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MHT410 User's Guide in English

1. 87 DIMCNSIONS ss ne dou tn SU Meee uae ee eb old See 88 Wiring Diagrams 00 002 oo cece cece eee cee cece EERENS S 89 Recydlihg obser Son cata ted ann rene den a ses tess nat Jes 91 A Appendix Operating Principle 2 22222 94 Method Used for Measuring Moisture in Oil 95 Transformer OO 2222 senteurs donne ane SRLEE SE oon oe 95 B Appendix Modbus Reference 97 4 Function Codes iii eine 97 Register Map asmoaren neee nage tree Ras 97 Data Encoding 2 2 22 98 32 Bit Floating Point Format 98 16 Bit Integer Format 2 98 Measurement Data Read Only 99 Status Registers 2 222222222 101 Device Identification Objects 102 Exception Responses 0 2 cece cece cee cece cece a ad Git 102 C Appendix Moisture PPM Calculation for Transformer Oils 103 Calculation Model with Average Coefficients 103 Calculation Model with Oil Specific Coefficients 103 1 Safety SAFETY Vaisala Moisture Hydrogen and Temperature Transmitter MHT410 for Transformer Oil delivered to you has been tested for
2. 8 Documentation Conventions 2 2 2 8 Regulatory Compliances 2 2 22222 9 Trademarks _ 22 22 2202 cece cee cece cee cece ec ceceeceeceeceseeseees 9 SoflWare License sees pasar td Ate as ok ee cle aes dee 9 Warranty 2e tt eg Salad dite Se a aD ea E Oean S 9 3 PrOdUCEOVEIVIGW 2 oe vacua ice ARTE ARS as UE ele eit oy 10 Product Parts and Package Contents 11 Main Features 22 12 Measurement Parameters and Units _ 2 2 2 22 2 222 22 13 Data Logging hide Since etch ae eee indus 13 Status LEDS 22 0 ceccodlas05 sa ion tee aspire O Rent 14 4 Installation 2 22e 16 Planning the Installation 2 22222 17 Recommended Installation Locations 19 Mechanical Installation 20 Electrical Installation 2 27 Loop Powered Display 2222222 30 Wiring the Display 2222 31 Checklist After Installation 22 33 Oil Fittings Check After Installation 2 33 Removing the Transmitter 2222 33 5 Analog Output 2222 sarc 22ties
3. Power supply 15 30 VDC Figure 12 Wiring Option 4 Alternative Wiring to Option 3 Providing Reduced Current Loop Area for Analog Outputs Recycling es H Recycle all applicable material Disposal of Vaisala products is to be done according to local laws and regulations We encourage end users to segregate the products from other waste at end of life and use best available recycling practices to minimize related environmental impacts Almost all of the parts in our products can be recovered as material or energy If applicable Vaisala recommends removing the battery unit before recycling the rest of the device as typical electronic waste The battery unit can be recycled separately in accordance with local waste management practices and regulations Integrated small sized batteries are typically left in place and removed by professionals at the recycling facilities Table 47 Materials for Recycling Part Materials Packaging Product package Cardboard Padding foam Polyethylene Device parts 1 Electronics housing and front cover AISi10Mg 91 11 Technical Data Part Materials 2 Product label Polyester 3 Circuit board mounting plate EN 1 4404 4 Flange gasket Silicone 5 Probe shaft Outer shaft EN 1 4404 Inner plastic Polyphenylene sulfide glass fiber reinforced 6 Ventilation valve Polyester 7 Sealing r
4. 3 Product Overview No Item 1 Electronics housing The front cover is additionally connected to the housing with a grounding wire 2 Weather shield 3 Bleed screw 4 Probe body 5 Small tightening nut used to adjust and fix the depth of the transmitter in the valve You can move the tightening nut and the mounting nut along the probe body 6 Mounting nut used to fasten the transmitter in the ball valve You can move the tightening nut and the mounting nut along the probe body 7 Hydrogen sensor 8 Moisture and temperature sensors under the filter 9 Product label 10 Lead throughs 2 pcs with a minimum of one cable gland size M20x1 5 or conduit fitting Unused lead throughs are plugged Installation Kit 11 PTFE tape roll 12 Allen keys 3 mm and 5 mm 13 Extra bleed screw and sealing ring 14 Extra terminal blocks 4 x 4 screw terminals For the dimensions of the transmitter see Dimensions on page 88 Main Features Reliable online measurement of transformer oil for the following parameters o Moisture relative saturation RS water activity and water content ppm o Hydrogen concentration ppm in oil o Temperature C and F No need to take oil samples for measurement Installable and retro fittable on a ball valve 1 5 NPT thread Low maintenance requirements due to excellent long term stability Outputs o Digit
5. 60751 11 Technical Data Table 41 Operating Environment Property Specification Oiltype Mineral oil Operating humidity range 0 100 RH condensing Operating temperature range electronics 40 60 C 40 140 F Storage temperature range 40 60 C 40 140 F Pressure tolerance probe short term Max 10 bara Pressure tolerance probe continuous Max 4 bara Integrated protection for short power outages gt 3 seconds Electromagnetic compatibility Complies with EMC standard EN61326 1 Industrial environment Complies with CISPR22 class B emission limits when DC powered Fulfills the requirements of IEC 61000 6 5 in the following tests o IEC 61000 4 2 o IEC 61000 4 3 o IEC 61000 4 4 o IEC 61000 4 5 o IEC 61000 4 6 o IEC 61000 4 8 100 A m continuous o IEC 61000 4 11 o IEC 61000 4 12 The list will be continuously updated 85 11 Technical Data Table 42 Connections And Outputs Property Specification Operating voltage 15 30 VDC 24 VAC 15 power supply input is galvanically isolated Power consumption 4W typical Analog output current Three isolated 4 20 mA passive External load Max 500 Q Isolation Max 1 5 kV DC Error status indication in case 3 5 mA default user configurable for each channel of device error Accuracy of analog outputs 0 5 full scale Temperature dependence of
6. e OK Red blinking H2 concentration is above the alarm limit Alarm 14 3 Product Overview LED Color and Text Description Red steady o Error Transmitter is in error state 15 4 Installation INSTALLATION D The installation instructions in this section are the same as in the MHT410 Quick Guide Before you install the transmitter Go through the check listin section Planning the Installation on the facing page m Read the Quick Guide including installation instructions carefully m Make sure there is no negative pressure in the transformer If there is negative pressure when you open the bleed screw during installation air will be sucked into the transformer oil tank Do notopen the ball valve on the transformer until you are instructed to do so in this guide Make sure the bleed screw on the mounting nut is closed 16 4 Installation X Mechanical installation 2 Large wrench 50 mm Medium wrench 36 mm Allen key 3 mm provided PTFE tape provided Gloves Bucket and cloth Electrical installation if cable is not pre wired Allen key 5 mm provided m 2 medium wrenches 24 mm a Flathead screwdriver 2 5 mm Wire cutting pliers Suitable cable You can order the following cables from Vaisala o 5m shielded PUR cable order code CBL210392 5MSP o 10 m shielded PUR cable order code CBL210392 10M
7. time Uptime 00 50 04 Example show transmitter uptime with days time 1 Uptime t 100024 04 50 39 48 7 Vaisala Industrial Protocol Table 13 Vers Command Syntax Description vers lt cr gt Show the software version information Example vers MHT410 0 1 20 Serial Line Output and Communication Measurement Output Table 14 Intv Command Syntax Description intv lt cr gt Show the output interval of the automatically repeating measurement messages r command and run mode This command has no effect on the operation of the analog output intv iii uuu lt cr gt Set the output interval iii interval range 1 255 uuu unit for interval setting m s seconds min minutes h hours Example set the output interval to 1 second intv 1s Output interval 1 S 49 7 Vaisala Industrial Protocol Table 15 Log Command Syntax Description 1og print lt cr gt Show the measurement log with max 100 last log entries You can save the log as a file from PuTTY by configuring the following settings in PUTTY before opening the connection In the Session gt Logging window Session logging Select Printable output Log file name Type a name for the log file use extension txt and browse for the location where to save the file To prevent the log from getting very long consider saving and then clearing the log e
8. Syntax Description aerr lt cr gt Show error levels for the analog outputs channel by channel and prompt to enter a new value aerr chl ch2 ch3 lt cr gt Set new error levels for analog outputs chi Error level of the analog output for channel 1 ch2 Error level of the analog output for channel 2 ch3 Error level of the analog output for channel 3 When you set new error levels make sure they are outside the scaled output range 4 20 mA or 3 6 22 mAif aover extension is on see Aover Command on the next page aerr Chl error out 3 500 Ch2 error out 3 500 Ch3 error out 7 3 500 aerr 21 21 21 Chi error out 21 000 Ch2 error out 21 000 Ch3 error out 21 000 Example show current error levels default levels shown here Example set the error level to 21 mA on all channels mA mA mA mA mA mA 59 7 Vaisala Industrial Protocol Table 29 Aover Command Syntax Description aover lt cr gt Check whether the high end of the analog outputs is extended by 10 percent ofthe range from 20 mA to 21 6 mA aover off on lt cr gt Enable or disable the analog output overrange extension off The range of the analog outputs is 4 20mA on The range of the analog outputs is 4 21 6 mA The scaling of the outputs is not affected Example check whether the analog output range is extended extension is off and enable the ext
9. Analog Output Overrange Behavior If the measured hydrogen moisture and temperature levels go below or above their scaled range the analog output is clipped atthe low 4 mA or high 20 mA end of the output range This means the analog output will not indicate measurement readings that are outside the scaled ranges If needed you can allow the analog outputs to extend 10 of the range over 20 mA using the aover command via Vaisala Industrial Protocol see Table 29 on page 60 With this extension the allowed range for analog outputs is 4 mA 21 6 mA The aover command does not affect the scaling of the outputs You can also change the scaling of the outputs for each channel using the ase1 command See Table 30 on page 61 35 5 Analog Output CURRENT OUTPUT 21 6 mA 20 mA 4 mA MEASURED VALUE Low end High end High end of scale of scale of scale 10 Analog output of scale Analog output extended at high end of range Figure 3 Analog Output Overrange Behavior 36 6 Modbus MODBUS Overview of Modbus Protocol Support MHT410 can be accessed using the Modbus serial communication protocol The supported Modbus variant is Modbus RTU Serial Modbus over RS 485 interface The supported Modbus functions and registers are described in Appendix Modbus Reference on page 97 By default Modbus is enabled on MHT410 The pre configured default software settings are presented in the followin
10. filets meh 7 4 2015 12 37 M17 4 2019 10 05 16 4 2015 10 25 DELETE INFO EXIT Deleting Recorded Files You can delete recorded data files one by one or all files at the same time To delete a single data file 1 In the basic display select Record gt View recoded data Alternatively select Main menu gt Recording Viewing gt View recoded data 2 Select the data file based on date and time and select DELETE 3 Confirm by selecting YES To delete all data files recordings and saved displays 1 In the basic display select Record Alternatively select Main menu gt Recording Viewing 2 Select Clear data memory 3 Confirm by selecting YES Comparing Readings with MM70 Probe x a Vaisala HUMICAP Hand held Moisture Meter for Oil MM70 You can use MI70 to compare the measurement readings of MHT410 to an MM70 reference probe 73 8 MI70 Hand Held Indicator The indicator shows the readings from both devices at the same time You can also show the difference in reading for water activity Aaw and temperature AT 1 Install the MM70 probe in the same transformer as MHT410 For instructions see the MM70 User s Guide available at www vaisala com manuals 2 Turn off the MI70 indicator 3 If MHT410 is not connected to MI70 connect it to one of the MI70 ports I or Il 4 Connect the MM70 probe to the other MI70 port 5 Turn on the MI70 The basic display now shows the readings from both devi
