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Vaisala DPT146, User Manual

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Vaisala DPT146 User Manual Download Page 53

Chapter 5 ________________________________________________________________ Operation 
 

VAISALA _______________________________________________________________________ 53 

Closing the Connection to a Transmitter 
in POLL Mode 

The 

CLOSE

 command closes the connection to a transmitter. 

CLOSE

<cr> 

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

<cr> 

Example: 

time 

Time           : 03:14:10 

Reset Transmitter 

Use the 

RESET

 command to reset the transmitter. 

RESET

<cr> 

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 transmitter will be set to the mode that was set using the 

SMODE

 command. 

Restore Factory Settings 

Use the 

FRESTORE

 command to restore the factory settings to the 

transmitter. All user settings will be lost. 

FRESTORE

<cr> 

Summary of Contents for DPT146

Page 1: ...USER S GUIDE Vaisala Dewpoint and Pressure Transmitter DPT146 for Compressed Air M211372EN B ...

Page 2: ...hanical including photocopying nor may its contents be communicated to a third party without prior written permission of the copyright holder 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 th...

Page 3: ...ademarks 11 License Agreement 11 Warranty 11 CHAPTER 2 PRODUCT OVERVIEW 13 Introduction to DPT146 13 Basic Features and Options 14 Transmitter Structure 15 Connection Cables 16 Loop Powered Display Optional 17 Sampling Accessories Optional 18 CHAPTER 3 FUNCTIONAL DESCRIPTION 19 Sensor Technology 19 MPS1 Multiparameter Sensor 19 DRYCAP Technology 20 Auto Calibration 20 Sensor Purge 20 Sensor Warmin...

Page 4: ...rmation 40 Show Currently Active Errors 41 Show Command List 41 Show Firmware Version 42 Show Serial Number 42 Configuring Analog Output 42 Set Analog Output Mode 42 Set Analog Output Parameters and Scaling 43 Set Analog Output Error Notification 43 Extend Analog Output Range 44 Test Analog Output 45 Serial Line Output Commands 46 Start Measurement Output 46 Stop Measurement Output 46 Set Output I...

Page 5: ...____ 5 Changing the Filter 55 Calibration and Adjustment 57 Field Check Using an MI70 Indicator 57 Repair Maintenance 59 CHAPTER 7 TROUBLESHOOTING 61 Solving Typical Problems 61 Error Messages 62 Unknown Serial Settings 62 Technical Support 63 Product Returns 63 CHAPTER 8 TECHNICAL DATA 65 Specifications 65 Spare Parts and Accessories 68 Dimensions in mm 69 ...

Page 6: ... the Leak Screw 30 Figure 17 Default Assembly of DSC74C 31 Figure 18 Alternative Assembly of DSC74C for Tight Spaces 32 Figure 19 DM240FA with DPT146 33 Figure 20 PuTTY Terminal Application 38 Figure 21 Opening the Filter 56 Figure 22 Filter Structure 56 Figure 23 Comparing Dewpoint Readings on MI70 58 Figure 24 DPT146 Dewpoint Measurement Accuracy 66 Figure 25 DPT146 Dimensions 69 List of Tables ...

Page 7: ...eral Information provides general notes for the manual and the DPT146 Chapter 2 Product Overview introduces the features advantages and product options Chapter 3 Functional Description describes the sensor technology of the DPT146 Chapter 4 Installation provides you with information that is intended to help you install the DPT146 Chapter 5 Operation contains information that is needed to operate t...

Page 8: ...anuals Table 2 Related Manuals Manual Code Manual Name M211370EN DPT146 Quick Guide Documentation Conventions Throughout the manual important safety considerations are highlighted as follows WARNING Warning alerts you to a serious hazard If you do not read and follow instructions very carefully at this point there is a risk of injury or even death CAUTION Caution warns you of a potential hazard If...

Page 9: ...aisala ESD Protection Electrostatic Discharge ESD can cause immediate or latent damage to electronic circuits Vaisala products are adequately protected against ESD for their intended use It is possible to damage the product however by delivering electrostatic discharges when touching removing or inserting any objects inside the equipment housing To make sure you are not delivering high static volt...

