User`s Manual
Contents
1. SENSOR 1 CHANNEL 1 TEMPERATURE DATE 2009 08 26 C 020m C 05V Min C 420m 010v Mea 10 Im TEMP 272 C ant RH 391 AbSHu 10 2 Cc LEE UNIT 8 RANGE TIME 16 42 01 CHANNEL 2 RELATIVE HUMIDITY OUT RANGE C 020m C 05V z C 420m 010V Mn Coy Max 100 4 CHANNEL 3 CALCULATED VALUE TYPE a C 020m amp C 05V fabs Hum x 420m4 C 040V C 04V SET TO VALUE Change the settings and press Set Fg Digital Filter Temperature 15 E s RelaiveHumidty amp Figure 8 1 Digital Filter Settings Screens Michell Instruments 21 97207 Issue 04 2 February 2011 280 and 290 Series Transmitters User s Manual 9 DIAGNOSTICS In the DIAGNOSTICS menu the user can see the series of selected events that the transmitter registered during its lifetime The menu can be accessed by clicking on the DIAGNOSTIC tab in the Digicor software screen NOTE This information is saved in the transmitter and therefore it is possible to access it from any PC in which the transmitter management software has been installed and the appropriate connection cable attached EJDIGICOR SOFTWARE Options View Hardware About Sone Re TE SETTINGS TEMP Calibration SENSOR 1 DATE 2009 08 25 TIME 16 41 01 TEMPERATURE UNDER LIMIT 462 TEMPERATURE OVER LMT OPEN HUMIDITY UNDER LIMIT HUMIDITY SA2. Fax 81 422 521700 E mail info michell japan co jp Web www michell japan co jp United Arab Emirates Tel 971 6 5575028 Fax 971 6 5575029 E mail me info michell com United Kingdom Michell Instruments Ltd 48 Lancaster Way Business Park North America Michell Instruments Inc 319 Newburyport Turnpike Suite 207 Ely CB6 3NW a MA 01969 Cambridgeshire England Tel 01 978 484 0005 Fax 01 978 843 7669 E mail us info michell com Web www michell com us Tel 44 1353 658000 Fax 44 1353 658199 E mail info michell com Web www michell com uk Michell Instruments 39 97207 Issue 04 2 February 2011 MICHELL Instruments http www michell com
3. especially so because vapor pressure appears twice in the formula for relative humidity e relative humidity in 96 e 100 e is the water vapor pressure and e is the saturation vapor pressure at the prevailing ambient temperature The following table illustrates the influence of a temperature variation of 1 C on the measurements of relative humidity at a constant pressure 10 HR 50 HR 2 3 90 HR 4 1 It is important to know that the variation will increase proportionately depending upon the difference between the temperature of the transmitter and that of the environment in which the relative humidity level is measured Good air circulation ensures correct operation of the transmitter as there will be a homogeneous distribution of water vapor in the environment NOTE In the case of saturation and therefore with the formation of condensation the sensor drying time will vary depending upon the conditions of ventilation in the environment NOTE If the transmitters are used in environments containing harmful chemical substances such as acids or solvents the sensor may undergo alteration of its metrologic characteristics such as its degree of sensitivity causing the degree of precision of the entire transmitter to be affected The sensors installed in the 290 series measure relative humidity and temperature Any optional output dew point frost point absolute humidity etc are derived values that are calcul
4. It is our commitment to reduce and eliminate from our operations wherever possible the use of substances which may be harmful to the environment Similarly we are increasingly using recyclable and or recycled material in our business and products wherever it is practical to do so The product that you have purchased may contain recyclable and or recycled parts and we will be happy to provide you with information on these components if required WEEE and RoHS Compliance This product is compliant with the RoHS Directive Michell is in full compliance with the WEEE Directive Registration No WEE JB0235YW Customers may be required to return certain instruments for treatment at the end of their working life June 2010 Calibration Facilities Michell Instruments calibration facilities are among the most sophisticated in the world and have been recognized for their excellence Traceability to the National Physical Laboratory NPL UK is achieved through our UKAS Accreditation Number 0179 This covers dew point over the range 90 to 90 C 130 to 194 F and also Relative Humidity Dew point calibrations are also traceable to the National Institute for Standards amp Technology NIST USA over the range 75 to 20 C 103 to 68 F NOTE Standard traceable calibration certificates for instruments and sensors are not issued under our UKAS accreditation UKAS certificates are usually to special order and are clearly identified Ma
5. been correctly connected it is possible to e Display the date time temperature and relative humidity e Configure the temperature and humidity outputs setting the signal type and corresponding scale range see Section 4 7 Configuration of Analog Outputs e Calibrate the relative humidity and temperature measurement channels see Sections 7 1 and 7 2 Calibration of Temperature and Humidity Channels e Access the diagnostics menu see Section 9 Diagnostics 4 5 1 Digital Communications The WM281 291 DT282 284 and WR283 285 293 are fitted with a digital communications system allowing an I O executive to be used to read measurements adjust thresholds reset alarms configure the instrument etc Physical Connection and Communications Protocol RS485 EIA standard differential signals with units connected in parallel by means of a two wire cable up to 32 units without a repeater Communications protocol Modbus J Bus in slave mode binary code RTU 8 bit characters with 1 start bit 1 stop bit and no parity Configurable baud rates 1 200 2 400 4 800 9 800 and 19 200 baud Each unit must be identified by means of a slave address from 1 to 247 Instruction codes 3or4 read n words 6 write 1 word 16 write n words maximum 8 consecutive words Any decimals contained in the data will not be transmitted Variable Parameter Addresses and Accessibility Using the Modbus protocol the addresses are the same as with
