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OPERATING MANUAL _______________________________________________________________

72_____________________________________________________________________M210492

CHAPTER 8

TECHNICAL DATA

Measured variables

Dewpoint temperature

Measurement range

-60...+80 °C

(below 0 °C DMP248 outputs frostpoint)

Dewpoint accuracy

± 2 °C (-50...+80

(see figure below)

IGURE

8-1

Measurement range and accuracy.

Response time (90%) at flow rate 0.08 m/s
(1 bar) at 20 °C:
-40

→

-20 °C dp

35 s

-20

→

-40 °C dp

240 s

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Summary of Contents for DMP248

Page 1: ...DMP248 Dewpoint Transmitter OPERATING MANUAL M210492EN A JULY 2003 All manuals and user guides at all guides com a l l g u i d e s c o m...

Page 2: ...a com Vaisala 2003 No part of this manual may be reproduced in any form or by any means electronic or mechanical including photocopying nor may its contents be communicated to a third party without pr...

Page 3: ...HAPTER 4 COMMISSIONING 25 SECURITY LOCK JUMPER 25 SELECTING THE ANALOGUE OUTPUTS 26 CONNECTING THE RS 232C SERIAL BUS 28 CHAPTER 5 COMMANDS 33 COMMANDS AND SECURITY LOCK JUMPERS 33 LED COMMANDS 34 DIS...

Page 4: ...TER 8 TECHNICAL DATA 72 MEASURED VARIABLES 72 OUTPUTS 73 GENERAL 74 ELECTRONICS 75 SERIAL INTERFACE MODULES 75 ELECTROMAGNETIC COMPATIBILITY 76 CHAPTER 9 OPTIONS 76 CHAPTER 10 SPARE PARTS AND ACCESSOR...

Page 5: ...ry to or death of personnel CAUTION Caution denotes a hazard It calls attention to a procedure practice condition or the like which if not correctly performed or adhered to could result in damage to o...

Page 6: ...All manuals and user guides at all guides com a l l g u i d e s c o m...

Page 7: ...ed to a serial bus via the RS 232C interface or optionally through an RS 485 422 serial module or a current loop module The transmitter can be configured in many ways It can have either a blank cover...

Page 8: ...midity levels approach zero the accuracy rapidly decreases and the offset soon becomes the largest source of errors when monitoring frostpoints Therefore the focus is to minimize the offset error at 0...

Page 9: ...n is nominal 100 As the temperature increases the RH drops Since the response is linear a straight line is fitted through the data points The line intercepts the y axis at RH0 as shown in FIGURE 2 1 N...

Page 10: ...tting is used for pressure compensation of the DMP248 transmitter Note that although dewpoint is a pressure dependent parameter this setting cannot be used for calculating dewpoints in different press...

Page 11: ...for installation or removal of the probe Install the sensor head transversely against the direction of the process flow If the probe head has to be installed aside of the process gas flow or the proc...

Page 12: ...sure IP65 NEMA4 rating 2 Make sure that the connection cable has the right thickness 7 10 mm and that the cable bushing is carefully tightened 3 Pay always special attention to closing the transmitter...

Page 13: ...ng the clasp nut of the probe parallel thread G1 2 ISO 228 1 BS 2779 JIS B0202 40mm Process or pipe wall FIGURE 3 3 Sealing and thread cutting for the fitting body The fitting body can be installed e...

Page 14: ...to the process Select a point which gives a true picture of the process The transmitter can be installed directly in the process wall especially if the pressure of the process is 1 bar atmospheric pro...

Page 15: ...ce cap the hole with a capped nut this way the process can be open although the probe is not in place FIGURE 3 6 Installing the sensor head directly on the process pipe Installing the probe through th...

Page 16: ...sembly provided that the process pressure is less than 10 bars This way the process does not have to be shut down when installing or removing the probe However if the process is shut down before remov...

Page 17: ...nut manually fitting body R1 2 cone sealed bushing R1 2 cone sealed bushing R1 2 cone G1 2 40 bar e g Camozzi 2520 1 2 1 2 ball valve 1 2 40 bar e g Atlas Copco BAL 1A 15 G1 2 nipple R1 2 cone sealed...

