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Summary of Contents for Vaisala Drycap DMT152
- Page 1 USER'S GUIDE ® Vaisala DRYCAP Dewpoint Transmitter DMT152 M210865EN-D...
- Page 2 The contents are subject to change without prior notice. Please observe that this manual does not create any legally binding obligations for Vaisala towards the customer or end user. All legally binding commitments and agreements are included exclusively in the applicable supply contract or Conditions of...
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Page 3: Table Of Contents
Pressure................. 21 Leak tightness and materials ......... 21 Flow................22 Sampling Cell Types .............. 22 DMT242SC Sampling Cell ..........22 DMT242SC2 Sampling Cell with Swagelok Connectors ..22 DSC74 Sampling Cell with Quick Connector and Leak Screw................23 VAISALA ________________________________________________________________________ 1... - Page 4 User's Guide ______________________________________________________________________ DSC74B Two Pressure Sampling Cell ........24 DSC74C Two-Pressure Sampling Cell with Coil....26 CHAPTER 5 OPERATION....................29 Serial Communication............29 Connecting to the Serial Interface ........29 Installing the Driver for the USB Cable ......29 Terminal Application Settings..........30 List of Serial Commands ............32 Device Information and Status..........33 Show Device Information ............33 Show Transmitter Status .............34...
- Page 5 Field Check using DM70 ............. 55 Troubleshooting ..............57 Error State ................58 Error Codes ................. 59 Unknown Serial Settings ............. 60 Technical Support ..............60 Vaisala Service Centers............61 CHAPTER 7 TECHNICAL DATA ..................63 Measured Variables..............63 Operating Environment ............63 Outputs..................64 General ..................
- Page 6 User's Guide ______________________________________________________________________ List of Figures Figure 1 Dewpoint Transmitter DMT152..........11 Figure 2 DMT152 Installed Directly to Pipeline ........16 Figure 3 Removing the Transport Protection Cap ........16 Figure 4 Installing the Transmitter ............17 Figure 5 Connecting the Cable ...............17 Figure 6 Connectors I and II ..............18 Figure 7 Connector Pinout..............19...
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Page 7: Chapter 1 General Information
- Chapter 5, Operation, contains the operating instructions and serial line commands for the Dewpoint Transmitter DMT152. - Chapter 6, Maintenance, provides information on the maintenance of Dewpoint Transmitter DMT152. - Chapter 7, Technical Data, provides the technical data of Dewpoint Transmitter DMT152. VAISALA ________________________________________________________________________ 5... -
Page 8: Version Information
Note highlights important information on using the product. NOTE Feedback Vaisala Customer Documentation Team welcomes your comments and suggestions on the quality and usefulness of this publication. If you find errors or have other suggestions for improvement, please indicate the chapter, section, and page number. You can send comments to us by e-mail: manuals@vaisala.com... -
Page 9: Product Related Safety Precautions
Dispose of batteries and the unit according to statutory regulations. Do not dispose of with regular household refuse. Regulatory Compliances Vaisala DRYCAP® Dewpoint Transmitter DMT152 is in conformity with the following EU directives, including the latest amendments, and with national legislation implementing these directives:... -
Page 10: Warranty
Products should Vaisala so require, be sent to the works supplied hereunder, which obligations of Vaisala or to such other place as Vaisala may liabilities are hereby expressly cancelled and indicate in writing, freight and insurance waived. Vaisala's liability... -
Page 11: Chapter 2 Product Overview
-100 … +20 °C (-148 … +68 °F). If the primary dewpoint measurement range of the application is above -30 °C (-22 °F), other Vaisala transmitters may be more suitable. The DMT152 is designed for a wide range of OEM applications. The... -
Page 12: Basic Features And Options
4 ... 20 mA and 0 … 5 V / 0 … 10 V - Configurable alarm modes for analog outputs - Digital output: RS-485 - Serial line connection also via USB serial interface cable (Vaisala order code 219690) - Simultaneous use of analog and digital output possible... -
Page 13: Figure 1 Dewpoint Transmitter Dmt152
Three copper sealing rings are provided with the transmitter, and more can be ordered from Vaisala. Note that the sealing rings for ISO and UNF threads are different. See section Spare Parts and Accessories on page 65. - Page 14 User's Guide ______________________________________________________________________ This page intentionally left blank. 12 __________________________________________________________________ M210865EN-D...
