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When using the DSC74, seal the threads of the quick connector or thread adapter carefully
with PTFE thread seal tape. Tighten with an open-end wrench.

Figure 12 DSC74 Sampling Cell with Accessories

Thread adapter type G3/8" - G1/2"

Thread adapter type G3/8" - G1/4"

Quick connector

Leak screw

Sampling cell body (DMT242SC)

4.6.4 DSC74B Two-Pressure Sampling Cell

The DSC74B and DSC74C sampling cells are enhanced versions of the DSC74. The body is

designed in a way that it is possible to measure at both system pressure and atmospheric

pressure.

The DSC74B limits the flow rate with a fixed leak screw. The flow is optimized for pressures 3 ...

10 barg. The fixed leak screw eliminates the risk of opening the leak screw fully by accident

and this way emptying a gas vessel. The maximum flow can be increased, if needed, by

removing the leak screw and adjusting the flow manually with the valve. Harmful gases can be

recovered by connecting a collection system at the outlet (not available 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 outlet are

reversed. Then the reducing parts supplied (G3/8" - G1/2" or G3/8" - G1/4") on the outlet side

help to protect the sensor from ambient humidity coming in.

DMT143 User Guide

M211435EN-J

Содержание DRYCAP DMT143

Страница 1: ...M211435EN J User Guide Vaisala DRYCAP Dew Point Transmitter DMT143...

Страница 2: ...change without prior notice Local rules and regulations may vary and they shall take precedence over the information contained in this document Vaisala makes no representations on this document s comp...

Страница 3: ...arts 12 2 3 1 DMT143 with G1 2 ISO228 1 Thread 12 2 3 2 DMT143 with NPT Thread 13 2 3 3 DMT143L with G1 2 ISO228 1 Thread 14 2 4 Loop powered Display 14 2 5 Connection Cables 15 2 6 Sampling Accessori...

Страница 4: ...M70 Handheld Dew Point Meter 38 6 Modbus Communication 40 7 Serial Communication 41 7 1 Connecting to the Serial Interface 41 7 2 Terminal Application Settings 41 7 3 Accessing Serial Interface in Dev...

Страница 5: ...s 58 7 9 4 Set Serial Line Response Time 59 7 10 Other Commands 59 7 10 1 Opening the Transmitter in POLL Mode 59 7 10 2 Closing the Connection to a Transmitter in POLL Mode 59 7 10 3 Configure the Al...

Страница 6: ...rmat 75 A 3 2 16 Bit Integer Format 76 A 4 Modbus Registers 76 A 4 1 Measurement Data Registers 77 A 4 2 Status Registers 77 A 4 3 Configuration Registers 78 A 4 4 Test Value Registers 80 A 4 5 Device...

Страница 7: ...ge 26 Figure 10 Example of Current Consumption During Autocalibration 27 Figure 11 Sampling Cells DMT242SC2 left and DMT242SC right 29 Figure 12 DSC74 Sampling Cell with Accessories 30 Figure 13 DSC74...

Страница 8: ...Table 15 Error Messages in Insight Software 67 Table 16 Error Codes in MI70 67 Table 17 Measurement Performance 69 Table 18 Operating Environment 70 Table 19 Inputs and Outputs 70 Table 20 Mechanical...

Страница 9: ...for DMT143L added Analog output accuracy specification added Accuracy specification updated for DMT143L variant with DRYCAP 180M sensor Filter spare part information updated M211435EN G January 2017...

Страница 10: ...ciently Lists tools needed to perform the task Indicates that you need to take some notes during the task 1 4 Trademarks Vaisala and DRYCAP are registered trademarks of Vaisala Oyj Windows is either a...

Страница 11: ...0 60 C 94 140 F operating pressure 0 20 bara 0 290 psia current mA analog output 1 RS 485 digital output with Modbus RTU support DMT143L with DRYCAP 180S sensor G1 2 ISO228 1 mechanical connection mea...