Page 18: ...sembly R1 2 ISO 7 1 120mm 5 5 61 40 148 mm manual press tool probe pipe fitting ferrule marking groove leak screw B hex 1 5 mm 14 29 15 13 5 DRYCAP sensor filter fitting body hex 24 mm handle adjustme...

Page 19: ...Installing the probe through the ball valve assembly step 3 For by pass measurements the probe is mounted behind the ball valve assembly and non leaking screw A on the fitting body is replaced with l...

Page 20: ...e or chamber O ring FIGURE 3 11 Installing the sensor head for by pass measurements When pushing the probe head through the ball valve assembly be careful not to break the sintered filter Open and clo...

Page 21: ...s easily removed when necessary It is necessary for the probe to be installed in the leak through position for a reasonable response time FIGURE 3 12 illustrates an example of using a quick connect wi...

Page 22: ...ambient temperature must be at least 10 C warmer than the process dewpoint in order to avoid condensation in the sample tubing SAMPLE CELL CLASP NUT DMP248SC THIS EDGE INTER AGAINST PUSH PROBE TIGHTEN...

Page 23: ...ith the help of a metal plate An overpressure in the process is necessary to create a flow through the sample cell Note that the pressure of the sample cell must not differ from that of the process be...

Page 24: ...mm of the cable insulation but leave 25 mm of the braid visible slip the nut and rubber ring over the cable insulation slip the brass disk that has the bigger hole in it over the braid so that it res...

Page 25: ...s of the sensor head the screen of its cable the transmitter housing and the screen of the signal cable to external system are all connected to each other After this the whole system can be grounded f...

Page 26: ...RRENT VOLTAGE OUTPUTS POWER SUPPLY INTERNAL OR EXTERNAL Do not use power supply ground as output signal ground OPENED COVER OF THE DMP248 FIGURE 3 17 Electrical connections Power supply 24 VDC 24 VAC...

Page 27: ...use separate floating supply for each transmitter see FIGURE 3 18A However if several transmitters have to share one transformer the phase must always be connected to connector in each transmitter se...

Page 28: ...All manuals and user guides at all guides com...

Page 29: ...the analogue output quantities and Appendix 1 Security lock jumper Before the settings can be changed the user must first remove the security lock jumper in connector X15 see FIGURE 4 1 The security...

Page 30: ...1 VOLTAGE OUTPUT OPENED COVER OF THE DMP248 CH1 CH2 X15 CURRENT OUTPUTS 0 20 4 20 mA VOLTAGE OUTPUTS 0 5 V 0 10 V VOLTAGE OUTPUTS 0 1 V CH1 CH2 CH1 CH2 CH1 CH2 C H 1 C H 2 C H 2 C H 2 C H 2 C H 1 C H...

Page 31: ..._________________ 27 command ASCL and the display command Mode Analog outputs Scale All jumpers are used only with the 0 1 V outputs When other out puts are in use the spare jumpers are kept in connec...

Page 32: ...THE DMP248 X6 FIGURE 4 4 Serial bus connections To connect a PC to the DMP248 transmitters via the RS 232C serial bus one of the following cables is required The type of cable depends on the terminal...

Page 33: ...stop bit if this combination is given the DMP248 programme will change the number of stop bits to 2 even or odd parity 8 data bits 2 stop bits if this combination is given the programme changes the nu...

Page 34: ...tead of the connector X17 because it is more immune to interferences Reverting to factory settings of the serial port If the serial port settings are not known no commands can be given via the serial...

Page 35: ...mper is in place when power is turned on the transmitter does not work After jumper insertion the transmitter is in STOP mode ready to receive commands The same method is used when the transmitter is...

Page 36: ...All manuals and user guides at all guides com a l l g u i d e s c o m...

Page 37: ...iven with the up and down switches LED commands can be used to calibrate the transmitter both humidity and temperature or to calibrate the analogue outputs A full range of commands can be given throug...

