Easidew Dewpoint Transmitter User`s Manual
Contents
1. micrometer meters per second milliampere maximum millimetres megapascal normal liters per minute Newton meter ounces parts per million by volume pounds per square inch relative humidity standard cubic feet per hour standard cubic feet per second temperature Volts Ohms diameter The following general warning listed below is applicable to this instrument It is repeated in the text in the appropriate locations Where this hazard warning symbol appears in the following sections it is used to indicate areas where potentially hazardous operations need to be carried out Issue 9 1 December 2012 Easidew Transmitter User s Manual INTRODUCTION 1 INTRODUCTION The Easidew dew point transmitter has been manufactured tested and calibrated to the highest available standards and should be in good working order ready for installation into a gas measurement application If there are any questions about the instrument or how to install and operate it please contact a Kahn representative for Kahn Instruments contact information go to www kahn com 1 1 Features The Easidew dew point transmitter is a continuous on line 4 20mA transmitter for the measurement of moisture content in air and other non corrosive gases The key features are 4 20 mA 2 wire loop powered connection e Dew point OR parts per million moisture content in volume ppm measurements o Accuracy 3 6 Fdp 29Cdp Repeatabil2. CAN CSA C22 2 No UL61010 1 2nd Edition Kahn Instruments 13 APPENDIX C Easidew Transmitter User s Manual Appendix C EC Declaraton of Conformity SSS an 14 Issue 9 1 December 2012 Easidew Transmitter User s Manual APPENDIX C Appendix C EC Declaration of Conformity EC Declaration of Conformity MICHELL instruments Manufacturer Michell Instruments Limited 48 Lancaster Way Business Park Ely Cambridgeshire CB6 3NW UK We declare under our sole responsibility that the product Easidew amp Easidew 34 Dewpoint Transmitter complies with all the essential requirements of the EC directives listed below 2004 108 EC EMC Directive Using the standards EN61326 1 2006 Electrical equipment for measurement control and laboratory use EMC requirements Group 1 Class B emissions and immunity and has been designed to be in conformance with the relevant sections of the following standards or other normative documents EN61010 1 2010 Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use Part 1 General Requirements ce m Andrew M V Stokes Technical Director Date of Issue Sept 2012 Kahn Instruments 15 http www kahn com
3. Easidew Dewpoint Transmitter User s Manual Kahn Instruments Inc 2015 This document is the property of Kahn Instruments and may not either in part or whole be copied or otherwise reproduced communicated in any way to third parties nor stored in any data processing system without the written authority of Kahn Instruments Inc Contents SEE a AA PIE EE PE EEE AE A PETE E E EE A EEE N E A E E E E iii ERE ES A E E iii aoso ac pecs easier E st nicecunseaiee cout ncdseaeetes outans tice E A Eee iii WG TU alls aane EEEE EEA ETA jii Repair and Maintenance iissscucsievisosis lt esunenvivasicercrsnseantabusenaadbasasseveebbananeiaeieanebocaetennsedens lil E EES a PEA E A E A E N evinces ase E A E A TT jii A a E E iii POV IONS ois E A E snvea tance A acre A AEA E E E T iv U I E SEE FEE A a a Ene eee eee IV OG TO Wise SU sienna cee caeeruateaneaticsiaasine ueasnoaeae meanness snaavenanscaueenatieneenenneess 1 CL RCS cage eee segesecese ceca see E EE E sage seecee 2 E 4 ress aeaneoseeeeteas 1 2 INSTALLATION ecnanisicncimabatennn cuateiazaenesensacenasiaaneiaheuateaapnsasaconsandaapaentannciecesaeiiereain 2 2 1 Unpacking the Instrument ssssseseseeee eee t test ELLLER LEE REEL ELSE NELS E TELE TEE EEN ELERS E NEN 2 2 2 Preparation of the Sensor Cable secatacusssocsncacnbanntadweunseindemesanerolsbepreimindecamesemumeatnores 3 Zee DIO COA AE EON Ea E A TA E 4 r 916 6 C s Bele 14 oa re cer ee a en ee ee ee ee 4 2 4 1 Ele
4. arly important at low dew points since other materials have hygroscopic characteristics and adsorb moisture on the tube walls slowing down response and in extreme circumstances giving false readings For temporary applications or where stainless steel tubing is not practical use high quality thick walled PTFE tubing Position Transmitter away from Heat Source It is recommended as good instrumentation practice that the transmitter be placed away from any heat source to avoid adsorption desorption Issue 9 1 December 2012 Easidew Transmitter User s Manual MAINTENANCE 4 MAINTENANCE Calibration Routine maintenance of the Easidew is confined to regular re calibration by exposure of the Easidew to sample gases of known moisture content to ensure that the stated accuracy of the Easidew is maintained Calibration services traceable to the National Institute of Standards and Technology NIST are provided by Kahn Instruments Kahn Instruments offers a variety of re calibration and exchange sensor programs to suit specific needs A Kahn representative can provide detailed custom advice for Kahn Instruments contact information go to www kahn com Sensor Guard Replacement The sensor is supplied with a white HDPE guard standard or a stainless steel guard if specified at time or order The method of replacement is the same for both types HDPE Guard The HDPE guard provides lt 10um protection to the dew point sensor It is