Страница 12: ...Dew point measurement accuracy up to 2 C 5 4 F Td in air or N2 Operating pressure range DMT143 0 50 bara 725 psia DMT143L 0 20 bara 0 290 psia Configurable for optimum dew point measurement accuracy P...

Страница 13: ...bus Communication page 40 Connecting to the Serial Interface page 41 DMT143 Specifications page 69 2 2 1 Connectivity to Vaisala Insight Software The transmitter can be connected to Vaisala Insight so...

Страница 14: ...ring Must be used with the G1 2 ISO228 1 connection thread 6 24 mm nut 7 Connection thread G1 2 ISO228 1 8 DRYCAP 180D sensor protected with sintered filter When the transmitter is delivered the filt...

Страница 15: ...arts Model with NPT Thread 1 Transmitter body Type label is applied here 2 Digital output non isolated RS 485 3 Alarm LED 4 Analog output 5 30 mm nut 6 Connection thread NPT 1 2 7 DRYCAP 180D sensor p...

Страница 16: ...e G1 2 ISO228 1 connection thread 6 24 mm nut 7 Connection thread G1 2 ISO228 1 8 DRYCAP 180M or DRYCAP 180S sensor protected with sintered filter 2 4 Loop powered Display DMT143 can be connected to a...

Страница 17: ...e 4 Nokeval 301 Loop powered Display The loop resistance of the display must be included in the loop resistance calculation for the complete current loop For the loop resistance of the display refer t...

Страница 18: ...malfunction CAUTION The transmitter body does not have user serviceable parts inside and is not designed to be opened Opening the transmitter will void the warranty CAUTION 2 7 1 ESD Protection Electr...

Страница 19: ...pliances This product is in conformity with the provisions of the following EU directives EMC Directive RoHS Directive Conformity is shown by compliance with the following standards EN 61326 1 Electri...

Страница 20: ...d on When measuring very dry conditions the transmitter performs the autocalibration at shorter intervals A significant change in dew point or temperature may also trigger the autocalibration During a...

Страница 21: ...he sensor temperature above 0 C When measuring in temperatures below 0 C the supply voltage must be 24 28 VDC More Information Power Supply Requirements page 25 3 2 DMT143 Startup Sequence When the tr...

Страница 22: ...rge with the DMT143L variant with DRYCAP 180S the default purge interval is 12 hours 3 3 Alarm LED The alarm LED at the back of the transmitter provides a visual indication of the transmitter s status...

Страница 23: ...More Information Vaisala Insight Software page 36 Operation with DM70 Handheld Dew Point Meter page 38 Configure the Alarm LED page 60 Chapter 3 Functional Description 21...

Страница 24: ...e settings may not be right for your RS 485 line 3 You may need to change the transmitter s serial output format to suit your needs More Information Vaisala Insight Software page 36 Operation with DM7...

Страница 25: ...sample pipeline in the sampling cells without the need of any additional mechanical support You can use a standard G1 2 T shaped pipe fitting not available from Vaisala when installing DMT143 into a...

Страница 26: ...ower 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 service cab...

Страница 27: ...4 4 1 Power Supply Requirements The minimum supply voltage required by the DMT143 transmitter depends on the analog output type that is used For voltage output 12 28 VDC For current output 18 28 VDC T...

Страница 28: ...I70 indicator or the USB service cable to the digital port while the transmitter is powered from the analog port The following figure shows a typical duty cycle during sensor purge at room temperature...

Страница 29: ...e 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 instrument from a pressuri...

Страница 30: ...utlet valves possible flow meter by themselves 4 6 2 DMT242SC2 Sampling Cell with Swagelok Connectors The DMT242SC2 is similar to DMT242SC but connections are made easy The sampling cell includes weld...

Страница 31: ...leak screw then turning 1 2 turn to open it Then the air coming out will make a barely audible little hiss and it can be lightly felt when putting a hand in front of the air stream Do not open the le...

