COSA Xentaur HDT Dewpoint Transmitter Manual PDF
Contents
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6. v jueuidinb3 2 UOISIAI III 8860 40 ejqeuins 9 2 4 3 SANOIY Z II 55219 40 o qeuns 44 doen zug 2 q g y sdnoio 5510 IN f v3uv 4 55 1 snoauvzvH aed 101070590 26 Appendices DECLARATION OF CONFORMTY x ATEX C 0539 We declare under our sole responsibility that the following products Xentaur dewpoint sensors series XTR to which this declaration relates are in conformity with the protection requirements of Council Directive 94 9 EC ATEX Directive on the approximation of the laws of the Member States concerning equipment and protective systems intended for use in poten tially explosive atmospheres and 89 336 EEC EMC Directive as amended by 92 3 and 93 68 EEC on the approximation of the laws of the Member States relating to Electromagnetic Compatibility The models covered by this Declaration and evidence of conformity with the ATEX Directive are Xentaur XTR series dewpoint sensors Conformity to the ATEX Directive is in accordance with the following Euro pean standards EN 50014 1997E incl 1 2 Electrical Apparatus for Potentially Explosive Atmospheres General Requirements EN 50020 2002 Electrical Apparatus for Potentially Explosive Atmospheres Intrinsic Safety i EN 50284 1999 Special Requirements for Construction Test
7. 0 56 lt lt lt lt lt 5 E E E 5 4 20 mA output page 30 Appendices Appendix Uncertainty in LBS amp ppmV calculations 48 1000 44 900 38 800 34 700 29 600 24 500 19 400 e 15 300 S 2 8 10 200 G a c 2 a 5 100 5 9 70 to E 60 lt F 2 5 50 8 40 E a o o 28 3 t z 1 8 8 2 8 3 2s o 9 20 E 0 10 9 E 8 7 0 6 0 25 5 5 gt z gt 4 5 2 5 S 2 0 05 1 0 9 08 07 06 05 5 8 8 8 F 9 8 8 8 8 R B Y R ru F S Measured Dewpoint page 31 HDT User s Manual ime Sensor Response T Appendix I seinuiu 001 S6 06 98 08 GZ 04 99 09 99 OS 9 56 06 9 06 SL OL S 0 pessa deis Jo 66 oDueuo deis 69 winuguinba jo 194e 2 29 o euin ye 62 Woy NM OQ eBueuo deis 2 oj 5 0849 COSIV 1nejuex jo SOL 001 96 06 S8 08 SZ 02 S9 09 SS 08 Sv 07 95 0 Sc 0 91 01 of step change page 32 Appendices Appendix J Return Authorization Request Xen
8. LO Main Extractive Installation Sensor Gas Line Measuring at Line Pressure Regulator or Needle Valve Extractive Installation Sensor Gas Eine Measuring at Ambient Pressure It is generally recommended to measure at ambient pressure for the following reasons The readings will not be affected by variations in line pressure The risk of exposing the sensor to liquid water is signif icantly reduced page 7 HDT User s Manual ppm readings are computed for a pressure of one atmo sphere 1 bar and have to be corrected using a pressure nomograph or calculator 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 our dewpoint cal culator to obtain the dewpoint at line pressure 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 upwa
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10. ewpoi L es nt Trans 9 ot USER S mas oration cor Xe nta HDT User s Manual When calling your representative for technical support please have your serial numbers available The Sensor and Instrument Serial Numbers are engraved on them 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 DPT 00 D 1068 Rev 1 8 11 05 Copyright 2005 by Xentaur Corporation HDT 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
11. 40 Note that the computation is such that the current is linear to the selected engineering units Hence ordering a HDT with ppmV or LBS or G M3 units will cause the analog output to be linearly proportional to those units approximately logarithmically proportional to dewpoint refer to the graph that follows Naturally selecting C or F will cause the ana log output to be linearly proportional to dewpoint When monitoring in ppmV or LBS or G M3 the analog output low amp high ranges may have to be adjusted to pro page 28 Appendices vide a useful output Consider an example where the area of interest to be monitored is 10 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
12. 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 Wet Reading return sensor for full calibration to your representative Cure the leak or replace unsuitable pipe with copper or stainless steel Flexible con 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 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 Remove unscrew sensor if the current does not change even momentarily then the problem is with the instrument otherwise the problem may be with the sensor Check sensor connection or replace sensor page 11 HDT User s Manual page 12 Section 3 Instrument 3 1 Precautions using the HDT The HDT uses state of the art microelectronics to provide a miniature full functioning transmitter The user should con sider the following precautions when using any sensitive electronic device Do not install the unit near heat sources
