USER'S GUIDE Vaisala Dewpoint and Pressure Transmitter DPT146 for Compressed Air M211372EN-D
PUBLISHED BY Vaisala Oyj Street address: Mailing address: Phone: Fax: Vanha Nurmijärventie 21, FI-01670 Vantaa, Finland P.O. Box 26, FI-00421 Helsinki, Finland +358 9 8949 1 +358 9 8949 2227 Visit our Internet pages at www.vaisala.com.
_________________________________________________________________________________ Table of Contents CHAPTER 1 GENERAL INFORMATION ............................................................................ 7 About This Manual ................................................................... 7 Contents of This Manual ....................................................... 7 Version Information ............................................................... 8 Related Manuals .............................
User's Guide _______________________________________________________________________ Sampling Accessories ........................................................... 25 DMT242SC Sampling Cell .................................................. 25 DMT242SC2 Sampling Cell with Swagelok Connectors ..... 25 DSC74 Sampling Cell with Quick Connector and Leak Screw ................................................................................... 26 DSC74B Two-Pressure Sampling Cell ...............................
_________________________________________________________________________________ CHAPTER 6 MAINTENANCE ........................................................................................... 53 Periodic Maintenance ............................................................ 53 Cleaning .............................................................................. 53 Changing the Filter .............................................................. 53 Calibration and Adjustment .......................
User's Guide _______________________________________________________________________ List of Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Figure 18 Figure 19 Figure 20 Figure 21 Figure 22 Figure 23 Figure 24 Figure 25 DPT146 with ISO G1/2” Thread ............................................... 13 DPT146 Transmitter Structure..................................................
_________________________________________________________________________________ List of Tables Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table 9 Table 10 Table 11 Table 12 Table 13 Table 14 Table 15 Table 16 Table 17 Table 18 Table 19 Table 20 Table 21 Table 22 Table 23 Manual Revisions ....................................................................... 8 Related Manuals ........................................................................ 8 Output Parameters of DPT146 .....
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Chapter 1 _________________________________________________________ General Information CHAPTER 1 GENERAL INFORMATION This chapter provides general notes for the manual and the DPT146. About This Manual This manual provides information for installing, operating, and maintaining Vaisala Dewpoint and Pressure Transmitter DPT146 for Compressed Air. Contents of This Manual This manual consists of the following chapters: - Chapter 1, General Information, provides general notes for the manual and the DPT146.
User's Guide _______________________________________________________________________ Version Information Table 1 Manual Code M211372EN-D M211372EN-C Manual Revisions Description This manual. Added a minimum baud rate requirement when using the Modbus protocol. Added a packing recommendation for return shipment. Previous version.
Chapter 1 _________________________________________________________ General Information Safety The DTP146 delivered to you has been tested for safety and approved as shipped from the factory. Note the following precautions: WARNING Ground the product and verify outdoor installation grounding periodically to minimize shock hazard. CAUTION Do not modify the unit. Improper modification can damage the product or lead to malfunction.
User's Guide _______________________________________________________________________ Recycling Recycle all applicable material. Dispose of the unit according to statutory regulations. Do not dispose of with regular household refuse.
Chapter 1 _________________________________________________________ General Information Software License This product contains software developed by Vaisala. Use of the software is governed by license terms and conditions included in the applicable supply contract or, in the absence of separate license terms and conditions, by the General License Conditions of Vaisala Group. Warranty Visit our Internet pages for standard warranty terms and conditions: www.vaisala.com/warranty.
User's Guide _______________________________________________________________________ CHAPTER 2 PRODUCT OVERVIEW This chapter introduces the features, advantages, and product options. Introduction to DPT146 Vaisala Dewpoint and Pressure Transmitter DPT146 for Compressed Air combines online measurement of dewpoint and pressure. The dewpoint measurement is continuously pressure compensated using the measured pressure.
Chapter 2 ___________________________________________________________ Product Overview - Easy verification of dewpoint measurement with the Vaisala DRYCAP® Hand-Held Dewpoint Meter DM70. - Optional accessories: - USB service cable for configuration and calibration. - Loop-powered display. - Various sampling cells with different installation options.
User's Guide _______________________________________________________________________ Transmitter Structure The structure of the DPT146 is shown in Figure 2 below. The transmitter body does not have user serviceable parts inside, and is not designed to be opened. Opening the transmitter will void the warranty.
