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Vaisala Drycap DMT152, User Manual

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Table 36 LED command

Syntax

Description

LED

<cr>

Enter the LED voltage at the prompt.

Example:

led

Ch 1 Led Voltage    :     2.80 V

Ch 2 Led Voltage    :     2.80 V

5.8.7 Restore Factory Settings

Use the 

FRESTORE

 command to restore the factory settings to the transmitter.

FRESTORE

<cr>

All user settings will be lost when you enter the 

FRESTORE

command.

CAUTION!

DMT152 User Guide

M210865EN-J

52

Summary of Contents for Drycap DMT152

Page 1: ...M210865EN J User Guide Vaisala DRYCAP Dew Point Transmitter DMT152...

Page 2: ...inal English versions In ambiguous cases the English versions are applicable not the translations The contents of this document are subject to change without prior notice Local rules and regulations m...

Page 3: ...ption 17 4 3 2 Connection Cables 18 4 3 3 Power Supply Requirements 19 4 4 Loop Powered Display 19 4 5 Sampling from Process 20 4 6 Sampling Accessories 21 4 6 1 DMT242SC Sampling Cell 21 4 6 2 DMT242...

Page 4: ...Output 46 5 6 2 Stop Measurement Output 47 5 6 3 Set Output Interval 47 5 6 4 Output a Reading Once 47 5 7 Troubleshooting and Maintenance Commands 48 5 7 1 Display Currently Active Errors 48 5 7 2 T...

Page 5: ...8 Technical Data 60 8 1 Specifications 60 8 2 Spare Parts and Accessories 63 8 3 Dimensions 65 Warranty 67 Technical Support 67 Recycling 67 Table of Contents 3...

Page 6: ...ring Diagram 20 Figure 8 Sampling Cells DMT242SC2 Left and DMT242SC Right 22 Figure 9 DSC74 Sampling Cell with Accessories 23 Figure 10 DSC74B 24 Figure 11 Removing the Leak Screw 25 Figure 12 Default...

Page 7: ...Table 18 FORM Command Parameters 41 Table 19 FORM Command Modifiers 41 Table 20 UNIT command 42 Table 21 SMODE Command 43 Table 22 Selection of Output Modes 43 Table 23 XPUR command 44 Table 24 PRES a...

Page 8: ...DMT152 User Guide M210865EN J 6...

Page 9: ...s manufactured from March 2017 onwards Added information about the output noise minimization wiring option M210865EN G October 2015 Updated the dew point temperature measurement accuracy specification...

Page 10: ...uct 1 4 Trademarks DRYCAP is a registered trademark of Vaisala Oyj All other product or company names that may be mentioned in this publication are trade names trademarks or registered trademarks of t...

Page 11: ...hnology page 12 DMT152 Measurement Parameters Table 3 DMT152 Measurement Parameters Parameter Abbreviation Metric Unit Non Metric Unit Dew point frost point temperature TDF C F Parts per million H2O p...

Page 12: ...e transmitter will void the warranty 1 2 3 4 5 Figure 1 DMT152 Probe Parts 1 4 pin M8 connector I analog output channels and operating power 2 4 pin M8 connector II shown with protective cap digital o...

Page 13: ...s are adequately protected against ESD for their intended use However it is possible to damage the product by delivering an electrostatic discharge when touching removing or inserting any objects insi...

Page 14: ...er is powered up when the measured environment changes rapidly During auto calibration the sensor is warmed for a short period 1 min and the sensor capacitance values are evaluated at the elevated tem...

Page 15: ...the system or if oil is collected to the filter over a longer period of time The maximum measurement pressure is 50 bara 725 psia absolute pressure for direct measurement If the gas temperature is hig...

Page 16: ...he sealing ring Instead apply PTFE tape or suitable sealant paste to the thread Follow the application instructions of the paste 3 Make sure that the threads on the mounting point are of the correct t...

Page 17: ...ted reading after one minute but accurate measurement will only be available after the startup procedure is complete Normal operation is typically achieved in 10 15 minutes If the measurement environm...

Page 18: ...supply lines are internally connected You can use either one of them but do not connect more than one supply voltage in permanent installations Temporary simultaneous use with the USB serial interfac...

Page 19: ...4 V mA 2 Vs 1 3 A 4 2 RS485 B Figure 5 Output Noise Minimization Wiring Option The wiring of pinouts 1 4 in ports I and II in the output minimization option is described in the following table Table...

Page 20: ...ble with LED indicator for analog channel 2 90 angled M8 female threaded connector USB serial interface cable For cable order codes see Spare Parts and Accessories page 63 Avoid using long cables over...

Page 21: ...rrent DMT152 can be powered by the MI70 indicator or the Vaisala USB cable However the power supplied by these devices may not be enough for all functions of the transmitter for example the current ou...

Page 22: ...measurement of the air or gas is not possible or desirable This may be related to for example a high process temperature protecting the sensor from water spikes the need to easily detach the instrume...