Page 10: ...he following EU directive s EMC Directive Conformity is shown by compliance with the following standards EN 61326 1 Electrical equipment for measurement control and laboratory use EMC requirements for use in industrial locations EN 550022 Information technology equipment Radio disturbance characteristics Limits and methods of measurement Patent Notice The Vaisala Dewpoint and Pressure Transmitter ...

Page 11: ...Vaisala or third parties The customer is allowed to use the software only to the extent that is provided by the applicable supply contract or Software License Agreement Warranty Visit our Internet pages for more information and our standard warranty terms and conditions www vaisala com warranty Please observe that any such warranty may not be valid in case of damage due to normal wear and tear exc...

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Page 13: ... Temperature output is also available if the transmitter has been ordered with serial line output DPT146 also calculates two other parameters ppm moisture by volume and dewpoint in atmospheric pressure The transmitter s compact size makes it well suited for integration into OEM systems Table 3 Output Parameters of DPT146 Parameter Abbreviation Metric Unit Non Metric Unit Dewpoint frost point tempe...

Page 14: ...d parameters Dewpoint 60 30 C 76 86 F Td Pressure absolute 1 10 bar 14 5 145 psi Temperature 40 80 C 40 176 F Two analog output channels selectable from 0 20 mA 4 20 mA and 0 5 V 0 10 V Digital output non isolated RS 485 Easy verification of dewpoint measurement with the Vaisala DRYCAP Hand Held Dewpoint Meter DM70 Optional accessories USB service cable for configuration and calibration Loop power...

Page 15: ...er Structure where 1 30 mm nut 2 Transmitter body 3 4 pin M8 connector I analog outputs and operating power 4 4 pin M8 connector II shown with protective cap Non isolated RS 485 and operating power 5 Sealing ring included with transmitters that have ISO or UNF connection thread 6 Connection thread 7 Stainless steel mesh filter that protects the MPS1 sensor When the transmitter is delivered the fil...

Page 16: ...ded 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 68 0910 135 Figure 3 Cable with Threaded Connector 0809 002 Figure 4 USB Service ...

Page 17: ...ay 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 Configure the display functions and scaling according to the documentation delivered with the display 1102 053 Figure 5 Nokeval 301 Loop Powered Display NOTE The loop resistance of the display must be included i...

Page 18: ...___________ M211372EN B Sampling Accessories Optional DPT146 is compatible with various sampling accessories For more information on performing sampling and a description of the accessories see section Sampling from a Process on page 27 For the order codes of the sampling accessories refer to section Spare Parts and Accessories on page 68 ...

Page 19: ...a 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 1109 037 Figure 6 MPS1 Sensor There are several important advantages in using a transmitter with an integrated sensor Reduces installation work and cost...

Page 20: ... 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 transmitter outputs the dewpoint value prior to the procedure Auto calibration is carried out only if several criteria for the measurement environment are fulfilled This ensures the reli...

Page 21: ... 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 BAROCAP Technology The BAROCAP silicon capacitive absolute pressure sensor was developed by Vaisala for barometric pressure measurement applications The BAROCAP sensor has excelle...

Page 22: ... will display the last measured values before the sensor purge began Normal operation and output is typically achieved no later than 11 minutes after startup The sensor purge will repeat every 24 hours and auto calibration every hour The output will again be frozen for their duration Normal output Normal output 5 s Output frozen 5 min 3 6 min Time Purge 3 4 min Autocal 2 min Purge will repeat ever...

Page 23: ...ng the serial line and the serial commands are provided in Chapter 5 Operation on page 35 Examples of configurable settings for analog outputs 1 Analog output mode output parameters and scaling 2 Analog output error level Examples of configurable settings for RS 485 output 1 By default DPT146 transmitters are configured for single transmitter operation Serial operation mode is STOP and address is ...

Page 24: ...nce 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 Note that the dewpoint temperature must be clearly lower than the ambient temperature to avoid condensation in the sampling line Sampling from the process is easy by usin...

Page 25: ...When installing a transmitter with ISO or UNF thread use the provided sealing ring to achieve a tight installation Check that the sealing ring remains centered 1109 032 Figure 9 Installing the Transmitter 1109 033 Figure 10 Tightening with a Wrench 3 Tighten the connection by turning with a wrench max 50 Nm CAUTION Only tighten the transmitter from the 30 mm nut Do NOT apply force to other points ...