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Page 15: Functional Description
During auto-calibration the sensor is warmed for a short period (< 1 min) and the sensor capacitance values are evaluated at the elevated temperature. The possible dry end drift is then corrected to correspond to the calibrated values. During the auto-calibration the VAISALA _______________________________________________________________________ 13... -
Page 16: Sensor Purge
User's Guide ______________________________________________________________________ transmitter outputs the T value that was measured prior to the procedure. When the auto-calibration is done, normal measurement and output is resumed. Auto-calibration is carried out only if several criteria for the measurement environment are fulfilled. This ensures the reliability of the adjustments, and maintains the excellent long term stability that the patented technology offers. -
Page 17: Chapter 4 Installation
Sampling from the process is easy by using Vaisala sampling cell options; see section Sampling from a Process on page 21. The DMT152 is light in weight which means that it can be installed in a sample pipeline in the sampling cells without the need of any additional mechanical support. -
Page 18: Installing The Transmitter
User's Guide ______________________________________________________________________ Max 50 bar 0710-101 Figure 2 DMT152 Installed Directly to Pipeline Installing the Transmitter After selecting a suitable measurement location, follow the procedure below to install the transmitter: Remove the yellow transport protection cap from the transmitter. Do not touch the filter with your hands. 0710-128 Figure 3 Removing the Transport Protection Cap... -
Page 19: Figure 4 Installing The Transmitter
Connect the wires of the connection cable. When using cables provided with DMT152 refer to the wiring section on page 18. See the power supply requirements on page 20. 0710-130 Figure 5 Connecting the Cable VAISALA _______________________________________________________________________ 17... -
Page 20: Wiring
User's Guide ______________________________________________________________________ Plug in the cable to the transmitter. Be sure to use the correct connector; refer to section Wiring on page 18. Cover the unused connector on the transmitter with the rubber plug that is attached to the transmitter. Turn on the power supply. -
Page 21: Connection Cables
- Shielded cables with M8 female straight threaded connector - USB serial interface cable For the order codes of the cables, refer to section Spare Parts and Accessories on page 65. NOTE Avoid using long cables (over 2m) with voltage output. VAISALA _______________________________________________________________________ 19... -
Page 22: Power Supply Requirements
User's Guide ______________________________________________________________________ 0510-036 Figure 8 Cable with Snap-On Connector 0510-037 Figure 9 Cable with Threaded Connector Power Supply Requirements The DMT152 transmitters are designed to operate with a supply voltage of 15 ... 28 VDC (voltage output version) or 21 ... 28 VDC (current output version). -
Page 23: Sampling From A Process
You can use the Vaisala Humidity Calculator to simulate the effect of pressure change to dewpoint. The Humidity Calculator can be found http://www.vaisala.com/humiditycalculator... -
Page 24: Flow
® To fit 6 mm tubing to the connectors, an adapter such as Swagelok Reducer SS-6M0-R-4 (not supplied by Vaisala) can be used. DMT242SC2 is the suitable choice in e.g. plastics drying systems, where the measurement is made by tapping off the dryer system and bringing a small air stream to the sensor. -
Page 25: Dsc74 Sampling Cell With Quick Connector And Leak Screw
(suitable for type D, Quick08, NIP08). This allows for easy installation and detachment of the dewpoint transmitter without having to shut down the process. Alternative ways to connect are through the two different thread VAISALA _______________________________________________________________________ 23... -
Page 26: Dsc74B Two Pressure Sampling Cell
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). 24 __________________________________________________________________ M210865EN-D... -
Page 27: Figure 12 Dsc74B
- 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" 0510-032 Figure 12 DSC74B where Gas goes in Gas comes out 0510-033 Figure 13 Removing the Leak Screw VAISALA _______________________________________________________________________ 25... -
Page 28: Dsc74C Two-Pressure Sampling Cell With Coil
User's Guide ______________________________________________________________________ DSC74C Two-Pressure Sampling Cell with Coil The DSC74C with an outlet coil is designed for the most critical measurements at atmospheric pressure. In the DSC74C the coil is connected to the sampling cell outlet to protect the sensor from ambient humidity disturbing the measurement. -
Page 29: Figure 15 Alternative Assembly Of Dsc74C (For Tight Spaces)
Alternative Assembly of DSC74C (for Tight Spaces) where Gas comes out Coil Thread, max. size 7 mm Gas goes in Valve The thread size cannot exceed 7 mm. Use the provided adapter to avoid damage to the probe. VAISALA _______________________________________________________________________ 27... - Page 30 User's Guide ______________________________________________________________________ This page intentionally left blank. 28 __________________________________________________________________ M210865EN-D...