Page 38: ...a display keypad cover the LED commands cannot be used OPENED COVER OF THE DMP248 press switches LEDs UP DOWN ENT FIGURE 5 1 Location of press switches and LEDs Use the up and down switches marked wit...

Page 39: ...is selected with the ENT key When a menu is displayed either the first command or the currently valid setting flashes The CL key takes the transmitter back to the display mode Entering numbers When t...

Page 40: ...the first auto calibration the set frequency is activated and the auto calibration takes place e g every six hours If the setting is correct press ENT If the setting needs to be changed press CL and c...

Page 41: ...cycle If the correction exeeds the limit the calibration is ignored If the setting is correct press ENT If the setting needs to be changed press CL and change the value with arrow keys acknowledge the...

Page 42: ...enu Select Dry cal and then Calibration The following is displayed Calibration press any key to abort If you press any key the calibration is interrupted If no key is pressed the calibration takes pla...

Page 43: ...pressing CL a new lower limit is given one character at a time with the arrow keys the upper limit starts flashing acknowledge the upper limit with ENT or start changing it by pressing CL a new upper...

Page 44: ...ng it by pressing CL a new lower limit is given with the arrow keys the upper limit starts flashing acknowledge the upper limit with ENT or start changing it by pressing CL a new upper limit is given...

Page 45: ...mode If the settings need to be changed press CL Select the parameter to be changed with the arrow keys and ENT key Selecting baud rate Selecting parity Selecting data bits Selecting stop bits Full du...

Page 46: ...s used when more than one transmitter is connected to one serial bus it makes it possible to communicate with one transmitter at a time Select More in the main menu and Addr in the More menu the follo...

Page 47: ...connected to the same serial bus a single transmitter can be addressed and communicated with When the connection to the one transmitter is opened in the POLL state the transmitter goes into STOP stat...

Page 48: ...s the programme returns to Mode menu Others Pressure compensation The pressure is used for pressure compensation of the DRYCAP sensor in order to ensure the best possible measurement accuracy If the p...

Page 49: ...menu If the date is correct acknowledge it by pressing ENT this takes the programme back to the More menu If the date needs to be changed press CL first the centuries 19 start flashing use the arrow...

Page 50: ...s means that the date and time settings are not permanent Serial commands More detailed descriptions of the serial commands can be found in Appendix 1 Here only the most commonly used command sequence...

Page 51: ...one only after process is stabilized The transmitter retries untill the calibration is succesfully complited Note that normally this parameter does not have to be changed The dTdp time defines the mea...

Page 52: ...smitter memory in order to ensure the best possible measurement accuracy The pressure setting is used for pressure compensation of the DMP248 transmitter The pressure is given in hPa mbar for converti...

Page 53: ...l 1 cc ccc upper limit of channel 1 d channel 2 U voltage output I current output ee eee lower limit of channel 2 ff fff upper limit of channel 2 The bb bbb cc ccc ee eee and ff fff parameters are ent...

Page 54: ...C 0 cr Ch2 T hi 100 00 C 60 cr Scaling the analogue outputs Disconnect the security lock jumper ASCL cr Example dewpoint is scaled in the range of 40 0 C and tem perature in the range of 0 60 C ASCL...

Page 55: ...aa cr in POLL state aa address of the transmitter when more than one transmitter is connected to a serial bus 0 99 Output Td 9 3 C PPM 2733 T 22 1 C RH 10 4 RH Td 9 3 C PPM 2730 T 22 1 C RH 10 4 RH Th...

Page 56: ...the following combinations no parity 7 data bits 1 stop bit if this combination is given the DMP248 programme will change the number of stop bits to 2 even or odd parity 8 data bits 2 stop bits if thi...

Page 57: ...ode measurements output only with command SEND When in POLL state the output state is changed as follows OPEN aa cr SMODE xxxx cr aa address of the transmitter xxxx STOP RUN or POLL The OPEN command s...

Page 58: ..._________________________________________________________M210492EN A Example relative humidity calibration is performed at transmitter 2 which is in POLL state OPEN 2 cr opens the line to transmitter...