6. measurement the type of analog output and the corresponding scale range e For relative humidity channel 2 define the type of analog output and the corresponding scale range although it is normally 0 to 100 NOTE After having correctly set the two analog outputs it is necessary to press the SET TO VALUE button in order to transfer the settings to the transmitter T 97207 Issue 04 2 February 2011 16 Michell Instruments 280 and 290 Series Transmitters User s Manual 6 2 Address Configuration Speed Parity When entering into a network it is necessary to configure the address of the MODBUS slave before joining the device to the network By default the device is supplied with the address 1 Modification can be done in the menu Options and Communication Setting The COM port Baud rate parity Data bits and stop bits are set automatically according to the characteristics of the master used 6 3 Configuration of the Date and Time Date and time can be modified under Options then Time Setting Validate changes by clicking Set Michell Instruments 17 97207 Issue 04 2 February 2011 280 and 290 Series Transmitters User s Manual 7 CALIBRATION The transmitters are calibrated at the factory and therefore no further calibration is required following delivery However the transmitters can be re calibrated or aligned with reference samples for both the temperat
7. scale e High scale see datasheet for possible scale 5 Out value calculate e Out type 0 20mA 4 20mA 0 1V 0 5V 0 10V e Low scale e High scale see datasheet for possible scale 6 Serial e Code 1 address e Protocol MODBUS e Rate e Parity 7 Temperature Calibration e Set temperature e Restore factory settings NOTE Changes to some of these settings may lead to the loss of calibration data and should only be changed by qualified personnel when absolutely necessary 8 RH Calibration e Set RH e Restore factory settings NOTE Changes to some of these settings may lead to the loss of calibration data and should only be changed by qualified personnel when absolutely necessary a a Michell Instruments 13 97207 Issue 04 2 February 2011 280 and 290 Series Transmitters User s Manual 6 DIGICOR SOFTWARE 6 1 Installation 1 To install the Digicor software simply double click on the digicor msi icon 2 The following screen will appear Digicor wacone f Figure 6 1 Welcome screen 3 Click on Next and select the installation folder 97207 Issue 04 2 February 2011 14 Michell Instruments 280 and 290 Series Transmitters User s Manual Figure 6 2 Software Installation screen 4 Plug in the USB cable from the instrument to the computer This will install the USB drivers to the computer 5 Confirm the installation 6 Once installation of the Digi
8. 1 5 MICHELL Instruments WM281 291 DT282 284 WR283 285 293 Relative Humidity amp Temperature Transmitters User s Manual 97207 Issue 04 2 February 2011 Michell Instruments Inside front cover blank Instruments 280 and 290 Series Transmitters User s Manual MICHELL 2010 Michell Instruments This document is the property of Michell Instruments Ltd and may not be copied or otherwise reproduced communicated in any way to third parties nor stored in any Data Processing System without the express written authorization of Michell Instruments Ltd 97207 Issue 04 2 February 2011 iii Michell Instruments 280 and 290 Series Transmitters User s Manual Contents Safety ciccona aaa a aa aaa a a aaa vi Electrical Safety irissat A a a a vi Toxie Materials aaan a E E EN E AO vi R pair ANG MaintenanGE sssini usneseni rinnan aa LR EAR KR RM TER DAVE niaaa vi Calibrations a a a a E ERA vi Safety eee TIL ULL D LIMES vi AbbrevialiOn8 s ctexeis ceause ce a ar i debut na ee Eee vii ssec aaa viii WEEE and RoHS Compliatie 5 s ese iueseis abest nere deseo p eds ba su a Es oue eb ansdacsandaaccedtatvadeatanidsasnceausiae viii Calibration Facilities een viii Manufacturing Qualen ner Eden near viii luci ix Return POIG a a O E ix 1 INTRODUCTION sa ende 1 2 MEASUREMENT OF RELATIVE HUMIDITY 55x cuna apu uie c
9. 2 V 3 RS485 output Ground 4 Ground 5 N C 6 N C 7 Output Channel 2 RH 8 Output Channel 2 Ground 9 RS485 Data 10 RS485 Data 11 Not connected 12 Not connected 13 Output Channel 3 not connected 14 Output Channel 3 Ground not connected Do not connect pin 2 V to pin 4 Ground Michell Instruments 97207 Issue 04 2 February 2011 280 and 290 Series Transmitters User s Manual 4 2 Earth Connection A 9 conductor cable with a diameter between 5 and 9mm should be used for the power supply at the analog outputs and the serial interface The shielded cable must be accurately grounded to ensure electromagnetic compatibility NOTE Users are advised to install the cable carefully by passing it through the required cable gland in order to achieve the IP67 ingress rating 4 3 Power Connection The power supply at 24V 15 can be in an alternating or direct current In cases where more than one instrument is used a transformer should be installed for each individual unit The electrical design on the 280 and 290 series transmitters does not include galvanic isolation Therefore it is recommended that particular attention is paid to the final wiring configuration To avoid a short circuit between the input output and the power supply of instruments indicators controllers PLC etc to which one or more transmitters will be connected it is compulsory to use a dedicated isolated power supply for each transmitt
10. Look for Digicor LS serial Setting oo FEL Fanart Look for Wigicor 6 If communication is not achieved these steps should be repeated 97207 Issue 04 2 February 2011 28 Michell Instruments 280 and 290 Series Transmitters User s Manual 14 TECHNICAL SPECIFICATIONS Relative humidity Range of measurement Maximum error including non linearity and repeatability Temperatures Range of measurement Error in standard configuration of the scale 0 to 100 2 5 to 95 u r 3 lt 5 gt 95 30 to 200 C 22 to 392 F diversified according to the model 0 5 C f s NOTE These values are obtained respectively using as a reference a humidity generator equipped with a condensing mirror hygrometer and thermometric samples with high levels of measurement accuracy and are provided along with an adjustment and regulation certification produced under controlled environmental conditions metrological laboratory The level of accuracy indicated refers to full scale values Michell Instruments 29 97207 Issue 04 2 February 2011 280 and 290 Series Transmitters User s Manual 15 MAINTENANCE QUESTION Is the precision of the transmitter influenced by replacement of the interchangeable 17000 measurement device ANSWER No it is not Each interchangeable element is calibrated to have a standard signal of 0 1V for relative humidity which is linearized and compensated in