13. Weather proofing gasket Retention screw The connector is keyed with a wider earth ground pin The HDT 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 via the HART interface in between the current will vary lin early to the programmed engineering units see appendix G page 16 Section 3 Instrument Various strategies for interfacing with the HDT 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 verified by confirming the measurements in the first few seconds after power up refer to Appendix A 3 4 Operating the Instrument 3 4 1 Starting up The instrument is ready for use as soon as the power cable is installed When power is applied the instrument will initial ize its program refer to timing diagrams in Appendices A amp B then it will enter the Operating State 3 4 2 HART Interface The HDT is HART compliant The Serial Num on the HDT body is its HART address The HDT implements the full Common Command Set in addition to commands xxxx The full HART specification is available from the HART Com munication Foundation at http www hartc
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16. uey 40 esn jou snjeseddy 5 pejoeuuoo jueuudinbe joquog 1ndjno jeeui eq 160 pejeroossy ay 10525 qujodmag Teuonddo punos6 4409 02 eiqeo Sog jeueg nejuex 6 3 jueuidinbe papiaoid 1 10 Jeuio sno Jeq sng paniesqo oi sored name T E ayes jjeorsuuiu 1ueuudinb3 snyeseddy pejeioossy 981271 O 0p 91 A9 EIL 3 pue alll 0 euoz 1 5580 S8 80889 2 jueique 9 56818719 jueique 5 081691 pue eg udeib sod aai3issviONf ssero SI 88 SO Z e parepdn L 5120 5 79H V3uv SNOGYVZVH SUOISIA9H page 25 HDT User s Manual Certifications Approvals Conformity cont Appendix E 810 619945 WIN 91299 TUMEX 2v0 Q 00 1dQ 3215 ees s renaren suoneoo 0 snopreze 6 JON snjereddy 0 JUIOdmag seues qH 1 enuy
17. with the installation use and maintenance of ana lytical or process instrumentation HDT User s Manual Warranty Xentaur instruments are warranted to be free from defects in workmanship and materials Liability 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 e year for electronics year for mechanical failures to the sensor e six months 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 instructions Issuance of an RAN does not automatically imply that the equipment is covered by our warranty that will be deter mined after we receive the equipment Pack the equipment in a suitable box with sufficient padding include the RAN number on your paperw
18. Input resolution Indicators Engineering units Arms Isolation 22 222222 4 Approvals Classifications Technical Specifications Stainless Steel 25 Dia x 5 68 long including sensor amp connector see appendix C 0 516 Standard 500 PSI 34 bar Optional 5 000 PSI 340 bar 22 F to 185 F 30 C to 85 C 14mm 1 25mm threads 3 16 threads may be outfitted with other threads upon request Industrial Standard 9 4mm 4pin connector IP65 Two conductor min 24AWG for total cable length gt 5000ft min 20AWG cable must be shielded to meet CE requirements for ambient temperatures above 60 C assure that wiring tem perature rating exceeds the maximum expected ambient tem perature 5 VDC min to 28 VDC max the instrument draws 4 20mA depending on measured dewpoint 0 1 C dewpoint none factory programmed C F ppmV LBS H5O mm scf gm H O m ppmW water vapor pressure HART interface user s selections are stored in EEPROM Analog and digital outputs are available A 4 20mA drawn by the instrument from the power supply The 4 20mA is linear to the engineering units the range is programmable Output resolution is 0 1 C dewpoint or 0 25 whichever is greater B The instrument can supply digital output by modulating the 4 20mA loop line The interface is de
19. it is available free of charge The HDT is light enough such that either thread will mechanically sup port the whole instrument To prevent any leaks tighten the HDT into the sample cavity with a 1 wrench 1 8 turn past finger tight to assure metal to metal contact do not exceed 15 foot pounds The sensor can be removed from the HDT by unscrewing it Make sure that the sensor is securely fastened to the HDT the tension washer should be compressed so that it does not come loose during use do not overtighten because the sintered material will break 3 3 2 Electrical Installation The HDT will operate properly with 5VDC minimum to 28VDC maximum at its input if this voltage is exceeded the internal fuse may open this fuse will self reset after a page 15 HDT User s Manual cooldown time When selecting the power supply voltage do not neglect the voltage drop across any current measure ment resistor and wiring in the loop The connector is an Industrial Standard 9 4 mm 4 pin connector IP65 NEMA 4X Please observe connector polarity when plugging in the HDT cable Please align the wider earth ground pin marked 7 to the wider slot on the connector marked Note that the wider slot is on the same side of the connector as the cable grip stem Make sure that the weatherproofing gasket 18 seated flat against mating surfaces Do not force the con nector When the connector engages secure it with the retention screw