Страница 32: ...te with a fixed leak screw The flow is optimized for pressures 3 10 barg The fixed leak screw eliminates the risk of opening the leak screw fully by accident and this way emptying a gas vessel The max...

Страница 33: ...ead G3 8 Connection part with a needle valve and an integrated leak screw Reducing Nipple thread adapter G3 8 G1 2 Reducing Adapter thread adapter G3 8 G1 4 1 2 Figure 13 DSC74B 1 Gas goes in 2 Gas co...

Страница 34: ...utlet 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 thr...

Страница 35: ...3 4 1 2 Figure 15 Default Assembly of DSC74C 1 Gas goes in The coil can also be used here 2 Gas comes out 3 Coil 4 Valve Chapter 4 Installation 33...

Страница 36: ...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 transmitter D...

Страница 37: ...cess wall or pipe note that a closing valve may be needed on both sides of the installed transmitter so that the sensor head can be removed from the process for calibration or maintenance 1 2 3 4 Figu...

Страница 38: ...er up In MODBUS mode the device does not output anything after power up More Information DMT143 Startup Sequence page 19 Power Supply Requirements page 25 Set Serial Line Operating Mode page 57 5 2 Va...

Страница 39: ...SB connection cable order code 219690 Before connecting the transmitter to a PC disconnect the cables from both the analog and digital ports of the transmitter 1 Open the Insight software 2 Connect th...

Страница 40: ...se incorrect values to be displayed If you have altered the serial port settings of the DMT143 always make sure you switch off the other power supply disconnect the Analog cable if in use before power...

Страница 41: ...option is equivalent to using the FRESTORE command on the serial line Note that also the MI70 indicator will revert to its factory configuration when using the Factory settings option on the MI70 More...

Страница 42: ...following table lists the default Modbus serial settings of devices ordered with the Modbus configuration option Table 6 Default Modbus Serial Communication Settings Description Default Value Serial b...

Страница 43: ...l application for Windows available for download at www vaisala com software and a USB serial interface cable 1 Connect the USB serial interface cable between your PC and the RS 485 port of the DMT143...

Страница 44: ...connect to the serial line with a transmitter with Modbus output You can also use the procedure to retrieve the communication settings of your device if you do not know them You must use the Vaisala...

Страница 45: ...r key on your computer keyboard Enter a cr to clear the command buffer before starting to enter commands Table 8 List of Serial Commands Command Description ESC Stop the continuous outputting of RUN m...

Страница 46: ...s SMODE mode Show or set startup serial mode RUN STOP POLL or MODBUS SNUM Display transmitter serial number SYSTEM Show transmitter firmware information UNIT m n Select metric or non metric units VERS...

Страница 47: ...ss 0 Pressure 1 013 bar Filter 0 100 7 5 2 Show Analog Output Mode Use the AMODE command to show the analog output mode AMODE cr Example amode Ch1 output 4 20 mA 7 5 3 Show Firmware Version VERS cr Ex...

Страница 48: ...49 Parameter flash check sum error Device settings corrupted 50 INFOA check sum error Additional configuration settings corrupted 51 SCOEFS check sum error Sensor coefficients corrupted 52 CURRENT che...

Страница 49: ...PEN PRES R RESET SDELAY SEND SERI SMODE SNUM SYSTEM TIME UNIT VERS XPRES 7 6 Configuring Analog Output 7 6 1 Set Analog Output Parameters and Scaling Use the ASEL command to show or set the output par...

Страница 50: ...6000 Ch1 H2O lo 0 00 ppm Ch1 H2O hi 6000 00 ppm 7 6 2 Set Analog Output Error Notification If the transmitter is malfunctioning the analog output is set to a specified level This overrides the normal...

Страница 51: ...command the range is 0 5 5 V 80 25 C Note that the 30 C Td point is still at 5 V 7 6 4 Test Analog Output You can test the operation of the analog output with the ATEST command by forcing the output t...

