or model number LPDT Serial number Original Purchase date P O number Reason for return failure and hookup description if applicable Process material s and or environments including radiation to which the equ
4. Also consider the need to isolate depres surize before installing or removing the sensor 4 20mA le MT OmA loop cable 2 LPDT pudu In Line Installation Sensor v i Measuring at Line Pressure NOT RECOMMENDED Main Gas Line a 4 20mA loop cable gt LPDT bint Transmitter Bypass Installation Sensor Measuring at Line Pressure Control Valve maintain differential pressure to provide adequate flow through sample cell page 6 Section 2 Sensor and Sampling Techniques 2 3 2 Extractive Installation For extractive installations we recommend our sample svs tem ESS which may be equipped with a variety of features such as isolation valve coalescing or particulate filter pressure regulator calibration sample injection or extraction port pressure gauge flow meter weatherproof enclosure Refer to the ESS literature for more information If the resources to make your own sample system are avail able the following two diagrams may be used as a guideline to configure a simple system 4 20mA loop cable I p 2 bint Transmitter Regulator or Needle Valve Extractive Installation Sensor Measuring at Line Pressure Regulator or Needle Valve Extractive Installation Sensor Gas Line Measuring at Ambient Pressure page 7 LPDT User s Manual It is generally recommended to measure at ambient pressure for the following reasons The readings will not be affected by va
5. dling If any damage is evident notify the carrier and request an inspection Unpack the box 1t should contain The LPDT with sensor in desiccant container connectorized cable and this manual PLEASE READ THIS MANUAL IN WHOLE PRIOR TO INSTALLING OR REMOVING THE SENSOR FROM ITS SHIPPING CONTAINER This manual is organized in three sections Section 1 is an overview of the LPDT Section 2 describes the sensor and sampling tech niques Section 3 describes the instrument s electrical mechanical and user interfaces This manual is intended for those already familiar with the installation use and maintenance of ana Ivtical or process instrumentation Those acquainted with other Xentaur dewpoint measurement products such as the XDT or the XPDM will benefit from the commonality of the user interface LPDT User s Manual Warranty Xentaur instruments are warranted to be free from defects in workmanship and materials Liabilitv under this warranty is lim ited to servicing calibrating and replacing any defective parts of the instrument returned to the factory for that purpose Fuses are specifically excluded from any liability This warranty is effective from the date of delivery to the original purchaser The equipment must be determined by Xentaur to have been defective for the warranty to be valid This warranty applies as follows one year for electronics one year for mechanical failures to the sensor six m
6. or replace unsuitable pipe with copper or stainless steel Flexible con Wet Reading nections should be made with PTFE pipe NEVER use rubber or plastic pipe This type of indicator reads about 10 C dry at about 50 C dewpoint due to tempera ture gradients within the device The error increases at drier levels Display Shows co ME Dry the sensor install sensor in either a known dry gas stream i e instrument quality air or dry nitrogen or place sensor in a dry can or bottle of desiccant and seal the con tainer from outside air the shipping container is designed for this purpose Display Shows SH Remove unscrew sensor if the instrument still reads SHr the problem is with the instrument However if the instrument reads o gt then check possible cause 2 Remove unscrew sensor and note that the meter reading returns to oPn Use a new sensor or apply approximately 20V DC between the center pin amp the filter body of the sensor MOMENTARILY with the sensor in a known dry condition Polarity is not important but the contact MUST be very brief or the sensor may be damaged Display Shows e P n Remove unscrew the sensor Short the center contact of the LPDT sensor connection to the case if the instrument reads SHr the problem is in the sensor otherwise return the instrument for service Check sensor connection or replace sensor page 11 LPDT User s Manual page 12 Sectio
7. when the MODE button is pressed and retained even if the unit is turned off 1 Display of alternate units In this mode a second engi neering unit can be chosen to be displayed alternating with the engineering unit selected in the operating state for example a dewpoint can be displayed alternating with the sample temperature or dewpoint can be alter nately shown in C and in PPM 2 Selecting the sensor type In this mode the user can select the software matching the type of sensor installed in the instrument t i XTR 100 100 C to 20 C 266 XTR 65 65 C to 20 C 3 amp 4A djusting low end sensor attenuation and dewpoint These modes are used to enter a data pair representing a low dewpoint and the sensor attenuation measured at this low dewpoint see Sensor Theory of Operation appendix E This data pair should not be modified unless the sensor is replaced The sensor shipping con page 25 LPDT User s Manual tainer is labeled with the proper values 5 Calibration Adjustment In this mode the user can enter a sensor specific Adjustment Value to improve the instruments accuracy in the range of 50 C to 10 C this adjustment has very little or no effect outside this range The Calibration Adjustment Value is printed on the shipping container supplied with the sensor or may be derived if the sensor can be exposed to a known ref erence Deriving an Adjustment Value If the adjustment value for your sen
8. 1999 by Xentaur Corporation LPDT User s Manual Xentaur reserves the right to change or modify the product specification and or appearance at any time without notice Therefore the information in this document is subject to change without notice and does not represent a commitment on the part of Xentaur Corporation The customer agrees that in accepting and using this instru ment Xentuar Corporation s liability arising from or in any way connected with this instrument shall be limited exclu sively to performing a new calibration or replacement or repair of the instrument or sensor at Xentaur s sole option as covered by Xentaur s warranty In no event shall Xentaur be liable for any incidental consequential or special dam ages of any kind or nature whatsoever including but not limited to lost profits arising from or in any way connected with this instrument or items hereunder whether alleged to arise from breach of contract express or implied warranty or in tort including without limitation negligence failure to warn or strict liability Swagelok Cajon are trademarks of SWAGELOK Co Acrobat is a trademark of Adobe Systems Incorporated Microsoft Windows is a registered trademark of Microsoft Corporation HTF is a trademark of Xentaur Corporation SpanCheck is a trademark of Xentaur Corporation The Xentaur Logo is a trademark of Xentaur Corporation LPDT User s Manual Examine the LPDT package for damage or mishan