11. 2 RH measurement error 3 T measurement error Remove the transmitter from the transformer and visually check the integrity of the transmitter and the sensor area of the probe body Contact Vaisala technical support see Technical Support on page 83 4 H measurement error Check the connection to the H3 module 1 Connect using Vaisala Industrial protocol 2 Open the connection to H3 module by giving the command h2 3 Verify whether the transmitter starts outputting H measurement data 4 Close the connection to H module by pressing the key Contact Vaisala technical support see Technical Support on page 83 5 Other error Contact Vaisala technical support see Technical Support on page 83 6 H2 alarm level exceeded 101 B Appendix Modbus Reference Device Identification Objects MHT410 Modbus conforms to the extended identification level defined in the Modbus Application Protocol Specification V1 1b Both stream access and individual access to the objects is supported Basic device identification consists of objects 0x00 0x02 Those values should be used if the device must be identified to establish its Modbus capabilities Table 55 MHT410 Device Identification Objects Object ID Object ID Hexa Object Name Example Contents Decimal decimal 0 00 VendorName Vaisala 01 ProductCode MHT410 2 02 MajorMinorVersion Softwa
12. 8 MI70 Hand Held Indicator Graphical Display The graphical display shows you the measurements as a curve From the curve you can examine the data trend and history of the last minutes To open the graphical display select Graphic in the basic display or select Main menu gt Display gt Graphic history gt Show To zoom in and out press the up down arrow keys To move back and forward in the timeline use the left right arrow keys Main Menu To open the main menu 1 Go to the basic display 2 Press any arrow key then select OPEN In the main menu you can configure the MI70 settings and basic display You can also perform certain operations with the transmitter For more information Holding and Saving the Display on the next page Recording Data on page 71 Comparing Readings with MM70 Probe on page 73 Installing and Recharging the MI70 Batteries If you are using alkaline batteries unscrew the back plate of the indicator and insert the alkalines Do not attempt to recharge standard alkaline batteries If MIZO is ordered with rechargeable battery it is already in place as shipped from the factory To recharge the batteries 1 Plug in charger connector to the indicator The plug is located at the top of the indicator covered by rubber seal 2 Connect the charger to wall socket A battery symbol in the left corner of the display starts to roll The recharge duration depends on the charge level of t
13. an electrostatic discharge when touching removing or inserting any objects inside the equipment housing Use appropriate ESD protective equipment when handling the wiring and connectors under the front cover Do not touch any parts under the circuit board cover 2 General Information GENERAL INFORMATION About This Document Table 1 Document Version History Document Code Date Description M211737EN A June 2015 This document The first version Table 2 Related Manuals Pocumen Description Code p M211736EN Vaisala Moisture Hydrogen and Temperature Transmitter MHT410 for Transformer Oil Quick Guide M211784EN Loop Powered Display 242003 for MHT410 Technical Note Documentation Conventions O 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 A 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 highlights important information on using the product 2 General Information Regulatory Compliances Up to date declarations of conformity are available at request from Vaisala www vaisala com This product is in compliance with the following EU directives EMC Directive RoHS Directive Conformity is shown by compliance to standards listed in Techn
14. see Connecting via Service Porton page 39 Start the calibration sequence with the command h2 The transmitter starts outputting H measurement data h2 SSN b11 04rt 10432tn1x FW 3 85F MDN 104400 FFO02 P1 DF 0xB4B4v L Stop the output by pressing the Esc key 7997 00 34 0852 50 11176 186 69 2654140 2652818 23 0 0 0 22 2649 0 0 wait lt ESC key gt H2scan Enter the DGA Hz reading with the db command H2scan db Enter actual hydrogen in ppm 10 Set hydrogen to 10 0ppm Y N y Enter Today s Date Month 4 Day 14 Year 2015 Walt When the Hz measurement output resumes exit the calibration sequence by pressing the key 79842 00 33 8725 50 11766 186 97 2654214 2652858 359 10 0 10 28 5654 200 200 wait lt key gt Quit hydrogen measurement module command line operation Do not exit the calibration sequence before the H2 measurement output has resumed If the H2 output does not resume automatically issue the command g to start the H2 output and then exit the calibration sequence 9 Calibration and Adjustment 6 Enter the calibration date and information using the cdate and ctext commands For example cdate 20150630 Cal date 20150630 ctext H2 cal DGA lab sample Cal info H2 cal DGA lab sample RS amp T Calibration and Adjustment MHT410 is calibrated at the factory for RS and T The recommended calibration interval for RS amp T is 3 years Vaisala provides calibration and adjustment
15. Parity None Data bits 8 Stop bits 1 Flow control None 38 7 Vaisala Industrial Protocol Connecting via Service Port Vaisala USB service cable 219690 X Computer with o Windows operating system o Free USB port o Terminal application e g PuTTy available from www vaisala com software o Driver for Vaisala USB service cable installed available on the cable installation media and at www vaisala com software You can connect to the transmitter on a computer using the service port located under the transmitter cover For a list of commands see Serial Commands on page 42 If you have not used the Vaisala USB cable before install the driver before attempting to use the cable See Installing the Driver for the USB Service Cable below for detailed instructions For more information on using a terminal application see Terminal Application Settings on the next page Connecting USB Cable To connect the USB service cable to the service port 1 Make sure the USB cable is connected to your computer 2 Open the screws on the transmitter cover and open the cover 3 Connect the USB service cable to the service port connector on the transmitter 4 Configure the terminal application settings as instructed in Terminal Application Settings on the next page Installing the Driver for the USB Service Cable Before taking the USB service cable into use for the first time you must install the provided USB dr
16. You cannot use the MI70 to configure and calibrate MHT410 To configure the transmitter use Modbus see Modbus on page 37 or Vaisala Industrial Protocol see Vaisala Industrial Protocol on page 38 For H2 calibration instructions see H2 Calibration and Adjustment on page 76 MI70 Indicator Overview Indicator Keypad ogo J 3 67 8 MI70 Hand Held Indicator 1 Function keys The functions change according to what you are doing with the indicator 2 Arrow keys Up down key Move up and down in a menu m Right key Enter a sub menu Left key Return to the previous menu level To open the main menu press any of the arrow keys and then the function key OPEN 3 Power On Off key Basic Display ab T 45 00 C RS 1000 4 H2 18 ppm CET CHE CET 2 3 4 Figure 6 MI70 Basic Display 1 Upto three measured parameters You can change the shown parameters in Main menu gt Display gt Quantities and units Function key Graphic shows the readings as a curve 3 Function key Hold Save freezes the display and you can save the reading in the MI70 memory 4 Function key Record is a quick access to the Recording Viewing menu 5 Battery indicator Shows current status charge of the battery You can change the default function key shortcuts Graphic Hold Save Record to other menus or functions in Main menu gt Settings gt User interface gt Program shortcut keys 68
17. aaa Connect to a transmitter that is in poll mode aaa transmitter address 0 255 If you do not know the address of the transmitter use the command to view the transmitter information This command cannot be used via the service port Example target transmitter in poll mode with address 5 open 5 MHT410 5 line opened for operator commands Table 25 Sdelay Command Syntax Description sdelay lt cr gt Show serial line transmission delay sdelay delay lt cr gt Set a new serial line transmission delay delay 0 255 Value corresponds to four milliseconds for example 5 0 020 second transmission delay Example set serial delay to 0 1 seconds using the delay value 25 sdelay 25 Serial delay 2 5 56 7 Vaisala Industrial Protocol Table 26 Seri Command Syntax Description seri lt cr gt Show current serial line settings for the RS 485 line of the screw terminals This command does not affect the service port settings seri p b d s lt cr gt Set new serial line settings The new settings will be taken into use when the transmitter is reset or powered up b baud rate 300 600 1200 2400 4800 9600 19200 38400 57600 p parity n none m e even o odd d data bits 7 or 8 s stop bits 1 or 2 For Modbus baud rate must be 9600 57600 and parity must be none Example show current settings seri Baud PDS
18. armement en Rocka aa seen eee 35 Analog Output Overrange Behavior 35 SMod DU Sista Cats WA enn a AAC ne eh Sie tht Ss 37 Overview of Modbus Protocol Support 2 37 7 Vaisala Industrial Protocol 38 Connecting via Service Port 2 22222 39 Connecting USB Cable 2 39 Installing the Driver for the USB Service Cable 39 Terminal Application Settings 40 Serial Commands 42 Device Information and Status 2 0 02 2222 cece eee eee eee eee 44 Serial Line Output and Communication 49 Measurement Output 22 222 49 Measurement Output Format 2 53 Serial Line Communication 2 55 Analog OUUTE cise oc teh tates aE tak A clo iets ls 59 Calibration and Adjustment 2222 63 Other Commands 0 02 cece cece cece eee ee eens 65 8 MI70 Hand Held Indicator 222 67 MI70 Indicator Overview 67 Indicator Keypad 1 1 0 0 2 ccc eee eee cece e ee cee cece eee eens 67 Basic Display 222222222
19. can switch the MI70 off during recording to save battery A progress bar is shown on the display every 10 seconds or all the time if charger is connected The progress bar shows the amount of recorded data 4 To stop the recording manually in the basic display select Record gt Record data gt Start stop recording gt Stop Do not disconnect the probe when the data recording is on even if the indicator is off This may cause loss of recorded data Table 38 Measurement Intervals and Max Recording Times Maximum Recording Time memory full Recording Interval 1 Parameter 2 Parameters 3 Parameters 1s 45 min 22 min 15 min 5s 3h 113 min 75 min 15s 11h 5h 3h 30s 22h 11h 7h 1 min 45h 22h 15h 5 min 9 days 4 days 3 days 15 min 28 days 14 days 9 days 30 min 56 days 28 days 18 days 1h 113 days 56 days 37 days 3h 339 days 169 days 112 days 12h 1359 days 678 days 451 days Viewing Recorded Data 1 Inthe basic display select Record gt View recoded data Alternatively select Main menu gt Recording Viewing gt View recoded data A list of saved displays and data recordings appears The icons on the left ofthe date and time indicate whether the file is a saved display or a longer recording of data Saved display 72 8 MI70 Hand Held Indicator Ce Data recording 2 Select the recording based on date and time by pressing the right arrow key DATA FILES
