Select Page

Moisture in Oil Sensors - Vaisala

Moisture in Oil Sensors – Vaisala

Moisture in oil sensors are mostly used for transformer oil monitoring. Scroll down to see our range of moisture in oil products, from handheld instruments to industrial transmitters.

Frequently asked questions

  1. Where should I install the probe for the best measurement?
  2. What is the maximum flowrate the sensor can withstand?
  3. What is the response time of the sensor?
  4. Can the sensor measure % water by volume in oil (free or emulsified water)?
  5. What does the water activity (aw or aw) output indicate?
  6. What is the benefit of measuring aw versus ppm?
  7. Does the sensor need to be programmed or calibrated to each specific fluid you are using?
  8. In which fluids can the sensor be used?

Answers are here: Measuring Moisture in oil – Application Notes (pdf, opens in a new tab)

Covers: MM70, MMT162, MMT310, MMT330, MHT410

Moisture in Oil

MM70 Hand Held Moisture Meter for Oil


Reliable MM70 is an ideal tool for the preventive maintenance of oil-filled systems. The water activity measurement indicates the margin to free water formation, which causes severe problems in lubrication systems. Excellent pressure and temperature tolerance.

Hand-Held Moisture and Temperature Meter for Spot-Checking in Oil MM70
Click here to show/ hide more info

Hand-Held Moisture and Temperature Meter for Spot-Checking in Oil MM70

Moisture Meter for Oil MM70 enables reliable detection of moisture in oil. The probe can be inserted directly into the process pipe through a ball valve without draining the oil in the system. The MM70 measures moisture in oil in terms of the water activity (aw) and temperature (T). Water activity directly indicates whether there is a risk of free water formation. The measurement is independent of oil type, age and temperature. The MM70 is an ideal tool for the preventive maintenance of oil-filled systems. The water activity measurement indicates the margin to free water formation, which causes severe problems in lubrication systems.

Key Features

  • Measurement independent of oil type, age and temperature – indicates margin to oil saturation
  • In-line process checking through ball valve, no need to drain the oil
  • Rugged and reliable construction
  • Multi-probe operation; dewpoint and CO2 probes can also be connected
  • Vaisala HUMICAP® Sensor – proven field performance since 1973

Consists of MI70AUS plus one probe from the list below.

Configuration code required

MI70AUS Measurement Indicator with AC adapter: $874+GST (2/16)
and rechargeable batteries (Suitable for use with HM70, GM70, DM70 & MM70 probes)

MMP78 Moisture in oil probe for MI70 indicator, aw + T: $2548

Data sheet on MM70 (pdf, opens in a new tab)

Options, Spare Parts for MM70

Options:Indicator Type (selection 1)

MI70AUS (E) Measurement Indicator with AC adapter: $ 874+GST (2/16)
and rechargeable batteries (Suitable for use with HM70, GM70, DM70 & MM70 probes)

Options: Indicator Type (selection 6)

(0) No Indicator Accessories: $No charge
MI70Link (1) MI70 Windows software with RS232 cable: $100
27168ZZ (2) MI70 Analogue output cable: $47
(3) MI70Link with RS232 and analog output signal cables: $146
219687 (5) USB cable for MI70 with MI70Link Windows® software: $100

Options: Installation accessories (selection 8)

(0) No Indicator Accessories: $No charge
HMP228BVS (1) Ball valve set (includes fitting body and blanking plug): $207
210662 Thread adapter ISO ½” to NPT ½”: $20

Options: Measured variables (selection 9)

(A) aw + T: $No charge
HMT300CP6 (B) Average ppm calculation (for transformer oil only): $No charge
Custom Oil (X) aw + T + ppm (specific transformer oil type : _________): $ 285

Options: Connection cable to a transmitter (selection 10)

(0) No connection cable: $No charge
27159ZZ (1) MI70 Connection cable to HMP230 series / HMP228: $60
DRW216050 (2) MI70 Connection cable to MMT310: $79
211339 (3) MI70 Connection cable with RJ45 for MMT330: $60
219980 (4) Connection cable for MMT162: $150

Options: Probe Cable Length (selection 11)