9. Alu minum Oxide such as changes due to temperature are insignificant in relation to the capacitance due to the water content Thus the sensor capacitance varies greatly in pro portion to the water content in the surrounding gas The sen sor is designed such that the relationship of the quantity of water and the resultant capacitance has an S shaped curve At the extremely dry end the curve is asymptotic to the capacitance due to the Aluminum Oxide and the gas while at the very wet end the curve is asymptotic to the capaci tance due to water molecules packed extremely tightly sat urated in the pores of the Aluminum Oxide This upper end is an excellent indication of the total pore volume while the lower end of the curve is an indication of the distance between and area of the capacitor plates electrodes this is the intrinsic capacitance of the sensor Therefore knowing these two points a sensor can be calibrated with compensa page 36 Appendices tion for small manufacturing deviations As the sensor is used in real world applications it is exposed to various elements and stress like anv other sen sor it may over time drift from calibration However one must note that the intrinsic capacitance will not change with use because it is based simplv on the dielectric constant of Al203 and the distance between amp area of the plates elec trodes thus the original factorv measured values will alwavs be valid What mav chang
10. Calibration Mode page 20 Section 3 Instrument 3 4 4 3 Start Calibration SpanCheck TM Mode The instrument is calibrated at the factorv with the sensor it is shipped with and does not need to be re calibrated prior to installation Instrument calibration is recommended in approximatelv 12 month intervals and the XTR65W sensor should be re cali brated after prolonged exposure to liquid water Simply fol low steps 1 7 of the procedure below removing the sensor from the sample gas stream Make sure the gas stream is depressurized before removing the sensor to avoid injury It is recommended to keep the sensor exposure to room air as short as possible to avoid super saturation of the sensor While super saturation is not damaging to the sensor 1t will prolong the initial dry down time after you install the sensor in the sample stream Therefore remove the sensor from the packaging container only after you are ready to proceed with the calibration procedure and install the sensor in the sample stream immediately after the calibration procedure is completed If you are not ready to use the sensor right away after calibration put the sensor back in the shipping container for dry storage The instrument must be calibrated with the sensor it will be used with The calibration procedure takes advantage of the designed saturation level DSL feature of the sensor and is executed by the instrument computer by performing the fol lowin
11. parameter settings protecting the instru ment from unauthorized or inadvertent changes of parameters Attempting to change settings while instru ment is locked will display Lot To unlock the instrument press the UP button to lock the instrument press the DOWN button Pressing the MODE button will navigate back to the Select Alternate Display Units mode Pressing and holding either the UP or DOWN button will save the lock or unlock setting depending on the button and reset the instrument This feature is useful 1f 1t is difficult to power off the instrument Note It is imperative that one returns the instrument to the locked mode to avoid unauthorized changes 3 5 Troubleshooting the Instrument This instrument performs diagnostic tests on power up as well as once every two minutes The table that follows depicts all possible error unexpected messages that may be displayed on the instrument For each message the table has explanations for the reason and if necessary a suggested action to remedy it page 28 Section 3 Instrument DISPLAY EXPLANATION REQUIRED ACTION LO Err PROM check sum failed 8 HI Err RAM write read test failed 8 cycle power o Err Unidentified power up failure B if problem persists a CSF EEPROM Check Sum Failed return to your representative Ecc Rd A D converter failure for service s Err rEF Reference voltage for A D ou
12. provided Viton A O ring If the 14mm x 1 25 spark plug thread is used then an addi tional Viton gasket must be installed to provide the proper seal Ask your representative for this gasket it is available free of charge The LPDT is light enough such that either thread will mechanically support the whole instrument To prevent any leaks tighten the LPDT into the sample cavity with a 17 wrench 1 8 turn past finger tight to assure metal to metal contact Since the tightened positioning of the LPDT is unpredict able its front panel may be rotated 360 to allow easy reading of the display Press down gently on the spring loaded face plate and turn it to the desired position The sensor can be removed from the LPDT by unscrewing it Make sure that the sensor is securely fastened to the page 15 LPDT User s Manual LPDT the tension washer should be compressed so that it does not come loose during use 3 3 2 Electrical Installation The LPDT will operate properly with 10VDC to 33VDC at its input if this voltage is exceeded the internal fuse may blow When selecting the power supply voltage do not neglect the drop across any current measurement resistor and wiring in the loop The connector is a standard 2 1mm x 5 5mm 12mm minimum barrel length DC power jack an internal diode bridge accommodates either polarity The LPDT may be powered using an off the shelf wall trans former with 2 1mm connector or from a power supply usi
13. to 100 ppmV and the analog output is set up with the factory defaults of 100 C to 20 C which is 0 014 to 23612 ppmV then the current loop out put will vary only from 4 1 to 4 2 mA in the area of inter est consult with the graph on the following page In most instances this would be an unacceptable output for proper monitoring of the measurement In this example the user should adjust the analog output low amp high ranges such that the output range is better suited to the measurement of 10 to 100 ppmV It may be useful to select the low and high ranges to be 5 and 150 ppmV respectively thus out of range conditions will be detected properly Then the low range will be set to 5ppmV which is 65 5 C dewpoint and the high range will be set to 150ppmV which is 38 5 C dew point Now the current loop output will be 4 55 to 14 48 mA in the range of 10 to 100 ppmV the 10mA variation is more than sufficient for a good measurement by the user s equipment One may carry out similar calculations for LBS or G M3 and choose the appropriate settings While making these computations it may be useful to obtain a copy of Xentaur s dewpoint calculator this is a Microsoft Win dows program which simplifies the process of converting dewpoint measurement units It is available at www xen taur com If you are not certain how to carry out such calcu lations send by e mail to xentaur xentaur com or by fax to 516 345 5349 your system specif
