Vaisala MMT330 User Manual
USER'S GUIDE
Vaisala HUMIC AP ® Moist ur e and
Temperature Transmitter for Oil
MMT330
M210764EN-F
USA version
PUBLISHED BY
Vaisala Oyj Phone (int.): +358 9 8949 1
P.O. Box 26 Fax: +358 9 8949 2227
FI-00421 Helsinki
Finland
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. 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.
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Table of Contents
CHAPTER 1
GENERAL INFORMATION .......................................................................... 13
About This Manual ................................................................. 13
Contents of This Manual ..................................................... 13
Version Information ............................................................. 14
Documentation Conventions ............................................... 14
Safety ....................................................................................... 15
ESD Protection ....................................................................... 15
Recycling ................................................................................ 16
Regulatory Compliances ....................................................... 16
DNV Type Approval ............................................................ 16
Transmitters with LAN or WLAN Interface .......................... 17
Transmitters with WLAN Interface ...................................... 17
Patent Notice .......................................................................... 18
Trademarks ............................................................................. 18
Software License .................................................................... 18
Warranty .................................................................................. 18
CHAPTER 2
PRODUCT OVERVIEW ................................................................................ 19
Introduction to MMT330 ......................................................... 19
Basic Features and Options ................................................ 20
Structure of the Transmitter ................................................ 20
Probe Options ..................................................................... 22
Typical Applications ............................................................ 23
Method Used for Measuring Moisture in Oil .................. 23
Lubrication Oil in Paper Machines ................................. 23
Transformer Oil .............................................................. 24
CHAPTER 3
INSTALLATION ............................................................................................ 27
Mounting the Housing ........................................................... 27
Standard Mounting .............................................................. 27
Wall Mounting with Wall Mounting Kit ................................. 28
Mounting with DIN Rail Installation Ki t ................................ 29
Pole Installation with Installation Kit for Pole or Pipeline .... 29
Mounting Rain Shield with Installation Kit ........................... 31
Panel Mounting Frame ........................................................ 32
Wiring ...................................................................................... 33
Cable Bushings ................................................................... 33
Grounding the Cables ......................................................... 34
Grounding the Transmitter Housing .................................... 35
Signal and Power Supply W iring ......................................... 36
Connections to a 24 VAC Power Supply ............................ 38
MMT332 for High-Pressure Applications ............................ 39
MMT337 Small Pressure-Tight Probe ................................. 39
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MMT337 Probe with Swagelok Connector for Tight-place
Installations .......................................................................... 40
MMT338 for Pressurized Pipelines ..................................... 42
Tightening the Clasp Nut ..................................................... 43
Ball Valve Installation Kit for MMT338 ................................. 44
Sampling Cell for MMT338 .................................................. 47
Optional Modules.................................................................... 48
Power Supply Module.......................................................... 48
Installation ...................................................................... 49
Warnings ........................................................................ 50
Galvanic Isolation of Power Supply ..................................... 53
Third Analog Output ............................................................ 53
Installation and Wiring .................................................... 54
Relays .................................................................................. 55
Installation and Wiring .................................................... 55
Selecting the Activation State of the Relay .................... 55
RS-422/485 Interface .......................................................... 56
Installation and Wiring .................................................... 57
LAN Interface ....................................................................... 61
WLAN Interface ................................................................... 62
Attaching the WLAN Antenna......................................... 63
Data Logger Module ............................................................ 63
8-Pin Connector ................................................................... 65
CHAPTER 4
OPERATION ................................................................................................. 67
Getting Started ........................................................................ 67
Display/Keypad (Optional) ..................................................... 67
Basic Display ....................................................................... 67
Graphic History .................................................................... 68
Menus and Navigation ......................................................... 70
Changing the Language ................................................. 70
Rounding Setting ............................................................ 71
Display Backlight Setting ................................................ 71
Display Contrast Setting ................................................. 71
Using Display/Keypad ............................................... 71
Using Serial Line ....................................................... 72
Keypad Lock (Keyguard) ................................................ 72
Menu PIN Lock ............................................................... 72
Factory Settings ............................................................. 73
Display Alarms ..................................................................... 73
Configuring a Display Alarm ........................................... 74
Using Serial Line ............................................................ 76