5. ctrical Boundaries sayaeaan cnnvcevssnchmuseransnenreuisaneuuibeareeekeaneinsann EEE E aAA ai 5 AS An mMer MOUNN cerises aaar Eaa 5 2 5 1 Transmitter Mounting Sample Block Optional cscsscecseeersecerssearenearsneaeens 6 2 5 2 Transmitter Mounting Direct Pipeline Connection s ssssssesesesnsnsnsnnrrrnrrrrerenne 7 3 OPERARON irren ETE 8 T PIN Ce asa E E RE 9 Figures Figure 1 Transmitter Unpacking Method s ssnsnnnnenenensnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnrnnnrnnnnnnene 2 Figure 2 Connector Terminal Block Removal usssssccsceccsceccenecnunecceneceensceenecuneceeneceeneneess 3 Figure 3 ANNE CONECO Er er On Peer tee Sener rere en een ener ea rr 3 Figure 4 Connector 1MStallaliON sriid irrin iann EAEE 4 Figure 5 22W rE Ge aipia adie Daga eisai rer rere re err rere ren rere rere ater RR 4 Figure 6 Maximum Load of Easidew Including Cable R SIStANCE scsssssesssceseeceseeeees 5 Figure 7 TAS eer Mounting Sensor BIOK oa 6 Figure 8 Trenemitter MOUNTING FIDE OF DUGE acces sete henses r ERE Figure 9 PGT OCA porre 8 Figure 10 Indication of Dead Space sscncstictscerratsansensascdeniberanncnsieenentieeserieieaveneondecncsereees 8 Figure 11 Replacement of HDPE GUAE sr 9 Figure 12 DIMENSIONS lt ESSEN ESSEN a ni 12 Appendices Appendix A TECHNICA PENCON siririn nK AEA EEEE 11 Appendix B UE Coria O iaeei inini iniia e 13 Appendix C EC Declaration of Cano ao i a E eer re rere 14 2 Issue 9 1 December 2012 Easidew Transmitter User
6. designed to show any contamination and the guard should be changed if the surface becomes discolored When replacing the guard care should be taken to handle the guard by the bottom part only Replacement guards EA2 HDPE pack of 10 can be obtained by contacting Kahn Instruments www kahn com HANDLE USING GLOVES BY iN BLACK PART ONLY Figure 11 Replacement of HDPE Guard Stainless Steel Guard The stainless steel guard provides lt 80um protection to the dew point sensor It is designed to show any contamination and the guard should be changed if the surface becomes discolored When replacing the guard care should be taken to handle the guard by the bottom part only A replacement guard SSG can be obtained by contacting Kahn Instruments www kahn com Bonded Seal If the installed bonded seal gets damaged or lost a pack of 5 replacement bonded seals can be obtained by contacting Kahn Instruments and quoting part number BS 58 PK5 Kahn Instruments 9 APPENDIX A Easidew Transmitter User s Manual Appendix A Technical Specifications E 10 Issue 9 1 December 2012 Easidew Transmitter User s Manual APPENDIX A Appendix A Technical Specifications Electrical Specification 4 20 mA 2 wire connection current source Output Signal User configurable over range Output Dew point or moisture content for ppm Dew point 148 to 68 F 100 to 20 C OR Analog Output Scaled Range Moisture content i
7. ity 0 99Fdp 0 59Cdp Dew point values traceable to international standards NIST Excellent sensor protection rugged 316 stainless steel NEMA 4 construction e Interchangeability Kahn Instruments 1 INSTALLATION Easidew Transmitter User s Manual INSTALLATION Unpacking the Instrument On delivery please check that all the following standard components are in the packing box Easidew Transmitter Bonded Seal Certificate of Calibration Connector for sensor cable Unpack the dew point transmitter box as follows Figure 1 Transmitter Unpacking Method 1 Remove the cap 1 from the packing tube 8 2 Remove the foam block 3 containing the connector 2 3 Pull out the transmitter 5 from the tube complete with the two foam covers 6 and 7 and the red protective cap 4 4 Remove the foam covers from the transmitter but leave the blue plastic protective cover 5 and the red cap 4 in place until ready for installation NOTE The transmitter sensing element is protected while in transit by a blue cover containing a small desiccant capsule The connection pins are protected by a red plastic cap These plastic items must be removed for the operation of the transmitter NOTE Keep the connector 2 in a safe place until the transmitter is ready for wiring Issue 9 1 December 2012 Easidew Transmitter User s Manual INSTALLATION 2 2 Preparation of the Sensor Cable The