20. 5 Troubleshooting the Instrument 17 Appendix A HDT power on sequence timing diagram 19 Appendix B HDT pin 3 timing diagrams 20 Appendix C HDT Mechanical Drawing 21 Appendix HDT Block Diagram amp Connections 22 Appendix E Certifications Approvals Conformity 24 Appendix G Current vs Dewpoint 2 22 28 Appendix H Uncertainty in LBS amp ppmV calculations 31 Appendix I Sensor Response Time 32 Appendix J Return Authorization Request 33 HDT User s Manual vi Section 1 Introduction 1 0 Overview of the HDT The HDT is a microprocessor based 4 20mA loop powered 2 wire hygrometer for measuring moisture content in gases or liquids in a wide range from 100 C to 20 C dew point in gases and 0 ppmW to 1000 ppmW in liquids The measurement is transmitted by varying the current drawn 4 20mA from the power supply The current varies lin early proportional to the selected measurement units In addition a digital output modulates demodulates the 4 20mA loop line without interfering with its operation and adheres to the HART protocol Thus the HDT is capable of communicating with properly equipped Personal Computers or other RS 232 or HART capable controllers The HDT s advanced design allows it to be housed in a small stainless steel enclosu
21. and Marking of Electrical Apparatus of Equipment Group II Category 1 G NEMKO 05 Factory Mutual EEx ia T6 Xentaur XTR series ATEX NEMKO dewpoint sensors and 0505798X HDT transmitter The authorized signatory to this declaration on behalf of the manufacturer and the Responsible Person is identified below Xentaur Corporation 202 84 Horseblock Road x Yaphank NY 11980 USA Bedros Bedrossian manufacturing location Standards amp Approvals Engineer Issue Date 21 March 2005 page 27 HDT User s Manual Appendix G Current vs Dewpoint The current being drawn by the HDT varies with the dew point being measured by the HDT To use the current to cal culate the value of the dewpoint measurement one must know the settings of the low and high ends of the analog output range then 4 a L where I current drawn by HDT 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 A HART communicator is required to check and set the Analog Output low and high ranges the factory default set tings are 100 C and 20 C respectively For example a unit with factory default settings drawing 12mA is computed to be measuring dewpoint of 40 C 12 4 x 20 100 T 100
22. loop draws 21mA However it is also possible to configure it to 4mA 20mA 3 8mA or to hold last out put page 18 Appendices iagram d iming HDT power on sequence t Appendix A oos our 87 vc 18 Aes 00 8 4007 0c 9I 8 v is LAVH 8 o quumqo st eq dniomod jo spuooos c ura 0 5208 doo pue LAH 9ui pessed q 81 189 doo st LAH JI 5 01 8 8 1 2 Supeo 801 001 Jo 2506 298 10 4 8 6 18 Avjs 29 2 WOdHH 225 8 10 298 8 10 ssoJoe 1889 1 Ajprqedeo juatoryyns pue JO st juouno uou ijnejop 10196 51 88 gursso1ppy PUNON Ut ST LAH Ot JI Ol 41014818 uo 4 doo LAH 10 ure18erp pue uorsroo q 19 HDT User s Manual iagrams d HDT pin 3 timing Appendix B Sui eusts 19470 uonrpuoo
23. loop output will be 4 55 to 14 48 mA in the range of 10 to 100 ppmV 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 specifics and some one will get back to you with appropriate analog output settings In general if the dewpoint is monitored in 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 29 HDT User s Manual Relationship of 4 20mA output and instrument reading in ppmV or LBS e B 289 1 LBS 0 6063 8 ppmV g 9 8 2 5 49 3 LBS 20 C 1019 3 9 5 gt S c O amp o 2 gt 200 a m c 0 o BS 2 2 5 1 97 LBS 50 C 38 83 ppmV
24. 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 The Xentaur Logo is a trademark of Xentaur Corporation HDT User s Manual Examine the HDT package for damage or mishan dling If any damage is evident notify the carrier and request an inspection Unpack the box it should contain The HDT with sensor in desiccant container a mating connector 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 HDT Section 2 describes the sensor and sampling tech niques Section 3 describes the instrument s electrical and mechanical interfaces This manual is intended for those already familiar