MI70 Link Program for Data Handling .................................. 77
Serial Line Communication ................................................... 78
User Port Connection .......................................................... 79
User Port Operating Modes ............................................ 79
Service Port Connection ...................................................... 80
Connection Cables ......................................................... 80
Installing the Driver for the USB Cable .......................... 80
Using the Service Port .................................................... 81
LAN Communication .............................................................. 81
IP Configuration ................................................................... 82
Using Display/Keypad .................................................... 83
Using Serial Line ............................................................ 84
Wireless LAN Configuration ................................................ 85
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Using Display/Keypad .................................................... 86
Using Serial Line ............................................................ 87
Communication Protoco l ..................................................... 88
Web Configuration for LAN and WLAN ............................... 88
Terminal Program Settings ................................................. 89
Opening a Serial/USB connection ................................. 89
Opening a Telnet session (LAN/WLAN) ........................ 91
List of Serial Commands ..................................................... 92
Getting Measurement Message from Serial Line ................ 94
Starting Continuous Outputting ...................................... 94
Stopping Continuous Outputting .................................... 95
Outputting Reading Once .............................................. 95
Assign an Alias for the SEND Command ...................... 95
Outputting Reading Once From All Transmitters ........... 96
Communicating with a Transmitter in POLL Mode ............. 96
OPEN ............................................................................. 96
CLOSE ........................................................................... 96
Formatting Serial Line Mess age ......................................... 97
FTIME and FDATE......................................................... 97
General Settings ..................................................................... 97
Changing Quantities and Units ........................................... 97
Using Display/Keypad .................................................... 98
Using Serial Line ............................................................ 98
FORM........................................................................ 98
UNIT .......................................................................... 99
Date and Time ................................................................... 100
Using Display/Keypad .................................................. 100
Using Serial Line .......................................................... 100
Data Filtering ..................................................................... 101
Using Display/Keypad .................................................. 101
Using Serial Line .......................................................... 101
Device Information ............................................................ 102
? ................................................................................... 102
LIGHT ........................................................................... 103
HELP ............................................................................ 104
ERRS ........................................................................... 104
MODS .......................................................................... 104
VERS ........................................................................... 105
Resetting Transmitter by Using Serial Line ....................... 105
RESET ......................................................................... 105
Locking Menu/Keypad Using Serial Line .......................... 105
LOCK ........................................................................... 105
Serial Output Settings .......................................................... 106
Using Display/Keypad ....................................................... 106
Using Serial Line ............................................................... 107
SERI ............................................................................. 107
SMODE ........................................................................ 108
ADDR ........................................................................... 108
INTV ............................................................................. 109
SDELAY ....................................................................... 109
ECHO ........................................................................... 109
Data Recording ..................................................................... 110
Selecting Data Recording Quantities ................................ 110
DSEL ............................................................................ 110
View Recorded Data ......................................................... 111
DIR ............................................................................... 111
PLAY ............................................................................ 112
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Deleting the Recorded Files .............................................. 113
UNDELETE .................................................................. 113
Analog Output Settings ....................................................... 114
Changing Output Mode and Range ................................... 114
Analog Output Quantities .................................................. 115
AMODE/ASEL .............................................................. 116
Analog Output Tests .......................................................... 117
ITEST ........................................................................... 117
Analog Output Fault Indication Setting .............................. 118
AERR ............................................................................ 118
Extend Analog Output Range ............................................ 119
Operation of Relays .............................................................. 119
Quantity for Relay Output .................................................. 119
Relay Setpoints ................................................................. 119
Hysteresis .......................................................................... 121
Relay Indicating Transmitter Error Status ......................... 121
Enabling/Disabling Re lays ................................................. 123
Setting Relay Outputs........................................................ 123
RSEL ............................................................................ 125
Testing Operation of Relays .............................................. 126