8. n gas 0 3000 ppm Non standard available upon request Supply Voltage 12 to 28 V DC Max 2502 12 V Load Resistance 500 Q 24 V Current Consumption CE Marked Certified Operating Specifications Operating Temperature 40 to 140 F 40 to 60 C Operating Pressure 5000 psig max 2 to 10 scfh 1 to 5 NI min mounted in standard sampling Flow Rate block 0 to 33 fps 0 to 10 m sec direct insertion IP66 in accordance with standard BS EN60529 1992 Housing Material Transmitter plus connector 5 19 x 1 77 L 132mm x 45mm Standard HDPE Guard lt 10um Optional 316 stainless steel sintered guard lt 80um Process Connection amp Material 3 8 18 UNF 316 stainless steel Weight 5 290z 150g Interchangeability Fully interchangeable transmitter Electrical Connection Hirschmann GDS series DIN 4350 C Condition Diagnostic Conditions factory Sensor fault Dimensions Sensor Guard programmed Under range dew point Over range dew point aa ai RS485 2 wire Modbus RTU Communications Kahn Instruments 11 APPENDIX A Easidew Transmitter User s Manual Dimensions 5 8 Bonded Seal Sensor 132mm 5 197 25 4x 2mm 91 x 0 07 1 0 5 8 18 UNF lt gt 10mm 0 39 Figure 12 Dimensions Easidew 12 Issue 9 1 December 2012 Easidew Transmitter User s Manual APPENDIX B Appendix B UL Certification Listing Number E331965 Standards UL61010 1 2nd Edition
9. nstruments 7 OPERATION Easidew Transmitter User s Manual 3 OPERATION Operation is very simple assuming the following installation techniques are adhered to Sampling Hints Be Sure the Sample is Representative of the Gas Under Test The sample point should be as close to the critical measurement point as possible Also never sample from the bottom of a pipe as entrained liquids may be drawn into the sensing element V Figure 9 Installation Location Minimize Dead Space in Sample Lines Dead space causes moisture entrapment points increased system response times and measurement errors as a result of the trapped moisture being released into the passing sample gas and causing an increase in partial vapor pressure Deadspace Figure 10 Indication of Dead Space Remove Any Particulate Matter or Oil from the Gas Sample Particulate matter at high velocity can damage the sensing element and similarly at low velocity they may blind the sensing element and reduce its response speed If particulate such as degraded desiccant pipe scale or rust is present in the sample gas use an in line filter as a minimum level of protection For more demanding applications Kahn Instruments offers a range of sampling systems for more information contact www kahn com Use High Quality Sample Tube and Fittings Kahn Instruments recommends that wherever possible stainless steel tubing and fittings should be used This is particul
10. nsure that full ingress protection is achieved the retaining screw with the O ring and washer must be tightened to a minimum torque setting of 2 5 ft lbs 3 4 Nm The sensor cable used must be a minimum diameter of 0 2 4 6mm O ring N and washer Figure 4 Connector Installation 2 4 Electrical Schematic NOTE The screen shield should be connected for maximum performance and to avoid interference a i is i at Ci Supply 12V Min 28V Max Max Load 250R 12V 500R 24V Screen Shield Figure 5 2 Wire Connection Diagram 4 Issue 9 1 December 2012 Easidew Transmitter User s Manual INSTALLATION 2 4 1 2 5 Electrical Boundaries 600 500 400 TTT i LL LI i UL LI 12 14 16 18 20 22 24 26 2 Resistance ohms Supply Voltage Figure 6 Maximum Load of Easidew Including Cable Resistance Transmitter Mounting Prior to installation of the transmitter unscrew and remove the blue plastic cover and retain for future use Take care to prevent any contamination of the sensor before installation handle the transmitter by the main body only avoiding contact with the sensor guard The Easidew can be mounted into either a flow through sensor sampling block optional or directly inserted into a pipe or duct and can be operated at pressures of up to 5000 psig when installed with the bonded seal provided The recommended gas flow rate when mounted in the optional sampling bl
11. ock is 2 to 10 scfh 1 to 5 NI min However for direct insertion applications gas flow can be from static to 33 fps 10 m sec NOTE Place the bonded seal over the 5 8 18 UNF mounting thread and assemble into the sampling location by hand using the wrench flats only DO NOT grip and twist the sensor cover when installing the sensor When installed fully tighten using a wrench until the seal is fully compressed and to the following torque setting 5 8 18 UNF 22 5 ft lbs 30 5 Nm Kahn Instruments 5 INSTALLATION Easidew Transmitter User s Manual 2 5 1 Transmitter Mounting Sample Block Optional The following procedure must be carried out by a qualified installation technician To mount the transmitter into the sensor block preferred method proceed as follows refer to Figure 7 1 Insure that the protective cover 2 and its desiccant capsule 2a have been removed from the tip of the transmitter 2 Install the bonded seal 4 over the threaded part of the transmitter body WARNING Under no circumstances should the sensor guard be handled with the fingers 3 Screw the transmitter 1 into the sample block 3 and tighten to a minimum torque setting of 22 5 ft lbs 30 5 Nm NOTE Use the flats of the hexagonal nut and not the sensor body 4 Attach the transmitter cable connector assembly 6 to the plug located on the base of the transmitter and tighten the retaining screw 7 see Sec