20. message 52 seri Set serial line settings for the RS 485 line of the screw 57 terminals Default is 19200 N 8 1 This command does not affect the service port settings smode Set serial line operation mode for the RS 485 line of the 58 screw terminals This command does not affect the service port settings The service port is always in stop mode unit Set temperature unit to metric C or non metric F 55 Analog output aerr Show or set error level for analog output 59 aover Enable or disable analog output 10 over range 60 asel Show or set analog output parameters and scaling 61 atest Test analog outputs by forcing them to a given value 62 43 7 Vaisala Industrial Protocol Device Information and Status Table 6 Command Command Description Page Calibration and adjustment cdate Show or set adjustment date 63 ctext Show or set adjustment information text 63 h2 Start or continue hydrogen calibration and adjustment 64 sequence Other commands filt Show or set measurement filtering 65 frestore Restore factory settings Clears all user settings factory 66 calibration remains reset Reset the device 66 MHT410 0 1 20 Serial number Batch number Sensor number Sensor model Order code Ch3 H2 hi A1234567 A1234567 A1234567 Humicap L2 A123456789 Cal date 20150414 Cal info Vaisala Uptime 0000da 04 04 41 Total time 0000da 04 04 41 Seria
21. of the transmitter s analog output channel for example to CH1 Wire from port 2 of the display connects to where the minus port wire of the analog output channel would have connected without the display For wiring alternatives see Wiring Diagrams on page 89 32 4 Installation Checklist After Installation After the installation check the following indicators to make sure the installation was successful Nooilis leaking from the transformer and the transmitter The indicator LED blinks green for some minutes and then becomes steady o Steady green indicates that the Hz level is below alarm limit o Blinking red indicates that the H level is above alarm limit m After the initial stabilization period approx 24 h power on the reading is correct Oil Fittings Check After Installation After the first month of continuous use all oil fittings should be checked for leaks An annual check thereafter is recommended Removing the Transmitter S To disconnect wiring X Allen key 5 mm provided m 2 medium wrenches 24 mm a Flathead screwdriver 2 5 mm To remove transmitter Large wrench 50 mm Medium wrench 36 mm Gloves Bucket and cloth A Do not try to close the ball valve when the transmitter is fully installed The probe body goes through the valve into the oil flow and trying to close the valve will damage the probe body 1 lfneeded disconnect the wiring a Open the fron
22. open the valve too quickly the air inside the mounting nut will be sucked into the transformer instead b When oil flows out close the bleed screw Clean the area with a cloth and open the ball valve fully 23 4 Installation 6 lfneeded continue tightening the mounting nut until the connection is oil tight 24 4 Installation 7 Push the probe to correct depth according to installation location Valve in Radiator Pipe Valve in Transformer Wall o Moisture and temperature sensors are directly in the oil flow o Hydrogen sensor is in the valve area Tip of the probe is level with transformer inner wall No part of the probe must enter the transformer chamber All sensors remain within the valve area OA Severe risk of death and of damage to transformer Pay attention to transmitter installation depth and possible energized parts inside the power transformer to minimize electric shock hazard and equipment damage 25 4 Installation 8 Tighten the small tightening nut with a wrench until itthe probe is securely fastened Electrical Installation d If the transmitter was ordered with the Vaisala cable CBL210392 5M the cable is already pre connected to the transmitter according to Wiring Option 1 To connect the cable to the transmitter 1 Open the electronics housing with a 5 mm Allen key to access the screw terminals 27 4 In
23. problem For contact information of Vaisala Service Centers see www vaisala com servicecenters 83 11 Technical Data TECHNICAL DATA Table 40 Measurement Performance Property Specification Hydrogen measurement Measurement range in oil 0 5000 ppm Accuracy in oil temp range 20 60 C 4 140 F 20 of reading or 25 ppm whichever is greater Repeatability 10 of reading or 15 ppm whichever is greater Minimum detection limit 20 ppm Typical long term stability Cross sensitivity to other gases 3 of reading year lt 2 CO2 C2H2 C2H4 CO Response time 63 of full response 2 5 hours when sensor is not in reference cycle 90 of full response Warm up time 17 hours 2 hours 12 hours for full specification Sensor Catalytic palladium nickel alloy film solid state sensor Moisture in oilmeasurement Measurement range in oil 0 100 RS a 0 1 Accuracy including non linearity hysteresis and repeatability at 20 C 68 F 0 90 RS a 0 0 9 2 RS aw 0 02 90 100 RS a 0 9 1 0 3 RS ay 0 03 Response time 10 min 90 at 20 C in still oil Sensor HUMICAP 180L2 Temperature measurement Measurement range 40 120 C 40 248 F Accuracy at 20 C 68 F 0 2 C 0 36 F Sensor Pt1000 RTD Class F0 1 IEC
24. reading f fff Measurement filter setting range 0 001 1 0 The default value is 1 0 a 1 0 Nofiltering latest measurement is output without averanging a 0 5 Average ofthe last two measurements 0 1 Average of approximately 16 measurements View the current setting and prompt to enter anew value filt Filter Example view the current value and set filtering to value 0 5 1 000 65 7 Vaisala Industrial Protocol Table 36 Frestore Command Syntax Description Factory settings restored frestore lt cr gt Restore factory settings Clears all user settings including serial communication settings transmitter address and analog output configurations H calibration remains Example frestore Table 37 Reset Command Syntax Description MHT410 0 1 20 reset lt cr gt Reset the transmitter The transmitter will restart as if it had just been powered on Example reset 66 8 MI70 Hand Held Indicator MI70 HAND HELD INDICATOR You can use the Vaisala MI70 Hand Held Indicator as a temporary display for the transmitter MI70 shows the readings for all the parameters measured by the transmitter You can also view the trend of the measurement on the graphical display and compare the moisture and temperature readings of MHT410 to a Vaisala MM70 reference probe eo The MI70 Hand Held Indicator is intended to be used as display only
25. safety and approved as shipped from the factory Note the following precautions gt PEO gt O Read the Quick Guide including installation instructions carefully before installing the product Ground the product and verify outdoor installation grounding periodically to minimize shock hazard Severe risk of death and of damage to transformer Pay attention to transmitter installation depth and possible energized parts inside the power transformer to minimize electric shock hazard and equipment damage Do not modify the unit Improper modification can damage the product or lead to malfunction Do not try to close the ball valve when the transmitter is fully installed The probe body goes through the valve into the oil flow and trying to close the valve will damage the probe body If you must close the ball valve while the transmitter is on the valve first open the small tightening nut and pull the probe body out as far as possible Then close the valve 1 Safety To avoid damage to the installation valve of the transformer do not step on the transmitter when the transmitter is installed A Follow the safety regulations related to the application and installation site 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 However it is possible to damage the product by delivering
26. scaling ch3high High limit for channel 3 output scaling 61 7 Vaisala Industrial Protocol Syntax Description Example show current parameters and scaling for each channel asel Chil RS lo 0 00 Chl RS hi 100 00 Ch2 T lo 40 00 TG Ch2 T hi 100 00 C Ch3 H2 lo 0 00 ppm Ch3 H2 hi 5000 00 ppm Example change channel 1 to output water activity adjust scaling to 0 1 for channel 1 and to 0 2000 ppm for channel 3 asel aw t h2 0 1 40 100 0 2000 Chl aw lo 0 00 Chl aw hi 1 00 CHAT lo 40 00 C Ch2 T hi 100 00 C Ch3 H2 lo 0 00 ppm Ch3 H2 hi 2000 00 ppm Table 31 Atest Command Syntax Description atest chl ch2 ch3 Set analog channel to defined output value in mA You can then measure the output with a calibrated multimeter ch1 Output level for channel 1 in mA ch2 Output level for channel 2 in mA ch3 Output level for channel 3 in mA Example enable analog output test mode set level to 20 mA on all channels atest 20 20 20 Analog output test mode ON CH1 20 000 mA CH2 20 000 mA CH3 20 000 mA Example disable analog output test mode resume normal output atest Analog output test mode OFF CHA 7 568 mA CH2 13 714 mA CH3 4 038 mA 62 7 Vaisala Industrial Protocol Calibration and Adjustment Table 32 Cdate Command Syntax Description cdate lt cr gt Show the d
27. services For more information visit the Vaisala calibration website at www vaisala com calibration 79 10 Troubleshooting TROUBLESHOOTING Error States MHT410 has the following states that indicate a problem with the transmitter Error indication on analog outputs at 3 5 mA default o With hydrogen measurement errors the hydrogen channel is in error state o With moisture in oil measurement errors the moisture in oil channel is in error state o With temperature measurement errors the temperature and moisture in oil channels are in error state o With general errors all three channels are in error state Error messages on the serial line o Modbus statuses see Modbus Device Status Bits on page 101 o Vaisala Industrial Protocol error list Table 39 Possible Error Messages via Vaisala Industrial Protocol Error Number ge e and Text Description Action 0001 Temperature Remove the transmitter from the measurement raw value is transformer and visually check the integrity Temperature outside the allowed range of the transmitter and the sensor area of measurement the probe body error 0002 Moisture measurement Contact Vaisala technical support see raw value is outside the Technical Support on page 83 Frequency allowed range measurement error 80 10 Troubleshooting Error Number and Text Description Action 0004 H2 module has reported Check the connection to the H
28. the analog outputs 0 006 C full scale Digital output Isolated RS 485 half duplex RS 485 Service Port Protocols MODBUS RTU serial ASCII commands Screw terminals Wire size AWG 22 14 Single wire solid 1 5 mm2 Stranded wire flex 1 0 mm Recommended wire torque 0 4 Nm Table 43 Mechanics Property Specification Mechanical connection on transmitter 1 5 NPT male Cable bushing optional M20x1 5 for cable diameter 8 11mm 0 31 0 43 Conduit fitting optional 1 2 NPT Interface cable optional pre assembled 5 meters 9 2 mm outer diameter Housing material AlSi 10 Mg Housing classification IP66 Transmitter weight without cables 4 1kg Table 44 Other Property Specification Self diagnostics indication Status LEDs analog output MODBUS Integrated data logging capabilities Non volatile memory up to 44 years storage with default logging 86 11 Technical Data Property Specification Individual functionaltest Calibration test reports for moisture hydrogen and reports temperature Probe leaktest report 5 bara nominal Factory warranty 5 years Table 45 Display with Relays External Option Property Specification Pre configured range for hydrogen 0 5000 ppm Pre configured alarm relays user re Relay 1 trigger limit 200 ppm hi configurable Relay 2 trig