11. TURATION LAST SATURATION DATE Figure 9 1 Diagnostic screen The following information will be registered and displayed e If and how many times the temperature has reached the minimum and maximum limits limits set from the SETTINGS menu e If and how many times the humidity has reached the minimum limit and saturation point limit set from the SETTINGS menu e The date of the last saturation e Current date temperature and relative humidity 97207 Issue 04 2 February 2011 22 Michell Instruments 280 and 290 Series Transmitters User s Manual 10 INTERCHANGEABLE MODULE The transmitters are equipped with the interchangeable new generation HYGROSMART I7000 measurement module order code I17000 1 The plug in type connection allows for rapid low cost replacement operations and significantly reduces maintenance costs During manufacturing of the I7000 the humidity signal is compensated based on five RH points at 239C and 5 RH points at 609C calibration The labels of all 17000 models include e the serial number e the date of calibration This function is useful when errors are made in calibration and absolutely necessary when the HYGROSMART 17000 measurement module has to be replaced 10 1 Replacing the Interchangeable Module NOTE When replacing the I7000 module there is no need for further calibration NOTE It is possible to recover the factory calibrat
12. Transmitters User s Manual 3 Go to Ports COM amp LPT and check which port is created File Action View Help e Ee gum cma PARAOQ0440 9 Computer we Disk drives 2 Display adapters d DVD CD ROM drives E5 Human Interface Devices E IDE ATA ATAPI controllers Uu Keyboards 7 3 Mice and other pointing devices g Monitors Bg Network adapters I Ports COM amp LPT Ez Ez Ej E EH Ez E E E g X ECP Printer Port LPT1 I Intel R Active Management Technology SOL COM3 MM Processors Sound video and game controllers System devices Universal Serial Bus controllers 8 6 E6 C8 4 Goto the Digicor software and click on Options and click on Communication Setting Ley IGICOR SOFTWARE Options View Hardware About EP Calibration RH Calibration DIAGNOSTIC pn munication Setting SENSORN CHANNEL 1 TEMPERATURE DOCENT UNIT OUT TIME 18 30 36 ev C 020m C 05V f pie C 420m 010V TEMP 26 6 C C 01v z E GRS 3 9 g m3 CHANNEL 2 RELATIVE HUMIDITY OUT C 020m C 05V C 4 20 mA 010v C 01V CHANNEL 3 CALCULATED VALUE r TYPE OUT C 020m C 05V Jabs Hum I c 420m C 010v C 01V SET TO VALUE Michell Instruments 27 97207 Issue 04 2 February 2011 280 and 290 Series Transmitters User s Manual 5 Choose the correct port in Serial Settings and click on the button
13. ard Steel mesh filter KX series for use in environments which are clean not very dusty and where there is poor ventilation 2 Sintered steel filter HX series for use in dusty environments 3 Sintered steel filters with Teflon coating JX series for use in environments where there is a risk of saturation and or where aggressive chemical substances solvents and acids are present UUM 97207 Issue 04 2 February 2011 24 Michell Instruments 280 and 290 Series Transmitters User s Manual 12 DIGICOR CONFIGURATION KIT AND ACCESSORIES Digicor Configuration kit Order Code F035263 contains e DIGICOR software for programming via USB e Memory map of the device for management in an RS485 digital network e Communication cable The following accessories are available for the 280 and 290 series transmitters e Flange for the 19mm 0 75 sensor body in the DT282 model Order code FLA019 e Flange for the 012mm 0 47 sensor body in the DT284 model Order code FLA012 e Conversion module for the ADAM serial device from RS485 to RS232 Order code 330185 e Control Kit see Section 17 Use of the Control Kit with saturated saline solutions samples available at values of 25 35 50 and 80 e S904 Humidity calibrator for calibration purposes e S503 Humidity calibrator for calibration purposes pu J JP M a R Michell Instruments 25 97207 I
14. ated using the measured RH and temperature values Michell Instruments 3 97207 Issue 04 2 February 2011 280 and 290 Series Transmitters User s Manual 3 INSTALLATION 3 1 Choice of the Site of Installation The choice of the site of installation for the transmitter must be made bearing in mind the effectiveness of air circulation The point at which the sensor is installed must be typical of the surrounding environment where the measurements of relative humidity are to be taken The following should be avoided e Irregular sources of hot and cold air e All sources of IR radiation e Exposure to direct sunlight e The corners of a room or any areas where there is poor air circulation A suitable filter should be chosen depending on the application Care should be taken to keep the filter clean at all times The electronic circuits are installed in a strong housing unit in die cast aluminum which has an IP67 ingress rating The sensor bodies are made of stainless steel AISI 316 and or Victrex Peek or Delrin for the WM281 and WM291 3 2 Wall Mounting The versions designed for wall mounting WM281 and WM291 must always be installed with the measurement housing facing downwards so as to minimize the propagation of heat between the casing and the sensitive element Figure 3 1 WM291 I I 97207 Issue 04 2 February 2011 4 Michell Instruments 280 and 290 Series Transmitters User s Manual 3 3 Duct Mountin
15. brationsof the Humidity Chanel ee 19 7 3 Calibration of the Third Channels acre ee 19 7 4 Facts and Troubleshootihig acu iode ciet tips ea 20 8 DATA SIME cer UTEM 21 9 DIAGNOSTIC Siirsin REI 22 10 INTERCHANGEABLE MODULE wasvisiccsssseccatevenetencanabitcan uusesaPaadersainaencedecetnedes baie ised HEY anna ehe ae 23 10 1 Replacing the Interchangeable Module sismo keen nenne enden eR naar sauna Fa a GEEK REUS 23 11 gilt Y 24 97207 Issue 04 2 February 2011 iv Michell Instruments 280 and 290 Series Transmitters User s Manual 12 DIGICOR CONFIGURATION KIT AND ACCESSORIES tiicicosicssttdessstascasdtaesadcenonstedecaccadeagdenanatesease 25 13 PROBLEM SOLVING 2 ea 26 14 TECHNICAL SPECIFICATIONS ee 29 15 MAINTENANCE viiiccdscdiccatuartdetaceddocicoundetinatanciudansuddsacigatadedaccaduandeanwarudesatcescaadiabuatescdaadadeaanedaund 30 16 DOCUMENT OF CAEIBRATION aa ea na ana 31 17 USE OF CONTROL dy m 32 Figures Figure 3 1 WII 4 Figure 3 2 BU ia i lai Figure 3 3 WR29 P 5 Figure 3 4 WR29 r CR 6 Figure 4 1 POW ERC ORME CHOI M 8 Figure 4 2 RS232 Seal Inte tace Connection ana 9 Figure 6 1 Vires SER MT 14 Figure 6 2 DONWON INStOllaNOlE SOOO ne
