USER'S GUIDE Vaisala HUMICAP® Moisture and Temperature Transmitter for Oil MMT162 M210934EN-C
PUBLISHED BY Vaisala Oyj P.O. Box 26 FI-00421 Helsinki Finland Phone (int.): +358 9 8949 1 Fax: +358 9 8949 2227 Visit our Internet pages at www.vaisala.com © Vaisala 2013 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.
________________________________________________________________________________ Table of Contents CHAPTER 1 GENERAL INFORMATION ............................................................................ 5 About This Manual ................................................................... 5 Contents of This Manual ....................................................... 5 Version Information ............................................................... 6 Related Manuals ..............................
User's Guide ______________________________________________________________________ Show Firmware Version ...................................................... 27 Configuring Serial Line Operation ........................................ 28 Set Serial Line Settings ....................................................... 28 Set Serial Line Response Time ........................................... 29 Set Transmitter Address ...................................................... 29 Format Measurement Output .
________________________________________________________________________________ CRH ............................................................................... 52 Using MI70 .......................................................................... 53 One-Point Temperature Adjustment .................................... 56 Using Serial Line ................................................................. 56 Using MI70 ..........................................................................
User's Guide ______________________________________________________________________ List of Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Moisture and Temperature Transmitter for Oil MMT162 .......... 11 Water Solubility of Transformer Oils versus Temperature ....... 14 Removing the Transportation Protection Cap .......................... 15 Installing the Transmitter ..............................................
Chapter 1 ________________________________________________________ General Information CHAPTER 1 GENERAL INFORMATION This chapter provides general notes for the manual and the product. About This Manual This manual provides information for installing, operating, and maintaining Vaisala HUMICAP® Moisture and Temperature Transmitter for Oil MMT162.
User's Guide ______________________________________________________________________ Version Information Table 1 Manual Code M210934EN-C M210934EN-B Manual Revisions Description April 2013. This manual. Updated descriptions of connection cables and serial line commands. Updated list of spare parts and accessories. March 2009. Previous version. Updated cable specification.
Chapter 1 ________________________________________________________ General Information Safety The Vaisala HUMICAP® Moisture and Temperature Transmitter for Oil MMT162 delivered to you has been tested for safety and approved as shipped from the factory. Note the following precautions: WARNING Ground the product, and verify outdoor installation grounding periodically to minimize shock hazard. CAUTION Do not modify the unit. Improper modification can damage the product or lead to malfunction.
User's Guide ______________________________________________________________________ Trademarks HUMICAP® is a registered trademark of Vaisala Oyj. Windows® is a registered trademark of Microsoft Corporation in the United States and/or other countries. License Agreement All rights to any software are held by Vaisala or third parties. The customer is allowed to use the software only to the extent that is provided by the applicable supply contract or Software License Agreement.
Chapter 2 __________________________________________________________ Product Overview CHAPTER 2 PRODUCT OVERVIEW This chapter introduces the features, advantages, and the product nomenclature of Moisture and Temperature Transmitter for Oil MMT162. Introduction to MMT162 The MMT162 transmitter is a microprocessor based instrument for the measurement of moisture in terms of water activity, for example in the lubrication of circulation systems or in transformer oil.
User's Guide ______________________________________________________________________ Basic Features and Options - Two analog outputs - Digital output: RS-485 - USB connectivity for service connections via the optional USB M8 cable - Different cable lengths available - Available with two different thread options: ISO G1/2" and NPT 1/2" - Low maintenance requirements due to excellent long term stability - LED cable option that enables a visual alarm function - Field calibration possible with MM70 - Two filter
Chapter 2 __________________________________________________________ Product Overview Transmitter Structure The structure of the MMT162 is shown in Figure 1 on page 11. The transmitter body does not have user serviceable parts inside, and is not designed to be opened. Opening the transmitter will void the warranty. When the transmitter is delivered, the filter is protected by a yellow transport protection cap. Remove the transport protection cap before installing the transmitter.
User's Guide ______________________________________________________________________ Typical Applications Method Used for Measuring Moisture in Oil The MMT162 transmitter measures water in oil in terms of water activity (aw) which can be determined as follows: water activity indicates the amount of water on the scale of 0 - 1 aw. In this scale, 0 aw is an indication of completely water free oil and 1 aw an indication of oil fully saturated with water. Water is present in free form.
