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User's Guide ______________________________________________________________________  

14 __________________________________________________________________ M210934EN-B 

WATER SOLUBILITY IN MINERAL TRANSFORMER OIL

10

100

1000

10000

0

10

20

30

40

50

60

70

80

90

100

Temperature (°C)

average water
solubility

range of
variation due to
oil type
range of
variation due to
oil type

 

 

0510-029 

Figure 2 

The Water Solubility of Transformer Oils versus 
Temperature 

The margins show the range of variation of water solubility found in 
mineral oils. 

Содержание HUMICAP MMT162

Страница 1: ...USER S GUIDE Vaisala HUMICAP Moisture and Temperature Transmitter for Oil MMT162 M210934EN B ...

Страница 2: ...echanical 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 ...

Страница 3: ...y 7 Trademarks 8 License Agreement 8 Warranty 8 CHAPTER 2 PRODUCT OVERVIEW 9 Introduction to MMT162 9 Basic Features and Options 10 Transmitter Structure 10 Typical Applications 12 Method Used for Measuring Moisture in Oil 12 Lubrication Oil 12 Transformer Oil 13 CHAPTER 3 INSTALLATION 15 Installing the Transmitter 15 Wiring 17 Connection Cables 18 Power Supply Requirements 20 CHAPTER 4 OPERATION ...

Страница 4: ...ge for LED Alarm 35 Extend Analog Output Range 36 Serial Line Output Commands 36 Start Measurement Output 36 Stop Measurement Output 36 Set Output Interval 37 Output Reading Once 37 Troubleshooting Commands 38 Display the Currently Active Errors 38 Test Analog Outputs 38 Other Commands 39 Opening the Transmitter in POLL Mode 39 Closing the Connection to a Transmitter in POLL Mode 39 Display Comman...

Страница 5: ...ls versus Temperature 14 Figure 3 Removing the Transportation Protection Cap 15 Figure 4 Installing the Transmitter 16 Figure 5 Connecting the Cable 16 Figure 6 Connectors I and II 17 Figure 7 Connector Pinout 17 Figure 8 Cable with Snap On Connector 18 Figure 9 Cable with Threaded Connector 18 Figure 10 Cable with 90 Angle Threaded Connector 19 Figure 11 LED Cable 19 Figure 12 USB Serial Interfac...

Страница 6: ...User s Guide ______________________________________________________________________ 4 ___________________________________________________________________ M210934EN B This page intentionally left blank ...

Страница 7: ...of the following chapters Chapter 1 General Information provides general notes for the manual and the product Chapter 2 Product Overview introduces the features advantages and the product nomenclature Chapter 3 Installation provides you with information that is intended to help you install the product Chapter 4 Operation provides information that is needed in basic maintenance of the product Chapt...

Страница 8: ...t 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 you do not read and follow instructions carefully at this point the product could be damaged or important data could be lost NOTE Note high...

Страница 9: ...zard CAUTION Do not modify the unit Improper modification can damage the product or lead to malfunction Recycling Recycle all applicable material Dispose of batteries and the unit according to statutory regulations Do not dispose of with regular household refuse Regulatory Compliances The Vaisala HUMICAP Moisture and Temperature Transmitter for Oil MMT162 complies with the following performance an...

Страница 10: ...e Agreement All rights to any software are held by 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 For certain products Vaisala normally gives a limited one year warranty Please observe that any such warranty may not be valid in case of damage due to normal wear and tea...

Страница 11: ...sed on changes in its capacitance as the thin polymer film absorbs water molecules The MMT162 transmitter is available with either metal or plastic housing The transmitter can be configured in many ways two analog output signals can be scaled the measurement ranges can be changed within certain limits and there are two mechanical connection options ISO and NPT 1 2 The MMT162 probe is supplied with...

Страница 12: ...cable Different cable lengths available Available with two different thread options ISO G1 2 and NPT 1 2 Low maintenance requirements due to excellent long term stability LED cable option that enables a visual alarm function Field calibration possible with MM70 Two filter types available stainless steel grid filter and high flow stainless steel grid filter 1 m s Transmitter Structure The structure...

Страница 13: ..._________ 11 0805 007 Figure 1 Moisture and Temperature Transmitter for Oil MMT162 where 1 4 pin M8 connector I analog output channels and operating power 2 4 pin M8 connector II shown with protective cap digital output RS 485 and operating power 3 30 mm nut 4 HUMICAP sensor protected with stainless steel grid filter 5 Connection thread ISO G1 2 or NPT 1 2 ...