Page 59: ...s no need to recalibrate them NOTE To achieve the best accuracy in low dewpoints the DMP248 shall be sent once a year to Vaisala Service Centers for dewpoint calibration and adjustment Humidity calibr...

Page 60: ...point calibration and adjustment adjustment procedure A two point humidity calibrationand adjustment should be performed in stable conditions using saturated salt solutions as references Using serial...

Page 61: ...d the transmitter for at least 4 hours in the same space so that their temperatures have time to equalize Remove the filter cap on the transmitter Disconnect the security lock jumper before turning th...

Page 62: ...LiCl bottle dry end reference in the humidity calibrator Connect an ammeter voltmeter to the analogue outputs connector X2 Give command l At the first calibration point the LED on the left flashes ad...

Page 63: ...18 C 64 F the equilibrium humidity of the salt solution changes permanently Temperature calibration The temperature channel has been calibrated at the factory and since it is very stable adjustment sh...

Page 64: ...ands Leave the reference instrument and the transmitter for at least 4 hours in the same space so that their temperatures have time to equalize Remove the filter cap prior to calibration Disconnect th...

Page 65: ...itter for at least 4 hours in the same space so that their temperatures have time to equalize Remove the filter cap prior to calibration Disconnect the security lock jumper before turning the transmit...

Page 66: ...e and again check the transmitter against the reference Check that the reading corresponds with the reading of the reference instrument If not adjust the second point If necessary change the second po...

Page 67: ...outputs should be performed only when there is reason to believe that their adjustments have changed Using serial commands Disconnect the security lock jumper ACAL cr The outputs on channels 1 and 2 a...

Page 68: ...er end current voltage on channel 2 Using LED commands If both the analogue outputs and humidity temperature channels are calibrated the analogue outputs should be calibrated first This applies only w...

Page 69: ...d to ensure that outputs are correctly scaled for example when the output is scaled to 4 20 mA the low end of the scale is 4 mA and high end 20 mA exactly However when 0 20 mA output is used the outpu...

Page 70: ...All manuals and user guides at all guides com...

Page 71: ...ostics procedure when the power is switched on If the procedure does not reveal any errors or faults the transmitter starts operating normally If errors or faults are found check first if the DRYCAP s...

Page 72: ...ll error messages ERRS cr E40 f all out of range Temperature channel adjustment with Pt 100 simulators Switch the power off and disconnect the wires to the Pt 100 sensor from solder lugs TP5 TP6 and T...

Page 73: ...ature to be calibrated and adjust the second point gain to the reference reading Adjustment using LED commands Connect an ammeter voltmeter to the analogue outputs connector X2 Give command l and adju...

Page 74: ...a current output has been connected e g to a process computer the output current cannot be measured at the output connector X2 without disconnecting the external load The output current can however b...

Page 75: ...the press switches Vaisala Service Centers NORTH AMERICAN SERVICE CENTER Vaisala Inc 100 Commerce Way Woburn MA 01801 1068 USA Phone 1 781 933 4500 Fax 1 781 933 8029 Email us customersupport vaisala...

Page 76: ...TER 8 TECHNICAL DATA Measured variables Dewpoint temperature Measurement range 60 80 C below 0 C DMP248 outputs frostpoint Dewpoint accuracy 2 C 50 80 C see figure below FIGURE 8 1 Measurement range a...

Page 77: ...C 751 1 3 Class B Relative humidity Measurement range 0 100 RH Accuracy at 20 C RH 10 RH 0 025 RH 8 75 of reading RH 10 RH 0 7 RH 2 of reading Ppm volume concentration dry Typical measurement range 0...

Page 78: ...rrent outputs 500 0 1 V voltage output 2 k to ground 0 5 and 0 10 V voltage outputs 10 k to ground Operating temperature range electronics 40 60 C with display cover 0 50 C with power supply unit 40 4...

Page 79: ...de the housing or local display keypad option Display option 2 x 16 character alphanumeric LCD character height 3 85 mm 0 15 Keyboard 1 x 4 keypad Serial interface modules Module types RS 485 422 digi...