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Page 31: Chapter 5 Operation
The DMT152 can be connected to a PC using the RS-485 line on Port II. You can use, for example, the USB serial interface cable (Vaisala order code 219690). The cable also provides operation power to the transmitter from the USB port. It is OK to connect the USB serial interface cable even if the transmitter is already supplied with operation power from another cable. -
Page 32: Terminal Application Settings
There is no reason to uninstall the driver for normal use. However, if you wish to remove the driver files and all Vaisala USB cable devices, you can do so by uninstalling the entry for Vaisala USB Instrument Driver from the Add or Remove Programs (Programs and Features in Windows Vista) in the Windows Control Panel. -
Page 33: Figure 16 Putty Terminal Application
COM port is selected in the Serial line to connect to field. Note: You can check which port the USB cable is using with the Vaisala USB Instrument Finder program that has been installed in the Windows Start menu. Check that the other serial settings are correct for your connection, and change if necessary. -
Page 34: List Of Serial Commands
User's Guide ______________________________________________________________________ List of Serial Commands All commands can be issued either in uppercase or lowercase. The notation <cr> refers to pressing the carriage return (Enter) key on your computer keyboard. Enter a <cr> to clear the command buffer before starting to enter commands. -
Page 35: Device Information And Status
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 the serial interface modes, see section Set Serial Interface Mode on page 42. ??<cr> VAISALA _______________________________________________________________________ 33... -
Page 36: Show Transmitter Status
User's Guide ______________________________________________________________________ Show Transmitter Status The STAT command displays the status of the transmitter in four characters. STAT<cr> The status codes are as follows: 0000 Normal measurement 1000 Sensor purge 1010 Settling period after sensor purge 1100 Auto-calibration after sensor purge 1110 Settling period after purge + auto-calibration 0100 Auto-calibration (e.g. -
Page 37: Configuring Analog Outputs
ON/OFF output mode. See section Malfunction Alarm on page 38. When the transmitter is ordered from Vaisala, the modes are configured as specified in the order form. You can change the operation settings after delivery using the AMODE command: AMODE [c1 c2]<cr>... -
Page 38: Limit Alarm
User's Guide ______________________________________________________________________ Limit Alarm The limit alarm is activated when the measured quantity goes below the low limit, or above the high limit. The alarm can be specified during ordering for a specified parameter, or configured on the serial line using the ALARM command. -
Page 39: Self-Diagnostic Alarm
Level Hi 0.00 > Level Lo and Level Hi are shared between the STATUS and ALARM commands. For example, if you change the levels using the alarm command, it will also change when viewing the status command. VAISALA _______________________________________________________________________ 37... -
Page 40: Malfunction Alarm
User's Guide ______________________________________________________________________ Malfunction Alarm If the transmitter 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: AERR<cr> Example: >aerr Ch1 error out 20.000 mA ? -
Page 41: Configuring Serial Line Operation
With the SDELAY command you can set delay (response time) of the serial line, or view the currently set delay value. Increasing the value by one increases the delay by 4 milliseconds. For example, value of 5 equals ~20 ms answer delay. VAISALA _______________________________________________________________________ 39... -
Page 42: Set Transmitter Address
User's Guide ______________________________________________________________________ SDELAY [x]<cr> Where = Serial line delay (0 … 255) Example: >sdelay 1 Serial delay > Set Transmitter Address To operate in the POLL mode, the transmitter must have an address. If multiple transmitters share the same serial line, each transmitter must have a different address. -