RTEST .......................................................................... 126
CHAPTER 5
MODBUS .................................................................................................... 127
Overview of Modbus Protocol Support .............................. 127
Taking Modbus into Use .................................................... 128
Enabling Serial Modbus ....................................................... 129
Using Display/Keypad (Optional) ...................................... 129
Using Serial Line ............................................................... 129
Enabling Ethernet Modbus .................................................. 130
Using Display/Keypad (Optional) ...................................... 130
Using Serial Line ............................................................... 132
Diagnostic Modbus Counters .............................................. 133
Viewing Counters Using Display/Keypad .......................... 133
Viewing Counters Using Service Port ............................... 133
Disabling Modbus ................................................................. 134
CHAPTER 6
MAINTENANCE .......................................................................................... 135
Periodic Maintenance ........................................................... 135
Cleaning ............................................................................ 135
Changing the Probe Filter ................................................. 135
Changing the Sensor ........................................................... 136
Error States ....................................................................... 137
Technical Support ................................................................ 139
Product Returns.................................................................... 139
CHAPTER 7
CALIBRATI O N AND AD JUSTMENT ......................................................... 141
Cleaning the Sensor ............................................................. 142
Opening and Closing the Adjustment Mode ...................... 142
Relative Humidity Adjustment ............................................. 143
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Using Push Buttons ........................................................... 143
Using Display/Keypad ....................................................... 144
Using Serial Line ............................................................... 145
CRH ............................................................................. 145
Relative Humidity Adjustment after Sensor Change ........ 146
Using Display/Keypad ....................................................... 146
Using Serial Line ............................................................... 146
FCRH ........................................................................... 146
Temperature Adjustment ..................................................... 147
Using Display/Keypad ....................................................... 147
Using Serial Line ............................................................... 147
Analog Output Adjustment.................................................. 149
Using Display/Keypad ....................................................... 149
Using Serial Line ............................................................... 149
ACAL ............................................................................ 149
Feeding Adjustment Information ........................................ 150
Using Display/Keypad ....................................................... 150
Using Serial Line ............................................................... 150
CTEXT ......................................................................... 150
CDATE ......................................................................... 150
CHAPTER 8
TECHNICAL DATA .................................................................................... 151
Specifications ....................................................................... 151
Performance ...................................................................... 151
Water Activity ............................................................... 151
Temperature ................................................................. 151
Operating Environm ent ..................................................... 152
Probe Specifications ......................................................... 152
MMT332 ....................................................................... 152
MMT337 ....................................................................... 152
MMT338 ....................................................................... 152
Inputs and Outputs ............................................................ 153
Mechanics ......................................................................... 153
Technical Specifications of Optional Modules .................. 154
Power Supply Module .................................................. 154
Analog Output Module ................................................. 154
Relay Module ............................................................... 155
RS-485 Module ............................................................ 155
LAN Interface Module .................................................. 155
WLAN Interface Module ............................................... 155
Data Logger Module..................................................... 156
Spare Parts and Accessories .............................................. 156
Dimensions (mm/inch) ......................................................... 158
MMT332 ............................................................................ 160
MMT337 ............................................................................ 160
MMT337 with Swagelok Connector .................................. 161
MMT338 ............................................................................ 161
APPENDIX A
MODBUS REFERENCE ............................................................................. 163
Function Codes .................................................................... 163
Register Map ......................................................................... 164
Data Encoding ................................................................... 164
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32-Bit Floating Point Format ......................................... 164
16-Bit Integer Format ................................................... 165
Measurement Data (Read-Only) ....................................... 166
Status Registers (Read-Only) ........................................... 166
Configuration Registers ..................................................... 167
Exception Status Outputs .................................................... 167
Diagnostic Sub-Functions ................................................... 168
Device Identification Objects .............................................. 169
Exception Responses .......................................................... 169
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List of Figures
Figure 1 Transmitter Body ...................................................................... 20