Страница 52: ...Tdf 17 75 F Tdfatm 5 25 F H2O 954 ppm Tdf 17 23 F Tdfatm 5 72 F H2O 930 ppm Tdf 17 06 F Tdfatm 5 88 F H2O 922 ppm Tdf 16 97 F Tdfatm 5 96 F H2O 918 ppm Outputting the results continues in intervals is...

Страница 53: ...nly necessary if the target transmitter is in POLL mode and has not been accessed with the OPEN command Example send Tdf 16 71 F Tdfatm 6 19 F H2O 907 ppm 7 8 Configuring Measurement Parameters 7 8 1...

Страница 54: ...places t Tabulator r Carriage return n Line feed String constant length 1 15 characters xxx ASCII code value decimal of a special character for example 027 for ESC ADDR Transmitter address 0 255 ERR...

Страница 55: ...56 checksum form 3 2 Tdf Tdf U3 6 0 H2O H2O U5 CS2 r n Output example Tdf 9 74 C H2O 2632 ppm C4 Tdf 9 72 C H2O 2636 ppm C6 Command to set output format as Tdf and ppm with start of text ASCII charact...

Страница 56: ...at the factory according to the order form You can view and set a new value using the PRES command Command XPRES should be used if the value is changed frequently The value set using the XPRES command...

Страница 57: ...nit Use the UNIT command to select metric or non metric output units UNIT x cr Syntax Description x Selects the unit type to output m metric units for example Celsius n nonmetric units for example Fah...

Страница 58: ...r adjustment parameters directly This command is useful for restoring the desired adjustments and removing the effects of user adjustment without having to perform the factory reset This command is pr...

Страница 59: ...mmands available after opening a line to the transmitter using the OPEN command Use with RS 485 buses where multiple transmitters can share the same line MODBUS No automatic output Measurement outputs...

Страница 60: ...l line to 9600 baud no parity 7 data bits and 1 stop bit seri 9600 e 7 1 SCI Baud P D S 9600 E 7 1 More Information Operation with DM70 Handheld Dew Point Meter page 38 7 9 3 Set Transmitter Address T...

Страница 61: ...Serial delay 30 7 10 Other Commands 7 10 1 Opening the Transmitter in POLL Mode Use the OPEN command to connect to a transmitter that is in POLL mode OPEN address cr Syntax Description address Transmi...

Страница 62: ...point alarm Level Dew point temperature above which the alarm LED will turn red The LED will turn green when the measured dew point temperature falls below this level Range 70 60 C Tdf Example show cu...

Страница 63: ...en the transmitter will restart as if it had just been powered on All transmitter settings are retained The serial line mode of the transmitter will be set to the mode that was set using the SMODE com...

Страница 64: ...reak the sensor when the filter is removed CAUTION If the transmitter has the optional stainless steel filter HM47453SP for vacuum applications installed note that it has tapered threads and is not me...

Страница 65: ...4 Field Check Using DM70 Handheld Dew Point Meter Vaisala recommends the following equipment for field checking A fully charged MI70 indicator the measurement display that is included in the DM70 pack...

Страница 66: ...heck and adjust the environment settings if prompted Refer to the DM70 User s Guide for the settings of the DMP74B probe 6 Disable the Auto power off function of the MI70 indicator to prevent the indi...

Страница 67: ...parts inside and is not designed to be opened Opening the transmitter will void the warranty CAUTION If there is a problem with your transmitter that you are unable to solve yourself or with the help...

Страница 68: ...he active errors using Vaisala Insight PC software or the ERRS command Check the power supply Unable to access transmitter on the RS 485 line Possible causes Incorrect wiring unknown serial settings t...

Страница 69: ...Supply voltage out of range 55 Supply voltage is too low Check and correct the power supply and wiring Firmware checksum mismatch 49 Internal transmitter failure Power cycle the device and if necessar...

Страница 70: ...upted 51 100hex Sensor coefficients corrupted 52 200hex Main configuration settings corrupted 53 800hex Supply voltage out of range 55 10000hex Non volatile memory read write failure 57 20000hex Firmw...