14. 86 indicating that the sensor has super saturated As soon as the sensor is exposed to an atmosphere with a dewpoint lower than the saturation dewpoint the dis play will indicate the dewpoint measured by the sensor The display may show alternating En and as an indication that the measured capacitance is too low to be from a saturated sensor in this case make sure that the sensor is fully engaged into the LPDT and repeat the page 22 Section 3 Instrument calibration procedure 7 Install the sensor in the sample cell or adapter fitting or put it back into the packaging container for later use The instrument will retain the calibration even if the power is turned off Under certain conditions an over super saturated sensor may need to be completely dried out before a calibration is performed Symptoms of these conditions are a sensor that will not go through the SpanCheck function to the End display or a sensor that will not dry down after calibration To dry install sensor in either a known dry gas stream i e instrument quality air or dry nitrogen or place sensor in a dry can or bottle of desiccant and seal the container from outside air the shipping container is designed for this pur pose After a minimum dry out period of 24 hours proceed with the calibration procedure of your choice SpanCheck calibrates sensors by using micro climates Please contact your representative if you have any questions abou
15. A sE Instruments 8 Controls Installation 8 Maintenance Instructions Loop Powered Dewpoint Transmitter cosa xentaur Reading Office Aberdeen Office FU Cutbush Park Danehill Lower Earley Unit 6 Airside Business Park Kirkhill Industrial Estate Internet www able co uk a ST Reading Berkshire RG6 4UT UK Dyce Aberdeen AB21 OGT UK e procurement www 247able com Tel 44 0 118 9311188 Tel 44 0 1224 725999 Registered in England No 01851002 CM Email info able co uk Email ab able co uk VAT No GB 417 2481 61 LPDT User s Manual When calling your representative for technical support please have your serial numbers available The Sensor and Instrument Serial Numbers are on the instrument also see section 3 4 4 4 Sensor Serial No Instrument Serial No Your Representative is Except as may be provided by contract this document and all specifications and drawings contained are the property of Xen taur Corporation are issued in strict confidence and shall not be reproduced or copied or transmitted in any form or by any means or used as the basis for the manufacture or sale of appa ratus programs or services without permission Check the Internet for updates the latest revision of this manual is available in Adobe Acrobat format at http www xentaur com Document No LDO 01 D 2000 Rev 0 6 1 99 Copyright
16. POINT GM DEWPOINT DEWPOINT 0 013 849 0 000 921 15 0 000 014 75 p lbs H O mmSCF grams H O meters 0 000 000 1 ppmV x10 x10 x103 i3 B 5 PPM a c mic m Vo U Did u DEWPOINT DEWPOINT LBS DEWPOINT G M page 18 Section 3 Instrument 3 4 3 Push Buttons Three push buttons are located on the front panel p xi MODE button UP button DOWN button Each button is marked with an icon engraved above it In general the MODE button navigates through the different user options Modes the UP and DOWN buttons modify the units values or choices in the selected mode Refer to the flow diagrams in Appendix A for detailed overview of button functionalitv A button mav be held down for a pro longed time for accelerated incrementing or decrementing of numeric values 3 4 4 Operating State Upon power up the unit performs certain initialization tests see table in section 3 5 and enters the Operating State in the Viewing Dewpoint mode Depressing the MODE but ton will change modes see appendix A in the following order O Viewing Dewpoint lt O Viewing Temperature lt O Start Calibration lt O Viewing Serial Number lt back to O Viewing Dewpoint The unit will return to Viewing Dew point mode if no buttons are pressed for 30 seconds unless 1t is performing a calibration page 19 LPDT User s Manual 3 4 4 1 Viewing Dewpoint Mode In this mode the user can view the dewpoint this is in
17. Unsuitable sample pipe material 5 Leaks 6 Hygroscopic materials in sample system Dry Reading SpanCheck wrongly set or faulty sensor Wet Reading Leak in system or use of unsuitable pipe Comparison of readings with manual cooled mirror instrument Display Shows co ME Prolonged exposure to wet gas Display Shows cu mu 1 Instrument Failure 2 Short circuited sensor Display Shows orn 1 Instrument failure 2 Open circuit on sensor For non sensor related problems e g no reading on instru ment refer to section 3 5 page 10 Section 2 Sensor and Sampling Techniques Troubleshooting unexpected readings continued from previous page Symptom Diagnostic Remedy Reading is not changing Condensation will occur if the temperature of the sample system at any point is below colder the dewpoint temperature of the sample gas Once having formed the sample reaching the sensor will have a dewpoint equal to the temperature of the condensation regardless of the dewpoint of the sample at the sample point Slow Response It is usually more satisfactory to bleed a sample gas at atmospheric pressure through the sensor sampling chamber and to use 1 8 3mm o d sample pipe See below re sample pipe material also see section 2 3 Dry Reading Verify SpanCheck or return sensor for full calibration to your representative Cure the leak
18. and the second part is the units For example serial number 12345 will be shown as Pressing the UP and DOWN buttons simultaneously resets the instrument this is useful for restarting in the set up state by holding the MODE button in installations where power can not be turned on and off easily x10 3 Pressing the MODE button changes the unit to the Vievving Devvpoint Mode 3 4 5 SetUp State To enter the Setup State povver up the unit or reset it from the serial number Mode and hold the MODE key pressed vvhile the unit is initializing Refer to Appendix B for a flovv page 24 Section 3 Instrument diagram of the SetUp State The setup state provides nine capabilities each one con trolled from its own mode Depressing the MODE button navigates through the modes in the following order O Se lect Alternate Display Units lt O Select Sensor Type lt O Set Measured Attenuation of Sensor at a Low Dewpoint lt OSet the Low Dewpoint at which the Attenuation was measured O Set the Calibration Mid range Adjust lt O Perform a Test and Verification of the Analog Output lt Set dewpoint cor responding to 4mA of Analog Output lt O Set dewpoint cor responding to 20mA of Analog Output lt OLock Unlock the instrument x back to O Select Alternate Display Units These nine functions are explained in their respective sec tions which follow Changes can be made only to an unlocked instrument the changes are stored