Figure 2 Inside the Transmitter ............................................................... 21
Figure 3 Probe Options .......................................................................... 22
Figure 4 The Water Solubility of Transformer Oils versus Temperature 25
Figure 5 Standard Mounting Dimensions (in mm/inch) .......................... 27
Figure 6 Mounting with Wall Mounting Kit .............................................. 28
Figure 7 Dimensions of the Plastic Mounting Plate (mm/inch) ............... 28
Figure 8 Mounting with DIN Rail Installation Ki t ..................................... 29
Figure 9 Vertical Pole ............................................................................. 29
Figure 10 Horizontal Pole ......................................................................... 30
Figure 11 Mounting with Metal Wall Mounting Plate ................................ 30
Figure 12 Dimensions of Metal Mou nt ing Pl ate (mm/inch) ...................... 31
Figure 13 Mounting Rain Shield with Installation Kit ................................ 31
Figure 14 Panel Mounting Frame ............................................................. 32
Figure 15 Panel Mounting Dimensions (mm/inch) ................................... 33
Figure 16 Cable Bushings ........................................................................ 33
Figure 17 Grounding the Screen of Electrical Cable ................................ 34
Figure 18 Screw Terminal Block on Motherboard .................................... 36
Figure 19 Connections to 24 VAC Power Supply ..................................... 38
Figure 20 MMT332 Installation ................................................................. 39
Figure 21 MMT337 Probe with Swagelok Installation Kit ......................... 40
Figure 22 MMT337 Probe Installation to Pipe line wit h Swagelok
Installation Kit ........................................................................... 40
Figure 23 MMT338 Probe ......................................................................... 42
Figure 24 Sealing of Fitting Body into Process ........................................ 43
Figure 25 Tightening the Clasp Nut .......................................................... 43
Figure 26 Installing the MMT338 Probe through a Ball Valve Assembly . 45
Figure 27 Sampling Cell DMT242SC2 ..................................................... 47
Figure 28 Power Supply Module .............................................................. 48
Figure 29 Galvanic Isolation Module ........................................................ 53
Figure 30 Third Analog Output ................................................................. 53
Figure 31 Third Analog Output Sel ecti on ................................................. 54
Figure 32 Relay Module ........................................................................... 56
Figure 33 RS-422/485 Module ................................................................. 57
Figure 34 4-Wire RS-485 Bus .................................................................. 59
Figure 35 2-Wire RS-485 Bus .................................................................. 60
Figure 36 LAN Interface Module ............................................................... 61
Figure 37 WLAN Interface Module ........................................................... 62
Figure 38 Data Logger Module ................................................................. 64
Figure 39 Pinout of the Optional 8-Pin Connector .................................... 65
Figure 40 Basic Display ............................................................................ 67
Figure 41 Graphical Display ..................................................................... 68
Figure 42 Graphical Display with Data Logger ......................................... 69
Figure 43 Main Menus .............................................................................. 70
Figure 44 Display Alarm Active ................................................................ 74
Figure 45 Display Alarms ......................................................................... 74
Figure 46 Modifying an Alarm Limit .......................................................... 75
Figure 47 Service Port Connector and User Port Terminal on
Motherboard ............................................................................. 78
Figure 48 Connection Example between PC Serial Port and User Port .. 79
Figure 49 Network Interface Menu ........................................................... 83
Figure 50 IP Configuration Menu .............................................................. 83
Figure 51 Wireless LAN Settings .............................................................. 86
Figure 52 Entering Network SSID ............................................................ 86
Figure 53 Selecting the Wireless Network Type ...................................... 86
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Figure 54
Figure 55 Opening a Serial Connection .................................................... 90
Figure 56 Opening a Telnet Connection ................................................... 91
Figure 57 Device Information on Display ................................................ 102
Figure 58 Current/Voltage Switches of Output Modules ........................ 114
Figure 59 Measurement-Based Relay Output Modes ............................ 120
Figure 60 FAULT/ONLINE STATUS Relay Output Modes ..................... 122
Figure 61 Relay Indicators on Display .................................................... 124
Figure 62 Serial Interface Settings ......................................................... 129
Figure 63 IP Configuration ...................................................................... 131
Figure 64 Wireless LAN Settings ............................................................ 131
Figure 65 Communication Protoco l ........................................................ 131
Figure 66 Modbus Counters ................................................................... 133
Figure 67 Changing the Sensor .............................................................. 136
Figure 68 Error Indicator and Error Message ......................................... 137
Figure 69 Adjustment and Purge Buttons ............................................... 142
Figure 70 Adjustment Menu .................................................................... 143
Figure 71 Selecting Point 1 Reference Type .......................................... 144
Figure 72 Accuracy over Temperature Range........................................ 151
Figure 73 Transmitter Body Dimensions ................................................ 158
Figure 74 WLAN Antenna Dimensions ................................................... 159
Figure 75 MMT332 Probe Dimensions ................................................... 160
Figure 76 MMT337 Probe Dimensions ................................................... 160
Figure 77 MMT337 Probe with (Optional) S wagel ok Connector,
Figure 78 MMT338 Probe with Stainless Steel Filter (Oil Filter),
Web Configuration Interface for LAN........................................ 89