29. xor checksum of message sent so far ASCII encoded hexadecimal notation character 54 You can also use the backslash character instead of the hash 7 Vaisala Industrial Protocol Table 21 Unit Command Syntax Description unit lt cr gt Show the current temperature unit system metric C on non metric F unit m n lt cr gt Change the temperature unit m Metric unit C n Non metric unit F Example show current unit and check the output unit Units Metric send T 45 0 C RS 10 0 H20 13 9 ppm aw 0 100 H2 18 ppm Example change temperature unit from C to F and check the output unit n Units Non metric send T 113 0 F RS 10 0 H20 13 9 ppm aw 0 100 H2 18 ppm Serial Line Communication Table 22 Addr Command Syntax Description addr lt cr gt Show current device address and prompt for anew address Addresses are required for POLL mode addr aaa lt cr gt Set new device address aaa address 0 255 Example shows 0 as current address enter 5 as the new address addr Address 0 5 Table 23 Close Command Syntax Description close lt cr gt Close the connection that was opened with the open command This command cannot be used via the service port Example close line closed 55 7 Vaisala Industrial Protocol Table 24 Open Command Syntax Description open
30. 0 13 0 00 22 10 000 13 900 45 467 18 0 12h TSt 3 5 0 00 37 O 00 59 10 000 13 900 45 303 18 0 12h TSt 4 5 O0 00 52 0 01 14 10 000 13 900 45 278 18 0 12h TSt 5 7 Q 12 00 0 13 14 10 000 13 900 45 887 18 0 12h 6 11 0 00 04 0 13 18 10 000 13 900 45 495 18 0 12h 7 11 0 00 12 0 13 26 10 000 12 900 45 716 18 1 12h 8 12 0 00 03 0 13 29 10 000 13 900 45 531 18 2 12h Example show the last 5 entries log print 5 index Reset Days Uptime Total Time RS H20 ppm Temp C H2 ppm Flags 4 5 0 00 52 0 01 14 10 000 13 900 45 278 18 0 12h Tst 5 7 0 12 00 0 13 14 10 000 13 900 45 887 18 0 12h 6 11 0 00 04 0 13 18 10 000 13 900 45 495 18 0 12h 7 11 0 00 12 0 13 26 10 000 12 900 45 716 18 1 12h 8 12 0 00 03 0 13 29 10 000 13 900 45 531 18 2 12h Example show 5 entries starting from the 3rd entry log print 5 3 index Reset Days Uptime Total Time RS H20 ppm Temp C H2 ppm Flags 3 5 0 00 37 O 00 59 10 000 13 900 45 303 18 0 12h TSE 4 5 0 00 52 0 01 14 10 000 13 900 45 278 18 0 12h Tst 5 7 Q 12 00 0 13 14 10 000 13 900 45 887 18 0 12h 6 11 0 00 04 0 13 18 10 000 13 900 45 495 18 0 12h 7 Al O0 00 12 0 13 26 10 000 12 900 45 716 18 1 22h Example enable storing a log item when H alarm level is exceeded log alarm on Alarm loggings OFF gt ON 51 7 Vaisala Industrial Protocol Syntax Description Example disable filtering the measurement values in the log log filt off 24h rolling average fi
31. 19200 N 8 1 seri 9600 N 8 1 Baud P DS A 9600 N 8 1 reset MHT410 0 1 20 Example set baud rate to 9600 and reset the transmitter take the new baud rate in use 57 7 Vaisala Industrial Protocol Table 27 Smode Command Syntax Description smode lt cr gt Show current start up operating mode for the RS 485 line of the screw terminals and prompt to enter new mode This command does not affect the service port settings The service port is always in stop mode smode mode lt cr gt smode poll Serial mode reset MHT410 0 1 20 Set serial line start up operating mode The new mode is taken into use when the transmitter is reset or powered up Available modes stop No automatic output All commands available Default mode run Automatic output of measurement messages You can stop the output with the s command and recontinue with the r command poll No automatic output Will respond to addressed send command and command You can use other commands after opening a connection using an addressed open command Use with RS 485 buses where multiple transmitters can share the same line modbus Modbus protocol is used for communication including measurement output See Modbus on page 37 Example set serial mode to poll and reset the transmitter to start up in that mode 58 7 Vaisala Industrial Protocol Analog Output Table 28 Aerr Command
32. 222 68 Graphical Display 222 69 Maine Menu on 32528 dites ae en tt Pose 69 Installing and Recharging the MI70 Batteries 69 Connecting MI70 to Service Port 70 Holding and Saving the Display 70 Recording Data 2 222222 2222222 71 Starting and Stopping the Recording 71 Viewing Recorded Data 72 Deleting Recorded Files 2 73 Comparing Readings with MM70 Probe 73 Changing the Rechargeable Battery Pack 74 9 Calibration and Adjustment 22 76 H2 Calibration and Adjustment 76 Taking DGA Sample and Saving Current H2 Reading 76 Entering DGA H2 Reading to Transmitter 78 RS amp T Calibration and Adjustment 2 79 10 Troubleshooting 2 22222222222 22222222 80 Error Stales en cuis io tn te ed PO ee atl Se tes 80 Changing Bleed Screw 2 22222 82 T chnical Support see annee ne ee Dane e heeds odie ee 83 fl Technical Data srauies shee tee nes te due Le a SSE 84 Spare Parts and Accessories
33. 2652818 23 0 0 0 22 2649 0 0 wait lt ESC key gt H2scan da Current H2 value is 14 4 ppm wait 79842 00 33 8725 50 11766 186 97 2654214 2652858 359 14 4 0 28 5654 200 200 wait lt key gt Quit hydrogen measurement module command line operation Example enter the H concentration of the DGA sample h2 lt cr gt SSN b11 04rt 10432tn1lx FW 3 85F MDN 104400 FF02 P1 DF 0xB4B4v L 7997 00 34 0852 50 11176 186 69 2654140 2652818 23 0 0 0 22 2649 0 0 wait lt ESC key gt H2scan db Enter actual hydrogen in ppm 10 Set hydrogen to 10 0ppm Y N y Enter Today s Date Month 4 Day 14 Year 2015 uwal Eein 79842 00 33 8725 50 11766 186 97 2654214 2652858 359 10 0 10 28 5654 200 200 wait lt key gt Quit hydrogen measurement module command line operation 64 7 Vaisala Industrial Protocol Table 34 on the previous page is a simplified example of the H2 calibration and adjustment sequence with the H calibration commands To calibrate and adjust the H measurement correctly follow the instructions in section H2 Calibration and Adjustment on page 76 Other Commands Table 35 Filt Command Syntax Description Eilt f fff l lt cr gt filt lt cr gt Set the speed at which the latest moisture and temperature measurementis integrated into the most recent readings The command affects both analog output and serial line output This command does not affect the H
34. OC integer 269 010C Oil moisture 16 bit ppm 10 Monthly ROC integer 270 010D Oil temperature 16 bit C 10 integer 513 0200 Device status 16 bit See Status bits Registers on the facing page Legend PDU address Actual address bytes used in a Modbus Protocol Data Unit LSW Least Significant Word bits 15 0 MSW Most Significant Word bits 31 16 16 bitinteger Numeric value in range 32768 32767 32 bit float Floating point number encoded according to IEEE 754 A complete 32 bit value two Modbus registers must be read and written in a single Modbus transaction A quiet NaN 0x7FC00000 value is returned for unavailable floating point values and NaN 0x8000 for unavailable integer values e g in case of measurement error Several registers may be read in one transaction even if there are gaps in the register map Registers not listed above contain typically value NaN or 0 Values may be unavailable in case of device failure Read status registers or exception status outputs to check for failures 100 B Appendix Modbus Reference Status Registers Table 53 Modbus Status Registers for MHT410 Register Description Logical Address Data Format Device status bits 513 16 bit integer Table 54 Modbus Device Status Bits Output Output Name bit number Notes 0 Critical Error active Maintenance needed 1 Error active Device may recover automatically
35. SP Planning the Installation Choose the installation location on the transformer See Recommended Installation Locations on page 19 Make sure the installation valve is appropriate female 1 5 NPT thread 17 4 Installation Measure and record the installation depth in the chosen valve to achieve 18 Make sure you have all the required tools for installing the transmitter The required tools are presented in Installation on page 16 optimal measurement position for the sensors Valve in Radiator Pipe Valve in Transformer Wall o Moisture and temperature sensors are directly in the oil flow This is because water molecule diffusion rate in oilis slow and therefore moisture must be measured in moving oil o Hydrogen sensor is in the valve area This is because the hydrogen sensor needs an accurate temperature control and therefore hydrogen must be measured in still oil Tip of the probe is level with transformer inner wall No part of the probe must enter the transformer chamber All sensors remain within the valve area OA Severe risk of death and of damage to transformer Pay attention to transmitter installation depth and possible energized parts inside the power transformer to minimize electric shock hazard and equipment damage Choose the output signals analog and or digital Choose the electrical wiring option See Wiring Diagrams on page 89 If the transmitter was ord
36. VAISALA USER S GUIDE Vaisala Moisture Hydrogen and Temperature Transmitter MHT410 for Transformer Oil M211737EN A PUBLISHED BY Vaisala Oyj Street address Vanha Nurmijarventie 21 F1 01670 Vantaa Finland Mailing address P O Box 26 FI 00421 Helsinki Finland Phone 358 9 8949 1 Fax 358 9 8949 2227 Visit our Internet pages at www vaisala com Vaisala 2015 No part of this manual may be reproduced published or publicly displayed in any form or by any means electronic or mechanical including photocopying nor may its contents be modified translated adapted sold or disclosed to a third party without prior written permission of the copyright holder Translated manuals and translated portions of multilingual documents are based on the original English versions In ambiguous cases the English versions are applicable not the translations The contents of this manual are subject to change without prior notice This manual does not create any legally binding obligations for Vaisala towards customers or end users All legally binding obligations and agreements are included exclusively in the applicable supply contract or the General Conditions of Sale and General Conditions of Service of Vaisala Table of Contents OS ATS TY E E E A he ee ht nce A SR Re eR ee A ne E 6 ESD Protection 1225508 agate dt ound ee te nl a ne 7 2 General Information 2 8 About This Document
37. a technical support see Technical Support on the facing page In case of constant error please contact Vaisala See Technical Support on the facing page Changing Bleed Screw If oil starts flowing out from the bleed screw on the mounting nut tighten the bleed screw If oil still flows out change the bleed screw x New bleed screw provided in the MHT410 installation kit Medium wrench 36 mm Large wrench 50 mm m Allen key 3 mm provided in the MHT410 installation kit 82 10 Troubleshooting ON Oa F ND Loosen the tightening nut of the transmitter Pull the transmitter outward so that the probe body is out of the ball valve Close the ball valve Turn the mounting nut so that the bleed screw is on top of the nut Remove the bleed screw from the mounting nut Install a new bleed screw and tighten it firmly Tighten the mounting nut until the connection is oil tight Push the probe to the same installation depth Tighten the small tightening nut with a wrench until it the probe is securely fastened 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
38. al Modbus and Vaisala industrial protocol over RS 485 o Analog three channels with scalable current output Status indication LEDs in the front panel see Status LEDs on page 14 12 3 Product Overview Built in data logging see Data Logging below USB connectivity for service connections using an optional USB M8 cable see Connecting via Service Port on page 39 Display options o Loop powered display for continuous use see Loop Powered Display on page 30 o MI70 hand held meter for temporary use see MI70 Hand Held Indicator on page 67 For detailed technical specifications see Technical Data on page 84 Measurement Parameters and Units Parameter Abbreviation Unit H2 concentration in oil ihaverage H2 ppm 24haverage Rate of change of H2 concentration Inaday Daily ROC ppm day In a week Weekly ROC ppm week In a month Monthly ROC ppm month Moisture in oil Relative saturation RS RS Water activity aw RS 100 no unit H20 concentration in oil H20 ppm Rate of change of moisture in oil In a day Daily ROC ppm day In a week Weekly ROC ppm week In a month Monthly ROC ppm month Temperature Oil temperature T C or F Not available on analog output Data Logging The transmitter automatically saves the measurement readings and other events in a log every 12 hours The log can contain approximately 32000 entries The fo