(A) 1.9 meter: $No charge
(B) 1.9m + 10m Extension Cable: $47

Options: Carry case (selection 12)

(0) No carrying case: $No charge
MI70CASE4 (3) Waterproof carry case MI70CASE4: $379

Spare Parts:

Accessories: AC-Adapters

MI70AUSADAPTER AC Adapter for use with MI70: $82
26755 Rechargeable NiMH Battery Pack: $44

Accessories: Connection cables

27168ZZ MI70 Analogue output cable: $47
DRW216050SP MI70 Connection Cable (to MMT310): $103
27159ZZ MI70 Connection cable to HMP230 series / HMP228: $60
211339 MI70 Connection cable with RJ45 for MMT330: $60
219980SP Connection cable for MMT162: $150
213107SP 10m extension cable for the MI70 probes: $83
219687 USB cable for MI70 with MI70Link Windows® software: $100
MI70Link MI70 Windows software with RS232 cable: $100

Accessories: Carrying cases

MI70CASE4 Weather proof (hard plastic) carrying case (MI70CASE4): $379

Accessories: Sensors

HUMICAP180L2 Humicap 180L2: $146
10429SP PT100 Sensor: $38

Accessories: Spare Filters for MM70 Probes

HM47453SP Stainless steel filter: $83
DRW215988SP Protecting cap MMP78: $29

Accessories: Others

HM36854SP Manual Press Tool: $44
DRW216040SP Plastic Wrench: $38
211302SP Calibration adapter for HMK15: $25
DRW212076SP Fitting Body ISO ½” Solid Structure: $73
NPTFITBODASP Fitting Body Set NPT ½”: $73
210662SP Thread Adapter ISO ½” to NPT ½” (Pressure fitting): $38
213617SP Planking plug and M-nut set: $38
HMP228BVS Ball valve assembly: $207
OILMODELLING Laboratory work for specific ppm calculation (one time cost): $2807

MMT162 Series Transmitters for OEM applications – Moisture in Oil


The Vaisala HUMICAP® Moisture and Temperature Transmitter for Oil MMT162 is an excellent economical solution for reliable on-line detection of moisture in oil. Reliable Vaisala HUMICAP® Technology. The MMT162 incorporates the latest generation of the Vaisala HUMICAP® Sensor.

Moisture and Temperature Transmitter for Oil MMT162
Click here to show/ hide more info

Moisture and Temperature Transmitter for Oil MMT162

The Vaisala HUMICAP® Moisture and Temperature Transmitter for Oil MMT162 is an excellent economical solution for reliable on-line detection of moisture in oil. Reliable Vaisala HUMICAP® Technology. The MMT162 incorporates the latest generation of the Vaisala HUMICAP® Sensor. The sensor is developed for demanding moisture measurement in liquid hydrocarbons and has been successfully used in oil applications for over a decade. The sensor’s excellent chemical tolerance provides accurate and reliable measurement over the measurement range.

Key Features

  • Continuous measurement of moisture in oil
  • Measures in lubrication, hydraulic and transformer oils
  • Excellent pressure and temperature tolerance
  • Proven Vaisala HUMICAP® Sensor, 15 years in oil applications
  • Measures water activity
  • ppm-calculation available for transformer oil
  • Small size, easy to integrate
  • NIST traceable calibration (certificate included)

The MMT162 measures moisture in oil in terms of the water activity (aw) and temperature (T). Water activity directly indicates whether there is a risk of free water formation. The measurement is independent of oil type, age and temperature. The ppm calculation for mineral oil based transformer oil is optional in the MMT162.

The MMT162 has two analog outputs that can be scaled and the measurement ranges changed. Additionally, the transmitter has an RS-485 serial output. The signals and the unit power travel in the same cable. An optional LED-cable enables a visual alarm.

Due to its compact size, the MMT162 is quickly and easily installed in tight spaces.

In combination with an MM70 indicator, the MMT162 provides an ideal tool for on site calibration. The MI70 indicator can be used as a display, communication, and data- logging device for the MMT162.