Dimensions ............................................................................. 161
Dimensions ............................................................................. 161
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List of Tables
Table 1 Manual Revisions ..................................................................... 14
Table 2 Application, Location Classes .................................................. 16
Table 3 Quantities Measured by MMT330 ............................................ 19
Table 4 MMT338 Probe Dimensions ..................................................... 42
Table 5 Connecting the Twisted Pair Wires to the Screw Terminals .... 58
Table 6 4-Wire (Switch 3: On) ............................................................... 59
Table 7 2-Wire (Switch 3: Off) ............................................................... 60
Table 8 Observation Periods and R es olut io n ........................................ 63
Table 9 Wiring of the Optional 8-Pin Connector .................................... 65
Table 10 Periods for Trend and Max/Min Calculations ........................... 68
Table 11 Graph Information Messages in Cursor Mode ......................... 69
Table 12 ALSEL Parameters ................................................................... 76
Table 13 Default Serial Communication Settings for the User Port ........ 79
Table 14 Communication Settings for the Service Port .......................... 81
Table 15 IP Settings for the LAN and WLAN Interfaces ......................... 82
Table 16 Wireless LAN Settings .............................................................. 85
Table 17 Measurement Commands ........................................................ 92
Table 18 Formatting Commands ............................................................. 92
Table 19 Data Recording Commands ..................................................... 93
Table 20 Calibration and Adjustment Commands ................................... 93
Table 21 Setting and Testing the Analog Outputs .................................. 93
Table 22 Setting and Testing the Relays ................................................ 93
Table 23 Other Commands ..................................................................... 94
Table 24 FORM Command Modifiers...................................................... 99
Table 25 Filtering Levels ....................................................................... 101
Table 26 Selection of Output Modes ..................................................... 108
Table 27 Relay State Examples ............................................................ 123
Table 28 Supported Modbus Variants ................................................... 127
Table 29 Error Messages ...................................................................... 138
Table 30 Indicator Led Functions .......................................................... 143
Table 31 Standard Probe Cable Lengths and Approximate
Transmitter Weight (in kg/lb) .................................................. 154
Table 32 Spare Parts and Accessories ................................................. 156
Table 33 Supported Function Codes..................................................... 163
Table 34 MMT330 Modbus Register Blocks ......................................... 164
Table 35 Measurement Data Registers................................................. 166
Table 36 Status Registers ..................................................................... 166
Table 37 Configuration Parameter Registers ........................................ 167
Table 38 Configuration Flag Registers .................................................. 167
Table 39 MMT330 Exception Status O utputs ....................................... 167
Table 40 MMT330 Modbus Diagnostics ................................................ 168
Table 41 MMT330 Modbus Device Identification .................................. 169
Table 42 MMT330 Modbus Exception Responses ............................... 169
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12 ___________________________________________________________________ M210764EN-F
Chapter 1 _________________________________________________________ General Information
CHAPTER 1
GENERAL INFORM ATION
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 MMT330.
Contents of This Manual
This manual consists of the following chapters:
- Chapter 1, General Information, provides general notes for the manual
and the product.
- Chapter 2, Product Overview, introduces the features, advantages, and
the product nomenclature.
- Chapter 3, Installation, provides you with information that is intended
to help you install the product.
- Chapter 4, Operation, contains information that is needed to operate
this product.
- Chapter 5, Modbus, contains information that is needed when
operating the transmitter using the Modbus protocol.
- Chapter 6, Maintenance, provides information that is needed in basic
maintenance of the product.
- Chapter 7, Calibration and Adjustment, provides information that is
needed in calibration and adjustment of the product.
- Chapter 8, Technical Data, provides the technical data of the product.
- Appendix A, Modbus Reference, describes the Modbus functions and
data of the transmitter.
VAISALA ________________________________________________________________________ 13
User's Guide _______________________________________________________________________
Manual Code
Description
M210764EN-F
December 2013. This manual. Added new
description. Various small corrections.
M210764EN-E
May 2011. This manual. Applicable from
temperature range.
Warning alerts you to a serious hazard. If you
instructions very carefully at this point, there is a risk of injury or even
death.
Caution warns you of a potential hazard. If you do not read and follow
instructions carefully at this point, the product could be damaged o
important data could be lost.
Note highlights important information on using the product.
Version Information
Table 1 Manual Revisions
command descriptions: ALSEL, AOVER, CON,
DSEND, and MODS. Updated technical
specification. Updated FILT command
transmitter software version 5.10 onward.
Added MODBUS protocol. Updated serial line
command descriptions. Updated storage
Documentation Conventions
Throughout the manual, important safety considerations are highlighted
as follows:
WARNING
CAUTION
NOTE
do not read and follow
r
14 ___________________________________________________________________ M210764EN-F
Chapter 1 _________________________________________________________ General Information
Ground the product, and verify outdoor installation grounding
periodically to minimize shock hazard.
Do not modify the unit. Improper modification can damage the product,
lead to malfunction, or
legislation.
Safety
The Vaisala HUMICAP® Moisture and Temperature Transmitter for Oil
MMT330 delivered to you has been tested for safety and approved as
shipped from the factory. Note the following precautions:
WARNING
CAUTION
make the product noncompliant with applicable
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 electrostatic discharges when touching, removing, or
inserting any objects inside the equipment housing.