39. ate of the last adjustment cdate yyyymmdd lt cr gt Set a new calibration and adjustment date format yyyymmdd cdate Cal date 20150201 Example show current calibration date Example set new calibration date cdate 20150630 Cal date 20150630 Table 33 Ctext Command Syntax Description ctext lt cr gt Show adjustment information text ctext text lt cr gt Set a new calibration and adjustment information text Example show current calibration text ctext Cal info Vaisala Example set new calibration text ctext H2 cal DGA lab sample Cal info H2 cal DGA lab sample 63 7 Vaisala Industrial Protocol Table 34 H2 Command Syntax Description h2 lt cr gt Start H adjustment and save the current H da lt cr gt reading measured bythe transmitter When you start the adjustment with the h2 command normal measurement stops temporarily and the transmitter goes into error state Measurement returns to normal when you exit the H calibration h2 lt cr gt Continue H adjustment and enter the H3 db lt cr gt concentration of the DGA sample After the adjustment set the adjustment date and information using the cdate and ctext commands Example save current H reading measured by the transmitter h2 lt cr gt SSN b11 04rt 10432tn1lx FW 3 85F MDN 104400 FF02 P1 DF 0xB4B4v L 7997 00 34 0852 50 11176 186 69 2654140
40. average MSW 5 00 04 H2 Daily ROC LSW 32 bit float ppm in oil 6 0005 MSW 7 00 06 H2 Weekly ROC LSW 32 bitfloat ppm in oil 8 00 07 MSW 9 00 08 H2 Monthly LSW 32 bitfloat ppm in oil 10 00 09 ROC MSW 15 00 0E Oil moisture LSW 32 bit float RS relative l 16 00 0F saturation MSW 17 0010 Oil moisture LSW 32 bit float ppm 18 0011 current MSW 19 00 12 Oilmoisture 24 LSW 32 bitfloat ppm 20 00 13 haverage MSW 21 00 14 Oil moisture LSW 32 bit float ppm 22 0015 Daily ROC MSW 23 00 16 Oilmoisture LSW 32 bitfloat ppm 24 00 17 WeeklyROC MSw 25 00 18 Oilmoisture LSW 32 bit float ppm 26 00 19 Monthly ROC MSW 27 00 1A Oiltemperature LSW 32 bit float C 28 00 1B MSW 257 01 00 H2 1 h average 16 bit ppm in oil integer 258 0101 H2 24h 16 bit ppm in oil average integer 259 01 02 H2 Daily ROC 16 bit ppm in oil integer 260 01 03 H2 Weekly ROC 16 bit ppm in oil integer 99 B Appendix Modbus Reference Logical RDU Address Aek Register Description pata Unit F hexa Format decimal h decimal 261 01 04 H2 Monthly 16 bit ppm in oil ROC integer 264 0107 Oil moisture 16 bit RS 10 relative integer saturation 265 0108 Oil moisture 16 bit ppm 10 current integer 266 01 09 Oilmoisture 16 bit ppm 10 24h average integer 267 010A Oil moisture 16 bit ppm 10 Daily ROC integer 268 01 0B Oilmoisture 16 bit ppm 10 Weekly R
41. ce Port on page 39 3 Start the calibration sequence with the command h2 The transmitter starts outputting H2 measurement data h2 SSN b11 04rt 10432tn1x FW 3 85F MDN 104400 FFO02 P1 DF 0xB4B4v L 4 Stop the output by pressing the Esc key 7997 00 34 0852 50 11176 186 69 2654140 2652818 23 0 0 0 22 2649 0 0 wait lt ESC key gt H2scan 5 Save the H2 reading with the da command H2scan da Current H2 value is 14 4 ppm wait 6 When the H2 measurement output resumes exit the calibration sequence by pressing the key 79842 00 33 8725 50 11766 186 97 2654214 2652858 359 14 4 0 28 5654 200 200 wait lt key gt Quit hydrogen measurement module command line operation Do not exit the calibration sequence before the H2 measurement output has resumed If the H2 output does not resume automatically issue the command g to start the H2 output and then exit the calibration sequence Entering DGA H Reading to Transmitter Connection to the transmitter using Vaisala Industrial Protocol 4 in one of the following ways X o Service port see Connecting via Service Port on page 39 o RS 485 line of the screw terminals 77 9 Calibration and Adjustment 78 When you start the adjustment with the h2 command normal measurement stops temporarily and the transmitter goes into error state Measurement returns to normal when you exit the H2 calibration Open the connection on Vaisala Industrial Protocol
42. ces The port of the device is indicated next to the measured parameter You can change the shown parameters in Main menu gt Display gt Quantities and units a 0 100 a 0 101 4a 0 001 Graphic CE ET Figure 7 Example of MI70 Display with MHT410 in Port and MM70 Probe in Port II Shown Parameters aw I aw II A aw Changing the Rechargeable Battery Pack gt You can order a new rechargeable battery pack from Vaisala 1 Open the back plate of the indicator by opening the screw of the back plate 2 Remove the old battery pack Detach the black connector by gently pulling it up from the wires 3 Connect the black connector of the new battery pack Make sure the position of the connector is as shown in Figure 8 on the facing page red and black wires are on the upper edge of the connector Do not push the connector with conducting material 4 Place the battery pack close the back plate and tighten the screw 74 8 MI70 Hand Held Indicator 5 Recharge the indicator before use For more information see Installing and Recharging the MI70 Batteries on page 69 In case you are installing a battery pack and you have a device with alkaline batteries remove the metal contact before installing the battery pack Figure 8 Installing the Battery Pack 75 9 Calibration and Adjustment CALIBRATION AND ADJUSTMENT MHT410 is fully calibrated and adjusted as shipped from factory H2 Calibration an
43. ck the settings Serial Commands The notation lt cr gt refers to the carriage return control character which you can send in a terminal application by pressing enter on your keyboard Before entering commands senda lt cr gt to clear the command buffer You can enter the commands in uppercase or lowercase In the command examples the keyboard input by the user is in bold type 42 7 Vaisala Industrial Protocol Command Description Page Device information and status E Show device information 44 ee Show device information will respond in poll mode 44 alarm Show or set H2 alarm level 45 errlog Show error log records 46 errs Show active errors 47 help Show list of serial commands 48 system Show firmware information 48 time Show transmitter uptime time since last reset 48 vers Show the software version information 49 Serial line output and communication addr Show or set device address 55 close Close connection to device in POLL mode 55 This command cannot be used via the Service Port form Set output format of measurement messages 53 log Show measurement log reconds 50 intv Set measurement output interval 49 open Open connection to device in POLL mode 56 This command cannot be used via the Service Port r Start continuous output of measurement messages 52 sdelay Show or set serial line transmission delay 56 send Output one measurement
44. d form 002 6 0 H2 h2 U5 3 1 T t U3 3 1 RS rs U4 6 0 H20 h2o U5 4 3 aw aw 003 OK Output example continuous output in RUN mode H2 18 ppm T 45 0 C RS 10 0 H20 14 ppm aw 0 100 53 7 Vaisala Industrial Protocol Table 19 Output Parameters for Form Command Measurement Parameter Abbreviation in Form Command Relative saturation of water in oil RS rs Water activity in oil aw range 0 0 1 0 aw Water content in oil ppm h2o Hydrogen content in oil ppm One hour h2 average Oiltemperature C or F t Table 20 Modifiers for Form Command Modifier Description x y Length modifier number of digits and decimal places t Tabulator r Carriage return n Line feed ai String constant length 1 15 characters Xxx ASCII code value decimal of a special character for example 027 for ESC addr Transmitter address 0 254 date Uptime in days err Error code ASCII encoded hexadecimal notation sn Probe serial number time Uptime hh mm ss ux Name of the measurement unit using x number of characters 1 9 For example u3 shows the name of the measurement unit with three characters cs2 Modulus 256 checksum of message sent so far ASCII encoded hexadecimal notation cs4 Modulus 65536 checksum of message sent so far ASCII encoded hexadecimal notation CSX NMEA
45. d Adjustment You can calibrate MHT410 for H2 by comparing the H2 reading on the MHT410 to the H2 concentration of a laboratory analyzed DGA oil sample There is no need to remove the transmitter from the transformer to perform calibration and adjustment In the calibration procedure you take a DGA oil sample from the transformer and save the H2 concentration measured by the transmitter at that time When you have analyzed the H2 concentration of the sample you enter the analyzed H2 reading to MHT410 The transmitter then implements the adjustment to the H2 measurement Follow the instructions in sections Taking DGA Sample and Saving Current H2 Reading below and Entering DGA H2 Reading to Transmitter on page 78 Taking DGA Sample and Saving Current H2 Reading S Tools for taking a DGA oil sample X Connection to the transmitter using Vaisala Industrial Protocol G in one of the following ways o Service port see Connecting via Service Port on page 39 o RS 485 line of the screw terminals In the following instructions the keyboard input by the user is in bold type ED When you start the adjustment with the h2 command normal measurement stops temporarily and the transmitter goes into error state Measurement returns to normal when you exit the H2 calibration 76 9 Calibration and Adjustment 1 Take the DGA oil sample from the transformer 2 Open the connection on Vaisala Industrial Protocol see Connecting via Servi
46. ension aover AOVER OFF aover on AOVER ON For example channel 3 outputs temperature with output 4 20 mA 40 100 C After giving the aover on command the range is 4 21 6 mA 40 124 C Note that the 100 C point is still at 20 mA CURRENT OUTPUT 4 mA MEASURED VALUE Low end High end High end of scale of scale of scale 10 Analog output Analog output extended at high end of range OF sonls Figure 5 Analog Output Overrange Behavior 60 7 Vaisala Industrial Protocol Table 30 Asel Command Syntax Description asel lt cr gt Show analog output parameters and scaling and prompt to enter new scaling asel chl ch2 ch3 chllow Set analog output parameters and scaling chlhigh ch2low ch2high ch3low ch3high lt cr gt ch1 Output parameter for channel 1 rs relative saturation of water RS aw water activity range 0 0 1 0 h2o water content ppm h2 hydrogen content ppm t temperature C Q h2 Output parameter for channel 2 The ptions are the same as for channel 1 e Q h3 Output parameter for channel 3 The ptions are the same as for channel 1 e Q h1low Low limit for channel 1 output scaling Q hlhigh High limit for channel 1 output scaling ch2low Low limit for channel 2 output scaling Q h2high High limit for channel 2 output scaling ch3low Low limit for channel 3 output
47. ered with the Vaisala cable CBL210392 5M the cable is already pre connected to the transmitter according to Wiring Option 1 4 Installation Recommended Installation Locations The probe must always be installed in a valve Recommendation Description VOS Recommended Straight section in the radiator s outlet pipe This is the best location for the transmitter The oil is measured in flow which makes the oil sample representative and instant This is essential especially for correct oil moisture measurement Compared to the radiator inlet pipe oil in the outlet pipe is cooled preventing unnecessary heating of the sensors and the transmitter VO Possible alternative Side of the oil tank high enough from the bottom to enable proper oil movement An instrumentation valve is recommended with appropriate threads This is a typical valve that is meant for oil analysis Moisture response time is moderate depending on the oil volume and transmitter installation OA Severe risk of death and of damage to transformer Pay attention to transmitter installation depth and possible energized parts inside the power transformer to minimize electric shock hazard and equipment damage 0 Not recommended Drain valve of the oil tank The moisture response is poor due to static oil flow There is also risk of separated water leading to wrong results and oil sludge risk of sensor contaminati