Page 23: ...h as possible Dead ends should be avoided Also minimizing the number of connections helps in avoiding leaks If possible prepare for measurements by flushing the sampling lines with dry gas Flow Vaisal...

Page 24: ...pipe welded connector Swagelok 1 4 2 G1 2 3 G1 4 4 G3 8 4 6 3 DSC74 Sampling Cell with Quick Connector and Leak Screw The DSC74 has been designed especially for compressed air lines The sampling cell...

Page 25: ...and G3 8 to G1 4 ISO that are supplied with each DSC74 unit When using the DSC74 seal the threads of the quick connector or thread adapter carefully with PTFE thread seal tape Tighten with an open en...

Page 26: ...ilable from Vaisala In the basic operation of the DSC74B the gas flows to the sensor from the front and the outlet is on the side To have the measurement done at atmospheric pressure the inlet and out...

Page 27: ...l outlet to protect the sensor from ambient humidity disturbing the measurement The coil can also be used as a cooling coil for sampling from high temperature processes DSC74C parts are Sampling cell...

Page 28: ...3 4 1 2 Figure 12 Default Assembly of DSC74C 1 Gas goes in The coil can also be used here 2 Gas comes out 3 Coil 4 Valve DMT152 User Guide M210865EN J 26...

Page 29: ...ive Assembly of DSC74C for Tight Spaces 1 Gas comes out 2 Coil 3 Thread max size 7 mm 4 Gas goes in 5 Valve The thread size cannot exceed 7 mm Use the provided adapter to avoid damage to the transmitt...

Page 30: ...es The flange is compatible with ISO G1 2 threaded transmitters Vaisala does not provide the flange counterpart only the attachment for DMT152 Figure 14 NW40 Mounting Flange 30 1 18 17 8 0 70 41 2 1 6...

Page 31: ...ou have already connected it 2 Insert the media that came with the cable or download the driver from www vaisala com software 3 Execute the USB driver installation program setup exe and accept the ins...

Page 32: ...ect COM port is selected in the Serial line to connect to field You can check which port the USB cable is using with the Vaisala USB Instrument Finder program that has been installed in the Windows St...

Page 33: ...e user is in bold type The notation cr refers to pressing the carriage return key the Enter key on your computer keyboard Enter a cr to clear the command buffer before starting to enter commands Note...

Page 34: ...alculation OPEN 0 99 Open temporary connection to a device that is in POLL mode PRES Set value for pressure compensation R Start the continuous outputting RESET Reset the transmitter S Stop the contin...

Page 35: ...lo 80 00 C Ch1 Tdf hi 20 00 C Ch2 Tdf lo 0 00 C Ch2 Tdf hi 0 00 C If the transmitter is in POLL mode but a connection has not been opened using the OPEN command issue the command For a description of...

Page 36: ...rozen 1110 Settling period after purge output frozen 0000 Normal measurement Table 10 STAT command Syntax Description STAT cr Display the status of the transmitter in 4 characters Example STAT 0000 It...

Page 37: ...e The LED will not light up for the limit alarm Additionally DMT152 has a malfunction alarm that is always enabled in normal operation mode The malfunction alarm can also be enabled for a channel in O...

Page 38: ...d by the current being at the maximum of the scale 20 mA For voltage output an active alarm is indicated by the voltage being at the maximum of the selected scale For example if the voltage output sca...

Page 39: ...00 Limit Hi 0 00 Hysteresis 0 00 Level Lo 0 00 Level Hi 0 00 Avoid enabling more than one alarm type for a channel 5 3 2 Purge Status Alarm The transmitter can temporarily freeze the output when meas...

Page 40: ...is malfunctioning the channel output is set to a pre defined level This overrides the normal measurement output of the channel You can specify the level using the AERR command Table 15 AERR command S...

Page 41: ...meter Example asel tdf ppm Ch1 Tdf lo 80 00 C Ch1 Tdf hi 20 00 C Ch2 ppm lo 0 00 ppm Ch2 ppm hi 1000000 00 ppm 5 4 Configuring Serial Line Operation 5 4 1 Set Serial Line Settings Use the SERI command...

Page 42: ...milliseconds sdelay 30 Serial delay 30 5 4 3 Set Transmitter Address To operate in the POLL mode the transmitter must have an address If multiple transmitters share the same serial line each transmit...

Page 43: ...e 18 FORM Command Parameters Parameter Description TDF Dew point frost point temperature PPM Water content in parts per million PPB Water content in parts per billion PPMW Water content in parts per m...

Page 44: ...as for the STAT command see Show Transmitter Status page 33 TIME Current time see the description of the TIME command Set Time page 51 Ux Shows the name of the measurement unit using x number of char...

Page 45: ...g mode can be used when more than one transmitter is connected to one serial bus When set to POLL state the transmitters communicate one at a time when the specific transmitter address is called on th...

Page 46: ...ordering the product use the commands below to enable the pressure compensation and set the pressure value Table 24 PRES and XPRES command Syntax Description PRES pp pppp cr pp pppp Absolute pressure...