16. chell Instruments 280 and 290 Series Transmitters User s Manual Appendix A List of Worldwide Michell Instruments Offices Asia Benelux Michell Asia Michell Instruments Benelux BV PO Box 3149 Krombraak 11 Joondalup 4906 CR Oosterhout WA 6027 The Netherlands Australia Tel 31 162 680 471 Tel 61 893 046587 Fax 31 162 437 566 E mail au info michell com E mail nl info michell com Web www michell com au Web www michell com nl China France Michell Instruments SAS 2 4 rue Jean Desparmet 69008 Lyon France Tel 33 437 53 88 20 Fax 33 437 53 88 21 E mail fr info michell com Web www michell com fr Michell Instruments Shanghai Ltd Room 505 Qilai Building 889 Yishan Road Shanghai 200233 PR China Tel 86 21 5401 2255 Fax 86 21 5401 2085 E mail cn info michell com Web www michell com cn Germany Austria Switzerland Italy Michell Instruments GmbH Michell Italia Srl Industriestrasse 27 Via Capecelatro 10 D 61381 Friedrichsdorf 20148 Milano Germany Italy Tel 49 6172 591700 Tel 39 02 4047194 Fax 49 6172 591799 Fax 39 02 40010565 E mail de info michell com E mail it info michell com Web www michell com de Web www michell com it Japan a Middle East Michell Japan KK wel Michell Instruments Middle East Musashino Center Building P 06 097 1 19 18 Nakacho Musashino hanah Ai Af Tokyo 180 0006 Sharjah Airport Int l free zone Sharjah Japan Tel 81 422 502600
17. cor software has been completed click on the Finish button The Digicor program is now ready to use m XOXX m i Michell Instruments 15 97207 Issue 04 2 February 2011 280 and 290 Series Transmitters User s Manual After correctly carrying out the installation procedure and starting the Digicor software the following screen MICHELL will appear Instruments I m looking for Digicor comm parameter please wait A progress bar will appear and the software will be installed onto your computer Bp IGICOR SOFTWARE Options View Hardware About pO Sd De ERTL OR ne Mh oo SETTING TEMP Calibrati RH Calibrati DIAGNOSTIC 3 T M sensor 1 CHANNEL 1 TEMPERATURE DATE 2009 08 25 UNIT OUT TIME 16 33 23 GC C 020m C 05V C 420m 0 10V 5 5 E 26 6 C C 04V z 8 48 9 12 3 2 CHANNEL 2 RELATIVE HUMIDITY r OUT C 0 20 mA C 05V C 420m 040v C 04V CHANNEL 3 CALCULATED VALUE TYPE OUT C 020m C 05V Jabs Hum e a20m C 010v C 04V Figure 6 3 Settings screen Within this menu it is possible to e Display the temperature and relative humidity currently detected by the transmitter e Display the current time and date e For temperatures channel 1 define the unit of
18. e 15 Figure 6 3 Settings STEEN niani a 16 Figure 7 1 TEMP Sci cus ds T a a a 18 Figure 7 2 RA Calibrauon 21 2 OTHER rm 19 Figure 8 1 Digital Filter Settings Screens M M 21 Figure 9 1 ph veu i ce ee 22 Figure 172 Useof Control Ki een 32 Foure 121 CONTON Keen 32 Appendices Appendix A List of Worldwide Michell Instruments Offices uzzu222220020000n0n0n0nnn nun nenne 35 Michell Instruments V 97207 Issue 04 2 February 2011 280 and 290 Series Transmitters 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 qualified personnel and 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 Toxic Materials The use of hazardous materials in the construction of this instrument has been minimized During normal operatio
19. er and all equipment on the same network PLC Acquisition System PLC Acquisition System a ePi e ebd e o zm 5 gt 5 Cp aE amp T28X 8 Channel 1 e 8E 8 T28X B Channel 1 o O o o eh O Volt e o ebk 0 Volt e ePK e gt ob x ps q aE E T28X Channel 2 E T28X 8 Channel 2 o o o ebk O Volt e ebkj 0 Volt e CORRECT INCORRECT Figure 4 1 Power Connection Lu EOU 97207 Issue 04 2 February 2011 8 Michell Instruments 280 and 290 Series Transmitters User s Manual 4 4 RS232 Serial Interface The transmitters are equipped with digital serial communication ports which allow for easy management of the instrument when it is installed Connection is carried out directly on the card inside the connection housing by means of the communication cable and the corresponding management software Both of these are available as accessories in the Digicor configuration kit Order code F035263 see Section 12 Accessories Connector for the PC Connection Cable mE e no on rao Os oo in zo oz Figure 4 2 RS232 Serial interface connection After the components have been correctly connected it is possible to e Display the date time temperature and relative humidity e Configure the temperature and humidit
20. following procedure must be completed 1 Notify a Michell Instruments distributor giving full details of the problem the model variant and the serial number of the product 2 Ifthe nature of the problem indicates the need for factory service then the instrument should be returned to Michell Instruments carriage prepaid preferably in the original packaging with a full description of the fault and the customer contact information 3 Upon receipt Michell Instruments will evaluate the product to determine the cause of the malfunction Then one of the following courses of action will be taken e If the fault is covered under the terms of the warranty the instrument will be repaired at no cost to the owner and returned e If Michell Instruments determines that the fault is not covered under the terms of the warranty or if the warranty has expired an estimate for the cost of the repairs at standard rates will be provided Upon receipt of the owner s approval to proceed the product will be repaired and returned Michell Instruments ix 97207 Issue 04 2 February 2011 280 and 290 Series Transmitters User s Manual 1 INTRODUCTION The 280 and 290 series transmitters are microprocessor based instruments used to measure relative humidity and air temperature These products are available in five different models e WM281 and WM291 for wall mounting with a working range of 30 to 70 C 22 to 158 F e DT282 for duct t
21. g DT282 and DT284 The versions for duct mounting DT282 and DT284 must be installed so that the end of the sensor body the filter comes into contact perpendicularly with the flow of air from which the relative humidity is to be measured An extra opening should be made in the air duct close to the opening for the installation of the sensor in order that checks and further calibration may be performed when required Whenever necessary it is very important to create an appropriate form of thermal insulation between the walls of the duct and the transmitter housing Figure 3 2 DT282 3 4 Remote Mounting The versions for remote mounting WR283 and WR293 must be installed following the same instructions for duct type installation This model allows the user to satisfy particular requirements in applications where it is necessary to provide a distance between the electronic components of the sensor housing for reasons relating to dimensions and or high temperatures Figure 3 3 WR293 Michell Instruments 5 97207 Issue 04 2 February 2011 280 and 290 Series Transmitters User s Manual 3 5 Mounting in a Pressurized Environment Installation of a sensor for pressurized environments WR285 requires the user to adopt important precautions to ensure correct operation and maintenance of the sensor e A frame i e a flow dampening device should be placed between the sensor and the duct to avoid damage to the sensor tha