Chapter 2 ___________________________________________________________ Product Overview Connection Cables Vaisala supplies shielded cables with M8 female straight threaded connector. Available in four lengths: - 0.3 m (1.0 ft) 3 m (9.8 ft) 5 m (16.4 ft) 10 m (32.8 ft) Also available are cables for service port and field check use: - USB service cable - MI70 connection cable For the order codes of the cables, refer to section Spare Parts and Accessories on page 64.
User's Guide _______________________________________________________________________ Loop-Powered Display (Optional) DPT146 with 4 ... 20 mA current output can be connected to a looppowered external LED display (type Nokeval 301, Vaisala order code 226476). The display provides a reading of one output parameter. The display is powered by the current signal, so there is no need for an external power supply. The display is delivered at its default settings.
Chapter 3 _______________________________________________________ Functional Description CHAPTER 3 FUNCTIONAL DESCRIPTION This chapter describes the functionality of the DPT146. Sensor Technology MPS1 Multiparameter Sensor DPT146 combines Vaisala’s proven DRYCAP® sensor technology for industrial dewpoint measurement with BAROCAP® pressure sensor technology. Both technologies are integrated on the same MPS1 multiparameter sensor element, allowing for a highly compact and versatile transmitter.
User's Guide _______________________________________________________________________ DRYCAP® Technology Vaisala DRYCAP® dewpoint measurement technology ensures accurate measurement with excellent long term stability. This results in very low maintenance requirements for the transmitter. The lasting performance is achieved with microprocessor technology and software that automatically performs self-diagnostic functions in addition to the normal dewpoint measurement.
Chapter 3 _______________________________________________________ Functional Description advantage of sensor warming is the rapid response of dewpoint measurement. A wet sensor and filter would otherwise result in a dewpoint equal to ambient temperature (that is RH = 100 %). If in spite of sensor warming the sensor gets soaked, it will recover fully back to normal operation after it dries out. NOTE Sensor warming is not available if the transmitter has been ordered with RS-485 only output.
User's Guide _______________________________________________________________________ DPT146 Startup Sequence When the transmitter is powered up, it will perform the sequence shown in Figure 7 below. After a five-second startup, the transmitter will measure normally for five minutes, after which it will perform the sensor purge and auto-calibration functions. This can take up to six minutes, during which time the output is frozen: it will display the last measured values before the sensor purge began.
Chapter 4 ________________________________________________________________ Installation CHAPTER 4 INSTALLATION This chapter provides you with information that is intended to help you install the DPT146. Transmitter Configuration Before Installation You may wish to configure your transmitter before physically installing it. For easy access to the serial line, use the USB service cable and a terminal program on a PC.
User's Guide _______________________________________________________________________ measurement point should be within 1 ... 10 bar (14.5 ... 145 psi). The maximum pressure tolerance of the transmitter is 50 bar (725 psi). If the gas temperature is higher than the specified maximum operating temperature of the transmitter, gas sampling and cooling it to ambient temperature (for example, 20 °C / 68 °F) is recommended.
Chapter 4 ________________________________________________________________ Installation 1109-032 Figure 9 Installing the Transmitter 1109-033 Figure 10 3. CAUTION Tightening with a Wrench Tighten the connection by turning with a wrench (max. 50 Nm). Only tighten the transmitter from the 30 mm nut. Do NOT apply force to other points in the transmitter body. 4. Continue with the wiring of the transmitter. See section Wiring on page 24.
User's Guide _______________________________________________________________________ Wiring CAUTION The power 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 cable or DM70 handheld dewpoint meter (which also provide power) is OK.
Chapter 4 ________________________________________________________________ Installation Sampling from a Process Sampling is needed when direct 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 instrument from a pressurized process without running the whole process down, or wanting to make the measurement at a more convenient location.
User's Guide _______________________________________________________________________ 0801-069 Figure 13 Sampling Cells DMT242SC2 (left) and DMT242SC (right) where 1 2 3 4 = = = = Male pipe welded connector Swagelok 1/4" G1/2" G1/4" G3/8" DSC74 Sampling Cell with Quick Connector and Leak Screw DSC74 has been designed especially for compressed air lines. The sampling cell contains an adjustable leak screw that allows keeping up the pipeline pressure at the sensor.
Chapter 4 ________________________________________________________________ Installation When using DSC74, seal the threads of the quick connector or thread adapter carefully with PTFE thread seal tape. Tighten with an open-end wrench.
User's Guide _______________________________________________________________________ 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.
Chapter 4 ________________________________________________________________ Installation DSC74C Two-Pressure Sampling Cell with Coil 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. The coil can also be used as a cooling coil for sampling from high temperature processes.