Data sheet on MMT162 (pdf, opens in a new tab)

Order Form with options for MMT162 (pdf, opens in a new tab)

Industrial Moisture in Oil transmitter

Operating voltage 14 .. 28VDC,
Two analog outputs selectable
from 0 .. 20mA, 4 .. 20mA, 0..1V, 0..5V or 0..10VDC.

Configuration code required
Refer to order form for all available options.

MMT162-Plastic-I Moisture in oil transmitter MMT162 plastic ISO 1/2″: $1441+GST (2/16)
MMT162-Metal-I Moisture in oil transmitter MMT162 metal ISO 1/2″: $1587
MMT162-Metal-N Moisture in oil transmitter MMT162 metal NPT 1/2″: $1587

Options, Spare Parts and Accessories for MMT162

MMT162: Options

Options: Measurement Parameter (selection 2)

Custom Oil (X) aw + T + ppm (specific transformer oil type : _________): $285+GST (2/16)

Options: Cables(Selection 9 & 10)

No cable (0) No Cable: $No charge
HMP50Z032 (1) Connection cable, 0.32m, shielded, M8 threaded: $17
HMP50Z30A (2) Connection cable, 3m, shielded, M8 threaded: $35
HMP50Z500 (3) Connection cable, 5m, shielded, M8 threaded: $48
HMP50Z1000 (4) Connection cable, 10m, shielded, M8 threaded: $89
211589 (5) Connection cable, 2m, M8 snap-on: $20
221739 (6) Connection cable, 2m, shielded, connector 90°: $29
221740 (7) Connection cable, 5m, shielded, connector 90°: $48
MP300LEDCBL (8) Connection cable, 3m, M8 threaded, Ch1 signal: $50
+ Ch2 LED

MMT162: Spare Parts and Accessories

Accessories: Connection cables

219980SP Connection cable for MM70 hand-held meter: $150
219690 USB serial interface cable: $99
211598 Connection cable, 2m, M8 snap-on: $20
HMP50Z032SP Connection cable, 0.32m, shielded, M8 threaded: $29
HMP50Z300SP Connection cable, 3m, shielded, M8 threaded: $44
HMP50Z500SP Connection cable, 5m, shielded, M8 threaded: $58
HMP50Z1000SP Connection cable, 10m, shielded, M8 threaded: $116
221739 Connection cable, 2m, shielded, connector 90°: $29
221740 Connection cable, 5m, shielded, connector 90°: $48
MP300LEDCBL Connection cable, 3m, M8 threaded, Ch1 signal: $58
+ Ch2 LED

Accessories: Spare Filters

225356SP Stainless steel grid filter: $58
221494SP Stainless steel grid filter for high flow (>1 m/s): $58

Accessories: Sampling cells (available only for ISO G ½”)

DMT242SC Sampling cell: $100
DMT242SC2 Sampling cell w. Swagelok connectors: $154

Accessories: Connection cables

25905ZZ Service Cable for HMT360: $52

Accessories: Cable Bushings

216588SP Sealed Cable Gland M20 1.105.2016.52: $103
214780SP Conduit Fitting M20x1.5 for NPT1/2 Conduit: $31
214672SP Dummy Plug M20x1.5: $22

Accessories: Other

211302SP Calibration Adapter for HMK15: $25
Note: This product must be used with a Galvanic Isolator or Zener Barrier.
Please see the manual for further information

212483 Galvanic Isolator (single channel): $411
210664 Zener barrier (single channel): $373

MMT310 Series Transmitters – Moisture in Oil


Vaisala HUMICAP® Moisture and Temperature Transmitter Series MMT310 is a fast and reliable on-line detector for moisture in oil. Used in for applications such as e.g. monitoring of transformer oil and of lubrication systems in marine and paper industry.

Moisture and Temperature Meter Series MMT310
Click here to show/ hide more info

Moisture and Temperature Meter Series MMT310

Vaisala HUMICAP® Moisture and Temperature Transmitter Series MMT310 is a fast and reliable on-line detector for moisture in oil. Used in for applications such as e.g. monitoring of transformer oil and of lubrication systems in marine and paper industry.