Page 80: ...on Radiated emissions CISPR16 class B CISPR22 Class B Immunity Electrostatic discharge ESD EN IEC 61000 4 2 EM field EN IEC 61000 4 3 Industrial environment 10 V m EFT Burst EN IEC 61000 4 4 Surge EN...

Page 81: ...16452SP Sintered filter stainless steel DRYCAPS DRYCAP S dewpoint sensor HMP230PW Power supply module 5237 Fuse 160 mA T 5x20 mm for power supply module HMP230RS RS 485 422 serial module HMP230CL Curr...

Page 82: ...All manuals and user guides at all guides com...

Page 83: ...Setting the output interval for the RUN state 89 FORM Setting the output format 90 FTIME Adding time to output 91 FDATE Adding date to output 92 SERI Serial bus settings 93 UNIT Selecting the output u...

Page 84: ...All manuals and user guides at all guides com...

Page 85: ...er the next auto calibration has been completed If you wish to activate it immediately reset the transmitter or turn it off The Max dTdp parameter defines the maximum allowed change of the dewpoint va...

Page 86: ...y displayed and the display returns to the measuring mode The calibration is not performed again even if the maximum correction is exceeded Analogue output commands AMODE Setting the analogue outputs...

Page 87: ...uantities Disconnect the security lock jumper ASEL xxx yyy cr xxx channel 1 s quantity Td ppm RH T yyy channel 2 s quantity Td ppm RH T For example dewpoint temperature is selected to be output on cha...

Page 88: ...mper ASCL cr Scales the outputs selected on channels 1 and 2 For example scaling dewpoint temperature on the range of 40 0 C and temperature 0 60 C ASCL cr Ch1 Td lo 50 00 C 40 cr Ch1 Td hi 10 00 C 0...

Page 89: ...00 Ref1 11 3 cr Press any key when ready RH 76 00 Ref2 75 5 cr If the stabilization of the sensor to the humidity in the calibrator needs to be monitored the measurement output can be repeated by givi...

Page 90: ...0 Ref1 c cr T 0 40 Ref1 0 00 cr Press any key when ready T 56 20 Ref2 55 0 cr ACAL Calibrating the analogue outputs Disconnect the security lock jumper ACAL cr Calibrates the outputs selected on chann...

Page 91: ...rrection is always degrees Centigrade even if the transmitter is using non metric units Fahrenheit in its measurement output Output via the serial bus R Starting the measurement output R cr Starts out...

Page 92: ...C PPM 2733 T 22 1 C RH 10 4 RH Td 9 3 C PPM 2730 T 22 1 C RH 10 4 RH The output format can be changed with command FORM DSEND Outputting readings of all connected transmitters once DSEND cr All trans...

Page 93: ...error code see Appendix 5 for error messages ERRS cr E40 f all out of range ECHO Turning the serial interface echo ON OFF ECHO xxx cr xxx ON or OFF When the echo is off the commands given through the...

Page 94: ...zzz zzz cr xxx xxx old format zzz zzz new format The FORM command sets the format of the outputs generated in RUN state and by SEND command NOTE Please note that capital and small letters have differ...

Page 95: ...spreadsheets FORM cr xxx xxx UUU U t TTT T t DDD D t r n cr The output is then 47 4 tab 22 4 tab 10 6 tab cr lf FTIME Adding time to output FTIME xxx cr xxx ON or OFF When FTIME is activated the curr...

Page 96: ...FDATE is activated the current date is output at the beginning of the output line The date is set with command DATE After RESET or power on the current date is 1991 01 01 Activating the date output f...

Page 97: ...nging parity and duplex 4800 O 7 1 HDX SERI 600 N 8 1 F cr changing all parameters 600 N 8 1 FDX The processor does not allow the following combinations no parity 7 data bits 1 stop bit if this combin...

Page 98: ...lid setting ADDR Setting the transmitter address ADDR aa cr aa address 0 99 The address is used when more than one transmitter is connected to one serial bus The ADDR command makes it possible to comm...