Страница 14: ... most important advantages of this system are the fact that water activity is immune to the aging of oil and to additives and that the MMT162 transmitter can be used for continuous on line measurements In addition the MMT162 can be calibrated against salt solutions and no reference oils are needed NOTE To avoid self heating of the probe and consequential measurement errors make sure there is some ...

Страница 15: ...ture which is absorbed by the oil surrounding it Saturation level is thus a true indicator of moisture present The MMT162 method provides for a reliable detection of the aging of oil and possible leakages Oil immersed transformers rely on the oil for cooling protection from corrosion and as an important component of their insulation Excessive moisture contents in oil causes accelerated ageing of t...

Страница 16: ...B WATER SOLUBILITY IN MINERAL TRANSFORMER OIL 10 100 1000 10000 0 10 20 30 40 50 60 70 80 90 100 Temperature C average water solubility range of variation due to oil type range of variation due to oil type 0510 029 Figure 2 The Water Solubility of Transformer Oils versus Temperature The margins show the range of variation of water solubility found in mineral oils ...

Страница 17: ...oving the Transportation Protection Cap 2 Prepare the sealing of the connection If the transmitter has a parallel ISO G1 2 thread place the sealing ring at the base of the thread Always use a new sealing ring do not re use a previously installed one If the transmitter has an NPT 1 2 thread do not use the sealing ring Instead apply PTFE tape or suitable paste sealant to the thread Follow the applic...

Страница 18: ...ove If you do not have a 30 mm wrench use a 1 3 16 wrench or an adjustable wrench instead CAUTION Only tighten the probe from the 30 mm nut Do NOT apply force to other points in the probe body 5 Connect the wires of the connection cable 0710 130 Figure 5 Connecting the Cable 6 Plug in the cable to the transmitter Be sure to use the correct connector refer to section Wiring on page 17 7 Cover the u...

Страница 19: ...n VAISALA _______________________________________________________________________ 17 Wiring Pin I II Wire Colour 1 Vcc Vcc Brown 2 Analog output 1 RS 485 B White 3 GND GND Blue 4 Analog output 2 LED RS 485 A Black 0707 035 Figure 6 Connectors I and II 0707 036 Figure 7 Connector Pinout ...

Страница 20: ...available for MMT162 Unshielded cable with M8 female straight snap on connector Shielded cables with M8 female straight threaded connector Shielded cables with M8 female 90 angle threaded connector LED cable USB serial interface cable Figure 8 Figure 9 Figure 12 and Figure 10 below show the different cable options that are available 0510 036 Figure 8 Cable with Snap On Connector 0510 037 Figure 9 ...

Страница 21: ...______________________________________________ Installation VAISALA _______________________________________________________________________ 19 0809 004 Figure 10 Cable with 90 Angle Threaded Connector 0809 003 Figure 11 LED Cable ...

Страница 22: ...rface Cable For the cable order codes see section Spare Parts and Accessories on page 61 Power Supply Requirements The MMT162 transmitters are designed to operate with a supply voltage of 14 24 VDC The power supply should maintain the voltage for all load conditions Current consumption during normal measurement is 20 mA load current For more specific information see chapter Technical data on page ...

Страница 23: ...is ready to be used once it has been connected to a power source Analog Output Operation Modes The MMT162 has two analog output channels These channels can function in two different modes which can be set individually for both channels 1 Normal operation mode 2 Limit alarm mode When the transmitter is ordered from Vaisala the modes are configured as specified in the order form You can change the o...

Страница 24: ... activated when the measured quantity goes below the low limit or above the high limit The alarm levels and limits are configurable using the ALARM command see page 35 By default the alarm levels are set as follows For current output an active alarm is indicated by the current being at the maximum of the scale 20 mA For voltage output an active alarm is indicated by the voltage being at the maximu...

Страница 25: ...ect to serial interface 1 If you have not used the MMT162 USB serial connection cable before install the driver that came with the cable Refer to section Installing the Driver for the USB Cable on page 24 for detailed instructions 2 Connect the USB serial connection cable between your PC and the RS 485 port of the MMT162 port II 3 Open the terminal program e g PuTTY in Microsoft Windows 4 Set the ...

Страница 26: ...al minutes 4 After the driver has been installed connect the USB cable to a USB port on your PC Windows will detect the new device and use the driver automatically 5 The installation has reserved a COM port for the cable Verify the port number and the status of the cable using the Vaisala USB Instrument Finder program that has been installed in the Windows Start menu Windows will recognize each in...

Страница 27: ...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 have...