Chapter 2 __________________________________________________________ Product Overview It is essential to monitor the water content and to keep it on a suitable level, meaning below saturation. When measuring the water content of oil, it is best to measure the water activity before an oil reservoir and from a pressure line flow. This way the performance of dehumidifiers can be kept under control to ensure that no free water reaches the bearings.
User's Guide ______________________________________________________________________ WATER SOLUBILITY IN MINERAL TRANSFORMER OIL 10000 1000 average water solubility range of variation due to oil type range of variation due to oil type 100 10 0 10 20 30 40 50 60 70 80 90 100 Temperature (°C) 0510-029 Figure 2 Water Solubility of Transformer Oils versus Temperature The margins show the range of variation of water solubility found in mineral oils.
Chapter 3 _______________________________________________________________ Installation CHAPTER 3 INSTALLATION This chapter provides you with information that is intended to help you install the product. Installing the Transmitter After selecting a suitable measurement location, follow the procedure below to install the transmitter: 1. Remove the yellow transport protection cap from the transmitter. 0805-005 Figure 3 2. 3.
User's Guide ______________________________________________________________________ 0805-006 Figure 4 4. CAUTION Installing the Transmitter Use a 30 mm wrench to tighten the connection to 25 Nm, as shown in Figure 4 above. If you do not have a 30 mm wrench, use a 1 3/16” wrench or an adjustable wrench instead. Only tighten the probe from the 30 mm nut. Do NOT apply force to other points in the probe body. 5. Connect the wires of the connection cable. 0710-130 Figure 5 Connecting the Cable 6.
Chapter 3 _______________________________________________________________ Installation Wiring Pin 1 2 3 4 I Vcc Analog output 1 GND Analog output 2 / LED II Vcc RS-485 B / DGND RS-485 A / D+ Wire Color Brown White Blue Black 0707-035 Figure 6 Connectors I and II 1210-005 Figure 7 Connector Pinout VAISALA _______________________________________________________________________ 17
User's Guide ______________________________________________________________________ Connection Cables The following connection cable options are available for MMT162: - Shielded cables with M8 female straight threaded connector Cables with M8 female 90° angle threaded connector LED cable USB serial interface cable The figures below show the different cable options that are available. For order codes, see section Spare Parts and Accessories on page 61.
Chapter 3 _______________________________________________________________ Installation 1211-025 Figure 10 LED Cable 1210-062 Figure 11 USB Serial Interface Cable Power Supply Requirements The MMT162 transmitters are designed to operate with a supply voltage of 14 … 24 VDC. The power supply should maintain the voltage for all load conditions. Current consumption during normal measurement is 20 mA + load current. For more specific information, see chapter Technical data on page 59.
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Chapter 4 ________________________________________________________________ Operation CHAPTER 4 OPERATION This chapter contains information that is needed to operate this product. Getting Started MMT162 is ready to be used once it has been connected to a power source. Analog Output Operation Modes The MMT162 has two analog output channels. These channels can function in two different modes, which can be set individually for both channels: 1. 2.
User's Guide ______________________________________________________________________ Limit Alarm The limit alarm is activated when the measured parameter goes below the low limit, or above the high limit. The alarm levels and limits are configurable using the ALARM command (see page 35). By default, the alarm levels are set as follows: - For current output, an active alarm is indicated by the current being at the maximum of the scale (20 mA).
Chapter 4 ________________________________________________________________ Operation Table 4 Property Baud rate Parity Data bits Stop bits Default Serial Interface Settings Description / Value 19200 none 8 1 Installing the Driver for the USB Cable Before taking the USB cable into use, you must install the provided USB driver on your PC. 1. 2. 3. 4. 5. Check that the USB cable is not connected. Disconnect the cable if you have already connected it.
User's Guide ______________________________________________________________________ Terminal Program Settings The default settings of the MMT162 serial interface are presented in Table 4 on page 23. If the settings of your MMT162 have been changed and you do not know what they are, refer to section Unknown Serial Settings on page 49. The steps below describe how to connect to the MMT162 using the PuTTY terminal application for Windows (available for download at www.vaisala.
Chapter 4 ________________________________________________________________ Operation 0807-004 Figure 12 PuTTY Terminal Application VAISALA _______________________________________________________________________ 25
User's Guide ______________________________________________________________________ List of Serial Commands All commands can be issued either in uppercase or lowercase. In the command examples, the keyboard input by the user is in bold type. The notation refers to pressing the carriage return (Enter) key on your computer keyboard. Enter a to clear the command buffer before starting to enter commands. Table 5 Serial Line Commands Command ? ?? ACAL ADDR [0 ...