48. fferent parameter The default display settings are presented in the Vaisala Technical Note inside the display package If needed configure the display functions and scaling 30 4 Installation according to the manufacturer s instructions delivered with the display Manufacturer s documentation is also available from www nokeval com For wiring instructions see Wiring the Display below Figure 1 Loop Powered Display 242003 The loop resistance of the display must be included in the loop resistance calculation for the complete current loop For the loop resistance of the display refer to the manufacturer s documentation Wiring the Display If one of the cable lead throughs on your transmitter is plugged and you want to use that lead through for the Nokeval display cable you can order a cable gland from Vaisala See Spare Parts and Accessories on page 87 Connect the loop powered display to the transmitter as shown in the following wiring diagram In the diagram the display is connected to Channel 1 according to Wiring Option 1 31 4 Installation 4 20 mA R 0 500 Q 15 30 VDC power supply for analog channel and display Figure 2 Example of Nokeval Display Wired to Channel 1 Transmitter Wiring According to Wiring Option 1 CD All the Wiring Options 1 2 3 and 4 have the same principle for connecting the display Wire from port 1 of the display connects to the minus port
49. g endian word order most significant word first In such case you must select word swapped floating point format in your Modbus master for MHT410 Modbus registers A quiet NaN value is returned for unavailable values A quiet NaN is for example 0x7FC00000 however the master should understand any NaN value A complete 32 bit floating point value should be read and written in a single Modbus transaction 16 Bit Integer Format 16 bit integer values are scaled to include the necessary decimals see corresponding register table for the scaling factor and represented as described in the following table Table 51 16 bit Signed Integer Format Details Value Description 0x0000 0x7FFE Value in range 0 32766 0x8002 0xF FFF Value in range 32766 1 2 s complement 0x8000 Value is not available quiet NaN D Some values may exceed the signed 16 bit range evenin normal operation To access such values use the floating point registers instead 98 B Appendix Modbus Reference Measurement Data Read Only Table 52 Modbus Measurement Data Registers Esglcal a ress Data Address hexa Register Description Format Unit decimal decimal 1 00 00 Ho 1 hour LSW 32 bit float ppm in oil 2 0001 average MSW 3 00 02 H2 24 hour LSW 32 bit float ppm in oil 4 00 03
50. g table Description Default value Serial bit rate 19200 Parity N Number of data bits 8 read only Number of stop bits 1 Modbus device address 240 You can change the Modbus settings using Vaisala Industrial Protocol For instructions see Serial Line Output and Communication on page 49 O The minimum time between requests from Modbus is 1 second 37 7 Vaisala Industrial Protocol VAISALA INDUSTRIAL PROTOCOL The transmitter provides an implementation of the Vaisala Industrial Protocol that can be used for service and configuration use or for interfacing with the system to which the transmitter is integrated The protocol is a plaintext protocol suitable for use both by human operators and automated systems You can access the Vaisala Industrial Protocol in two ways For permanent connection use the RS 485 line of the screw terminals For temporary connection with a computer use the service port See Connecting via Service Port on the facing page You can use Vaisala Industrial Protocol via the RS 485 line of the screw terminals and the service port at the same time However the transmitter responds to the commands one ata time from either line which may result in delayed responses if a command is entered from one line while another command is in progress on the other line Table 4 Default Serial Interface Settings Property Description Value Baud rate 19200
51. ge 94 A Appendix Operating Principle Table 48 Optimal Sensor Locations Valve in Radiator Pipe Valve in Transformer Wall Moisture and temperature sensorsare Tip of the probe is level with transformer directly in the oil flow This is because inner wall No part of the probe must enter water molecule diffusion rate in oilis the transformer chamber All sensors slow and therefore moisture must be remain within the valve area measured in moving oil Hydrogen sensor is in the valve area This is because the hydrogen sensor needs an accurate temperature control and therefore hydrogen must be measured in still oil Severe risk of death and of damage to transformer Pay attention to transmitter installation depth and possible energized parts inside the power transformer to minimize electric shock hazard and equipment damage Method Used for Measuring Moisture in Oil MHT410 measures water in oil in terms of relative saturation RS which can be determined as follows relative saturation indicates the amount of water oil in the scale of 0 100 RS In this scale 0 RS is an indication of completely water free oil and 100 RS an indication of oil fully saturated with water Water is present in free form The most advanced feature which distinguishes the measurement of relative saturation RS from the traditional measurement of absolute water content in ppm is that the saturation point rema
52. ger limit 1500 ppm hihi Input 4 20 mA loop powered Accuracy 0 05 of span 10 60 C 2 x solid state SSR Max 250 VAC 150 mA Display 4 digit red LED 14 5mm Dimensions 100 x 100 x57 mm WHD Case protection IP65 Case material and color ABS plastic grey Cable glands 2xM16x1 5 Spare Parts and Accessories Part number Description 219690 USB cable for PC connection 242422 External DIN rail power 100 240 VAC to 24 VDC CBL210392 5MSP 5 meter shielded PUR cable CBL210392 10MSP 10 meter shielded PUR cable 214728SP Cable gland 236620SP Detachable screw terminal block 242003 Loop powered external display Nokeval 302 with alarm relays 219980 MI70 connection cable 214780SP Conduit fitting 87 11 Technical Data Dimensions Cable 8 11 mm 88 11 Technical Data Wiring Diagrams P ANALOG OUTPUTS 9 3 SHLD RS 485 2 fo A 11 12 13 POWER J 0O OOOO gt CH o cH N CH1 CH1 gt 4 20 MA 4 20 MA i R 0 500 Q R 0 500 Q 15 30 VDC 15 30 VDC 15 30 VDC loop powered loop powered loop powered Power supply 15 30 VDC Or 24 VAC 15 Figure 9 Wiring Option 1 Separate Loop Powering and Galvanic Isolation for Analog Outputs In tra
53. he battery Typical duration is 4 hours The recommended first recharging time is 6 hours 3 When the battery symbol stops rolling disconnect the charger 69 8 MI70 Hand Held Indicator A It is not recommended to use MI70 during the first recharging Later on MI70 can be used while recharging Connecting MI70 to Service Port MI70 Indicator or MM70 Moisture Meter includes MI70 A indicator a moisture in oil probe and a ball valve Connection cable Vaisala order code 219980 Power supply for MHT410 1 Open the screws on the transmitter cover and open the cover 2 Connect the cable 219980 to the service port connector on the transmitter and to port I or Il of MIZO indicator 3 Switch the MI70 indicator on Holding and Saving the Display With the Hold Save function you can freeze a certain display reading This reading can be saved in the MI70 memory and it will be available even after MI70 is disconnected from the transmitter To save a display 1 Inthe basic display select Hold Save Alternatively select Main menu gt Display gt Hold Save display gt Hold 2 Press Save To view the saved display 1 Inthe basic display select Record gt View recoded data Alternatively select Main menu gt Recording Viewing gt View recoded data A list of saved displays and data recordings appears The icons on the left of the date and time indicate whether the file is a saved display or a longer rec
54. ical Data on page 84 CEOA amp Trademarks HUMICAP is a registered trademark of Vaisala Oyj All other trademarks are the property of their respective owners 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 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 exceptional operating conditions negligent handling or installation or unauthorized modifications Please see the applicable supply contract or Conditions of Sale for details of the warranty for each product 3 Product Overview PRODUCT OVERVIEW Vaisala Moisture Hydrogen and Temperature Transmitter MHT410 for Transformer Oil is designed for online monitoring ofinsulating oil in power transformers The transmitter provides an accurate real time measurement result of moisture hydrogen and temperature measured in oil enabling reliable conclusions on the transformer s condition without delay The transmitter provides digital and analog outputs of all the measured parameters 10 3 Product Overview Product Parts and Package Contents B
55. ing PTFE 8 Tightening nut EN 1 4404 9 Mounting nut EN 1 4404 10 Filter EN 1 4404 11 Circuit board cover Polypropylene 12 Terminal blocks Polyamide PA66 13 Grounding cable Copper wire 14 Plug for cable lead through Polystyrol 15 Cable gland Nickel plated brass 16 Weather shield EN 1 4404 17 Sorbent packet Silica 18 Thread cap LDPE Screws A4 92 11 Technical Data 17 18 16 13 14 15 12 11 93 A Appendix Operating Principle APPENDIX OPERATING PRINCIPLE Power transformers are critical components in the electric grid Age increased load levels and network failures all take a toll on transformers increasing the risk of unpredicted faults and outages Hydrogen levels and their rate of change indicate the severity of a fault situation Moisture has a direct impact on the lifetime of a transformer Oil moisture has a significant effect on transformer cellulose condition and the oil s ability to insulate These changes in moisture levels can occur rapidly Continuously monitoring hydrogen and moisture levels with an in situ probe is the first step in extending the life of a transformer through implementation of predictive maintenance practices leading to lower total cost of ownership Figure 13 Measuring Hydrogen and Moisture in Oil with MHT410 The optimal locations for the MHT410 hydrogen moisture and temperature sensors are presented in Table 48 on the facing pa
56. ins stable regardless of the oil type aging of oil or additives used As relative saturation exceeds 90 RS in any system there is a risk for segregation especially if the temperature decreases The relative saturation is used for alarming at the point of gt 90 RS that the risk for free water in the system is obvious The most important advantages of this system are the fact that relative saturation is immune to the aging of oil and to additives and that the MHT410 transmitter can be used for continuous on line measurements Transformer Oil The determination of moisture in oil is an essential part of a comprehensive transformer maintenance program Aging and deterioration increase the 95 A Appendix Operating Principle capacity of oil to absorb water The primary interest in transformers is to measure the water not in oil but in the cellulosic insulation around the transformer windings The MHT410 method provides for a reliable detection of the aging of oil and possible leakages Moisture level in oil is a true indicator of moisture present in the paper insulation Heating and cooling have a considerable effect on moisture levels in oil The paper insulation around the transformer windings tends to lose moisture as temperature rises This moisture is absorbed by the oil surrounding it Oil immersed transformers rely on the oil for cooling protection from corrosion and as an important component of their insulation Excessive mo