Страница 28: ...s Guide ______________________________________________________________________ 26 __________________________________________________________________ M210934EN B 0807 004 Figure 13 PuTTY Terminal Application ...

Страница 29: ...nalog outputs ATEST Set and display current output values CLOSE Close the temporary connection Back to POLL mode CRH Relative humidity calibration CT Temperature calibration ERRS List present transmitter errors FORM Set the output format of SEND and R commands FRESTORE Restore factory settings HELP List the most common commands INTV 0 255 S MIN H Set the continuous output interval for RUN mode LED...

Страница 30: ...e command cr cr Example MMT162 0 92 Serial number G0000002 Batch number D0720012 Module number Sensor number C6010000 Sensor model Humicap L2 Cal date YYYYMMDD Cal info NONE Time 00 21 19 Serial mode STOP Baud P D S 4800 E 7 1 Output interval 2 S Serial delay 0 Address 0 Pressure 1 0132 bar Filter 0 800 Ch1 output 0 20 mA Ch2 output 0 20 mA Ch0 error out 0 000 mA Ch1 error out 0 000 mA Ch0 aw lo 0...

Страница 31: ...ate 110 150 300 600 1200 2400 4800 9600 19200 38400 p Parity n none e even o odd d Data bits 7 or 8 s Stop bits 1 or 2 Example SERI 600 N 8 1 600 N 8 1 You need to reset the transmitter to activate the new communication settings set with the SERI command The settings can be changed one parameter at a time or all parameters at once SERI O changing parity only 4800 O 7 1 SERI 600 N 8 1 changing all ...

Страница 32: ... s minimum answer delay The value can be set between 0 255 Example sdelay Serial delay 0 10 sdelay Serial delay 10 Set Transmitter Address Addresses are required only for POLL mode see Set Serial Interface Mode on page 32 Use the ADDR command to input the RS 485 transmitter address ADDR aa where aa address 0 99 default 0 Example the transmitter is configured to address 99 ADDR Address 2 99 Format ...

Страница 33: ... use the abbreviations of the quantities The modifiers are presented in Table 6 on page 31 below Table 6 Modifiers Modifier Description x y Length modifier number of digits and decimal places t Tabulator r Carriage return n Line feed String constant xxx Special character code xxx decimal for example 027 for ESC U5 Unit field and length optional Example form aw 6 4 aw t t 6 2 t r n 1 send aw 0 2644...

Страница 34: ... In STOP mode measurements output only by command SEND all commands can be used In RUN mode outputting automatically only command S can be used to stop In POLL mode measurements output only with command SEND addr When several transmitters are connected to the same line each transmitter must be entered an own address in the initial configuration and POLL mode must be used Configuring Measurement Pa...

Страница 35: ...nit ºF ppm for transformer oil only H2O Example asel Ch0 aw lo 0 00 Ch0 aw hi 1 00 Ch1 T lo 20 00 C Ch1 T hi 80 00 C Set Analog Output Mode mA V The AMODE command can be used to change the analog output mode of channels 1 and 2 When used without parameters it displays the current settings and with parameters new settings can be set The available parameters are listed in Table 7 on page 33 below Ta...

Страница 36: ...nter the values Example current outputs acal 1 Ch1 U1 V 1 001 Ch1 U2 V 9 011 acal 2 Ch2 U1 V 0 0988 Ch2 U2 V 0 8997 Set Malfunction Alarm Output for Analog Channels Use the AERR command to set the analog output levels that are output in case of a device malfunction The default output level is 0 AERR Example aerr Ch1 error out 10 000V 0 Ch2 error out 1 000V 0 NOTE The error output value must be wit...

Страница 37: ...mmand The following example shows that a high limit alarm has been enabled for channel 2 If the measured value rises above the limit 0 90 aw an error is reported If you are using a LED cable the LED lights up to indicate an error state Example alarm Channel 1 Low Limit OFF High Limit OFF Aerr ON Quantity T Limit Lo 15 00 Limit Hi 30 00 Hysteresis 0 50 Level Lo 0 20 Level Hi 0 80 Channel 2 Low Limi...

Страница 38: ...utput 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 Example r aw 0 261 T 23 8 C H2O 15 ppm You can change the format of the output with the following commands Outputting interval can be changed with the INTV command Output message format can be changed wit...

Страница 39: ...IN or H Example intv 1 min Output interval 1 MIN The shortest output interval with n 0 is approximately one second due to the internal measurement cycle Output Reading Once Use the SEND command to output the reading once in STOP mode The output format depends on which parameters the transmitter can output SEND aa cr where aa Transmitter address 0 99 Must be specified if the transmitter is in POLL ...