Page 47: ...onversions from mmHg and inHg are defined at 0 C and from mmH2O and inH2O at 4 C You can also set the pressure compensation value when you connect DMT152 to the MI70 indicator When using MI70 the pres...

Page 48: ...urement values as an ASCII text string to the serial line The format of the measurement message is set with the FORM command Table 27 R Command Syntax Description r cr Starts continuous measurement ou...

Page 49: ...t S MIN or H Example intv 1 min Output interval 1 MIN The shortest output interval with n 0 outputs the measurement messages as quickly as the transmitter s internal measurement cycle produces them wi...

Page 50: ...h calibrated multimeter The command uses the currently selected analog output types for the channels voltage or current so you do not have to specify the unit Before testing you can verify the current...

Page 51: ...lid for the currently selected analog output modes Table 31 ACAL command Syntax Description ACAL channel cr channel Analog output channel 1 or 2 Example acal 1 Ch1 I1 mA 0 166 I2 mA 18 1 3 61058569E 0...

Page 52: ...LL Mode Use the OPEN command to connect to a transmitter that is in POLL mode Table 33 OPEN command Syntax Description OPEN aa cr aa address of the transmitter to connect to range 0 99 Example open 1...

Page 53: ...30 00 5 8 5 Reset Transmitter When the RESET command is given the transmitter will restart as if it had just been powered on All transmitter settings are retained The serial line mode of the transmit...

Page 54: ...ample led Ch 1 Led Voltage 2 80 V Ch 2 Led Voltage 2 80 V 5 8 7 Restore Factory Settings Use the FRESTORE command to restore the factory settings to the transmitter FRESTORE cr All user settings will...

Page 55: ...pressure prior to removing the transmitter When the transmitter is removed for maintenance cap the hole with a capped nut This way the process can be running although the transmitter is not in place...

Page 56: ...hin its accuracy specifications You can perform a simple field checking operation by comparing the readings of DMT152 and DM70 handheld dewpoint meter with a calibrated reference probe For more inform...

Page 57: ...prompted You can change the pressure compensation value only needed for ppm calculation and the molar mass of the measurement gas The pressure must be entered in bara to enter the value in psia use th...

Page 58: ...the reading from DMT152 should be within 4 C Td of the reading from the reference probe Some notes on using the MI70 indicator with the DMT152 If you disconnect DMT152 while the MI70 indicator is on t...

Page 59: ...erial Settings If you are not sure what the serial settings of your transmitter are follow these steps to view and change the settings 1 Make sure there are no other transmitters on the serial line 2...

Page 60: ...on Settings page 29 before you can connect to the transmitter in error state 7 4 Error Codes The transmitter has error codes that can be displayed on the serial line using the ERRS command See section...

Page 61: ...fore connecting the MI70 indicator or USB cable See Power Supply Requirements page 19 T meas error Internal error can be caused by damage to the sensor F meas error Internal error can be caused by dam...

Page 62: ...range 100 20 C 148 68 F Td Typical response time 63 90 at a gas temperature of 20 C 68 F and pressure of 1 bar 20 80 C Td 0 5 min 7 5 min 80 20 C Td 2 s 5 s Typical long term stability Better than 2 C...

Page 63: ...Pressure 0 50 bar 725 psia Measured gases Non corrosive gases Sample flow rate No effect on measurement accuracy EMC compliance EN61326 1 Industrial environment Table 40 Inputs and Outputs Property De...

Page 64: ...wn to 40 C 40 F or pressure up to 50 bar 725 psia the supply voltage is 21 28 VDC Table 41 Mechanical Specifications Property Description Value Housing material wetted parts AISI316L Stainless steel m...

Page 65: ...ling ring set UNF copper 3 pcs 221563SP Stainless steel mesh filter 18 m 220957SP 110 240 VAC external power supply POWER 1 Plug kit ISO 1 2 218773 Plug kit NPT 1 2 222507 Loop powered external displa...

Page 66: ...hreaded connector HMP50Z1000SP Sampling Cells Available for ISO G1 2 Basic sampling cell DMT242SC With Swagelok 1 4 male connectors DMT242SC2 With a quick connector and leak screw DSC74 Two pressure s...

Page 67: ...1 2 ISO 228 1 33 1 3 AW30 1 18 29 5 1 16 128 5 5 06 76 2 99 32 5 1 28 12 0 47 1 2 NPT 29 5 1 16 120 5 4 74 32 5 1 28 76 2 99 12 0 47 3 4 16 UNF 5 8 18 UNF 12 0 47 120 5 4 74 32 5 1 28 76 2 99 29 5 1 1...

Page 68: ...DMT152 User Guide M210865EN J 66...

Page 69: ...of the warranty for each product Technical Support Contact Vaisala technical support at helpdesk vaisala com Provide at least the following supporting information as applicable Product name model and...

Page 70: ...DMT152 User Guide M210865EN J 68...

Page 71: ......

Page 72: ...www vaisala com...

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