22. in Ha dvnscenlanenenevedesnevatensnegeaavedeatanese 3 3 INSTALLATION Sasse ee satan Raga baka ceca FX URS Fett Kus Aa E ET cu aao 4 3 1 Choice of the Site of Installation era 4 3 2 Wall MOURINO AAFERERPEGPPEPEPEFFERFPEPFCHFERTREETEREFELTELFEEFFREPFPPEBRTFRTEFERTPRRECRFELETETERRITEPLPEERFEERTEFETTEERT 4 3 3 Duct Mounting DT282 and DT284 iioi pei teh en ena en ohh n papa aun n Re pg uk a cen nna enn 5 3 4 Remote MOUMENING EE mE 5 3 5 Mounting in Pressurized Environment uses inue cune tta dona npud nde ug tux x RE Fa nuni cen inu du eR 6 4 G10 2G 0 cce TT 7 4 1 Electrical Connecti Mergane era EEE E EEEE 7 4 2 Earth a n nl 7e10 0 pee MEHR 8 4 3 Power Connections an 8 4 4 RS232 Serial Interface vi re a a O o Rau e nene E Reve Eh eerie 9 4 5 RS485 Serial NteifaCessccsetetesntocesanead eoa ea a a En rennen 10 4 5 1 Digital CommuhiCatiORs PRRRPERBPFFURPERFEEFEUEFEFFLTNTENEUPRBEPLERETFEVEFEFETEFTETLTETETELETSEFEPTPRTEFEFFRFETETT 10 4 6 Standard Settings ae 11 4 7 Configuration of Analog OUtDUES 225 cca ca aci ran duo a Ru kann Roa a E 11 5 DIGITAL DISPLAY AND OPERATION KEYS 12 6 DIGICOR SOFTWARE P 14 6 1 Mn avs HIS ERE EE DELL LLL A AE 14 6 2 Address Configuration Speed Parity eie ome rna rtu a han ai 17 6 3 Configuirationcor the Date and TII d ceecuakceciks anne ee ann FARE Fer ene 17 7 CALIBRATION EI 18 7 1 Calibration of the Temperature Channel 52 uncia ee 18 7 2 Cali
23. ion by pressing the RESTORE FACTORY CALIBRATION key The following steps should be taken to carry out the replacement of the 17000 module 1 Switch off the power supply to the transmitter 2 Unscrew the protection filter mounted on the measurement sensor body 3 Very carefully remove the 17000 to be replaced and insert the new component remembering to apply the appropriate adhesive label with the date of calibration to the transmitter body 4 Re mount the protection filter Michell Instruments delivers each interchangeable module with an identification label which must be attached to the transmitter housing over the previous label If a transmitter is returned to the factory for repair or maintenance without the appropriate label of the corresponding interchangeable module the warranty shall be considered as invalid Michell Instruments 23 97207 Issue 04 2 February 2011 280 and 290 Series Transmitters User s Manual 11 FILTERS The filter is a fundamental element for a relative humidity transmitter as it ensures excellent protection against dust pollution and high speed air flow and a good level of resistance against chemical agents which are harmful for the sensor The filter allows the sensor to breathe the humidity contained in the environment to be measured and it is therefore very important to keep it clean The 280 and 290 series transmitters can be equipped with the following filter models 1 Stand
24. mitter is connected to an RS485 network but the user intends to use the RS232 serial port e g for temperature and RH signal calibration it is necessary to temporarily disconnect the leads to connectors 3 9 and 10 see Section 4 1 for details Michell Instruments 11 97207 Issue 04 2 February 2011 280 and 290 Series Transmitters User s Manual 5 DIGITAL DISPLAY AND OPERATION KEYS The 290 series transmitter can be configured locally using 8 sub menus Press F Function key and press the A up key once to open the menu and reach all levels I To validate the parameters highlight the line To edit press the O key then choose the value by pressing the A up and wv down keys and confirm by pressing the O key 1 Information e Model type e Expiration date e Serial number e Password Enter 99 by pressing the A up and wv down keys NOTE This is required to reach all 8 levels of configuration 2 Configuration e LCD contrast e LCD back light e Filter temperature from 0 20s For more information refer to Section 8 e Filter humidity from 0 20s For more information refer to Section 8 e Temperature unit 3 Out temperature e Out type 0 20mA 4 20mA 0 1V 0 5V 0 10V e Low scale e High scale see datasheet for possible scale 97207 Issue 04 2 February 2011 12 Michell Instruments 280 and 290 Series Transmitters User s Manual 4 Out RH e Out type 0 20mA 4 20mA 0 1V 0 5V 0 10V e Low
25. n it is not possible for the user to come into contact with any hazardous substance which might be employed in the construction of the instrument Care should however be exercised during maintenance and the disposal of certain parts Repair and Maintenance The instrument must be maintained either by the manufacturer or an accredited service agent Refer to Appendix A for details of Michell Instruments worldwide offices contact information Calibration Refer to details in Section 7 regarding recalibration of transmitters in order to adjust their calibration in accordance with reference samples or an external reference device Safety Conformity This product meets the essential protection requirements of the relevant EU directives Further details of applied standards may be found in the product specification 97207 Issue 04 2 February 2011 vi Michell Instruments 280 and 290 Series Transmitters User s Manual Abbreviations The following abbreviations are used in this Manual A Ampere mA milliampere ms milliseconds C degrees Celsius F degrees Fahrenheit V Volt RH relative humidity T Temperature Dp Dew point Fp Frost point Abs hum absolute humidity g m grams per cubic meter a GV ZZ VW Michell Instruments vii 97207 Issue 04 2 February 2011 280 and 290 Series Transmitters User s Manual r ge Recycling Policy Ga 2 Michell Instruments is concerned with the protection of the environment
26. ndividual transmitter Michell Instruments 31 97207 Issue 04 2 February 2011 280 and 290 Series Transmitters User s Manual 17 USE OF CONTROL KIT The Control Kit contains e 5 phials of diluted saline solution 25 35 50 or 80 RH e 7 pads of absorbent paper e Instruction sheet e Teflon calibration cell chamber 12 19 or 22mm INSTRUCTIONS FOR USE be Figure 1 i Figure 3 i Figure 17 1 Control Kit Remove the collar A of the calibration cell C see Figure 1 Clean the collar and the cell to eliminate any traces of dust or liquid Take a pad of absorbent paper and form it into a cylindrical shape B corresponding with the internal diameter of the collar A and position it inside the collar Take a phial containing the saline solution holding the narrow part upwards and shake it in order to transfer all of the solution to the lower part Open the phial and pour its contents onto the pad located inside the collar see Figure 2 Wait for about 20 seconds until the liquid is completely absorbed Turn the cover upside down to eliminate any excess solution Remove the protective cover or the filter from the instrument to be calibrated Ensure there is no contact with the active sensor polymer Carefully insert the end of the sensor D to be checked inside the cell C and screw in Be very careful when inserting the active sensor polymer to ensure that it does not