Страница 40: ...he output to a given value which can then be measured with calibrated multimeter The command uses the currently selected analog output types for the channels voltage or current so you do not have to specify the unit Before testing you can verify the currently set analog output modes using the AMODE command After testing the output give the ATEST command again to exit the test mode ATEST xxx yyy cr...

Страница 41: ..._ 39 Other Commands Opening the Transmitter in POLL Mode Use the OPEN command to connect to a transmitter that is in POLL mode OPEN aa cr where aa address 0 99 Example open 0 MMT162 0 line opened for operator commands Closing the Connection to a Transmitter in POLL Mode The CLOSE command closes the connection to the transmitter CLOSE cr Example close line closed ...

Страница 42: ..._____________________________________ M210934EN B Display Command List Use the HELP command to list the available commands HELP cr Example help ACAL ADDR ADJD AERR ALARM AMODE AOVER ASEL ATEST CDATE CLOSE CRH CT CTEXT ERRS FILT FORM FRESTORE HELP INTV L LED OIL OILI OPEN PCOMP PRES R RESET SDELAY SEND SERI SMODE UNIT ...

Страница 43: ... the SMODE command 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 ppm Conversion MMT162 ppm Conversion for Transformer Oils Traditionally moisture in transformer oil is measured by using ppm units The ppm output shows the average mass concentration of water in oil The moisture and temperature ...

Страница 44: ...ading If additional accuracy is needed refer to section Conversion Model with Oil specific Coefficients below Conversion Model with Oil specific Coefficients For additional accuracy oil specific conversion model can be used both for mineral and silicon based oils An oil sample has to be sent to Vaisala for modelling As a result the specific coefficients A and B see formula 1 for the transformer oi...

Страница 45: ...fficients A and B related to your own oil type the coefficients can be set to the software of MMT162 by using serial line OIL Use the serial line command OIL to display oil specific parameters for ppm conversion With OILI command you can set new oil parameters Example oil Oil 0 1 66269994E 03 Oil 1 7 36940002E 00 Oil 2 0 00000000E 00 where Oil 0 corresponds to parameter A Oil 1 corresponds to para...

Страница 46: ...Measure the water activity of this sample with MMT162 at two temperatures that differ at least 20 C Follow the measurement stabilization illustrated by the graph NOTE The sample has to be sealed very carefully i e not to be in contact with ambient air which would change the water content NOTE If the oil sample is very dry and the temperatures are close to each other it may cause inaccuracy to the ...

Страница 47: ... Example measured water content 213 ppm T C aw ppmsaturation 24 1 0 478 213 0 478 445 6067 57 6 0 188 213 0 188 1132 979 A LOG 1132 98 LOG 445 607 1 57 6 273 16 1 24 1 273 16 1189 4581 B LOG 445 607 1189 4581 24 1 273 16 6 6503583 Assumptions The isoterm of water activity versus water concentration is linear and the solubility curve has the form of the given equation ...

Страница 48: ...User s Guide ______________________________________________________________________ 46 __________________________________________________________________ M210934EN B This page intentionally left blank ...

Страница 49: ...ment air and heptane C7H16 liquid If heptane is not available you can also use diesel oil or petrol Dry with instrument air to prevent oxidation of the oil on the sensor The oxidation of the oil on the sensor can cause extended response times or drifting 1 Blow the probe head with filter with instrument air to remove the remains of oil 2 Immerse the probe head into heptane liquid and rinse out the...

Страница 50: ...ection Spare Parts and Accessories on page 61 Changing the Sensor If you need to change the sensor on your MMT162 send it to Vaisala where the sensor will be changed for you Error States MMT162 has the following states that indicate a problem with the probe Analog 4 20 mA current output at 0 mA Analog voltage output at 0 V Serial line outputs asterisk characters The asterisk characters on the seri...

Страница 51: ...erating range probably too hot Program flash check sum error Internal error Parameter check sum error Internal error INFOA check sum error Internal error SCOEFS check sum error Internal error CURRENT check sum error Internal error Unknown error Technical Support For technical questions contact the Vaisala technical support E mail helpdesk vaisala com Fax 358 9 8949 2790 Return Instructions If the ...

Страница 52: ...dequate size with proper cushioning material to avoid damage 4 Include the information specified in step 2 in the box with the faulty product Also include a detailed return address 5 Ship the box to the address specified by your Vaisala contact Vaisala Service Centers Vaisala Service Centers perform calibrations and adjustments as well as repair and spare part services See contact information belo...