57. isture content in oil causes accelerated aging of the insulation materials and reduces their dielectric strength In extreme cases this can result in arcing and short circuits within the windings Accurate moisture measurements can also warn about leaks in the oil system as water is absorbed from the surrounding air The water solubility of oil is also temperature dependent In general water solubility increases as temperature rises see Figure 14 below WATER SOLUBILITY IN MINERAL TRANSFORMER OIL 10000 average water solubility range of variation due to oil type range of variation due to oil type Temperature C Figure 14 Water Solubility of Transformer Oils versus Temperature The margins show the range of variation of water solubility found in mineral oils In addition it must be noted that the capacity of oil to absorb water depends both on the chemical structure of the oil and the additives 96 B Appendix Modbus Reference APPENDIX MODBUS REFERENCE Function Codes Conformance class 0 function codes are enough to access the measurement data and configuration settings of MHT410 Device identification data can be read out only with the function code dedicated for that purpose 43 14 Table 49 Supported Function Codes Function Name Class Notes Code 03 0x03 Read Holding Registe
58. iver on your computer requires Windows When installing the driver you must accept any security prompts that may appear 1 Check that 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 latest driver from www vaisala com software 39 7 Vaisala Industrial Protocol 3 Run 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 a USB port on your computer 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 individual service cable as a different device and reserve a new COM port Remember to use the correct port in the settings of your terminal program Terminal Application Settings The steps below describe how to connect to the transmitter using the PUTTY terminal application for Windows available for download at www vaisala com software and a USB service cable 1 Make sure the USB service cable is connected to your PC and the service port of the transmitter 2 Start the PuTTY application 40 7 Vaisa
59. l mode STOP Baud F DS 19200 N 8 1 Output interval de Serial delay 25 Address 0 Filter 1 000 Chl output 4 20 mA Ch2 output 4 20 mA Ch3 output 4 20 mA Chl RS lo 0 00 Chl RS hi 100 00 Ch2 T lo 40 00 Ch2 T hi 100 00 C Ch3 H2 lo 0 00 ppm 5000 00 ppm Syntax Description lt cr gt Show listing of device information SIGES Show listing of device information when device is in poll mode and connection has not been opened using the open command Example 44 7 Vaisala Industrial Protocol Table 7 Alarm Command Syntax Description alarm lt cr gt Checkthe status and setpoint ppm ofthe hydrogen alarm The alarm is activated when the 1 hour average for hydrogen exceeds the setpoint alarm on off setpoint lt cr gt Set the hydrogen alarm status on Alarm indication is on off Alarm indication is off setpoint Hydrogen level above which the alarm is activated Example check the hydrogen alarm status alarm is off alarm Alarm display OFF Setpoint ppm 300 Example enable the hydrogen alarm and set the alarm limit to 200 ppm hydrogen alarm on 200 Alarm display ON Setpoint ppm 200 45 7 Vaisala Industrial Protocol Table 8 Errlog Command Syntax Description errlog print lt cr gt errlog print n i lt cr gt errlog save lt cr gt Show the error log with max 25 last log entries The error l
60. la Industrial Protocol 3 Select Connection gt Serial amp USB and check that the correct COM port is selected in the Serial or USB line to connect to field If you are using the PuTTY terminal application supplied by Vaisala you can click the USB Finder button to open the Vaisala USB Instrument Finder program iX PuTTY Configuration Options controlling local serial and USB lines Select a serial USB line Serial or USB line to connect to COM3 USB Finder H E Configure the seral USB line Serial amp USB Speed baud Data bits Stop bits Parity How control Figure 4 PuTTY Terminal Application 41 7 Vaisala Industrial Protocol 4 Check thatthe other serial settings are correct and change if necessary Table 5 Service Port Serial Interface Settings Property Value Baudrate 19200 Parity None Data bits 8 Stop bits 1 Flow control None 5 Select Terminal Use the following settings o Local Echo Force on This setting ensures that your typing is shown on the session window o Send line ends with line feeds CR LF Selected This setting ensures that all text lines remain visible on the session window 6 Click the Open button to open the connection window and start using the serial line If PUTTY is unable to open the serial port you selected it will show you an error message instead If this happens restart PuTTY and che
61. llowing events are logged 13 3 Product Overview Hydrogen ppm moisture in oil RS and ppm and temperature C readings as 24 h averages 1 h averages or instant values Power outages o Short power outages that do not turn off transmitter power flagged as U PS o Long power outages that turn off transmitter power flagged first as UPS and then as Reset Manual resets flagged as Reset Uptime and total operating time Occasions of exceeding hydrogen alarm level optional You can view the log and change the logging settings via the Vaisala industrial protocol See Vaisala Industrial Protocol on page 38 and Log Command on page 50 You can save the log as a file from PuTTY by configuring the following settings in PUTTY before opening the connection In the Session gt Logging view Session logging Select Printable output Logfile name Type a name for the log file use the file extension txt and browse for the location where to save the file To prevent the log from getting very long consider saving and then clearing the log every few years Status LEDs When the transmitter is ON one of the LEDs is always illuminated steady or blinking If no LED is illuminated the transmitter is OFF LED Color and Text Description Green blinking Transmitter is preparing H measurement after start up or reset amp Wait Green steady Transmitter is measuring
62. lter ON gt OFF Table 16 R Command Syntax Description r lt cr gt Startthe continuous outputting of measurement values as an ASCII text string to the serial line The probe keeps outputting measurement messages at the interval that has been set with the intv command until stopped with the s command Example r T 45 1 C RS 10 0 H20 13 9 ppm aw 0 100 H2 17 ppm T 45 0 C RS 10 0 H20 13 9 ppm aw 0 100 H2 17 ppm T 45 0 C RS 10 0 H20 13 9 ppm aw 0 100 H2 17 ppm T 45 1 C RS 10 0 H20 13 9 ppm aw 0 100 H2 17 ppm T 45 1 C RS 10 0 H20 13 9 ppm aw 0 100 H2 18 ppm T 45 1 C RS 10 0 H20 13 9 ppm aw 0 100 H2 18 ppm T 45 1 C RS 10 0 H20 13 9 ppm aw 0 100 H2 18 ppm T 45 2 C RS 10 0 H20 13 9 ppm aw 0 100 H2 18 ppm Table 17 Send Command Syntax Description send lt cr gt Output a single measurement message The output uses the format defined with the formcommand send aaa lt cr gt Output a single measurement message when the transmitter is in poll mode and connection has not been opened using the open command aaa Address of the transmitter range 0 255 Set with the addr command send ROC lt cr gt Output the rate of change readings for H and H O daily weekly and monthly ROC for each parameter Example transmitter in stop mode no address needed send T 45 1 C RS 10 0 H20 13 9 ppm aw 0 100 H2 17 ppm Example t
63. module H2 AIS 1 Connect using Vaisala Industrial measurement protocol error 2 Open the connection to H module by giving the command h2 3 Verify whether the transmitter starts pape No message Was received outputting H measurement data from H2 module in the last H2 module communication error 5 seconds 4 Close the connection to H module by pressing the key Contact Vaisala technical support see Technical Support on page 83 0010 Capacitance value is Remove the transmitter from the outside the allowed range transformer and visually check the integrity RH sensor fail of the transmitter and the sensor area of ae the probe body Contact Vaisala technical support see Technical Support on page 83 0020 Measured temperature is Ensure that the operating temperature is outside the error limits within the valid range 40 120 C Temperature below 45 C or above too high low If the error persists contact Vaisala 125 C technical support see Technical Support on page 83 81 10 Troubleshooting Error Number and Text Description Action 0040 Program flash CRC error 0080 Parameter flash check sum error 0100 INFOA check sum error 0200 SCOEFS check sum error 0400 CURRENT check sum error 0800 DEFAULT factory check sum error 1000 General flash failure W R Internal transmitter failure Contact Vaisal
64. nsmitters ordered with Vaisala cable CBL210392 5M the cable is pre wired according to this option Table 46 Vaisala Cable CBL210392 5M Wire Colors When Pre Wired Terminal Wire Color CH3 Green CH3 White Green CH2 White CH2 Gray White CH1 Yellow CH1 White Yellow RSGND Purple D Black D Yellow Brown V Red Vs Blue 11 Technical Data er CH2 6 SJ I cH ANALOG OUTPUTS CH1 9 M RS 485 7 3 SHLD RS gt GND 1 Qa a 1213 20060606 A POWER s o 7 16 E SHLD on V 1 3 gt G G y 4 20 MA R 0 500 Q 15 30 VDC loop powered Power supply 15 30 VDC Or 24 VAC 15 Figure 10 Wiring Option 2 Common Loop Powering And Galvanic Isolation for Analog Outputs P CH3 N CH3 gt cH2 gt cH1 3 en CH2 ANALOG OUTPUTS CH1 RS 485 4 3 SHLD RS gt GND D D N wo mn O 7 F POWER s gt 16 B SHLD on V T Power suppl 15 30 VD Figure 11 Wiring Option 3 Non lsolated Configuration for Analog Outputs Sharing Transmitter Power Supply 90 11 Technical Data ANALOG OUTPUTS M RS 485 TPOWER
65. og stores the error status each time the status changes You can save the error log as a file from PuTTY by configuring the following settings in PUTTY before opening the connection In the Session gt Logging window Session logging Select Printable output Log file name Type aname for the log file use extension txt and browse for the location where to save the file Show the error log with a chosen number of entries n Number of entries to show max 9 999 i Optional Index number of the first shown entry If this parameter is not used the list will show the last n number of entries Save the current error status for troubleshooting purposes errlog clear lt cr gt Remove all entries from the error log Clearing the error log may make troubleshooting more difficult later if a problem occurs 46 7 Vaisala Industrial Protocol Syntax Description Example show error log errlog print index RecNum Reset Days Time ERRS H2err cl 1 1 0 00 00 8 0 2 2 2 0 00 37 8 0 3 3 2 0 00 37 0 0 4 4 2 0 00 38 8 0 5 5 2 0 01 10 0 0 6 6 2 0 01 15 8 0 7 7 3 0 00 36 2 0 Example show the last 5 entries errlog print 5 index RecNum Reset Days Time ERRS H2err 27 27 19 0 04 59 8 0 28 28 19 0 05 11 0 0 29 29 19 0 05 18 8 0 30 30 19 0 05 21 0 0 31 31 19 0 05 22 8 0 Example save the current error status errlog save New value stored Example remove all ent
66. on and clogged filters 19 4 Installation Mechanical Installation Before you install the transmitter make sure there is no negative pressure in the transformer If there is negative pressure when you open the bleed screw during installation air will be sucked into the transformer oil tank 1 Remove the protective cap with sorbent packet from the mounting nut In case of rain do not let any water fall on the filter 20 4 Installation 2 Apply PTFE tape tightly on the mounting nut threads o Before you start clean the threads with a cloth o Start wrapping from the third thread on the tip of the mounting nut and apply a few loops inwards o Wrap the tape in the opposite direction to the tightening direction of the nut In other words wrap the tape along the threads o Wrap each loop about half way on top of the previous loop so that the loops overlap VAISALA 21 4 Installation 3 Fasten the mounting nut on the ball valve with your hand Then tighten the mounting nut with a wrench Leave the bleed screw directly on top ofthe nut Always make sure the bleed screw is closed before you turn the mounting nut with a wrench 22 4 Installation 4 With a 3 mm Allen key loosen the bleed screw Place a bucket under the mounting nut OPEN max 3 x 360 5 a Start opening the valve very carefully to let air out through the bleed screw A If you