19. cal adjust value and observe the alternately displayed dew point Perform this adjustment until the dewpoint matches the value shown by the reference instrument h Press the MODE button to go to the next mode this will save the new cal adjust value and it will be retained even if power is turned off Entering a known Adjustment Value If the sensor is being replaced an adjustment value should be supplied with the sensor to enter it into the instrument a Go to the LAL Adu mode and press the UP button the display will show the current value in the range of 1 99 to 1 99 followed by blinking horizontal lines ignore the alternately displayed dewpoint b Use the UP or DOWN buttons to modify the cal adjust value as necessary c Press the MODE button to go to the next mode this will save the new cal adjust value and it will be retained even if power is turned off 2 3 4 and 5 are set at the factorv and need onlv be modified when a sensor is changed 6 Testing the analog output By pushing the UP or DOWN buttons the user forces the analog output to its low and high values respectively This facilitates the hook up and testing of the user s monitoring equipment 7880 utput range setting These modes are used to set dewpoints corresponding to the low and or high end of page 27 LPDT User s Manual the current loop output refer to appendix G 9 Lock Unlock the instrument This mode is used to block access to
20. cept for the XTR65W sensor 1 Do not expose the sensor to liquid water as it may get damaged 2 Do not breathe directly onto the sensor as condensa tion may form which could damage the sensor element Do not install the sensor near heat sources such as radia tors or air ducts Do not install the sensor in places subject to extreme mechanical vibration or shock If this is not avoidable use resilient mounting If in doubt call your representa page 3 LPDT User s Manual tive Do not disassemble the porous metal filter encapsula tion as this will damage the sensor and void your fac tory warranty Prior to installation of the probe ensure that no contam inants are present in the system e g oil liquid water 2 2 Sensor Technical Specifications Type Hyper Thin Film high capacitance Al 03 Dewpoint range XTR 100 1489F to 68 F 100 C to 20 C XTR 65 85 F to 68 F 65 C to 20 C Capacitance 15nF to 200nF Accuracy 35 5 F 43 C Repeatability 0 9 F 40 57 O Response time see graph in Appendix I Temperature range 10 C to 70 C Sample Flow range linear velocity 9 1 ATM Static to 100m s Storage temperature 40 F to 176 F 40 C to 80 C Mechanical encapsulated in 100 sintered stainless steel Ca
21. cross the inductors to keep down the high voltage spikes during transitions page 13 LPDT User s Manual Any circuitry which is activated by relay contacts should account for the contact bounce one simple debouncing method is placing a capacitor across the relay contacts AC power wiring should be routed as far away from the LPDT and its wiring as practical 3 2 Instrument Technical Specifications Enclosure Dimensions z Weight Pressure operating range Mechanical connections Electrical connections Cable AZA is Power Requirements Input resolution Indicators C F PPM LBS H 0 mm scf gm Engineering units Controls Outputs seite Stainless Steel optional weather proof cover is avail able 2 Dia x 4 75 long including sensor amp connector see appendix C 0 Slbs Standard 500 PSI 34 bar Optional 5 000 PSI 340 bar 14mm x 1 25mm threads and 34 16 threads 2 1mm x 5 5mm 12mm minimum barrel length power jack with retainer Two conductor cable 12 4m provided 10 to 33 VDC polarity independent the instrument draws 4 20mA depending on measured dewpoint 0 1 C dewpoint 3 5 digit LCD with custom legends 3 push buttons user s selections are stored in EEPROM Analog and digital outputs are available from th
22. di cated by the presence of the DEWPOINT legend on the lower left of the display The available engineering units in which to view the moisture content are C F PPM LBS and G M5 the UP and DOWN buttons scroll back and forth through these units in respective order The C and F are dewpoint readings The PPM is parts per million by volume computed at the sensor pressure more about pressure in appendix F The LBS and G M are pounds of water per million standard cubic feet and grams of water per standard cubic meters both in Natural Gas they are computed according to data derived by IGT Research Bulletin 8 tak ing into account sensor pressure Note that the analog output is linear to the selected engi neering units therefore be mindful that while scrolling through various units the analog output may change even though the measured dewpoint is stable The PSI legend flashes at the bottom of the display when there is pressure correction in the computation of the dis played values refer to appendix E 3 4 4 2 Viewing Temperature at the Sensor In this mode the user can view the thermodynamic tempera ture at the dewpoint sensor inside the sampling chamber this is indicated by the flashing TEMP legend on the lower left of the display The available units in which to view the temperature are C and F The UP and DOWN buttons switch back and forth between these units Pressing the MODE button changes to the Start
23. e LPDT A 4 20mA drawn by the instrument from the power supply The 4 20mA is linear to the selected engi neering units the range is programmable Output resolution is 0 1 C dewpoint B The instrument can supply digital output by modulating the 4 20mA loop line The timing and format of the data conforms to RS 232 however to interface to a PC or other RS 232 device an optional adapter is required In the digital mode the LPDT can be remotely operated and the dewpoint as well as temperature page 14 Section 3 Instrument and pressure if installed can be read In the digital mode multiple units can operate on the same loop cable as a multi channel instrument Alarms The 4 20mA signal or the digital output may be used by an external device to operate relays Isolation Sensor and case are isolated from the current loop but are shunted with a 33V transorb and 2000pF capacitor 3 3 Installation 3 3 1 Mechanical Installation The LPDT has two thread sizes for mounting to the sample cavity consult the sensor installation section where the dewpoint will be measured Various adapters are available for direct connection into existing system openings Ask your representative for a Sample Cell if you do not have the ability to provide an appropriate sample cavity mounting If the x16 thread is used then the LPDT will seal against the wall of the sample cell with the