User's Guide _______________________________________________________________________ 0403-113 Figure 18 Alternative Assembly of DSC74C (for Tight Spaces) where 1 2 3 4 5 = = = = = 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 transmitter.
Chapter 4 ________________________________________________________________ Installation DM240FA Duct Installation Flange The transmitter can be installed directly in the measured gas through DM240FA duct installation flange. When the transmitter is installed directly on the process wall or pipe, note that a closing valve may be needed on both sides of the installed transmitter so that the transmitter can be removed from the process for calibration or maintenance.
User's Guide _______________________________________________________________________ CHAPTER 5 OPERATION This chapter contains information that is needed to operate the DPT146. Transmitter Start-Up When the transmitter is connected to power supply, there is a delay of five seconds as the transmitter starts up. After the start-up is complete, the measurement data is available from the analog outputs or serial line.
Chapter 5 _________________________________________________________________ Operation Serial Communication Connecting to the Serial Interface DPT146 can be connected to a PC using the RS-485 line on Port II. It is recommended that you use the USB service cable (Vaisala order code 219690) for the connection, since the cable also provides the operating power from the USB port. If you have not used the USB service cable before, install the driver that came with the cable.
User's Guide _______________________________________________________________________ Terminal Application Settings The serial interface settings of the DPT146 RS-485 line are presented in Table 5 below. Table 5 Property Baud rate Parity Data bits Stop bits Flow control Default Serial Interface Settings Description / Value 19200 None 8 1 None The steps below describe how to connect to the DPT146 using the PuTTY terminal application for Windows (available for download at www.vaisala.
Chapter 5 _________________________________________________________________ Operation 0807-004 Figure 20 PuTTY Terminal Application VAISALA ________________________________________________________________________ 35
User's Guide _______________________________________________________________________ List of Serial Commands All commands can be issued either in uppercase or lowercase. In the command examples, the keyboard input by the user is in bold type. The notation refers to pressing the carriage return (Enter) key on your computer keyboard. Enter a to clear the command buffer before starting to enter commands.
Chapter 5 _________________________________________________________________ Operation Device Information Show Device Information The ? command outputs a listing of device information. ? Command ?? is a similar command that is designed to be used if the transmitter is in POLL mode but its address is unknown. The transmitter will respond to the ?? command even while in POLL mode. Do not use the ?? command if you have more than one transmitter on an RS-485 line. Example: ? DPT146 1.0.
User's Guide _______________________________________________________________________ Show Currently Active Errors Use the ERRS command to display the currently active transmitter error messages. Possible errors and their causes are listed in Table 12 on page 59.
Chapter 5 _________________________________________________________________ Operation Show Firmware Version VERS Example: vers DPT146 1.0.23 Show Serial Number SNUM Example: snum Serial number : F4040027 Configuring Analog Output Set Analog Output Mode Use the AMODE command to change the analog output mode: AMODE [c1 c2] where c1 = Channel 1 analog output mode. Available options are: 1 = 0 ... 20 mA 2 = 4 ... 20 mA 4 = 0 ... 5 V 5 = 0 ... 10 V c2 = Channel 2 analog output mode.
User's Guide _______________________________________________________________________ Set Analog Output Parameters and Scaling Use the ASEL command to show or set the output parameters and the scalings of the analog output. ASEL [ch1] [ch2] where ch1 = Parameter that is output on analog channel 1. Available parameters are TDF, TDFA, H2O, and P. ch2 = Parameter that is output on analog channel 2. Available parameters the same as for channel 1.
Chapter 5 _________________________________________________________________ Operation Example (set channel 1 error level to 20 mA, channel 2 to 10 V): aerr 20 10 Ch1 error out Ch2 error out NOTE : : 20.000 mA 10.000 V The error output value is displayed only when there are minor electrical faults such as a sensor damage. When there is a severe device malfunction, the error output value is not necessarily shown.
User's Guide _______________________________________________________________________ Test Analog Output The operation of the analog outputs can be tested with the ATEST command by forcing the outputs to given values which can then be measured with a calibrated multimeter. After testing the outputs, give the ATEST command again to exit the test mode. ATEST [ch1] [ch2] where ch1 = ch2 = Analog output value for channel 1. Analog output value for channel 2.
Chapter 5 _________________________________________________________________ Operation 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. Since the interface is half-duplex, you must enter the commands when the transmitter is not outputting.
User's Guide _______________________________________________________________________ Output a Reading Once Use the SEND command to output a single measurement message. The output message is sent in the format that has been set using the FORM command. SEND [address] where address = Address of the transmitter, range 0 ... 255. Specifying the address is only necessary if the target transmitter is in POLL mode, and has not been accessed with the OPEN command. Example: send Tdf= 12.5 'C P= Tdfatm= 13.