67. ording of data E Oo Saved display Data recording 70 8 MI70 Hand Held Indicator 2 Select the saved display based on date and time by pressing the right arrow key DATA FILES 3 filets egh17 4 2015 10 05 00 16 4 2015 10 37 3 16 4 2015 10 25 DELETE INFO EXIT Recording Data With MI70 you can record transmitter measurement data over a certain period at chosen intervals These recordings are saved in MI70 memory and are available even after MI70 is disconnected from the transmitter Starting and Stopping the Recording You can record the measurement of the parameters that are currently shown on the MI70 basic display You can change the shown parameters in Main menu gt Display gt Quantities and units 1 In the basic display select Record gt Record data Alternatively select Main menu gt Recording Viewing gt Record data 2 needed change the interval and duration of the recording in the RECORD DATA view The measurement intervals and maximum recording times are shown in Table 38 on the next page If you set the duration to Memory full the recoding will continue until the MI70 memory is full or until you stop the recording manually The maximum recording time will be shown when you start the recording 71 8 MI70 Hand Held Indicator 3 Select Start Stop recording gt Start The recording will continue until the duration has passed or until you stop the recording manually You
68. ransmitter in poll mode with address 10 send 10 T 45 1 C RS 10 0 H20 13 9 ppm aw 0 100 H2 17 ppm 52 7 Vaisala Industrial Protocol Measurement Output Format Table 18 Form Command Syntax Description form lt cr gt Show the currently used measurement format form lt cr gt Reset measurement format to default form sss lt cr gt Set anew measurement format sss String consisting of modifiers and abbreviations for measured parameters See Table 19 on the next page and Table 20 on the next page Maximum length is 150 characters Maximum length may be shorter when text strings are used Example show currently used measurement format default format shown here form 3 1 T t U3 3 1 RS rs U4 6 1 H20 h20 U5 4 3 aw aw 6 0 H2 h2 U5 r n Output example continuous output in RUN mode T 45 0 C RS 10 0 H20 13 9 ppm aw 0 100 H2 18 ppm Example change the order of the output to show H first with Modulus 65536 checksum at the end form 6 0 H2 h2 05 3 1 T t U3 3 1 RS rs U4 6 1 H20 h20 U5 4 3 aw aw cs4 r fin OK Output example continuous output in RUN mode H2 18 ppm T 45 0 C RS 10 0 H20 13 9 ppm aw Oa 0E22 Example show H20 in ppm without decimals with start of text ASCII character 002 and end of text 003 ASCII codes and without line feed and carriage return at the en
69. re version for example 1 2 3 3 03 VendorUrl http www vaisala com 04 ProductName Vaisala Moisture Hydrogen and Temperature Transmitter MHT 410 for Transformer Oil 128 80 SerialNumber Transmitter serial number for example KO710040 129 81 Calibration date Date of the factory calibration 130 82 Calibration text Information text of the factory calibration Object numbers above 127 are Vaisala specific device information objects Exception Responses Table 56 MHT410Modbus Exception Responses Code Name Reason 01 ILLEGAL FUNCTION Unsupported function code 02 ILLEGAL DATAADDRESS Address out of valid ranges 03 ILLEGAL DATA VALUE Otherwise invalid request Accessing unavailable unsupported or temporarily missing measurement data does not generate an exception Unavailable value a quiet NaN for floating point data or 0x0000 for integer data is returned instead An exception is generated only for any access outside the register blocks defined in Table 50 on page 97 102 C Appendix Moisture PPM Calculation for Transformer Oils APPENDIX MOISTURE PPM CALCULATION FOR TRANSFORMER OILS Traditionally moisture in transformer oil is measured in ppm units The ppm output shows the average mass concentration of water in oil MHT410 has an option for ppm output Calculation Model with Average Coefficients The calculation model of MHT410 is based on the average water solubility beha
70. ries from the error log errlog clear Erase all Error Log data Y N y Erasing Error Log cleared Table 9 Errs Command Syntax Description errs lt cr gt Show currently active errors The possible errors and their remedies are listed in Possible Error Messages via Vaisala Industrial Protocol on page 80 Example no errors active errs No errors 47 7 Vaisala Industrial Protocol Table 10 Help Command Syntax Description help lt cr gt Show a list of available commands Example help Stop mode commands ADDR AERR ALARM AOVER ASEL ATEST CDATE CLOSE CTEXT ERRLOG ERRS FILT FORM FRESTORE H2 HELP INTV LOG R RESET SDELAY SEND SERI SMODE SYSTEM TIME UNIT VERS Poll mode commands OPEN SEND ar Table 11 System Command Syntax Description system lt cr gt Show firmware information Example system Device Name MHT410 Copyright Copyright c Vaisala Oyj 2015 All rights reserved SW Name MHP410 SW date 2015 03 31 SW version 10 1520 OS version H TSF sO Table 12 Time Command Syntax Description time mode lt cr gt Show transmitter uptime time since last reset Default output hh mm ss mode alternative output option optional m 1 include days dddd hh mm ss m 2 include decimals of seconds hh mmiss sss 3 include days and decimals of seconds 4 include total operating time Example show transmitter uptime in hh mm ss
71. rs Class 0 See Measurement Data Read Only on page 99 for available registers 43 14 Read Device Identification See Device Identification 0x2B Ox0E Objects on page 102 for available device identification objects Register Map All data available via the Modbus interface is grouped in three contiguous blocks of registers as described in Table 50 below Table 50 MHT410 Modbus Register Blocks Logical Address decimal Data Format Description 1 54 32 bit IEEE float Measurement data read 257 271 16 bit signed integer only 513 513 16 bit signed integer Status registers read only The addresses are 1 based decimal Modbus data model addresses Subtract 1 to get address field values used in Modbus Protocol Data Unit PDU The register map is the same for all Modbus function codes For example function codes 03 and 04 return exactly same result 97 B Appendix Modbus Reference Data Encoding All numeric values are available both in 32 bit IEEE floating point and 16 bit signed integer formats 32 Bit Floating Point Format Floating point values are represented in standard IEEE 32 bit floating point format Least significant 16 bits of floating point numbers are placed at the smaller Modbus address as specified in Open Modbus TCP Specification Release 1 0 This is also known as little endian or Modicon word order a Despite the specification some Modbus masters may expect bi
72. stallation 2 Hold the upper nut of the cable gland in place with a wrench 24 mm and loosen the sealing nut of the gland with another wrench 24 mm 28 4 Installation 3 Lead the cable through the sealing nut and the rubber seal Turn the shield over the edge of the rubber seal 4 Lead the cable through the cable gland Push the rubber seal back in place with the shield Cut off any excess shield Tighten the sealing nut with wrench 24 mm 29 4 Installation 5 Pull the screw terminal blocks 2 pcs off from the circuit board 6 Connect the wiring to the detachable screw terminals according to your chosen electrical installation option The options are presented in Wiring Diagrams on page 89 Note that wiring for digital output RS 485 is the same in all wiring options 7 When you are finished with the wiring plug the screw terminals back in and close the electronics housing Loop Powered Display The analog outputs of the transmitter can be connected to an external loop powered LED display order code 242003 The display is a pre configured Nokeval 302 display intended for Vaisala MHT410 hydrogen channel measurements The display also includes two alarm relays to trigger an external hydrogen warning and alarm This display can be configured for other parameters moisture temperature in oil If needed you can install up to three displays each showing a di
73. t cover and disconnect the wires from the detachable screw terminals 33 4 Installation b Hold the upper nut of the cable gland in place with a wrench 24 mm and loosen the sealing nut of the gland with another wrench 24 mm c Pull the cable out of the cable gland d Re attach the cable gland in its place Puta bucket under the ball valve to catch any oil falling from the valve Loosen the small tightening nut with a wrench ED To keep the larger mounting nut from opening hold itin place with a wrench as you are opening the smaller tightening nut 4 Pull the transmitter outward so thatthe probe body is out of the ball valve Close the ball valve 6 Open the mounting nut with a wrench and pull the transmitter out Use the cloth to clean up any spills a A Always make sure the bleed screw is closed before you turn the mounting nut with a wrench 34 5 Analog Output ANALOG OUTPUT There are three analog output channels available for H2 moisture in oil and temperature using 4 20 mA current outputs The parameter for each output is configured at the factory according to order If needed you can change the parameters using Vaisala Industrial Protocol For instructions see table Asel Command on page 61 Table 3 Analog Output Values in Different Transmitter Statuses Transmitter Status Analog Output Value Normal 4 20 MA Error 3 5 mA default Measurement not ready 3 0 mA
74. very few years log print n i lt cr gt Show the measurement log with a chosen number of entries n Number of entries to show max 32767 i Optional Index number of the first shown entry If this parameter is not used the list will show the last n number of entries log alarm on off lt cr gt Enable or disable storing a log item when the H concentration 1 hour average exceeds the alarm level Logging continues once an hour until the H level returns below the alarm limit or until alarm logging is disabled The log entries contain the additional tag H2alarm You set the H alarm level using the alarm command see Table 7 on page 45 50 7 Vaisala Industrial Protocol Syntax Description hog ELLE on off lt cr gt Enable or disable the filtering of measurement values in the log on For each parameter the 24 h average value is stored The log entries contain the additional tag F off For H 1 h average is stored For RS and T instant values are stored log save lt cr gt log clear lt cr gt Save the current measurement values in the log The log entry contains the additional tag 12h Tst Remove all entries from the measurement log Example show up to 100 last entries in the log log print index Reset Days Uptime Total Time RS H20 ppm Temp C H2 ppm Flags 1 2 0 00 08 O 00 17 10 000 13 900 45 406 18 0 12h Tst 2 2 0 0
75. vior of transformer oils The ppm output is calculated as follows ppm aw x 10 A T 273 16 8 Where aw water activity A B coefficients average oil specific T temperature C Generally moisture in oil measurement with MHT410 has an accuracy of 2 3 of the reading If additional accuracy is needed see Calculation Model with Oil Specific Coefficients below Calculation Model with Oil Specific Coefficients For additional accuracy an oil specific calculation model can be used An oil sample has to be sent to Vaisala for modeling As a result the specific coefficients A and B see formula in Calculation Model with Average Coefficients above for the transformer oil are determined by Vaisala Using these coefficients increases measurement accuracy The determined coefficients of the transformer oil can be programmed to the MHT410 by Vaisala 103 www vaisala com M21173 7 EN

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