27. nufacturing Quality Michell Instruments is registered with the British Standards Institute for Quality Assurance to BS EN ISO 9001 2008 Rigorous procedures are performed at every stage of production to ensure that the materials of construction manufacturing calibration and final test procedures meet the requirements laid down by our BSI approved Quality System Please contact Michell Instruments if the product does not arrive in perfect working order 97207 Issue 04 2 February 2011 viii Michell Instruments 280 and 290 Series Transmitters User s Manual Warranty Unless otherwise agreed the Supplier warrants that as from the date of delivery for a period of 12 months the goods and all their component parts where applicable are free from any defects in design workmanship construction or materials The Supplier warrants that the services undertaken shall be performed using reasonable skill and care and of a quality conforming to generally accepted industry standards and practices Except as expressly stated all warranties whether express or implied by operation of law or otherwise are hereby excluded in relation to the goods and services to be provided by the Supplier All warranty services are provided on a return to base basis Any transportation costs for the return of a warranty claim shall reside with the Customer Return Policy If a Michell Instruments product malfunctions within the warranty period the
28. ontained in the sample of gas The unit of measure is 1g of water kilogram of dry air g Kg Specific enthalpy heat content The heat required to bring 1Kg of dry air and the vapor contained in it to a constant pressure from the state of 0 C air liquid water to the state of a gaseous mixture at temperature t 97207 Issue 04 2 February 2011 2 Michell Instruments 280 and 290 Series Transmitters User s Manual 2 MEASUREMENT OF RELATIVE HUMIDITY Measurement of relative humidity is a complex measurement of the thermodynamic type It is closely linked to temperature levels Relative humidity The ratio of the actual vapor pressure to the saturation vapor pressure over a plane liquid water surface at the same temperature expressed as a percentage This is commonly understood when the term X percent relative humidity is used The phrase relative humidity is commonly abbreviated RH although this is not a recognized abbreviation Values of relative humidity are commonly expressed in units of percent relative humidity 9o RH Care must be taken when expressing uncertainties changes or fractional differences in relative humidity For example the difference between 50 RH and 52 RH is 2 RH This can also be expressed as a difference of 4 of value It is important to distinguish clearly between these two kinds of statement Temperature and relative humidity Relative humidity is highly dependent on temperature
29. plications If the transmitter is being used in a clean environment e g in a measurement laboratory calibration should be checked about once every two years 97207 Issue 04 2 February 2011 18 Michell Instruments 280 and 290 Series Transmitters User s Manual 7 2 Calibration of the Humidity Channel EZDIGICOR SOFTWARE Options View Hardware About OR IB mom Os memo SETTINGS ewe Calibration RH Calibration SENSOR 1 ONE POINT DATE 2009 08 25 TIME 16 39 29 TEST VALUE 50 o r TWO POINT TEsTvatuE 1 20 fo sen E Test vatue2 80 Jo ser FACTORY CALIBRATION RESTORE FACTORY CALIBRATION MAP vam SS Sat on A ar ET ae Pan MAT eR AIEO Nae ass NT A MR T feet See TR ER Figure 7 2 RH Calibration screen Calibration is the process of comparing a measuring instrument against an authoritative reference for the same type of measurement to identify any bias or systematic error in the readings The outcome of a calibration is normally a correction value that needs to be applied to the values indicated by the instrument together with an estimate of the uncertainty in calibration and other relevant information For normal applications Michell recommends calibrating the instrument once a year For applications where the user expects pollutants to be present in the measured atmosphere or when the process integrity has to be very high more frequent calibration intervals are
30. recommended One point calibration is normally performed at the working temperature and humidity of the transmitter for comparison with a reference sample instrument see Section 12 Accessories For two point calibrations it is necessary to generate two points of relative humidity at constant temperature separated from each other by at least 50 In such cases two samples of saturated saline solution are normally used 25 and 80 RH see Section 12 Accessories 7 3 Calibration of the Third Channel Asthe physical values transferred to this analog output are derived from the direct measurement of temperature and relative humidity no form of calibration is required In both cases the transmitter and the samples must remain in the same environment for at least 4 hours so as to reach thermal equilibrium the fundamental condition which is required to be able to make a reliable metrological comparison and consequently achieve an optimum degree of calibration Michell Instruments 19 97207 Issue 04 2 February 2011 280 and 290 Series Transmitters User s Manual 7 4 Facts and Troubleshooting For correct operation make sure the transmitter operates in accordance with the specifications indicated on the technical data sheets If the transmitter needs to be recalibrated read Section 7 Calibration The reference sample instrument used for calibration must be certified in the appropriate manner by an accredi