Chapter 5 _________________________________________________________________ Operation Configuring Measurement Parameters Set Measurement Output Format Use the serial line command FORM to change the measurement message sent by the transmitter. You can freely define the output message to include the desired parameters, formatting options, text strings, and additional fields. FORM [modifier string] where modifier string = String of parameters and modifiers that defines the output format, length 1 ...
User's Guide _______________________________________________________________________ Table 7 FORM Command Parameters Measured Parameter Dewpoint/frost point temperature Dewpoint/frost point temperature, converted to atmospheric pressure ppm moisture, by volume Pressure, absolute Temperature Table 8 Modifier x.
Chapter 5 _________________________________________________________________ Operation Select Unit Use the UNIT command to select metric or non-metric output units. UNIT [x] where x = Selects the unit type to output: m = metric units, for example, Celsius n = nonmetric units, for example, Fahrenheit Example: unit m Units : Metric Configuring Serial Line Operation Set Serial Line Operating Mode Use the SMODE command to set the start-up operating mode of the serial line.
User's Guide _______________________________________________________________________ Selected output mode will be activated at next reset or power up. Example: smode poll Serial mode : POLL Set Serial Line Settings Use the SERI command to set the serial line settings. The new settings will be taken into use when the transmitter is reset or powered up. Note that changing the serial line settings will slightly alter how the transmitter works with the MI70 indicator.
Chapter 5 _________________________________________________________________ Operation Example: addr Address : 0 ? Set Serial Line Response Time 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, the default value is 10 which equals a ~40 ms answer delay. SDELAY [delay] where delay = Serial line delay, range 0 … 255.
User's Guide _______________________________________________________________________ Closing the Connection to a Transmitter in POLL Mode The CLOSE command closes the connection to a transmitter. CLOSE Example: close line closed Show Transmitter Uptime Use the TIME command to show how long the transmitter has been operating since it was last reset or powered up. TIME Example: time Time : 03:14:10 Reset Transmitter Use the RESET command to reset the transmitter.
Chapter 5 _________________________________________________________________ Operation Modbus Communication Addressing with Modbus Protocol The Modbus variant used in DPT146 communication is Modbus RTU. An example of Modbus addressing is shown below. Request: 0x01 0x03 0x00 0x04 addr. func. reg. 5 Response: 0x01 0x03 0x04 0xBC 0xC0 0x41 0xC2 0x6E 0x5E addr. func. len. reg. 5 reg.
User's Guide _______________________________________________________________________ Configuration Commands Related to Modbus In addition to enabling the Modbus protocol in the device, Modbus over RS-485 needs the following software settings: serial bit rate, parity, number of stop bits, and Modbus device address.Use the service commands listed in Table 10 below to configure the Modbus RTU using the USB service cable.
Chapter 6 _______________________________________________________________ Maintenance CHAPTER 6 MAINTENANCE This chapter provides information that is needed in basic maintenance of the DPT146. Periodic Maintenance Cleaning The body of the transmitter can be cleaned by wiping with a moistened lint-free cloth. Do not immerse the transmitter in liquid, and do not use cleaning agents or solvents. Changing the Filter Replace the filter if it is contaminated.
User's Guide _______________________________________________________________________ 1109-001 Figure 21 Opening the Filter 1109-002 Figure 22 Filter Structure where 1 2 3 = = = Sealing ring (use with UNF and ISO threads only) MPS1 multiparameter sensor Stainless steel mesh filter (turn from top of the filter) Replace the filter as follows: 1. 2. 3. 4. Grip the old filter from the top of the filter body using an 11 mm socket wrench. Turn the filter counterclockwise until it is loose.
Chapter 6 _______________________________________________________________ Maintenance Calibration and Adjustment DPT146 is fully calibrated as shipped from factory. The recommended calibration interval is two years. If there is a reason to believe that the device is not within the accuracy specifications, you can perform a field check using the DM70 hand-held dewpoint meter, or an MI70 indicator with another DPT146.
User's Guide _______________________________________________________________________ 5. Disable the Auto power off function of the MI70 indicator to prevent the indicator from powering off in the middle of the check. Check the setting in the Settings - User Interface menu, and change if necessary. 6. The MI70 can display three parameters at one time. To compare the readings of the DPT146 and the reference probe, select the desired parameter from the Display – Quantities and Units menu of the MI70.