To make sure you are not delivering high static voltages yourself:
- Handle ESD sensitive components on a properly grounded and
protected ESD workbench. When this is not possible, ground yourself
to the equipment chassis before touching the boards. Ground yourself
with a wrist strap and a resistive connection cord. When neither of the
above is possible, touch a conductive part of the equipment chassis
with your other hand before touching the boards.
- Always hold the boards by the edges and avoid touching the
component contacts.
VAISALA ________________________________________________________________________ 15
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Recycle all applicable material.
Dispose of the unit according
with regular household refuse.
Type
MMT330
Temperature
B
Humidity
B
Vibration
A
EMC
B
Enclosure
B/IP65
Recycling
to statutory regulations. Do not dispose of
Regulatory Compliances
DNV Type Approval
The Vaisala HUMICAP® Moisture and Temperature Transmitter for Oil
MMT330 is found to comply with Det Norske Veritas' Rules for
Classification of Ships, High Speed & Light Craft and Det Norske
Veritas' Offshore standards.
Applicable tests carried out according to Standard for Certification
No. 2.4, April 2006.
Table 2 Application, Location Classes
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TYPE APPROVED PRODUCT
CERTIFICATE NO.: A-13529
Chapter 1 _________________________________________________________ General Information
Transmitters with LAN or WLAN Interface
This equipment has been tested and found to comply with the limits for a
Class B digital device, pursuant to Part 15 of the FCC Rules. These limits
are designed to provide reasonable protection against harmful
interference in a residential installation. Operation is subject to the
following two conditions: (1) this device may not cause interference, and
(2) this device must accept any interference, including interference that
may cause undesired operation of the device.
This equipment generates, uses and can radiate radio frequency energy
and, if not installed and used in accordance with the instructions, may
cause harmful interference to radio communications. However, there is
no guarantee that interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off and on,
the user is encouraged to try to correct the interference by one or more of
the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to
which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
Transmitters with WLAN Interface
This device has been designed to operate with a 2 dBi half-wave antenna.
Antennas with a gain greater than 2 dBi are prohibited for use with this
device. The antenna impedance is 50 ohms.
To reduce potential radio interference to other users, the antenna type and
its gain should be so chosen that the equivalent isotropically radiated
power (EIRP) is not more than that permitted for successful
communication.
This Class [B] digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe [B] est conforme à la norme NMB-
003 du Canada.
VAISALA ________________________________________________________________________ 17
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Patent Notice
The Vaisala HUMICAP® Moisture and Temperature Transmitter for Oil
MMT330 is protected by, for example, the following patents and their
corresponding national rights:
Finnish patent 98861, French patent 6650303, German patent 69418174,
Japanese patent 3585973, UK patent 0665303, and U.S. patent 5607564.
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 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.
18 ___________________________________________________________________ M210764EN-F
Chapter 2 ___________________________________________________________ Product Overview
Quantity
Abbreviation
Metric Unit
Non-Metric Unit
Water activity
AW
Temperature
T
ºC
ºF
CHAPTER 2
PRODUCT OVERVIE W
This chapter introduces the features, advantages, and the product
nomenclature of the Vaisala HUMICAP® Moisture and Temperature
Transmitter for Oil MMT330.
Introduction to MMT330
The MMT330 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. The transmitter
incorporates a capacitive thin film sensor. The operation of the sensor is
based on changes in its capacitance as the thin polymer film absorbs
water molecules.
The transmitter can be configured in many ways. It can have either a
blank cover or a cover with a local display and keypad with which the
user can operate the transmitter. The power supply voltage can be
selected from three alternatives. Two analogue output signals can be
scaled and the measurement ranges changed within certain limits. The
MMT330 transmitter can be supplied probe cable lengths.
MMT330 also provides for accurate temperature measurement. It is an
easy-to-install on-line transmitter which can be calibrated against
traceable salt solutions.
Vaisala HUMICAP® Moisture and Temperature Transmitter for Oil
MMT330 provides reliable moisture measurement in wide range of
applications. Analog outputs can be chosen between current and voltage
signals. Alternatively, digital outputs RS-232 (standard) or RS-422/485
(optional) can be selected.