Страница 53: ...ifications You can calibrate the MMT162 yourself or send it to Vaisala for calibration Calibration and adjustment is usually carried out through serial line One point calibrations and adjustments can also be done by using an MI70 indicator and Vaisala humidity calibrator HMK15 Before the calibration the used sensor needs to be cleaned with instrument air to blow out existing oil or gently first fl...

Страница 54: ...ure that both probes are stabilized to same conditions so that the temperature readings are the same 4 Press the OK key to start adjustment One Point Relative Humidity Adjustment Note that the humidity reference must be at least 50 RH The MMT162 must be unpowered during stabilization which can take 30 minutes or more Using Serial Line To adjust the relative humidity 1 Remove the filter from the pr...

Страница 55: ...ss ENTER crh RH 25 21 Ref1 RH 25 22 Ref1 RH 25 22 Ref1 30 1 Press any key when ready RH 25 19 Ref2 OK 7 OK indicates that the adjustment has succeeded and the new calibration coefficients are calculated and stored 8 Take the probe out of the reference conditions and replace the filter Using MI70 To adjust the relative humidity 1 Connect MI70 to MMT162 2 Turn MI70 on 3 On the MI70 go to Menu Functi...

Страница 56: ...___ 54 __________________________________________________________________ M210934EN B 4 Follow the instructions given on the display 5 Select RH from the list and press Select 6 When adjusting relative humidity you need to check the environment settings before making the adjustment ...

Страница 57: ...__________________________________Calibration and Adjustment VAISALA _______________________________________________________________________ 55 7 In adjustment mode enter the correct reference value and then exit by pressing Back ...

Страница 58: ...the probe filter and insert the probe into the reference temperature 2 Enter the command CT and press ENTER CT 3 Type C and press ENTER a few times to check if the reading is stabilized Let the reading stabilize give the reference temperature after the question mark and press ENTER three times Example ct T 22 03 Ref1 T 22 03 Ref1 T 22 03 Ref1 25 0 Press any key when ready T 22 02 Ref2 OK 4 OK indi...

Страница 59: ..._______________________________________________________________ 57 Using MI70 To adjust temperature 1 Connect MI70 to MMT162 via connector II 2 Turn on MI70 3 On the MI70 display go to Menu Functions Adjustments 4 Follow the instructions given on the MI70 display 5 Select T from the list and press Select ...

Страница 60: ...ing Back 8 After you have exited the adjustment mode MI70 confirms it by displaying the message below Analog Output Adjustment In the analog output calibration the analog output is forced to the following values current output 2 mA and 18 mA voltage output 10 and 90 of the range Connect MMT162 to a calibrated current voltage meter in order to measure either current or voltage depending on the sele...

Страница 61: ...ater activity Measurement range 0 1 40 180 C 40 356 F Accuracy including non linearity hysteresis and repeatability When calibrated against salt solutions ASTM E104 85 0 0 9 0 02 0 9 1 0 0 03 Response time in oil flow typical with stainless steel filter 1 min dry wet Sensor HUMICAP Temperature Measurement range 40 80 C 40 176 F Accuracy at 20 C 68 F 0 2 C 32 36 F Typical temperature dependence of ...

Страница 62: ...l load for current output max 500 Ohm voltage output min 10 kOhm Analog outputs 2 standard current output 0 20 mA 4 20 mA voltage output 0 1 V 0 5 V 0 10 V Accuracy of analog outputs at 20 C 0 05 full scale Temperature dependence of the analog outputs current 0 005 C full scale voltage Digital output RS 485 Mechanics Interface cable connector M8 series 4 pin male with plug female with straight or ...

Страница 63: ...240 VAC external power supply POWER 1 Calibration adapter for HMK15 211302SP Filters Stainless steel grid filter 221494SP Stainless steel grid filter for high flow 1 m s 221493SP Analog RS 485 output cables 2 m 6 5 ft cable M8 snap on connector 211598 0 32 m 1 ft shielded cable M8 threaded connector HMP50Z032 3 m 9 8 ft shielded cable M8 threaded connector HMP50Z300 5 m 16 4 ft shielded cable M8 t...

Страница 64: ..._____________________________________________________________ 62 __________________________________________________________________ M210934EN B Dimensions in mm inches 0804 084 Figure 16 Metal Housing Transmitter Dimensions ...

Страница 65: ...__________________________________________________________ Technical data VAISALA _______________________________________________________________________ 63 0804 085 Figure 17 Plastic Housing Transmitter Dimensions ...

Страница 66: ...www vaisala com M210934EN ...

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