Chapter 4 ________________________________________________________________ Operation Device Information and Status Show Device Information The ? command outputs a listing of device information. If you wish to display the listing for all devices on the current serial line, issue the command ??. ? ?? Example: ? MMT162 0.92 Serial number : Batch number : Module number : Sensor number : Sensor model : Cal. date : Cal.
User's Guide ______________________________________________________________________ Configuring Serial Line Operation Set Serial Line Settings Use the serial line command SERI [b p d s] to set communication settings for the user port.
Chapter 4 ________________________________________________________________ Operation Set Serial Line Response Time With the SDELAY command you can set delay (response time) of the serial line, or view the currently set delay value. SDELAY [delay] where delay = Serial line delay, range 0 ... 255. Multiply the value by four to get milliseconds (for example, delay value of 10 equals 40 millisecond delay).
User's Guide ______________________________________________________________________ Format Measurement Output Use the serial line command FORM to change the format or select certain parameters for the output commands SEND and R. FORM [x] where x = Formatter string Formatter string consists of parameters and modifiers.
Chapter 4 ________________________________________________________________ Operation Table 6 Modifier / x.y parameter U1…U7 “xxx” #a \a #b \b #f \f #n \n #r \r #t \t #v \v #\ \\ #0…#255 \0…\255 ADDR CS2 CS4 CSX ERR SN TIME FORM Command Modifiers Description Restores the default output message (depends on the device configuration). Used alone. Length modifier (number of digits and decimal places). Abbreviation of a measured parameter, for example aw.
User's Guide ______________________________________________________________________ Checksums are calculated as described in the equations below. 1 = 2 = 3 = n cs2 = ∑ bi mod 256 i =1 n cs 4 = ∑ bi mod 65536 i =1 cs x = b'1 ⊕b' 2 ⊕ ⊕ b' n b'i = bi if bi ≠ 36 and bi ≠ 42 b'i = 0 if bi = 36 or bi = 42 Table 7 Symbol cs2 cs4 csx bi n ⊕ 36 42 Symbols Used in FORM Checksum Equations Description Value of CS2 checksum in the output message. Value of CS4 checksum in the output message.
Chapter 4 ________________________________________________________________ Operation Set Serial Interface Mode Use the SMODE command to set the default serial interface mode. SMODE [xxxx] where xxxx = STOP, RUN or POLL In STOP mode: measurements output only by command SEND, all commands can be used In RUN mode: outputting automatically, only command S can be used to stop. In POLL mode: measurements output only with command SEND [addr].
User's Guide ______________________________________________________________________ Set Analog Output Mode (mA/V) The AMODE command can be used to change the analog output mode of channels 1 and 2. When used without parameters it displays the current settings and with parameters new settings can be set. The available parameters are listed in Table 8 below.
Chapter 4 ________________________________________________________________ Operation Set Malfunction Alarm Output for Analog Channels Use the AERR command to set the analog output levels that are output in case of a device malfunction. The default output level is 0. AERR Example: aerr Ch1 error out Ch2 error out : 10.000V ? 0 : 1.000V ? 0 NOTE The error output value must be within a valid range of the output mode.
User's Guide ______________________________________________________________________ Hysteresis Level Lo Level Hi Channel 2: Low Limit High Limit Aerr Quantity Limit Lo Limit Hi Hysteresis Level Lo Level Hi : : : 0.50 0.20 0.80 : : : : : : : : : OFF ON OFF aw 0.10 0.90 0.01 0.20 0.80 Set Voltage for LED Alarm With the LED command, you can set a different voltage level for each channel. LED Example: led ? Ch 1 Led Voltage Ch 2 Led Voltage : : 2.80 V 2.
Chapter 4 ________________________________________________________________ Operation Serial Line Output Commands Start Measurement Output Use the R command to start the continuous outputting of measurement values as an ASCII text string to the serial line. The format of the measurement message is set with the FORM command. R Example: r aw= 0.261 T= 23.8 'C H2O= 15 ppm You can change the format of the output with the following commands: - Outputting interval can be changed with the INTV command.