24. e 8 Section 2 Sensor and Sampling Techniques Donot install any devices upstream of the sensor such as other measuring systems flow meters etc which are not absolutely necessary as these are potential leak sources Installation of a coalescing and or particulate filter ahead of the sensor is desirable to prevent any liquid or particulate contamination of the sensor If filters are used upstream of the sensor make sure these contain non hygroscopic filter materials only If pressure regulators shut off valves etc are used upstream of the sensor make sure these do not contain rubber or other hvgroscopic materials 2 4 Troubleshooting unexpected readings If erroneous readings are suspected on a newly acquired instrument compare the serial number engraved on the sen sor sintered filter to the one stored in the instrument mem ory The two should be the same if they are not the instrument may not be calibrated with the installed sensor To troubleshoot other problems identify the unexpected reading category in the following table and consider the possible causes and appropriate diagnostic action and rem edy page 9 LPDT User s Manual Troubleshooting unexpected readings table spans 2 pages Symptom Possible Cause Reading is not changing Condensation in sample system Slow Response 1 Water vapor in the system 2 Flow rate too low 3 Sample pipe too large and or too long 4
25. e Xentaur HTF sensor which is encap sulated in sintered stainless steel thus it is capable of com ing into contact with a wide variety of environments However one should keep in mind that the sensor is a sensi tive device and it should be handled accordingly page 1 LPDT User s Manual page 2 Section 2 Sensor and Sampling Techniques 2 1 Precautions using the sensor The Xentaur HTF Al O sensor is designed and field proven to be highly reliable rugged and maintenance free However the user should consider the following precau tions To avoid the need for prolonged dry down when expecting to measure dewpoints dryer than 65 C do not expose the sensor to room air longer than necessary 1 2 minutes Thus do not open the sensor container before you are ready to install the sensor The sensor container has desiccant to keep the sensor dry during shipping and to avoid damage due to conden sation Close the container immediately after removing the sensor to avoid degradation of the desiccant Do not throw away the sensor container you may use it again to transport the sensor between locations to store it between uses or to ship it back to the factory for certi fication The container can be attached to the loop cable by trapping the cable with the lid strap Do not expose the sensor to corrosive gases such as gases containing chlorine ammonia or HCI SO2 can be monitored when the moisture content is low Ex
26. e is the pore volume due to clogging with contaminants residual oxidation metal migration etc Thus to re calibrate the sensor the instrument needs only to know the capacitance at the wet end of the curve As discussed previously the capacitance at the wet end approaches asymptotically a saturated pore capacitance therefore if the sensor is saturated the exact water content will not be important since the curve is asymptotic then the instrument can measure the capacitance and re calibrate the sensor This is refered to as SpanCheck The advantages of this unique capability of Xentaur sensors and instruments are obvious in time and cost savings for re calibration as well as ease of sensor replacement Xentaur HTF Sensor Dewpoint vs Capacitance Response Curve 200 Is Saturated Capacitance Asymtote of New Sensor E Saturated Capacitance Asvmtote of Aged Sensor 160 Ne 1 T She R ow A Sensor G n m Es lt t ry 120 lt o 3 isi 80 o 40 E Dry Capacitance Asymtote of New amp Aged Sensor 0 80 60 40 20 0 20 Dewpoint Reference C page 37 LPDT User s Manual page 38 Appendices Appendix F Pressure Correction Sensor Pressure is used in the context that this is the pres sure inside the sampling chamber when performing the measurement i e it is the operating pressure of the sensor Gas Pressure is u
27. ewpoint viewed on Instrument Display and available as Voltage output tl bint Transmitter C M om 12 33VDC 0 4 2V output Operation with Multichannel Option Board Dewpoint viewed on each Instrument Display and available on remote interface RS 232C A to Computer Multichannel Option Board DC or AC supply multiple units connected on the same two wires page 35 LPDT User s Manual Appendix E Sensor SpanCheck Theory of Operation The Sensor is constructed as a capacitor whose dielectric consists of porous Aluminum Oxide as well as the gas that has entered in the pores of the Aluminum Oxide The plates electrodes of this capacitor are an aluminum substrate and a porous gold layer deposited on top of the Aluminum Oxide the porous gold electrode allows transfer of gases into or out of the Aluminum Oxide pores The capacitance due to the Aluminum Oxide is always con stant while the capacitance due to the gas varies according to the gas content and pressure Since the dielectric constant of water is orders of magnitude larger than that of any gases being measured the quantity of water vapor present in the pores changes the capacitance of the sensor to a much greater extent than any other system variable For the same reason the extremely large dielectric constant of the water molecule any capacitance variations arising from the
28. g steps 1 If the instrument is locked and a calibration is attempted it will display Lol and will not perform the calibration To unlock the instrument consult section 3 4 5 9 page 21 LPDT User s Manual 2 Push the MODE key a few times until the display shows LAL 3 Press the UP button The display will show EnF prompt ing you to confirm that you want to start the calibration procedure You can abort the calibration procedure by pressing the MODE key 4 Remove the sensor from its packaging container so that the porous metal filter is visible and the sensor is exposed to in hand micro climate Close the packaging container as soon as you have removed the sensor to avoid degradation of the desiccant inside of the con tainer You may want to re use the container at a later date 5 Push the UP button again to confirm that you want to start the calibration procedure The display will flash AL for 60 seconds while the sensor is saturating Make sure you keep the sensor exposed to in hand micro climate until the display shows End 6 After 60 seconds the display will flash the selected sen sor type see Selecting a sensor type 3 4 5 2 and then the instrument will calculate the slope and offset of the sensor curve while displaying the calculations and then will display End for a few seconds after which the instrument will automatically go into measuring mode The sensor calibration is completed The display may flash 5
29. ics and some one will get back to you with appropriate analog output settings In general if the dewpoint is monitored in C or F there is no need to change the factory default 100 C to 20 C set tings because the 4 20mA provides sufficient resolution to measure the output better than the specified accuracy of the sensor page 41 LPDT User s Manual Relationship of 4 20mA output and instrument reading in ppm V or LBS o o e e e e S 289 1 LBS 0 C 6063 8 ppm 2 o e 8 49 3 LBS 20 C 1019 3 ppmV Instrument reading in ppmV 100 1 97 LBS 50 C 38 83 ppmV 10 Instrument reading in LBS of H20 million cubic feet 10 o a lt lt lt lt lt ae 6 amp E E E E N 45 16 4 20 mA output page 42 Appendices Appendix H Uncertainty in LBS ppmV calculations 48 1000 44 900 38 800 34 700 29 600 24 500 19 400 15 300 g B o 10 200 Pa E j o 5 100 90 ES 70 O o m E 60 Y y Eas 50 gt 5 s o a Di 30 E b s t o 01 20 2 S 9 D G G O o o 8 gt O 0 5 m o 9 m 8 o 7 6 a Q 0 25 j 5 5 A gt E a R o E EA ki l 5 0 1 KA 3 o 0 05 1 0 9 0 8