Page 26: ...in permanent installations Temporary simultaneous use with the USB service cable or DM70 handheld dewpoint meter which also provide power is OK Table 4 Connector Pinouts Pin Connector I Connector II Wire color 1 VDC supply VDC supply Brown 2 Ch1 RS 485 D0 White 3 GND GND Blue 4 Ch2 RS 485 D1 Black 1109 034 Figure 11 Connectors I and II 1 VDC Vs 3 GND 4 CH2 2 CH1 V mA V mA 15 28 VDC V out 21 28 VDC...

Page 27: ...T242SC is a basic sampling cell with only the main sampling cell body The inlet and outlet are female threaded sample connectors inlet G3 8 outlet G1 4 ISO Refer to Figure 13 on page 28 DMT242SC is suitable for users requiring only a sampling cell to fit the transmitter into and doing further assembly piping into inlet and outlet valves possible flow meter by themselves DMT242SC2 Sampling Cell wit...

Page 28: ...ewdriver The leak screw should be half a turn open This can be verified by first closing the leak screw then turning 1 2 turn to open it Then the air coming out will make a barely audible little hiss which can be lightly felt when putting a hand in front of the air stream NOTE Do not open the leak screw more than 1 2 turn to avoid reducing the pressure in the sampling cell The DSC74 comes with a q...

Page 29: ... 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 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 fl...

Page 30: ...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 DSC74B parts are Sampling cell thread 3 8 G 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 15 DSC74B where 1 Gas goes in 2 Gas comes out 0510 033 Figure 1...

Page 31: ... 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 DSC74C parts are Sampling cell thread 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 Diffusion coil for measurem...

Page 32: ...____________________________________________________ M211372EN B 0403 113 Figure 18 Alternative Assembly of DSC74C for Tight Spaces where 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 ...

Page 33: ...lation 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 2 3 4 1 1108 006 Figure 19 DM240FA with DPT146 where 1 Measured gas 2 DPT146 transmitter 3 DM240FA flange thread G1 2 ISO 4 Recommended additiona...

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Page 35: ...ata is available from the analog outputs or serial line For a description of how the diagnostic functions of the sensor affect the availability of live measurement at start up see section DPT146 Startup Sequence on page 22 If serial line output is used note that the transmitter will behave according to the configured serial mode In STOP mode the transmitter outputs the transmitter model and softwa...

Page 36: ...the USB service cable is not connected Disconnect the cable if you have already connected it 2 Insert the media that came with the cable or download the driver from www vaisala com 3 Execute the USB driver installation program setup exe and accept the installation defaults The installation of the driver may take several minutes 4 After the driver has been installed connect the USB service cable to...

Page 37: ...al settings category and check that the correct 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 4 Check that the other serial settings are correct for your connection and change if necessary Flow control should be set to None unless you h...

Page 38: ...R S GUIDE____________________________________________________________________ 38 __________________________________________________________________ M211372EN B 0807 004 Figure 20 PuTTY Terminal Application ...

Page 39: ...exceed their range 10 ASEL Set analog output parameters and scaling ATEST Test analog outputs CLOSE Close the temporary connection and return the device to POLL mode ERRS Display the currently active errors FORM modifier string Set output format FRESTORE Restore factory settings HELP Show list of currently available serial commands INTV 0 255 S MIN H Set the continuous output interval for RUN mode...

Page 40: ...s 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 23 Serial number F4040027 Batch number F3420010 Module number F3410011 Sensor number F1610003 Cal date 20110907 Cal info Vaisala HEL Time 05 11 35 Serial mode STOP Baud P D S 19200 N 8 1 Output interval 5 S Serial delay 1...

Page 41: ...currently active transmitter error messages Possible errors and their causes are listed in Table 11 on page 62 ERRS cr Example errs No errors Example one active error caused by physical damage to the sensor errs T MEAS error Show Command List Use the HELP command to show a list serial commands HELP cr Example help ADDR AERR AMODE AOVER ASEL ATEST CLOSE ERRS FORM FRESTORE INTV OPEN R RESET SDELAY S...

Page 42: ... 23 Show Serial Number SNUM cr 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 cr 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 Available options are the same as for channel 1 Example amode 2 5 Ch1 output 4 20 mA ...