31. ssue 04 2 February 2011 280 and 290 Series Transmitters User s Manual 13 PROBLEM SOLVING The Digicor software communicates via single USB connection and creates a serial port on the computer These ports are designated as COM ports If a successful communication link has not been made then make sure the correct port has been created Check in Windows Device Manager to see what ports are available on the computer 1 Right click on My Computer and choose Properties Open CZ Find And Replace Explore Search Manage Scan with Sophos Anti Virus Map Network Drive Disconnect Network Drive Create Shortcut Delete Rename Properties 2 Go to the tab Hardware and click on Device Manager System Properties d X System Restore Automatic Updates Remote General Computer Name Hardware Advanced Device Manager The Device Manager lists all the hardware devices installed e on your computer Use the Device Manager to change the properties of any device Drivers a Driver Signing lets you make sure that installed drivers are mj compatible with Windows Windows Update lets you set up how Windows connects to Windows Update for drivers Hardware Profiles E Hardware profiles provide a way for you to set up and store different hardware configurations Hardware Profiles 97207 Issue 04 2 February 2011 26 Michell Instruments 280 and 290 Series
32. t could be caused by air speeds higher than 20m sec e The sensor should be mounted at a perpendicular angle to the flow of air e When installed in pneumatic systems a suitable oil filter should be used e The system should be returned to environment pressure before dismantling and removing the sensor Figure 3 4 WR285 n MM E ssl 97207 Issue 04 2 February 2011 6 Michell Instruments 280 and 290 Series Transmitters User s Manual 4 CONNECTIONS 4 1 Electrical Connection Applicable for the following products WM291 WR293 Pin V V RS485 output Ground Ground Output Channel 1 Temperature Output Channel 1 Ground Output Channel 2 RH Output Channel 2 Ground RS485 Data RS485 Data Not connected Oo AN DH d UNB ee e N e Oo Not connected m w Output Channel 3 optional m A Output Channel 3 Ground optional Applicable for the following products WM281 DT282 DT284 WR283 Pin 1 V 2 V 3 RS485 output Ground 4 Ground 5 Output Channel 1 Temperature 6 Output Channel 1 Ground 7 Output Channel 2 RH 8 Output Channel 2 Ground 9 RS485 Data 10 RS485 Data 11 Not connected 12 Not connected 13 Output Channel 3 not connected 14 Output Channel 3 Ground not connected Do not connect pin 2 V to pin 4 Ground Do not connect pin 2 V to pin 4 Ground Applicable for the following products WR285 Pin 1 V
33. ted Calibration Centre so as to reach an optimum level of precision see Section 12 Accessories The measurement principle of the reference sample must be the same as that of the transmitter i e capacitive type so as to minimize the risk of error To ensure the same conditions of comparison it is necessary that e the measurement housings of the two instruments be located as close together as possible e the readings be obtained simultaneously e the operator does not hold in his her hands either of the measurement housings body heat is approximately 36 5 C As already specified calibration can also be carried out using samples of saturated saline solutions see Section 12 Accessories or a humidity generator such as the S904 or S503 NOTE Wherever possible it is advisable to carry out calibration in a clean controlled environment 97207 Issue 04 2 February 2011 20 Michell Instruments 280 and 290 Series Transmitters User s Manual 8 DATA FILTERING In some applications it might be useful to obtain an averaged signal calculated from a number of samples In the 280 and 290 series both the RH and T output value can be adjusted using digital data filters The sample rate is 50 milliseconds To change the settings go to Hardware and choose Digital Filter EJDIGICOR SOFTWARE Options View Hardware About LS Parameters UO ai M pet n As Rm OA sk moms rein AH Calibration DIAGNOSTIC
34. terms of temperature The filter is an important element for the correct operation of a transmitter of relative humidity QUESTION When does the filter need to be cleaned ANSWER If the filter were to be obstructed on account of a high concentration of dust the sensor would not breathe and then there would be no available reading of relative humidity in the surrounding atmosphere It is therefore necessary to clean the filter on a periodical basis with a jet of air from the inside outwards If necessary it can be rinsed with clean distilled water and then dried QUESTION What needs to be done if the sensor becomes saturated ANSWER It may happen that the transmitter becomes saturated i e with an indication of 100 relative humidity following a sharp fall in temperature In such cases condensation has formed on the primary sensor In order to restore correct operation of the transmitter simply remove the cover and interchangeable element 17000 let them dry and then re install them QUESTION Does condensation damage or destroy the sensor ANSWER No It is however necessary to avoid touching it with fingers or any other object e g with cotton pads or cloth 97207 Issue 04 2 February 2011 30 Michell Instruments 280 and 290 Series Transmitters User s Manual 16 DOCUMENT OF CALIBRATION The 280 and 290 series transmitters are delivered with a Certificate of Conformity and a calibration report for each i
35. the J BUS 1 protocol The addresses not mentioned are reserved by the system Memory map is available on request 97207 Issue 04 2 February 2011 10 Michell Instruments 280 and 290 Series Transmitters User s Manual 4 6 Standard Settings Please see below the default settings of the analog outputs Relative humidity e For all models the output signal is equal to the range 0 100 RH Temperature e For models WM281 DT282 and WM291 the output signal is equal to the range 30 to 70 C 22 to 158 F unless another output scale is ordered e For models WR283 and WR293 the output signal is equal to the range 30 to 200 C 22 to 392 F unless another output scale is ordered e For model DT284 the output signal is equal to the range 30 to 140 C 22 to 284 F unless another output scale is ordered Third analog output e For all dew point models the signal is equal to the range 40 to 100 C 40 to 212 F 4 7 Configuration of Analog Outputs To configure the three analog outputs it is necessary to 1 Create the serial connection through the RS232 or RS485 port between the transmitter and the PC 2 Power up the transmitter see Section 4 3 Power Connection 3 Install the appropriate programming software in the PC available on CD in the Digicor configuration kit see Section 12 Accessories NOTE The transmitter cannot simultaneously communicate with two digital outputs If the trans