Key Features

  • Continuous measurement of moisture in oil
  • Proven Vaisala HUMICAP® Sensor, 15 years in oil applications
  • Measurements in lubrication, hydraulic and transformer oils
  • Excellent pressure and temperature tolerance
  • Measuring water activity – ppm calculation for transformer oil
  • Small size, easy to integrate
  • NIST traceable calibration
  • Applications: e.g. monitoring of transformer oil and of lubrication systems in marine and paper industry

Industrial Moisture in Oil transmitters. Includes 2m cable as standard.
Operating voltage 10 .. 35VDC,
Two analog outputs selectable from 0 .. 20mA or 4 .. 20mA.

Data on MMT310 Series (pdf, opens in a new tab)

Includes M12 internal connector. Please choose p/n 212142 or 212416 mating connectors to wire up the MMT310.
Refer to order form for all available options.

Configuration code required

MMT317 with Small pressure-tight probe: $2054+GST (2/16)
MMT318 with Adjustable Probe for Pressurized Pipelines: $2503

Optional sensor heads and cable lengths and other options for MMT310 series

MMT310: Options

Options: Transmitter Type (selection 2)

(F) aw + T: $No charge
HMT300CP6 (M) Average ppm calculation (for transformer oil only): $No charge (2/16)
Custom Oil (X) aw + T + ppm (specific transformer oil type : _________): $285+GST

Options: Interface connection (selection 10)

Connector (0) Connector (M12, 8-pin), no plug: $No charge
212142 (4) 8-pole connector with 5 m cable: $66
210964 (7) 8-pole connector with 10 m cable: $95
212416 (5) 8-pole connector equipped with screw terminals: $95

Options: Probe type (selection 12)

HMP307PZ05-2 (X) 0.5m cable for MMT317: $No charge
HMP307PZ2-2 (P) 2m cable for MMT317: $No charge
HMP307PZ5-2 (Q) 5m cable for MMT317: $194
HMP307PZ10-2 (R) 10m cable for MMT317: $435
HMP308PZ2L178-2 (S) 226mm probe with 2m cable for MMT318: $No charge
HMP308PZ5L178-2 (T) 226mm probe with 5m cable for MMT318: $194
HMP308PZ10L178-2 (U) 226mm probe with 10m cable for MMT318: $435
HMP308PZ2L400-2 (V) 400mm probe with 2m cable for MMT318: $131
HMP308PZ5L400-2 (W) 400mm probe with 5m cable for MMT318: $326
HMP308PZ10L400-2 (Z) 400mm probe with 10m cable for MMT318: $568

Options: Probe Installation Accessories (selection 16)

SWG12ISO12 (K) MMT317, Swagelok ISO ½”: $96
SWG12NPT12 (N) MMT317, Swagelok NPT ½”: $63
SWG12ISO38 (V) MMT317, Swagelok ISO 3/8″: $63
BALLVALVE-1 (E) MMT318, Ball valve set (ISO ½”) with welding joint: $144
Pressure ISO12 (G) MMT318, Pressure Fitting ISO ½”: $No charge
Pressure NPT12 (N) MMT318, Pressure Fitting NPT ½”: $63

MMT310: Spare Parts and Accessories

Accessories: Sensors

HUMICAP180L2 Humicap 180L2: $146
10429SP PT100 Sensor: $38

Accessories: Spare Filters

220752SP Stainless Steel Filter, High Flow: $58
HM47453SP Stainless Steel Filter: $83

Accessories: Connection Cables

212142 Connection Cable 5m 8 pin M12 Female, Black cable: $66
212416SP Female Connector 8 pin M12 with Screw Terminals: $74

Accessories: Probe Mounting Accessories

BALLVALVE-1 Ball Valve ISO ½” with Welding Joint: $144
DRW212076SP Fitting Body ISO ½” Solid Structure: $73
212810SP Pressure Fitting NPT ½”: $186
SWG12ISO12 Swagelok for 12mm Probe ISO ½” Thread: $96
SWG12NPT12 Swagelok for 12mm Probe NPT ½” Thread: $63
SWG12ISO38 Swagelok for 12mm Probe ISO 3/8″ Thread: $63