Page 43: ... current settings asel Ch1 Tdf lo 60 00 C Ch1 Tdf hi 40 00 C Ch2 P lo 0 00 bara Ch2 P hi 10 00 bara Example change output parameters to TDFA and H2O and set scaling asel h20 ta Ch1 Tdfa lo 00 00 C 80 Ch1 Tdfa hi 00 00 C 20 Ch2 H2O lo 0 00 ppm 0 Ch2 H2O hi 0 00 ppm 500 Set Analog Output Error Notification If the transmitter is malfunctioning the analog output is set to a specified level This overri...

Page 44: ...s a severe device malfunction the error output value is not necessarily shown Extend Analog Output Range Use the AOVER command to allow the analog output channels to exceed their specified range by 10 The scaling of the parameter remains as before the extra range is used for additional measurement range in the high end of the scale AOVER ON OFF cr Example aover on AOVER ON The following example il...

Page 45: ...ted multimeter After testing the outputs give the ATEST command again to exit the test mode ATEST ch1 ch2 cr where ch1 Analog output value for channel 1 ch2 Analog output value for channel 2 The command output shows the test value of the analog output as well as diagnostic information that may be useful to Vaisala Service if there is a problem with the analog outputs Example enabling analog output...

Page 46: ... command R cr Example measurement message in default format r Tdf 12 5 C P 0 990 bara T 24 4 C H2O 15489 ppm Tdfatm 13 5 C Tdf 12 5 C P 0 990 bara T 24 4 C H2O 15488 ppm Tdfatm 13 5 C Tdf 12 5 C P 0 990 bara T 24 4 C H2O 15502 ppm Tdfatm 13 5 C 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 ...

Page 47: ...or H The shortest output interval with n 0 outputs the measurement messages as quickly as the transmitter s internal measurement cycle produces them without additional delay Example intv 1 min Output interval 1 MIN 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 cr where...

Page 48: ...s are used See Table 7 and Table 8 on page 49 and examples below You can return to the default format using the FORM command Example of default output continuous output from RUN mode Tdf 12 5 C P 0 949 bara T 24 4 C H2O 15506 ppm Tdfatm 13 5 C Tdf 12 5 C P 0 949 bara T 24 4 C H2O 15500 ppm Tdfatm 13 5 C Command to set output format as Tdf and P with Modulus 256 checksum form 3 1 Tdf Tdf U3 3 3 P P...

Page 49: ... 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 Currently active transmitter errors in a four bit field bit0bit1bit2bit3bit4 bit0 T MEAS error bit1 P out of range error bit2 Fmeas error bit3 Flash csum error SN Transmitter serial number TIME Time since transmitter was started or reset Ux Shows the name ...

Page 50: ...t Serial Line Operating Mode Use the SMODE command to set the start up operating mode of the serial line SMODE mode cr where mode STOP RUN or POLL Table 9 Selection of Output Modes Mode Measurement Output Available Commands STOP Only with the SEND command All default mode RUN Automatic output Only command S POLL Only with the SEND addr command SEND addr and OPEN addr Other commands available after...

Page 51: ...f 19200 N 8 1 you will have to power off the MI70 before it can find the transmitter you will not be able to connect it on the fly SERI b p d s cr where b baud rate 300 600 1200 2400 4800 9600 or 19200 p parity n none e even o odd d data bits 7 or 8 s stop bits 1 or 2 Example seri 9600 e 7 1 Baud P D S 9600 E 7 1 Set Transmitter Address To operate in the POLL mode the transmitter must have an addr...

Page 52: ...easing 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 cr where delay Serial line delay range 0 255 Example sdelay 20 Serial delay 20 Other Commands Opening the Transmitter in POLL Mode Use the OPEN command to connect to a transmitter that is in POLL mode OPEN address cr where address Transmitter address rang...

Page 53: ...how long the transmitter has been operating since it was last reset or powered up TIME cr Example time Time 03 14 10 Reset Transmitter Use the RESET command to reset the transmitter RESET cr 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 transmitter will be set to the mode that was set...

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Page 55: ... Filter Replace the filter if it is contaminated New filters and related accessories are available from Vaisala see section Spare Parts and Accessories on page 68 CAUTION Be careful when changing the filter since it is easy to break the sensor when the filter is removed CAUTION If the transmitter is installed in a pressurized chamber always make sure that the pressure of the chamber is equalized w...