Page 99: ...STOP RUN or POLL The OPEN command sets the bus temporarily in STOP MODE so that the SMODE command can be given For example SMODE cr which mode is in use at the moment Serial mode STOP SMODE STOP cr se...

Page 100: ...o given values which can then be measured with a current voltage meter from the analogue outputs The response to ITEST command gives six out puts parameters Only the first two are relevant they show t...

Page 101: ...re also strongly effects the ppmv value The pressure is always given in hPa mbar for pressure conversion see Appendix 8 When the command is given the transmitter first gives the currently used pressur...

Page 102: ...sing XPRES After this the pressure stored using command PRES is valid again CDATE Entering calibration date CDATE xxxxxx cr xxxxxx calibration date 000101 991231 When the latest calibration date has t...

Page 103: ...with cr VERS Name and version of the programme VERS cr For example VERS cr DMP248 x yy where x yy is the programme version Outputting the transmitter settings cr For example CR DMP248 1 01 CPU serial...

Page 104: ...ng the transmitter settings also in POLL mode cr Command outputs the same information as command but it works also when the transmitter has been set to POLL mode However if there are more than one add...

Page 105: ...____________________________________________________________ 101 APPENDIX 2 POWER SUPPLY MODULE APPENDIX 2 101 POWER SUPPLY MODULE 102 Installing the power supply module 102 TECHNICAL SPECIFICATIONS 1...

Page 106: ...ach the wires from the power supply module to the power terminal on the main board of the transmitter NOTE The jumper in connector X3 has to be in position ON otherwise no power is supplied to the tra...

Page 107: ...has been changed WARNING Do not detach the power supply module from the transmitter when the power is on WARNING Do not connect the power supply to mains when it is not installed in a DMP248 transmit...

Page 108: ...All manuals and user guides at all guides com...

Page 109: ...__ 105 APPENDIX 3 INSTALLING AND USING THE RS 485 422 SERIAL PORT MODULE APPENDIX 3 105 INSTALLATION 106 OPERATION 106 NETWORK CONFIGURATION 108 Single loop operation 108 Dual loop operation 110 CHECK...

Page 110: ...HI X4 X5 R X T X X1 X2 H I H I L O LO X1 X2 R3 R6 Jumper selections for the RS 485 422 serial bus module Single pair Dual pair serial bus module Cut off the resistors R2 R3 and R4 on the main board N...

Page 111: ...be a DMP248 transmitter dynamic line adapter 120 ohm resistor in series with a 33 nF capacitor or line master If a branch line is made with a junction box the branch should be shorter than 3 meters W...

Page 112: ...line must not be terminated with a resistor alone as then the power consumption increases too much The data lines can withstand short circuit to ground and to each other They do not survive connection...

Page 113: ...7 The serial settings of the transmitter must also be 4800 E 7 1 FDX and the transmitter must be in STOP mode If these factory settings have been changed they must be changed back Connect the RS 232C...

Page 114: ...X2 Remount the RS 485 422 serial module Close the cover When all transmitters on the network have been configured switch them off Dual loop operation The following procedure must be repeated with all...

Page 115: ...ter it can be any number between 1 and 99 In this example the address is 22 addr 22 Address 22 Set the serial bus settings according to your system This setting will become valid after next RESET or p...

Page 116: ...asurement readings are asked when the transmitter is in POLL mode then the command must include the address of the transmitter If the settings of the transmitter need to be changed the transmitter is...

Page 117: ...ve been given close the line to transmitters the command closes all open lines close line closed CLOSE command is always given without address If no lines are open there will be no response to the CLO...

Page 118: ...the listings will have two line feeds when also the DMP248 transmitters send line feed Specifications Connections Berg sockets on the main board screw terminals 0 5 mm wires stranded wires recommende...

Page 119: ...PENDIX 4 INSTALLING AND USING THE CURRENT LOOP MODULE INSTALLATION 116 OPERATION 116 NETWORK CONFIGURATION 118 Single loop operation 118 Single loop wiring 119 Dual loop operation 120 Dual loop wiring...