User's Guide ______________________________________________________________________ Set Output Interval Use the INTV command to set or display the output interval. INTV [n xxx] where n xxx = = time interval = 0 ... 255 time unit = "S", "MIN", or "H" Example: intv 1 min Output interval: 1 MIN The shortest output interval (with n = 0) is approximately one second due to the internal measurement cycle. Output Reading Once Use the SEND command to output the reading once in STOP mode.
Chapter 4 ________________________________________________________________ Operation Troubleshooting Commands Display the Currently Active Errors Use the ERRS command to display the currently active transmitter error states. Possible errors and their causes are listed in Table 9 on page 49.
User's Guide ______________________________________________________________________ Other Commands Opening the Transmitter in POLL Mode Use the OPEN command to connect to a transmitter that is in POLL mode. OPEN [aaa] where aaa = address (0 ... 255) Example: open 0 MMT162 0 line opened for operator commands Closing the Connection to a Transmitter in POLL Mode The CLOSE command closes the connection to the transmitter.
Chapter 4 ________________________________________________________________ Operation Display Command List Use the HELP command to list the available commands.
User's Guide ______________________________________________________________________ Reset Transmitter When the RESET command is given, the transmitter will restart as if it had just been powered on. All transmitter settings are retained. The serial line mode of the transmitter will be set to the mode that was set using the SMODE command. RESET Restore Factory Settings Use the FRESTORE command to restore the factory settings to the transmitter. All user settings will be lost.
Chapter 4 ________________________________________________________________ Operation ppm Conversion MMT162 ppm Conversion for Transformer Oils Traditionally, moisture in transformer oil is measured by using ppm units. The ppm output shows the average mass concentration of water in oil. The moisture and temperature transmitter MMT162 has an option for ppm-output provided that this has been notified when placing the order for the transmitter.
User's Guide ______________________________________________________________________ Conversion Model with Oil-specific Coefficients For additional accuracy, oil-specific conversion model can be used both for mineral and silicon based oils. An oil sample has to be sent to Vaisala for modelling. As a result, the specific coefficients (A and B) for the transformer oil are determined by Vaisala. For additional information, please contact Vaisala.
Chapter 4 ________________________________________________________________ Operation Determination of Oil-Specific Coefficients The equation of the ppm calculation is: ppm = aw×10(B+A/T) With the following procedure the coefficients A and B can be defined for the equation: LOG(PPMsat)= B + A/T Equipment needed: - Apparatus for determining water content ( for example, coulometric titrator and e.g. magnetic stirrer.) - Oil test station: - a temperature test chamber.
User's Guide ______________________________________________________________________ 3. Define the correlation between aw, T and PPM (w/w) from the measured values. Calculate A and B according to the following example. A= LOG ( PPM sat [T 2] ) - LOG ( PPM sat [T 1] ) 1 / (T 2) - 1 / (T 1) B = LOG ( PPM sat [T 1] ) - A/T1 Example (measured water content 213 ppm): T (°C) aw ppmsaturation 24.1 0.478 213/0.478 = 445.6067 57.6 0.188 213/0.188 = 1132.979 A = (LOG(1132.98)-LOG(445.607))/(1/(57.
Chapter 5 ______________________________________________________________ Maintenance CHAPTER 5 MAINTENANCE This chapter provides information that is needed in basic maintenance of the product. Cleaning Clean the transmitter enclosure with a soft. lint-free cloth moistened with mild detergent. Clean the sensor before storing the MMT162 probe and before calibration. For cleaning the the probe you need instrument air and heptane (C7H16) liquid.
User's Guide ______________________________________________________________________ Changing the Filter 1. 2. Remove the filter from the probe. Install a new filter on the probe. When using the stainless steel filter (for oil and fuel cell), take care to tighten the filter properly (recommended force 130 Ncm). New filters can be ordered from Vaisala, see section Spare Parts and Accessories on page 61.
Chapter 5 ______________________________________________________________ Maintenance Table 9 Error Messages Error Message Voltage error T meas error Program flash check sum error Parameter check sum error INFOA check sum error SCOEFS check sum error Action Internal error or invalid supply voltage. Internal error, can be caused by damage to the temperature sensor. Internal error, can be caused by damage to the HUMICAP® sensor. Supplied operating voltage is too low for reliable operation.