12. s Manual Easidew Transmitter User s Manual Safety The manufacturer has designed this equipment to be safe when operated using the procedures detailed in this manual The user must not use this equipment for any other purpose than that stated Do not apply values greater than the maximum value stated This manual contains operating and safety instructions which must be followed to ensure the safe operation and to maintain the equipment in a safe condition The safety instructions are either warnings or cautions issued to protect the user and the equipment from injury or damage Use competent personnel using good engineering practice for all procedures in this manual Electrical Safety The instrument is designed to be completely safe when used with options and accessories supplied by the manufacturer for use with the instrument Pressure Safety DO NOT permit pressures greater than the safe working pressure to be applied to the instrument The specified safe working pressure is 5000 psig Refer to the Technical Specifications in Appendix A Kahn Instruments 3 Abbreviations Easidew Transmitter User s Manual The following abbreviations are used in this manual barg oC OF DC ft lbs in um m sec mA max mm MPa NI min Nm OZ ppm PSIG RH scfh scfs amp O lt A Warnings pressure unit 100 kP or 0 987 atm gauge degrees Celsius degrees Fahrenheit direct current foot pound force grams inch es
13. sensor cable is NOT supplied as standard A cable can be obtained by contacting Kahn Instruments see www kahn com for details Cable connection to the Easidew transmitter is made via the removable connector Removing the central screw enables the connector terminal block to be removed from the outer housing by using a small screwdriver to pry it clear and washer Figure 2 Connector Terminal Block Removal Caution When removing the central screw insure that the small sealing O ring and the washer are retained on the screw and are present during re installation For the transmitter to work properly and to achieve maximum performance the sensor cable must be connected to the sensor connector as shown in the drawing below Note The drawing below shows the identity of the connector terminals and wiring connections of the cable manufactured by Kahn Instruments GN GREEN 4 20 mA RED POWER O O H A BLUE SCREEN BRAID GREEN 4 20 mA 2 SOURCE yi SCREEN AS POSSIBLE POWER VIEW ON REAR OF CONNECTOR SCALE 2 1 Figure 3 Wiring Connections Always connect the 4 20 mA return signal to a suitable load see Figure 3 before the power is applied Without this connection the transmitter may be damaged if allowed to operate for prolonged periods Kahn Instruments 3 INSTALLATION Easidew Transmitter User s Manual 2 3 Cable Connection When installing the connector and to i
14. tion 2 3 Figure 7 Transmitter Mounting Sensor Block 6 Issue 9 1 December 2012 Easidew Transmitter User s Manual INSTALLATION 2 5 2 Transmitter Mounting Direct Pipeline Connection The transmitter may be directly mounted into a pipe or duct as shown in Figure 8 CAUTION Do not mount the transmitter too close to the bottom of a bend where any condensate in the pipeline might collect and saturate the probe The pipe or duct will require a thread to match the transmitter body thread Installation dimensions are shown in Figure 8 For circular pipework to insure the integrity of a gas tight seal a mounting flange will be required on the pipe in order to provide a flat surface to seal against The following procedure must be carried out by competent personnel 1 Insure that the blue protective cover and its desiccant capsule has been removed from the tip of the transmitter WARNING Under no circumstances should the sensor guard be handled with the fingers 2 Install a bonded seal 2 over the threaded part of the transmitter body 3 Screw the transmitter 3 into the pipe 1 Tighten enough to obtain a gas tight seal Torque will depend upon the pipeline material NOTE Do not overtighten or the thread on the pipe may be stripped Optional display 1 Bk available ed on request Optional cable available on request Figure 8 Transmitter Mounting Pipe or Duct Kahn I
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