Страница 71: ...nt range typical 70 60 C 94 140 F Td Accuracy in air or N2 1 2 C 3 6 F Td see graph below 0 20 20 0 10 30 10 20 30 10 30 40 50 60 40 Dew point temperature C Temperature of measured gas C 40 30 20 10 4...

Страница 72: ...140 F Relative humidity 0 100 RH Pressure 1 0 50 bara 725 psia Sample flow rate No effect for measurement accuracy Storage temperature 40 60 C 40 140 F 1 For extended temperature below 0 C 32 F or pre...

Страница 73: ...nostics Typical 220 mA pulsed Table 20 Mechanical Specifications Property Description Value Mechanical connection ISO G1 2 in or NPT 1 2 Housing material Stainless steel AISI316L Weight G thread versi...

Страница 74: ...28 1 10 12 57 2 24 22 5 0 89 91 6 3 61 0 47 Figure 20 DMT143 Dimensions Model with ISO Thread 32 1 26 AW30 NPT1 2 12 22 5 0 89 49 1 1 93 91 6 3 61 0 47 Figure 21 DMT143 Dimensions Model with NPT Threa...

Страница 75: ...rnal display with relays 234759 Installation flange ISO DM240FASP Sintered filter DMT143 DRW010335SP Stainless steel filter DMT143 DMT143L HM47453SP Stainless steel sintered filter 38 um DMT143L HM472...

Страница 76: ...le 225229SP Sampling Cells Basic sampling cell DMT242SC With Swagelok 1 4 in male connectors DMT242SC2 With quick connector and leak screw DSC74SP Two pressure sampling cell DSC74BSP Two pressure samp...

Страница 77: ...on Code Hexadecimal Name 03 03hex Read Holding Registers 16 10hex Write Multiple Registers 43 14 2Bhex 0Ehex Read Device Identification A 3 Data Encoding A 3 1 32 Bit Floating Point Format Registers u...

Страница 78: ...t Integer Format Some 16 bit integer values in the data registers are scaled to include the necessary decimals The scaling factors for those values are shown in the register tables Table 25 16 bit Sig...

Страница 79: ...f 100 16 bit signed integer C 262 0105hex Dew frost point temperature at 1 atm Td fa 100 16 bit signed integer C 267 010Ahex Water concentration ppm 16 bit signed integer ppm Accessing unavailable te...

Страница 80: ...ge out of range 55 65536 Non volatile memory read write failure 57 131072 Firmware checksum mismatch 49 If several errors are active at the same time the Modbus Error Code register contains the sum of...

Страница 81: ...eger 0 N81 1 N82 2 E81 3 E82 4 O81 5 O82 1540 0603hex Response delay 16 bit integer 0 1020 ms 1541 0604hex Interface mode 16 bit integer 6 MODBUS 1542 0605hex Restart device 16 bit integer 1 Restart t...

Страница 82: ...ct Id Decimal Object Id Hexadecimal Object Name Example Contents 0 00hex VendorName Vaisala 1 01hex ProductCode DMT143 2 02hex MajorMinorVersion Software version for example 1 4 2 3 03hex VendorUrl ht...

Страница 83: ...s 03hex Function Read Holding Registers 00hex Register address 04hex Number of data bytes 06hex F5hex Value of first register least significant word 00hex Number of 16 bit registers to read 2 96hex 02...

Страница 84: ...ence for 3 5 bytes End of Modbus RTU frame 3Ehex Value for the second register most significant word The response to a write function informs that the function was correctly received by the device It...

Страница 85: ...Appendix A Modbus Reference 83...

Страница 86: ...DMT143 User Guide M211435EN J 84...

Страница 87: ...of Sale for details of the warranty for each product Technical Support Contact Vaisala technical support at helpdesk vaisala com Provide at least the following supporting information Product name mod...

Страница 88: ...DMT143 User Guide M211435EN J 86...

Страница 89: ......

Страница 90: ...www vaisala com...

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