Page 43: Table 6 Form Command Quantities
Shows the name of the measurement unit using “x” number of characters. For example, U3 shows the name of the measurement unit with three characters. Examples: >form 4.2 TDF #r #n > >form 3.1 “H2O= “ ppm “ “ U3 #r #n > VAISALA _______________________________________________________________________ 41... -
Page 44: Select Unit
User's Guide ______________________________________________________________________ Select Unit The DMT152 Transmitter outputs dewpoint temperature T in either Celsius or Fahrenheit degrees depending on the unit selection. The unit selection also affects the unit (bar or psi ) for the pressure compensation. UNIT [x]<cr> where Selects the unit type to output: m = metric units, e.g. -
Page 45: Configuring Measurement Parameters
PRES [pp.pppp]<cr> XPRES [pp.pppp]<cr> where pp.pppp Absolute pressure in the measuring point. The unit is if metric units have been selected, and psi non-metric units are used. VAISALA _______________________________________________________________________ 43... -
Page 46: Table 8 Pressure Conversion Coefficients
User's Guide ______________________________________________________________________ Command XPRES should be used if the value is changed frequently. The value set using the XPRES command overrides the PRES value, but it is not retained at reset. When the XPRES is set to 0, the last value set with PRES is used instead. -
Page 47: Set Molar Mass For Ppmw Calculation
Start Measurement Output Use the R command to start the continuous outputting of measurement values as an ASCII text string to the serial line. The format of the measurement message is set with the FORM command. R<cr> VAISALA _______________________________________________________________________ 45... -
Page 48: Stop Measurement Output
User's Guide ______________________________________________________________________ Example (measurement message in default format): >r Tdf= -2.5 'C H2O= 4919 ppm Tdf= -2.5 'C H2O= 4918 ppm Tdf= -2.5 'C H2O= 4917 ppm … Outputting the results continues in intervals issued with the command INTV. You can stop the output by pressing the esc key, or with the command S. -
Page 49: Output A Reading Once
Before testing, you can verify the currently set analog output modes using the AMODE command. After testing the output, give the ATEST command again to exit the test mode. VAISALA _______________________________________________________________________ 47... -
Page 50: Calibrate Analog Output
Channel 1 output value (V or mA) Channel 2 output value (V or mA) The output shows the test values of the analog channels, and diagnostic information that may be useful to Vaisala Service if there is a problem with the analog outputs. Example: >atest 1 15... -
Page 51: Extend Analog Output Range
Opening the Transmitter in POLL Mode Use the OPEN command to connect to a transmitter that is in POLL mode. OPEN [aa]<cr> where address (0 ... 99) Resulting (only in POLL-state): >open 1 DMT152 1 line opened for operator commands > VAISALA _______________________________________________________________________ 49... -
Page 52: Closing The Connection To A Transmitter In Poll Mode
User's Guide ______________________________________________________________________ Closing the Connection to a Transmitter in POLL Mode The CLOSE command closes the connection to a transmitter. CLOSE<cr> Example: >close line closed > Display Command List HELP<cr> Set Time Use the TIME command to view and set the transmitter clock. The clock does not have a battery backup –... -
Page 53: Reset Transmitter
As the transmitter starts up, it performs the startup sensor purge and auto-calibration before resuming measurement. RESET<cr> Restore Factory Settings Use the FRESTORE command to restore the factory settings to the transmitter. All user settings will be lost. FRESTORE<cr> VAISALA _______________________________________________________________________ 51... - Page 54 User's Guide ______________________________________________________________________ This page intentionally left blank. 52 __________________________________________________________________ M210865EN-D...