30. iculate filter with suitable capability do not use hygroscopic filter materials 2 3 1 In situ Installation In situ installation is recommended only for measurements where the gas pressure is expected to vary little the gas 1s expected to be free of contaminants the gas temperature 1s within the operating specifications of the sensor and there is no chance of liquids coalescing Examples of applications suited for in situ installations are pure gases output of des iccant dryers for instrument air glove boxes etc For most other applications in situ installation should be avoided for the following reasons Sample conditioning is almost always necessary to avoid exposure of the sensor to liquid water and other contaminants such as hydrocarbons which may dam age the sensor or affect accuracy over time Variations in line pressure affect the reading of the sen sor because dewpoint varies with pressure If the gas line is under pressure it is more likely that water condensation occurs which may damage the sen sor page 5 LPDT User s Manual e Under a pressurized system removal of the sensor with out the installation of isolation valves can be dangerous If in situ installation is required bypass mounting is prefer able make sure to install the sensor at the upper surface of the gas line to minimize its exposure to liquid water should condensation occur the XTR65W sensor is best suited for these applications
31. ipment has been exposed OSHA Hazard Communication Standard 29CFR 1910 1200 mandated that we take specific steps to protect our employees from exposure to potential hazards Therefore a letter certifying that the equipment has been decontaminated must accompany all equipment exposed to hazardous contamination LPDT User s Manual page 46 Xentaur Corporation 3661 Horseblock Road Medford NV 11763 USA Tel 516 345 3434
32. libration method SpanCheck M sensor saturates at dewpoint above 68 F 20 C NIST NPL traceable multi point factory calibration available optionally 2 3 Sensor Installation amp Sampling Techniques Keep in mind that the moisture content at the sensor is not only due to the moisture of the gas being measured but also due to desorption of water from tubing trapped moisture at the interconnection points valves filters and other hygro scopic materials in the system leaks in the system and oth ers Thus the measurement may vary from the expectation and therefore care should be taken in choosing the sampling technique utilized in the measurement Factors such as gas pressure flow rate materials of construction length and page 4 Section 2 Sensor and Sampling Techniques diameter of tubing number of interconnecting fittings dead space in tubing and manifolds will influence the measure ment value and response time The high capacitance HTF sensors can be installed either directly in the line to be sampled in situ or in a slip stream of a sample system extractive To assure a long and accurate performance of the sensor it should be protected from contaminants such as liquids water oil etc and particulates The sintered stainless steel sensor encapsulation protects from particulates larger than 100 microns finer particulates e g from degraded desic cant or rust should be filtered with a part
33. lities the LPDT front panel may be rotated 3609 by gently pressing down on the spring loaded face plate and turning it to the desired position 3 4 2 Display Conventions 1 To display characters with the 7 segment numeric dis play the following pseudo alphanumerics are used Numbers 0 123456789 01234561839 Letters ABCDEF GH J LNOP QRS TUXYZ AbCGEFGH UL noP Gr 5tliizMe Symbols 9 n 2 The instrument will indicate whether a particular mode lets you change a parameter by showing the word SET in the upper left corner of the display Be careful page 17 LPDT User s Manual not to change any parameter inadvertently 3 C F appear simultaneously to indicate the sensors attenuation in decibels 4 Values larger than 1999 or smaller than 0 01 are dis played in powers of 10 As required either a 105 or 1073 will appear above and to the right of the dis played value the value will be rounded off to 3 2 digits The display will show rnb out of ranGe if the num ber to be displayed is larger than 1 999 000 Twelve examples follow for each the number and units desired to be displayed are shown in italics depicted immedi ately below them is the resultant 3 2 digit LCD display 1104 2 20 C 68 F 23 612 ppm V lbs H O mmSCF x103 c A EE ie c 36 PRM i iH DEWPOINT DEWPOINT DEWPOINT DEWPOINT LBS 17 688 3 grams H O meters 2 000 000 100 C 148 F n69 col 00 c HE DEW
34. n 3 Instrument 3 1 Precautions using the LPDT The LPDT uses state of the art microelectronics to provide a miniature full functioning instrument The user should consider the following precautions when using any sensitive electronic device Donot install the unit near heat sources such as radia tors or air ducts Donot install the unit in places subject to extreme mechanical vibration or shock If this is not avoidable use resilient mounting If in doubt call vour representa tive Observe the appropriate electrical safety codes and reg ulations If weather proofing is required consult your representa tive for an optional cover 3 1 1 Electromagnetic Compatibility Considerations The LPDT has been designed and verified by testing to meet the requirements of the EC Council EMC Directive 89 336 EEC for Industrial Scientific amp Medical eguip ment The sensor ground LPDT housing is isolated from the 4 20mA loop however they are also shunted with a 2000pF capacitor and a 33V Transient Voltage Suppressor this prevents electrostatic buildup noise pick up and in conjunction with the internal fuse protects the instrument from over voltage inputs Please consider the following electromagnetic interference issues during installation In order to provide an acceptable noise environment for the LPDT or any other digital equipment in the proxim ity of inductive loads it is recommended that there be varistors placed a