25. such as radia tors or air ducts Do not install the unit in places subject to extreme mechanical vibration or shock If this is not avoidable use resilient mounting If in doubt call your representa tive e Observe the appropriate electrical safety codes and reg ulations 3 1 1 Electromagnetic Compatibility Considerations The HDT 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 equipment The sensor and the 4 20mA loop are electrically connected however they are isolated from the HDT housing and sam ple cell fitting threads refer to Appendix D Please consider the following electromagnetic interference issues during installation In order to provide an acceptable noise environment for the HDT or any other digital equipment in the proximity of switching inductive loads it is recommended that there be varistors placed across the inductors to keep down the high voltage spikes during transitions e Circuitry 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 page 13 HDT User s Manual HDT and its wiring as practical 3 2 Instrument Enclosure Pressure operating range Operating Temperature Electrical connections Cable dA e
26. fined by HART In the digital mode the HDT can be remotely operated the dew point amp temperature can be read Multiple units can operate on the same loop cable as a multi channel instrument The 4 20mA signal or the digital output may be used by an external device to operate relays In addition a digital output pin is provided which can be factory programmed to provide dewpoint alarm indications Sensor is connected to the current loop but isolated from the HDT housing and installation threads CE for electromagnetic compatibility accredited laboratory tested and certified FM approved for use in Hazardous loca tions and NEMKO ATEX approved when installed per draw page 14 Section 3 Instrument ing DPT 00 D 7042 refer to appendix E 3 3 Installation 3 3 1 Mechanical Installation The HDT has two thread sizes refer to Appendix C for mounting to the sample cavity consult the sensor installa tion 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 4 x16 thread is used then the HDT will seal against the wall of the sample cell with the provided Viton A O ring If the 14mm x 1 25 spark plug thread is used then an additional Viton gasket must be installed to provide the proper seal Ask your representative for this gasket
27. h as ones containing Chlorine Ammonia or SO can be moni tored when the moisture content is low Cyanide Br I and HNO may harm the gold layer of the sensor thus limiting sensor life Except for the XTR 60 and XTR LQ sensors 1 Do not expose the sensor to liquid water as it may get damaged 2 Do not breathe directly onto the sensor as condensation may form which could damage the sensor element Do not install the sensor near heat sources such as radiators 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 representative Do not disassemble the porous metal filter encapsulation as this will damage the sensor and void your factory warranty Prior to installation of the probe ensure that no contaminants are present in the system e g oil liquid water page 3 HDT User s Manual 2 2 Sensor Technical Specifications Type Hyper Thin Film high capacitance Al O3 Dewpoint range 100 148 to 68 100 C to 20 C 65 85 F to 68 F 65 C to 20 C XTR 60 ehe 76 F to 68 F 60 C to 20 C secs for use in liquids Capacitance 15nF to 200nF Accuracy 5 5 F 3 Repeatability 0 9 F 0 5 0 Response time see graph in Append
28. ix I Temperature range 10 C to 70 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 100p sintered stainless steel Calibration method NIST NPL traceable multi point factory calibration 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 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 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 page4 Section 2 Sensor and Sampling Techniques water oil etc and particula
29. nd consider the possible causes and appropriate diagnostic action and rem edy page 9 HDT 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 Unsuitable sample pipe material 5 Leaks 6 Hygroscopic materials in sample system Dry Reading Wet Reading faulty sensor Leak in system or use of unsuitable pipe Comparison of readings with manual cooled mirror instrument current loop outside of 4 20mA range 1 Prolonged exposure to wet gas 2 Instrument Failure 3 Short circuited sensor 4 Open circuit on sensor 5 Instrument failure 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