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Page 55: Chapter 6 Maintenance
Changing the Filter If the filter is contaminated, it should be replaced. New filters can be ordered from Vaisala, with the order code 220957. Be careful when changing the filter, since it is easy to break the sensor when the filter is removed. -
Page 56: Figure 17 Filter Structure
(ISO and UNF threads only). 0711-195 Figure 17 Filter Structure where ® Vaisala DRYCAP sensor Spring washer Stainless steel mesh filter (do not touch) Top of the filter Replace the filter as follows: Grip the old filter from the top of the filter body using an 11 mm socket wrench. -
Page 57: Calibration And Adjustment
For more information, see section Field Check using DM70 on page 55. If there is need for calibration or adjustment, contact a Vaisala Service Center or your local Vaisala representative. See contact information on page 61. -
Page 58: Figure 18 Supply Voltage Too Low For Ma Output Error
User's Guide ______________________________________________________________________ Perform the check as follows: Place the DMT152 in the reference environment (unless it is already). You can perform the check even if the DMT152 is currently being powered and used, as long as there is no cable connected to Port II. -
Page 59: Troubleshooting
Also remember that the start up of the transmitter may take up to 15 minutes. Some problems can be solved by simply resetting the transmitter. You can reset the transmitter by disconnecting the power or issuing the RESET command on the serial line. VAISALA _______________________________________________________________________ 57... -
Page 60: Error State
User's Guide ______________________________________________________________________ If you cannot locate the source of the error and return the transmitter to the normal state, please contact a Vaisala Service Center or your local Vaisala representative. See sections Error Codes on page 59 and Vaisala Service Centers on page 61... -
Page 61: Error Codes
Ambient temperature out of operating range (probably too hot). Flash check sum error Internal error Param check sum error Internal error INFOA check sum error Internal error SCOEFS check sum error Internal error CURRENT check sum error Internal error VAISALA _______________________________________________________________________ 59... -
Page 62: Unknown Serial Settings
If necessary, set new serial line settings using the SERI command. For instructions on using the command, see page 39. Technical Support For technical questions, contact the Vaisala technical support: E-mail helpdesk@vaisala.com +358 9 8949 2790... -
Page 63: Vaisala Service Centers
Chapter 6 ______________________________________________________________ Maintenance Vaisala Service Centers Send the device to Vaisala Instruments Service Centre for calibration and adjustment, see contact information below. Remember to attach the yellow transport protection cap to the transmitter to protect it (and keep it dry) during transit. - Page 64 User's Guide ______________________________________________________________________ This page intentionally left blank. 62 __________________________________________________________________ M210865EN-D...
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Page 65: Chapter 7 Technical Data
-40 … +60 °C (-40 … +140 °F) Relative humidity 0 … 100 %RH (up to +20 °C / +68 °F) Pressure 0 … 50 bar (725 psia) Measured gases non-corrosive gases Sample flow rate no effect on measurement accuracy VAISALA _______________________________________________________________________ 63... -
Page 66: Outputs
5 V, 10 V or 20 mA OR exceeded T or ppm limit user selectable General ® Sensor Vaisala DRYCAP 180U Thin-film capacitive polymer sensor Startup time 10 .. 15 minutes Recommended calibration interval 2 years Operating voltage with RS485 output 11* …... -
Page 67: Output Cable Specifications
Sampling cells (available only for ISO G1/2”) Sampling cell DMT242SC Sampling cell with 1/4" male Swagelok connectors DMT242SC2 Sampling cell with quick connector and leak screw DSC74 Two-pressure sampling cell DSC74B Separate cooling/venting coil for sampling cells DMCOIL VAISALA _______________________________________________________________________ 65... -
Page 68: Dimensions In Mm (Inches)
User's Guide ______________________________________________________________________ Dimensions in mm (inches) 0710-133 Figure 19 DMT152 Dimensions 66 __________________________________________________________________ M210865EN-D... - Page 69 www.vaisala.com...