36. the Pt100 Q fine film sensor in the range of 40 to 200 C 40 to 392 F The models of the 290 series are equipped with an LCD mounted in the cover of the housing making it possible to display the temperature relative humidity and a physical value set at the third analog output The third analog output is configurable by the user and displays one of the following calculated values Dew point The temperature at which a mixture of gas and water vapor must be cooled at constant pressure for condensation to begin to form in the liquid phase i e the temperature at which a gas becomes saturated in equilibrium on a flat surface of water The unit of measure is degrees Celsius C or can be set to degrees Fahrenheit F Frost point The temperature at which a mixture of gas and water vapor must be cooled at constant pressure so that condensation begins in the solid phase i e the temperature at which a gas becomes saturated in equilibrium on a flat surface of ice The unit of measure is degrees Celsius C or can be set to degrees Fahrenheit F Michell Instruments 1 97207 Issue 04 2 February 2011 280 and 290 Series Transmitters User s Manual Absolute humidity The mass of vapor present in the unit of volume of humid gas at defined temperature and pressure levels The unit of measure is 1g of water cubic meter g m Mixing ratio or title The ratio between the mass of water vapor and the mass of dry gas c
37. touch the side of the cell C Screw the collar A containing the pad onto the cell C see Figure 3 The position of the sensor cell assembly horizontal or vertical is optional Wait for 15 minutes for stabilization 30 minutes for the solution at 80 RH before performing a check Carefully remove the sensor D from the cell C Be very careful when removing the active sensor polymer to ensure that it does not touch the side of the cell C After use remove the collar discard the pad and use an absorbent cloth to clean the cell before using again Figure 17 2 Use of Control Kit 97207 Issue 04 2 February 2011 32 Michell Instruments 280 and 290 Series Transmitters User s Manual Conditions of use Temperature of the reference environment 23 C 1 C Environment humidity stable at 1 to 10 Range of measurement e temperature from 0 to 50 C with required corrections e humidity from 10 to 90 RH Storage of the solution In the phials Indefinite Once the phial has been opened 2 hours NOTE The instruments to be calibrated and the solutions kit must be stored in the same environment during the hour preceding their use Do not hold the calibration cell in the hands during use Michell Instruments 33 97207 Issue 04 2 February 2011 280 and 290 Series Transmitters User s Manual Appendix A List of Worldwide Michell Instruments Offices E 97207 Issue 04 2 February 2011 34 Mi
38. ure and humidity functions with the TEMP Calibration and RH Calibration menus respectively It is necessary to establish a connection with a PC in accordance with the procedures given in the previous section Calibration can be carried out 1 ata point of measurement i e a linear connection across the whole measurement scale offset correction OR 2 attwo points of measurement a more accurate adjustment as it also corrects the slope of the typical output curve i e a straight line on account of the fact that they are linear outputs After setting the reference values TEST VALUE the SET button must be pressed to transfer the calibration data to the transmitter NOTE It is possible to recover the factory calibration by simply pressing the RESTORE FACTORY CALIBRATION key This function is useful when errors are made in calibration and absolutely necessary when the HYGROSMART 17000 measurement module has to be replaced see Section 10 Interchangeable Module 7 1 Calibration of the Temperature Channel EQDIGICOR SOFTWARE r ONE POINT DATE 2009 08 25 TIME 16 36 51 Testva e 25 fo Sl TEMP 267 c aes Jd RH 478 AbSHu 121 r TWO POINT TEST VALUE 1 10 o sen ae TEST VALUE 2 60 Jo sen FACTORY CALIBRATION RESTORE FACTORY CALIBRATION Figure 7 1 TEMP Calibration screen The Pt100 temperature sensor model does not require frequent calibration in most ap
39. y outputs setting the signal type and corresponding temperature range see Section 4 7 Configuration of Analog Outputs e Calibrate the relative humidity and temperature measurement channels see Sections 7 1 and 7 2 Calibration of Temperature and Humidity Channels e Access the diagnostics menu see Section 9 Diagnostics NOTE The transmitter cannot simultaneously communicate with two digital outputs If the transmitter is connected to an RS485 network but the user intends to use the RS232 serial port e g for temperature and RH signal calibration it is necessary to temporarily disconnect the leads to connectors 3 9 and 10 see Section 4 1 for details pm X XXX we X amp eee Michell Instruments 9 97207 Issue 04 2 February 2011 280 and 290 Series Transmitters User s Manual 4 5 RS485 Serial Interface The transmitters are equipped with an RS485 serial port using the MODBUS protocol which allows for insertion of a digital communication network as a slave element With the ADAM conversion module see Section 12 Accessories a network management program and a memory map available on a CD in the Digicor configuration kit see Section 12 Accessories it is possible to manage up to 32 units from a PC slave covering a maximum distance of 1 2 Km under optimum conditions After the components have
40. ype mounting sensor body A 19mm 0 75 with a working range of 30 to 70 C 22 to 158 F e WR283 and WR293 for remote mounting with a working range of 30 to 200 C 22 to 392 F e DT284 for duct type mounting sensor body A 12mm 0 47 with a working range of 30 to 140 C 22 to 284 F e WR285 for pressurized environments to a maximum of 30 bar The 280 transmitters have two analog outputs for temperature and relative humidity respectively which allow for connection to any type of instrumentation with standard linear inputs 4 20mA 0 20mA 0 10V 0 1V and 0 5V The transmitters are equipped with the interchangeable new generation HYGROSMART technology The HYGROSMART technology is equipped with an advanced ASIC which allows for linearization and compensation in terms of temperature of the relative humidity signal The transmitters can be recalibrated in terms of both temperature and humidity measurement and can therefore always be in line with the reference samples and also in extreme applications for the polymer sensor Measurement is done by means of a polymer sensor with a fine capacitive film The principle of this operation is based on the variation of the characteristics of the dielectric and thus of the value of the capacitance in proportion to the quantity of water vapor molecules contained in the environment in the range 0 to 10096 RH The measurement of the temperature is achieved by means of
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