30. omm org 3 5 Troubleshooting the Instrument This instrument performs diagnostic tests on power up as well as once every three seconds The table that follows depicts possible error unexpected indications that may occur For each indication the table has explanations for the reason and if necessary a suggested action to remedy it page 17 HDT User s Manual Symptom more than 25 sec after powerup Possible cause Remedy Current Pin3 Loop High Instrument failure Cycle power if prob impedance EEPROM checksum lem persists return failure instrument Fixed at 3 8mA Check power supply s Loop voltage insuffi capability to maintain cient at least 5V at 20 mA see appendix A Fixed at Check sensor amp cycle power if problem 21mA 2 shorted sensor sists return instrument 4 to 20 mA Intermittent Normal Operation V 3V 1 4 Measurement below HART Command 15 Fixed at RS 232 data Primary Variable Ana 4mA log Output Lower Range Refer to sensor section Measurement above XXX HART Command 15 Fixed at Primary Variable Ana 20mA log Output Upper Range High 1 Cable open 1 Check cables OmA 2 Fuse open due to 2 Wait for self reset impedance excessive voltage ting fuse cooldown Note 1 in the factory default mode the HDT is setup using HART Alarm Selection Code ref Universal command 15 such that when there are errors the current
31. ork and send the equipment prepaid to the desig nated address Xentaur will not accept equipment returned with out 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 HDT User s Manual HDT User s Manual Table of Contents 1 0 Overview of the HDT obit 1 2 1 Precautions using the sensor eere 3 2 2 Sensor Technical Specifications 4 2 3 Sensor Installation amp Sampling Techniques 4 2 3 1 In situ UIROS Hr 5 2 3 2 Extractive Installation 6 2 4 Troubleshooting unexpected readings 9 3 1 Precautions using the HDT 13 3 1 1 Electromagnetic Compatibility Considerations 13 3 2 Instrument Technical Specifications 14 3 3 ATION 15 3 3 1 Mechanical Installation sees 15 3 3 2 Electrical Installation aeree 15 3 4 Operating the Instrument eere 17 Sud 18tarting esee qi en pet 17 E 17 3
32. rds 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 Do not 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 page 8 Section 2 Sensor and Sampling Techniques e 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 hygroscopic 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 This comparison can be performed utilizing a HART communicator The two should be the same if they are not the instrument may not be calibrated with the installed sen sor To troubleshoot other problems identify the unexpected reading category in the following table a
33. re behind the sensor probe thus the instrument and sensor are a single integrated unit The HDT uses the Xentaur HTF sensor which is encapsu lated in sintered stainless steel thus it is capable of coming into contact with a wide variety of environments However one should keep in mind that the sensor is a sensitive device and it should be handled accordingly page 1 HDT User s Manual page 2 Section 2 Sensor and Sampling Techniques 2 1 Precautions using the sensor The Xentaur HTF A150 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 condensation Close the con tainer 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 certification 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 or liquids suc
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35. taur must approve and assign a return authorization number RAN to any instrument being returned The RAN must appear on all paperwork and packag ing The issuance of a RAN does not automatically imply 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 631 345 5349 Customer Information Company Name Address Contact Name Phone Fax Equipment Information Part or model number HDT 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 equipment 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 hazard ous contamination HDT User s Manual page 34 Xentaur Corporation 84 Horseblock Road Yaphank NY 11980 USA Tel 631 345 3434
36. tes 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 particulate 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 is expected to be free of contaminants the gas temperature is 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 e 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 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 If in line installation is req
37. uired 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 XTR 60 sensor is best suited for these applications Also consider the need to isolate depressurize before installing page 5 HDT User s Manual or removing the sensor 4 20mA loop cable In Line Installation Sensor Measuring at Line Pressure NOT RECOMMENDED Main Gas Line Bypass Installation Sensor Measuring at Line Pressure Safety shut off Valve Control Gas Line maintain differential pressure to provide adequate flow through sample cell 2 3 2 Extractive Installation For extractive installations we recommend our sample sys 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 page 6 Section 2 Sensor and Sampling Techniques 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 Exhaust HDT Regulator or Needle Valve Safety shut off Valve le Cell
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