Table 3 Quantities Measured by MMT330
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The numbers refer to Figure 1 above:
1 = Signal + powering cable gland
2 = Cable gland for optional module, or WLAN antenna connector
3 = Cable gland for optional module or AC mains cable
4 = Cover screw (4 pcs)
5 = Display with keypad (optional)
6 = Cover LED
Basic Features and Options
- Several probes for various applications
- User-friendly display and keypad interface (optional)
- Different probe mounting kits and probe cable lengths
- Transmitter mounting kits for multiple installation purposes
- Support for Modbus serial communications protocol
- USB connectivity for service connections via the optional
USB-RJ45 cable
- Optional modules:
- Isolated power supply
- Power supply module for AC mains power
- RS-422/485-module
- LAN and WLAN interfaces
- Data logger module with real time clock
- Additional analog output module
- Relay module
Structure of the Transmitter
1104-001
Figure 1 Transmitter Body
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Chapter 2 ___________________________________________________________ Product Overview
The following numbers refer to Figure 2 above:
1 = Service port (RS-232)
2 = DIP switches for analog output settings
3 = Power supply and signal wiring screw terminals
4 = Relay, data logger, RS-422/485, LAN, or WLAN module
(optional)
5 = Grounding connector
6 = Power supply module (optional)
7 = Relay, data logger, or analog output module (optional)
8 = Humidity probe cable
9 = Galvanic isolation module (optional)
10 = Adjustment buttons with indicator LED. Purge is not available.
Figure 2 Inside the Transmitter
0604-006
VAISALA ________________________________________________________________________ 21
User's Guide _______________________________________________________________________
The following numbers refer to Figure 3 above:
1 = MMT332 for high-pressure applications
2 = MMT337 small pressure-tight probe
3 = MMT338 adjustable probe for pressurized pipelines
(40 bar, ball valve)
Probe Options
0509-143
Figure 3 Probe Options
For probe cable lengths, see Table 31 on page 154.
22 ___________________________________________________________________ M210764EN-F
Chapter 2 ___________________________________________________________ Product Overview
Typical Applications
Method Used for Measuring Moisture in Oil
The MMT330 transmitter measures water in oil in terms of water activity
(aw) which can be determined as follows: water activity indicates the
amount of oil in 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.
The most important feature which distinguishes the measurement of
water activity (aw) from the traditional measurement of absolute water
content (in ppm) is that the saturation point remains stable regardless of
the oil type or the aging of oil, additives used etc. As water activity
exceeds 0.9 aw in any system, there is a risk for segregation (especially if
the temperature decreases). The water activity is used for alarming at the
point of >0.9 aw that the risk for free water in the system is obvious. The
most important advantages of this system are the fact that water activity
is immune to the aging of oil and to additives, and that the MMT330
transmitter can be used for continuous on-line measurements. In addition,
the MMT330 can be calibrated against salt solutions and no reference
oils are needed.
Lubrication Oil in Paper Machines
Typically, a paper machine contains two or three separate lubrication
systems. Usually, one is located at the wet end and the other at the dry
end. There is a certain amount of free moisture constantly present which
means that there is a risk of this moisture becoming into contact with the
machine bearings. The most common reasons for the entrance of water
are an inadequate sealing of the housing and cleaning with high pressure.
However, accidental leakages from oil coolers and other equipment may
also cause damage. In paper machines, the oil should absorb water while
lubricating the bearings and then release this water when collected into
the reservoir. It is to be noted that bearings should never be exposed to
oils that have a high water content; this is especially important during
standstill because the risk for corrosion process increases as the oil
temperature decreases. It is essential to monitor the water content and
keep it on a suitable level.
When measuring the water content of oil in paper machines, it would be
useful 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.
VAISALA ________________________________________________________________________ 23
User's Guide _______________________________________________________________________
Transformer Oil
The determination of moisture in oil is an essential part of a
comprehensive transformer maintenance program. Aging and
deterioration increase the 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. Heating and
cooling have a considerable effect on moisture levels in oil. While
temperature raises, the paper insulation of transformers tends to loose
moisture which is absorbed by the oil surrounding it. Saturation level is
thus a true indicator of moisture present. The MMT330 method provides
for a reliable detection of the aging of oil and possible leakages.
Oil immersed transformers rely on the oil for cooling, protection from
corrosion and as an important component of their insulation. Excessive
moisture contents in oil causes accelerated ageing of 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.