35. ng the provided connectorized cable The provided cable 1s terminated with a connector which has a retainer the retainer may be used to secure the connector to the LPDT thus avoiding accidental disconnection The LPDT will draw 4mA to 20mA from the power supply depending on the dewpoint being measured The dewpoints corresponding to 4mA and to 20mA are user selectable in between the current will vary linearly to the selected engi neering units see appendix G Various strategies for interfacing with the LPDT are shown in Appendix D Please observe good electrical safety and grounding prac tices when connecting any electrical equipment connecting one end e g negative of the power supply to earth ground is advisable After the installation is complete proper detection by the user s equipment of the 4 20mA output may be tested using the Analog Output test feature of the LPDT see section 3 4 5 6 page 16 Section 3 Instrument 3 4 Operating the Instrument 3 4 1 Starting up The instrument is readv for use as soon as the power cable is installed When power is applied the instrument will initial ize its program and for a moment display En then it will enter the Operating State If the MODE button is held pressed while the instrument is performing its power up ini tialization it will enter the Set Up State which allows the user to select operating variables of the instrument To accommodate a variety of installation possibi
36. ng the sensor OD 93 q uogenuege S9 HIX 001 1 d 10sueg soouo CAUTION These parameters are set properly at the factory to correspond to the shipped sensor Do not modify them Kejdsip ayeusaye ou SI 31944 xuejg SI JINEJOP A101984 A 4 du l 23 0 lt Sd EW D 981 lt gt Udd lt gt 4 YULI dsP TW jurodwep Bui ejdsip u uA moys O Silun SJBUJAJJB pessaid ION UHM AN JOMO4 JUSLUNJISUI p yoo e jo s um s GuiGueuo uaym sieadde 307 page 32 Appendices User Interface Flow Diagram Set Up State continued from previous page sobessau yuo pue yoeq UIUSEJJ umoys Ajayeusaye Om 1010 o pasn si ease ejdsip ay ul USEJS VZ uojinq y Guissaud JO jjnsau e se MO ay 19id p uoynq e mojaq wo no Buipe SMOJV 1 4N4541 Jun y 19831 JIM UOJNNQ s ll Jo ssed PON 1907 44 A V SI ynejap A109024 peBueyo aq jou ued sjejeurejed lu uunilsu pexoo ueuM jueuinaisui eui YDOJUN JO 4907 9 10 77 e A V 9 03 SI UNEJOP J0J9B4 indino Bojeue jo pue uiu o 5 jurodmop 19S 9 10 9 00 L SI JINEJOP AJOJOE4 ywoz usym OQAOL 90 01 1041 12 wnwiulw ensu3 gt O lt mano Gojeuy 1s L page 33 LPDT User s Manual ing I Draw ca LPDT Mechani Ap
37. onths for calibrations If damage is determined to have been caused by misuse or abnor mal conditions of operation the owner will be notified and repairs will be billed at standard rates after approval Maintenance Policy In cases when equipment fault is suspected please notify your representative of the problem be sure to provide them with model and serial numbers If the problem can not be resolved then ask for a Return Authorization Number RAN and shipping instruc tions Issuance of an RAN does not automatically imply that the equipment is covered by our warranty that will be determined after we receive the equipment Pack the equipment in a suitable box with sufficient padding include the RAN number on your paperwork and send the equipment prepaid to the designated address Xentaur will not accept equipment returned without an RAN or with reversed shipping or import export charges If the warranty has expired or the damage is due to improper use or exposure of the equipment then Xentaur will provide an esti mate and wait for approval before commencing repairs For your convenience a Return Authorization Request Form is provided in appendix J it must be filled out and sent back to Xen taur in order to obtain a RAN LPDT User s Manual LPDT User s Manual Table of Contents 1 0 Overview of the LPDT 1 2 1 Precautions using the sensor
38. pendix C U9U9JM 8 10 SPE 1 750 SET WD ISd l1NIOdM3G 3 9 HV dAW3L Wdd 8 8 8 I OH 801x 13S YNVLNAX 00970 Mo Se Mal www xentaur com oint Transmitter JSUIEJ81 UO M9J0S YDE JAMO OEZ N Ne wwz X WP 9L v Jeusew UOISU9 ve u9 L S NS a ul O v UYA ls ssejurejs POJSJUIS ri00 u e nsdeou 10sueg SIQEAOWSH page 34 Appendices Appendix D LPDT Electrical Connections Methods of Using and Interfacing the LPDT Operation with Wall Transformer Dewpoint viewed on Instrument Displav 10 33VDC c hd Operation with DC Power Supplv Dewpoint viewed on Instrument Displav and available as 4 20mA output Mi maintain 10 33VDC here 4 20mA VDC Operation with Relay Option Board Dewpoint viewed on Instrument Display and available as 4 20mA output Relay Option Board Provides two independent Relays with programmable trip point and hysteresis DC or AC supply Operation with Remote Option Board Dewpoint viewed on Instrument Display and available on remote Display Buttons Relays Voltage or Current Output RS 232 Output Power Supply 85 265VAC Operation with DC Power Supply D
39. riations in line pressure The risk of exposing the sensor to liquid water 1s signif icantly reduced ppm readings are computed for a pressure of one atmo sphere 1 bar and have to be corrected using software in the instrument or a pressure nomograph or calcula tor if the sensor is measuring at different pressures If readings at line pressure are necessary it is recommended to measure at ambient pressure and to use the instrument s pressure compensation feature to calculate the dewpoint at line pressure See appendix F Please make sure that The sample is taken from the upper surface of the main gas line This avoids problems with contamination The sample should be taken away from pipe line walls where flow rates may be low and dewpoint changes may lag For dewpoints dryer than 40 F use stainless steel tub ing only Copper tubing is acceptable for dewpoints wet ter than 40 F Do not use plastic rubber or tygon tubing under any circumstances as measurements would be incorrect and or response time slow due to water reten tion inside these materials Try to run pipes to the sensor upwards so that contami nants tend to fall back into the main line Keep the length of the sample line to the sensor as short as possible Use small diameter pipes 1 4 or 1 8 OD Use sufficient flow rates e g 1 l min with 6 feet of 1 8 piping is adequate The flow rate will influence the sys tems response time pag
40. sed in the context that this is the pressure at which the dewpoint is to be calculated Pressure Correction is used in the context that the values displaved signifv the moisture content at some pressure we refer to this as the Gas Pressure different from the pres sure at the sensor Note that PPM LBS and G M readings are bv definition unaffected bv pressure correction because only the pressure at the sensor affects their value While C and F are affected bv pressure correction bv reporting what the dewpoint would be at the Gas Pressure when the dew point is what is measured at the pressure at the sensor How ever this also implies that whether pressure correction is applied or not the PPM LBS and G M readings are affected by the setting of the sensor pressure The factory default settings are 14 7psi for both sensor and gas pressure and pressure correction disabled When Pressure correction is disabled all dewpoints are computed by assuming that both Sensor and Gas Pressures are 14 7psi As all Xentaur dewpoint meters the LPDT is equipped with the necessarv software to perform pressure correction However for the lack of space the LPDT does not have a Pressure Correct button Therefore the user can not set or enable Pressure Correction this must be done at the factory Consult with your representative page 39 LPDT User s Manual Appendix G Current vs Dewpoint The current being pulled by the LPDT varies wi