Page 56: ...he Filter 1109 002 Figure 22 Filter Structure where 1 Sealing ring use with UNF and ISO threads only 2 MPS1 multiparameter sensor 3 Stainless steel mesh filter turn from top of the filter Replace the filter as follows 1 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 2 Pull the filter straight out carefully do not ...

Page 57: ... in the DM70 package A calibrated reference probe that is suitable for the intended measurement environment and dewpoint range The DMP74B probe is recommended for checking the dewpoint and temperature measurement accuracy For checking all parameters you can use another DPT146 transmitter as a reference You also need a connection cable Vaisala order code 219980 to connect the DPT146 to the MI70 ind...

Page 58: ...Figure 23 Comparing Dewpoint Readings on MI70 7 After the measurement has stabilized check the difference between the readings It will give you an indication of the approximate drift of the DPT146 and its need for calibration The difference between the readings should be no greater than the combined measurement uncertainty of the DPT146 and the reference probe 8 Write down the results and repeat t...

Page 59: ...epair 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 61 ...

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Page 61: ...Vaisala technical support See section Technical Support on page 63 Table 10 Troubleshooting Table Problem Possible Causes and Solutions Transmitter outputs stars on serial line instead of measurement data Possible causes damaged sensor incorrect supply voltage and unsuitable measurement environment Power cycle or reset the transmitter and see if the problem continues Check the active errors using ...

Page 62: ... and restoring the factory settings contact a Vaisala service center Unknown Serial Settings If you are not sure what the current serial settings of your transmitter are follow the steps below to connect to the transmitter This procedure assumes you have the USB service cable available For more information on the USB service cable and the PuTTY terminal application see section Serial Communication...

Page 63: ...sk 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 Product Returns If the product must be returned for service see www vaisala com returns For contact inf...

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Page 65: ...80 C 40 176 F Table 13 Calculated Parameters Parameter Measured Range ppm moisture by volume 1 40 000 ppm Dewpoint converted to atmospheric pressure 75 30 C 103 86 F Table 14 Performance Property Description Value Dewpoint accuracy 2 C 3 6 F see Figure 24 on page 66 Pressure accuracy at 23 C 73 4 F 0 4 FS Pressure temperature dependence 0 1 FS 10 C 18 F Temperature accuracy 0 40 C 32 104 F 0 5 C 0...

Page 66: ...specified Accuracy 2 C Td 80 1109 009 Figure 24 DPT146 Dewpoint Measurement Accuracy Table 15 Operating Environment Property Description Value Operating temperature of electronics 40 60 C 40 140 F Pressure 0 50 bar 0 725 psi Relative humidity 0 100 Measured gases Air non corrosive gases Sample flow rate No effect on measurement accuracy Table 16 Outputs Property Description Value Analog outputs 2 ...

Page 67: ...surement 20 mA load current during self diagnostics 300 mA load current External load for current output max 500 Ω voltage output min 10 kΩ Housing material AISI316L Housing classification IP65 NEMA4 Sensor protection Mesh filter AISI303 grade 18 µm Storage temperature range transmitter only 40 80 C 40 176 F shipment package 20 80 C 4 176 F Mechanical connection ISO G1 2 NPT 1 2 UNF 3 4 16 Recomme...

Page 68: ...thread 232912 Protection plug for connector 218675SP Loop powered external display 226476 ISO 1 2 plug 218773 NPT 1 2 plug 222507 Basic sample cell DMT242SC Sample cell with Swagelok 1 4 male connectors DMT242SC2 Sample cell with quick connector and leak screw DSC74 Two pressure sampling cell DSC74B Two pressure sampling cell with coil DSC74C Separate cooling venting coil for sampling cells DMCOIL...

Page 69: ..._ Technical Data VAISALA _______________________________________________________________________ 69 Dimensions in mm 76 32 5 120 5 G 1 2 ISO 228 1 Ø33 AW 30 128 5 76 32 5 Ø12 Ø12 Ø12 1 2 NPT Ø29 5 Ø29 5 Ø29 5 120 5 32 5 76 3 4 16 UNF 1109 025 Figure 25 DPT146 Dimensions ...

Page 70: ...www vaisala com M211372EN ...

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