User's Guide ______________________________________________________________________ Technical Support For technical questions, contact the Vaisala technical support by e-mail at helpdesk@vaisala.com. Provide at least the following supporting information: - Name and model of the product in question Serial number of the product Name and location of the installation site Name and contact information of a technically competent person who can provide further information on the problem.
Chapter 6 ___________________________________________________Calibration and Adjustment CHAPTER 6 CALIBRATION AND ADJUSTMENT This chapter provides information that is needed in calibration and adjustment of the product. The MMT162 is fully calibrated and adjusted as shipped from factory. The calibration interval depends on the application. It is recommended that calibration is done always when there is a reason to believe that the device is not within the accuracy specifications.
User's Guide ______________________________________________________________________ MM70 in Checking and Adjusting MMT162 can be checked and adjusted by using the MM70. In the field you can check and adjust the probe's reading against the calibrated reference probe of the MM70. To check the MMT162 transmitter with MM70: 1. 2. 3. Connect the MMT162 to the MM70 indicator with the appropriate connection cable (Vaisala item 219980). Turn on the MM70.
Chapter 6 ___________________________________________________Calibration and Adjustment 6. When the reading is stable, give the reference humidity after the question mark and press ENTER. crh RH : 25.21 Ref1 ? RH : 25.22 Ref1 ? RH : 25.22 Ref1 ? 30.1 Press any key when ready ... RH : 25.19 Ref2 ? OK 7. 8. indicates that the adjustment has succeeded and the new calibration coefficients are calculated and stored. Take the probe out of the reference conditions and replace the filter.
User's Guide ______________________________________________________________________ 4. Follow the instructions given on the display. 5. Select RH from the list and press Select. 6. When adjusting relative humidity, you need to check the environment settings before making the adjustment.
Chapter 6 ___________________________________________________Calibration and Adjustment 7. In adjustment mode, enter the correct reference value and then exit by pressing Back.
User's Guide ______________________________________________________________________ One-Point Temperature Adjustment The MMT162 must be unpowered during stabilization which can take 30 minutes or more. Using Serial Line 1. 2. Remove the probe filter and insert the probe into the reference temperature. Enter the command CT and press ENTER: CT 3. Type C and press ENTER a few times to check if the reading is stabilized.
Chapter 6 ___________________________________________________Calibration and Adjustment Using MI70 To adjust temperature: 1. 2. 3. Connect MI70 to MMT162 via connector II. Turn on MI70. On the MI70 display, go to Menu → Functions → Adjustments. 4. Follow the instructions given on the MI70 display. 5. Select T from the list and press Select.
User's Guide ______________________________________________________________________ 6. Select 1-point adjustment and press Select. 7. In adjustment mode, enter the correct reference value and then exit by pressing Back. 8. After you have exited the adjustment mode, MI70 confirms it by displaying the message below.
Chapter 7 ____________________________________________________________ Technical data CHAPTER 7 TECHNICAL DATA This chapter provides the technical data of the product. Measured Parameters Water activity Measurement range 0 ... 1 (@-40 ... +180 °C/ -40 ... +356 °F) Accuracy (including non-linearity, hysteresis and repeatability) When calibrated against salt solutions (ASTM E104-85): 0 ... 0.9 ± 0.02 0.9 ... 1.0 ± 0.03 Response time in oil flow (typical) with stainless steel filter < 1 min.
User's Guide ______________________________________________________________________ Operating Environment Operating temperature Pressure range metal version plastic version Complies with EMC standard Oil flow -40 ... +60 °C (40 ...
Chapter 7 ____________________________________________________________ Technical data Spare Parts and Accessories Description Connection cable for MM70 USB serial interface cable CH1 signal + Ch2 LED cable, M8 threaded connector Sealing ring set (copper) ISO G1/2, 3 pieces Sealing ring set (U-seal) ISO G1/2, 3 pieces Protection plug for connector ISO 1/2" plug NPT 1/2" plug 110 … 240 VAC external power supply Calibration adapter for HMK15 Order code 219980 219690 MP300LEDCBL Stainless steel grid filter (
User's Guide ______________________________________________________________________ Dimensions in mm (inches) 0804-084 Figure 13 Metal Housing Transmitter Dimensions 62 __________________________________________________________________ M210934EN-C
Chapter 7 ____________________________________________________________ Technical data 0804-085 Figure 14 Plastic Housing Transmitter Dimensions VAISALA _______________________________________________________________________ 63
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