41. sor is not known contact your repre sentative and follow the instructions in paragraph B on the next page If the value is not available then it may be derived using a manual method provided that a moisture calibration lab is available The calibration must be done in the range of 25 C to 20 C attempting to calibrate outside this range may cause inaccuracies the dewpoint must be kept stable during calibration and it must be measured accurately by areference instrument such as a chilled mirror One must also note the state of pressure compensation and turn it on or off as applicable to the reference The necessary steps are described below also refer to the Set Up State flow diagram in Appendix B a Make sure that the low attenuation and low dewpoint are correctly entered for this sensor b SpanCheck the sensor c Dry down the sensor for at least 12 hrs d Expose the sensor to the known dewpoint 25 C to 20 C for a sufficient time at least 30 min e Go to the LAL Adu mode and press the UP button the display will show the current value in the range of 1 99 to 1 99 followed by blinking horizontal lines page 26 Section 3 Instrument f Observe the displav if the buttons are not being pressed the displav will everv few seconds show fora short duration the dewpoint as being computed at the moment utilizing the current cal adjust value in the computation g Use the UP or DOWN buttons to modify the
42. t how to create such micro climates A perfectly acceptable and accurate for calibration micro climate may be created for the XTR100 and XTR65 sensors by cupping the sensor in the palm of one s hand during the SpanCheck procedure Remember that the micro climate does not have to be accurate 1t just has to be higher than the designed saturation level The dewpoint of the micro cli mate within the fingers is usually higher than the dewpoint of the room air and probably well above the 20 C upper range of the sensor On a dry day one may need to exhale in the hand before cupping the sensor to guarantee a high dew point The sensor should be warmed up close to body tem perature before performing this procedure Care must be page 23 LPDT User s Manual taken that the sensor temperature is not below the tempera ture of the hand as in such case condensation could occur and super saturate the sensor For the same reason avoid exhaling directly onto the sensor 3 4 4 4 Viewing Serial Number Mode In this mode the user can view the serial number of the sen sor calibrated and shipped with the instrument This number is also engraved on the stainless steel sintered filter of the sensor element The display shows the serial number by alternately displaying z5n and the number If the number is larger than 1999 then it is displayed in 2 parts first part is the thousands signified by the x10 legend in the upper right corner of the displav
43. t of spec E N 3 Lo b t Low supplv voltage 2 check input voltage 10 33VDC o LO enb Instrument low temperature range TEMP has been exceeded make sure that the unit is ata 5 HI aL Instrument high temperature range gt temperature of 10 C to 70 C TEMP has been exceeded oPn Sensor circuit is open see table in 2 SRE Sensor is saturated E sensor troubleshooting E SHE Sensor circuit is shorted z section 2 Trying to calculate dewpoint for 3 select sensor and undefined sensor SpanCheck db Trying to calibrate an undefined 8 see Calibration instructions sensor 8 SEn 2Lo Sensor reading is too low to be a satu E rated sensor for SpanCheck 8 Ere EEP EEPROM write cycle not completed if this persists return for service Lot Attempting to modify a locked unit unlock unit see set up mode coh number can not be displayed in 3 5 digits E 100 942 An XTR 65 sensor is measuring less E w flashing than 70 C or 94 F dewpoint m DEWPOINT 5 PSI flashing Pressure correction is enabled when dew zEn Turn on message Kentaur Greek E X Legend denotes alternately flashing messages page 29 LPDT User s Manual The instrument contains a fuse which may open if the instrument is subjected to voltages exceeding the specifica tions Under these circumstances the unit display will be blank and the instrument will not draw any current when powered up The fuse is not user replaceable
44. th the dew point being measured by the LPDT To use the current to calculate the value of the dewpoint measurement one must know the settings of the low and high ends of the analog output range then U 4 x H L Te 7 where 7 current drawn by LPDT loop in mA H value of High end of Analog Output range converted to selected engineering units L value of Low end of Analog Output range converted to selected engineering units D dewpoint measured by instrument in selected engineering units Consult section 3 4 5 7828 and or appendix B to check and set the Analog Output low and high ranges the factorv default settings are 100 C and 20 C respectively For example a unit with factory default settings drawing 12mA is computed to be measuring a dewpoint of 40 C D L 2 2 x 9 C100 100 40 6 Note that the computation is such that the current is linear to the selected engineering units Hence selecting ppmV or LBS or G M3 units will cause the analog output to be lin early proportional to those units approximately logarithmi cally proportional to dewpoint refer to the graph that follows Naturally selecting C or F will cause the analog output to be linearly proportional to dewpoint When monitoring in ppmV or LBS or G M3 the analog output low K high ranges may have to be adjusted to pro page 40 Appendices vide a useful output Consider an example where the area of interest to be monitored is 10
45. therefore the LPDT must be sent to your representative for servicing page 30 Appendices Appendix A Operating State User Interface flowchart 30 seconds anvwhere other than calibration without a kev press Power ON initialization and sign on message O XENTAUR LPDT PSI leges PSI legend ses 8 means pressure correction is being applied see appendix F a XENTAUR oo Vievving Devvpoint XENTAUR LPDT Day select units Cancel Calibration calibration values are not changed Viewing Sensor Temperature minute select units Calibration Menu XENTAUR LPDT numbers calculating Viewing Serial Sp Number S o SH Press together to E 1 RESET the Instrument 22 Then quickly press and hold 85 MODE to go to Set Up State LEGEND 1 Arrows leading out from below a button depict the flow as a result of pressing the button 2 Arrows leading out of other locations depict flow as a result of completing a function or a time out 3 A slash in the display area is used to depict two alternately shown flashing back and forth messages page 31 LPDT User s Manual Set Up State User Interface flowchart Appendix B SHUN 1070 SS JUBWOW B 10 UMOUS SI N D ay Spuooes 10 passed suolinq ou AV CO jsn py SDUEJPIJN uone4qieo 2 V0 DONNE seo unless you are replaci
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