Heating and cooling of a transformer effect moisture levels in oil. This is
due to the fact that the water solubility of oil is temperature dependent. In
general, water solubility increases as temperature raises, see Figure 4 on
page 25. Changes in temperature affect also on water desorption of the
paper insulation around the transformer windings. Desorption of water
from the insulation increases as temperature raises and the surrounded oil
absorbs desorbed water. Moisture level in oil is thus a true indicator of
moisture present in the paper insulation.
In addition, it must be noted that capacity of oil to absorb water depends
both on the chemical structure of the oil and the additives.
24 ___________________________________________________________________ M210764EN-F
Chapter 2 ___________________________________________________________ Product Overview
WATER SOLUBILITY IN MINERAL TRANSFORMER OIL
10
100
1000
10000
0 10 20 30 40 50 60 70 80 90 100
Temperature (°C)
average water
solubility
range of
variation due to
oil type
range of
variation due to
oil type
0510-029
Figure 4 The Water Solubility of Transformer Oils versus
Temperature
The margins show the range of variation of water solubility found in
mineral oils.
VAISALA ________________________________________________________________________ 25
User's Guide _______________________________________________________________________
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26 ___________________________________________________________________ M210764EN-F
Chapter 3 ________________________________________________________________ Installation
CHAPTER 3
INSTALLATION
This chapter provides you with information that is intended to help you
install the product.
Mounting the Housing
Standard Mounting
Mount the housing by fastening the transmitter to the wall with 4 screws,
for example, M6 (not provided).
0804-066
Figure 5 Standard Mounting Dimensions (in mm/inch)
VAISALA ________________________________________________________________________ 27
User's Guide _______________________________________________________________________
The following numbers refer to Figure 6 above:
1 = Plastic mounting plate
2 = Mount the plate to wall with 4 screws M6 (not provided)
3 = Arched side up
4 = Fasten MMT330 to the mounting plate with 4 fixing screws M3
(provided)
5 = Holes for wall/junction box mounting
183 (7.20)
133 (5.24)
116 (4.57)
104 (4.09)
84 (3.30)
59 (2.32)
59 (2.32)
Ø6.2 (0.24)
4.5 (0.18)
10.5 (0.41)
6.5 (0.26)
8.5 (0.33)
Thickness
9.5 (0.37)
Wall Mounting with Wall Mounting Kit
When mounting with wall mounting kit the mounting plate (Vaisala
order code 214829) can be installed directly on wall or onto a standard
wall box (also US junction box). When wiring through back wall, remove
the plastic plug from the wiring hole in the transmitter before mounting.
0503-004
Figure 6 Mounting with Wall Mounting Kit
Figure 7 Dimensions of the Plastic Mounting Plate (mm/inch)
28 ___________________________________________________________________ M210764EN-F
0804-065
Chapter 3 ________________________________________________________________ Installation
The following numbers refer to Figure 9 above:
1 = Fixing brackets (2 pcs) M8 (provided) for 30 ... 102 mm poles
2 = Mounting nuts M8 (4 pcs)
Mounting with DIN Rail Installation Kit
DIN rail installation kit includes a wall mounting kit, 2 clip-fasteners,
and 2 screws M4 x 10 DIN 7985 (Vaisala order code: 215094).
1. Attach two spring holders to the plastic mounting plate by using the
screws provided in the installation kit.
2. Fasten MMT330 to the plastic mounting plate with 4 screws
(provided).
3. Press the transmitter onto the DIN rail so that the clip-fasteners
snap into the rail.
0503-002
Figure 8 Mounting with DIN Rail Installation Kit
Pole Installation with Installation Kit for Pole or Pipeline
Installation kit for pole or pipeline (Vaisala order code: 215108) includes
the metal mounting plate and 4 mounting nuts for pole mounting. When
mounting, the arrow in the metal mounting plate must point upward, see
Figure 11 on page 30.
0503-006
Figure 9 Vertical Pole
VAISALA ________________________________________________________________________ 29
User's Guide _______________________________________________________________________
The following number refers to Figure 10 above:
1 = Mounting nuts M8 (4 pcs)
The following numbers refer to Figure 11 above:
1 = Mount the plate to wall with 4 screws M8 (not provided)
2 = Fasten MMT330 to the mounting plate with 4 fixing screws
M6 (provided)
3 = Note the position of the arrow when mounting. This side must
be up when mounting.
0503-007
Figure 10 Horizontal Pole
Metal mounting plate is included in rain shield with installation kit and
installation kit for pole or pipeline.
0503-041
Figure 11 Mounting with Metal Wall Mounting Plate
30 ___________________________________________________________________ M210764EN-F
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