Accessories: Other

211302SP Calibration Adapter for HMK15: $25
DRW216050SP MI70/HM70 Connection Cable (to HMT310): $103
210964SP 8-pole connector with 10 m cable: $95
ASM211103 Rain shield for HMT310 and MMT310: $102
DRW212957SP Wall Plate / Cover MMT310 Flange Spare Part: $99
OILMODELLING Laboratory work for specific ppm calculation (one time cost): $2807

MMT330 Series Transmitters – Moisture in Oil


Vaisala HUMICAP® Moisture and Temperature Transmitter MMT330 series enables fast and reliable detection of moisture in oil in central lubrication systems, hydraulic systems and power transformers. The series is also compliant with DNV GL 2.4 type approval (Class B).

Moisture and Temperature in Oil Transmitter Series MMT330
Click here to show/ hide more info

Moisture and Temperature in Oil Transmitter Series MMT330

Vaisala HUMICAP® Moisture and Temperature Transmitter MMT330 series enables fast and reliable detection of moisture in oil in central lubrication systems, hydraulic systems and power transformers. The series is also compliant with DNV GL 2.4 type approval (Class B). There are three probe types to enable various types of installations:

  • MMT332 for high pressure installations
  • MMT337 for tight spaces with a thread connection
  • MMT338 for pipeline installations

Key Features

  • Continuous on-line measurement of moisture in oil
  • Ball valve installation – no need to shut down the process
  • Incorporates Vaisala HUMICAP®Sensor – more than 30 years of field performance
  • Ten years of experience in measuring moisture in oil
  • Excellent long-term stability
  • Easy to calibrate and maintain in the field
  • Compatible with Vaisala HUMICAP® Hand-Held Moisture for Oil Meter MM70

Industrial Moisture in Oil transmitters

Include 2m cable as standard.
Operating voltage 10..35VDC/24VAC,
Two analog outputs selectable from 0 .. 20mA, 4 .. 20mA, 0 .. 1V, 0 .. 5V, 0 .. 10V.

Excludes Graphical Display. Refer to order form for all available options.

Data on MMT330 (pdf, opens in a new tab)

Order form with options for MMT330 (pdf, opens in a new tab)

MMT332 Moisture in oil transmitter with Small Flanged Probe for High Pressure Processes: $2851+GST (2/16)

MMT337 Moisture in oil transmitter with Small Pressure Tight Probe: $2302

MMT338 Moisture in oil transmitter with Adjustable Probe for Pressurized Pipelines: $2750

Optional sensor heads and cable lengths for MMT330 series

MMT330: Options

Options: Probe Cables (selection 2)

HMP302PZ2-2 (B) 2m cable for MMT332: $No charge (2/16)
HMP302PZ5-2 (C) 5m cable for MMT332: $195+GST
HMP302PZ10-2 (D) 10m cable for MMT332:$ 437

HMP307PZ2-2 (S) 2m cable for MMT337: $No charge
HMP307PZ5-2 (T) 5m cable for MMT337: $194
HMP307PZ10-2 (U) 10m cable for MMT337: $435
HMP307PZ20-2 (8) 20m cable for MMT337: $801

HMP308PZ2L178-2 (V) 178mm probe with 2m cable for MMT338: $No charge
HMP308PZ5L178-2 (W) 178mm probe with 5m cable for MMT338: $194
HMP308PZ10L178-2 (X) 178mm probe with 10m cable for MMT338: $435
HMP308PZ2L400-2 (1) 400mm probe with 2m cable for MMT338: $131
HMP308PZ5L400-2 (2) 400mm probe with 5m cable for MMT338: $326
HMP308PZ10L400-2 (3) 400mm probe with 10m cable for MMT338: $568
HMP308PZ15L400-2 (5) 400mm probe with 15m cable for MMT338: $655
HMP308PZ20L400-2 (9) 400mm probe with 20m cable for MMT338: $801

Options: Measured parameters (selection 4)

(E) aw + T: $No charge
HMT300CP6 (F) Average ppm calculation (for transformer oil only): $No charge
Custom Oil (X) aw + T + ppm (specific transformer oil type : _________): $285

Options: Display (selection 5)

No Display (0) No Display: $No charge
HMT330LD (1) Graphic LCD with backlight: $262