Chapter 6 _______________________________________________________________ Maintenance Repair Maintenance There are no user serviceable parts inside the transmitter. If there is a problem with your transmitter that you are unable to solve yourself or with the help of the Vaisala Helpdesk, contact a Vaisala Service Center to have the transmitter repaired. For troubleshooting instructions and Vaisala contact information, see Chapter 7, Troubleshooting, on page 58.
User's Guide _______________________________________________________________________ CHAPTER 7 TROUBLESHOOTING This chapter describes common problems, their probable causes and remedies, and provides contact information for technical support. Solving Typical Problems Some problems can be solved by simply resetting the transmitter. You can reset the transmitter by disconnecting the power or issuing the RESET command using the service port.
Chapter 7 ____________________________________________________________ Troubleshooting Error Messages The transmitter has error codes that can be displayed on the serial line using the ERRS command. See section Show Currently Active Errors on page 38.
User's Guide _______________________________________________________________________ Technical Support For technical questions, contact the Vaisala technical support by e-mail at helpdesk@vaisala.com. Provide at least the following supporting information: - Name and model of the product in question Serial number of the product Name and location of the installation site Name and contact information of a technically competent person who can provide further information on the problem.
Chapter 8 _____________________________________________________________ Technical Data CHAPTER 8 TECHNICAL DATA This chapter provides the technical data of the DPT146. Specifications Table 13 Measured Parameters Parameter Dewpoint Pressure, absolute Temperature (RS-485 only) Table 14 Calculated Parameters Parameter ppm moisture, by volume Dewpoint, converted to atmospheric pressure Table 15 Measured Range -60 ... +30 °C (-76 ... +86 °F) 1 ... 12 bar (14.5 ... 174 psi) -40 ... +80 °C (-40 ...
User's Guide _______________________________________________________________________ 40 Dewpoint temperature (°C) 30 Not recommended for continuous measurement 20 10 0 -10 Accuracy ±2 °C Td -20 -30 -40 -50 -60 Accuracy not specified -70 -80 Dewpoint measurement low limit -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 Temperature of measured gas (°C) 1109-009 Figure 24 DPT146 Dewpoint Measurement Accuracy Table 16 Operating Environment Property Operating temperature of electronics Descr
Chapter 8 _____________________________________________________________ Technical Data Table 18 General Property Sensor Operating voltage with current output with voltage output and when used in cold temperatures (-40 ... -20 °C (-40 ...
User's Guide _______________________________________________________________________ Spare Parts and Accessories Table 19 DPT146 Spare Parts and Accessories Description Connection cable for MI70 Indicator / DM70 Dewpoint Meter USB connection cable Mesh Filter 18um Stainless Steel Sealing ring set, 3 pcs for ISO1/2" thread Sealing ring set, 3 pcs for UNF 3/4" - 16 thread Protection plug for connector Loop-powered external display ISO 1/2" plug NPT 1/2" plug Basic sample cell Sample cell with Swagelok 1/4"
Chapter 8 _____________________________________________________________ Technical Data Dimensions in mm 32.5 Ø12 Ø29.5 76 120.5 G 1/2" ISO 228-1 32.5 Ø12 Ø29.5 76 120.5 3/4"-16 UNF 128.5 32.5 Ø12 Ø29.
User's Guide _______________________________________________________________________ APPENDIX A MODBUS REFERENCE This appendix describes the Modbus protocol implementation of the DPT146 transmitters. Default Communication Settings Table 20 below shows the default communication settings when Modbus is enabled at the factory.
Appendix A _________________________________________________________ Modbus Reference Modbus Register Map Table 22 Modbus Register Map Logical Address (decimal) 5 6 7 8 11 12 21 22 45 46 513 PDU Address (hexadecimal) Register Description 00 04 00 05 00 06 00 07 00 0A 00 0B 00 14 00 15 00 2C 00 2D 02 00 T (measured) 514 02 01 Online status 516 517 1283 02 03 02 04 05 02 Error code 1284 05 03 Start-up purge on/off* 1285 05 04 Purge in progress* 1537 06 00 Address Td/f (measured) T d/f (
User's Guide _______________________________________________________________________ Table 23 Object Id (decimal) Object Id (hexadecimal) 0 1 2 3 4 00 01 02 03 04 Device Identification Objects Object Name (as defined by the specification) VendorName ProductCode MajorMinorVersion VendorUrl ProductName 128 80 SerialNumber* 129 81 CalibrationDate* 130 82 CalibrationText* * Vaisala-specific device information object NOTE Example Vaisala DPT146 1.3.27 http://www.vaisala.
www.vaisala.