Page 120: ...le X1 X2 D A T A LO O P S TX RX X17 Connect the data wires to screw terminal X6 on the main board Switch the power on Operation The DMP248 transmitters can either be given an address or operated witho...

Page 121: ...IRING HOST COMPUTER RX LO RX HI T XHI T X LO RXLO RX HI T XHI T X LO RX LO RX HI T XHI T X LO RX LO RX HI TX HI TX LO RX LO RX HI 120R 33 nF T XHI T XLO RX LO RX HI 120R 33 nF 120R 33 nF NOTE DYNAMIC...

Page 122: ...loop supply is current limited the data lines can withstand short circuit to ground and to each other They do not survive connection of supply voltage to the data lines The module must be mounted on t...

Page 123: ...port of the terminal to connector X17 on the top of the main board and switch the power on RX GND TX X17 Single loop wiring Set the address of the transmitter it can be any number between 1 and 99 In...

Page 124: ...hrough wiring see figure on page 2 The following procedure must be repeated with all transmitters Open the transmitter cover Pull out the digital current loop module if it is already mounted Set the s...

Page 125: ...eri 2400 e 7 1 f 2400 E 7 1 FDX Switch echo on echo on ECHO ON Change the serial output mode into POLL smode poll Serial mode POLL NOTE The SMODE command must be given last NOTE The transmitter output...

Page 126: ...e STOP mode Open the line to the transmitter open 22 cr DMP 22 line opened for operator commands Transmitter no 22 is now temporarily set to STOP mode it accepts commands without address until CLOSE c...

Page 127: ...clude its address send 22 Td 47 4 C T 29 1 C Addresses from 1 to 99 can be used According to the 20 mA current loop standard current flows with no transmission on line A maximum of 6 devices can be co...

Page 128: ...Loop current 12 30 mA space 0 2 mA mark 30 mA max Connections Berg sockets on the main board screw terminals 0 5 mm wires stranded wires recommended Assembly plug in module Board dimensions 40 x 28 mm...

Page 129: ...____________________ VAISALA ________________________________________________________________________ 125 APPENDIX 5 ERROR MESSAGES APPENDIX 5 125 ERROR MESSAGES 126 Errors after reset 126 Errors duri...

Page 130: ...rts operating normally If errors or faults are found the transmitter outputs an error message The error messages can be divided into two groups error messages after the reset and error messages during...

Page 131: ...Errors during operation Two types of errors are possible during operation of the transmitters The first type indicates that no frequency comes from the converter Display Serial bus E40 f all out of ra...

Page 132: ...s no frequency at all a frequency missing from the RH channel a frequency missing from the T channel The second error type indicates erroneous y values used in internal calculations Display Serial bus...

Page 133: ...APPENDIX 6 All manuals and user guides at all guides com...

Page 134: ...uts of the screw terminal are closed When the relay is activated these outputs are opened and the C and NO outputs are closed If required the relays can be activated by inserting a jumper to the test...

Page 135: ...All manuals and user guides at all guides com...

Page 136: ...ibre washers M4 screw and washer for protective ground terminal replace the plastic plug with cable gland for 7 12 mm cable cable strip wires only 5 mm use crimped terminal for ground wire if stranded...

Page 137: ...ing the setpoint the output is in use LO ON the alarm is activated if the value goes below the setpoint the output is in use HI OFF the alarm is activated by exceeding the setpoint the output is not i...

Page 138: ...00 00 0 00 RH When giving this command first enter the channel number i e the number of the alarm output you wish to use 1 or 2 Then select the quantity you wish to have on that channel Td ppm RH or T...

Page 139: ...annel 1 or ALARM 2 ON channel 2 Note that you can also activate the outputs when giving other parameters with command ALARM Examples of activating the outputs with command ALARM alarm 1 Td HI 20 5 Ch1...

Page 140: ...All manuals and user guides at all guides com...

Page 141: ...chart Multiplication factors NOTE conversions from mmHg and inHg are defined at 0 C and for mmH2O and inH2O at 4 C FROM TO hPa mbar PaN m2 0 01 mmHg torr 1 333224 inHg 33 86388 mmH2O 0 09806650 inH2O...

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