Options: Power supply (selection 6)

Default Power (0) 10…35 VDC, 24VAC: $No charge
DCDC-1 (1) 10…35 VDC, 24VAC, Galvanic isolation for outputs: $77
POWER-1 (2) Universal AC-power (100…240 VAC): $252
215996 (6) Universal AC-power (100…240 VAC) + AUS power cord: $262

Options: Module Slot 1 (selection 13)

No Module (0) No Module: $No charge
RELAY-1 (1) Relay output: $237
RS485-1 (2) RS-485/Modbus serial interface (galvanically isolated): $188
ETHERNET2 (4) Ethernet (LAN TCP/IP) interface + 2 m cable (RJ45): $312
WLANATENNA1 (5) WLAN wireless interface + antenna: $421
LOGGER-1 (6) Data logger module: $466

Options: Module Slot 2 (selection 14)

No Module (0) No Module: $No charge
RELAY-1 (1) Relay output: $ 237
AOUT-1 (3) 3rd analog output (Need to Select Analog O/P for chan 3): $ 188
LOGGER-1 (6) Data logger module (not possible if selected for Slot 1): $ 466

Options: Cable Bushings (selection 15)

Cable Gland (A) Cable Gland (for 8…11mm cable): $No charge
Conduit Fitting (B) Conduit Fitting NPT ½”: $No charge
212142 (C) 8-pole connector with 5 m cable: $66
212416 (D) 8-pole connector equipped with screw terminals: $66

Options: Transmitter Installation (selection 16)

Normal Mounting (0) Normal Mounting: $No charge
214829 (1) Wall mounting plate: $99
215108 (2) Pole installation kit: $124
215109 (3) Pole installation kit with rain shield: $131
215094 (4) DIN rail kit: $108

Options: Probe Installation Accessories (selection 19)

No Kit (A) No Installation Kit: $No charge
SWG12NPT12 (K) MMT337, Swagelok NPT ½”: $63
SWG12ISO38 (L) MMT337, Swagelok ISO 3/8″: $63
SWG12ISO12 (Y) MMT337, Swagelok ISO ½”: $96
BALLVALVE-1 (M) MMT338, Ball valve set (ISO ½”) with welding joint: $144
(Z) MMT338, Ballvalve-2+230133 set: $202
Pressure NPT12 (N) MMT338, Pressure Fitting NPT ½”: $63
Pressure ISO12 (V) MMT338, Pressure Fitting ISO ½”: $No charge
(3) MMT338, Ballvalve-1 + NPT + ISO for MMT338: $290

Options: PC Accessories (selection 21)

No Accessories (A) No PC Accessories: $No charge
194466ZZ (B) Service cable for PC, RS232 (D9 Female connector): $61
215005 (C) MI70LINK software for Windows with RS232 service cable: $87
219685 (D) Service cable for PC, USB: $77
219916 (E) MI70LINK software for Windows with USB service cable: $99

Options: Calibration (selection 22)

216989 (A) ISO9001 compliant factory calibration: $No charge
Extended Temp Cal (N) Extended temp range calibration (-20°C, 0°C, +60°C): $801

Accessories, Spare Parts, Probe Mounting Accessories for MMT330 Series

MMT330: Spare Parts and Accessories

Accessories: Modules

DCDC-1 Galvanic isolation for outputs: $77+GST (2/16)
RELAY-1 Relay output: $237
RS485-1 RS-485 serial interface: $188
AOUT-1 3rd analog output: $188
POWER-1 Universal AC-power (100…240 VAC): $290
AUSPOWER-1SP Power Supply Module with AUS-Power Cord: $301

Accessories: Sensors

HUMICAP180L2 Humicap 180L2: $146
10429SP PT100 Sensor: $38

Accessories: Spare Filters

220752SP Stainless Steel Filter, High Flow: $58
HM47453SP Stainless Steel Filter: $83

Accessories: Transmitter Mounting Accessories

214829 Wall mounting plate: $99
215108 Pole installation kit: $124
215109 Pole installation kit with rain shield: $131
215094SP DIN rail Clips with Installation plate spare part: $125

Accessories: Probe Mounting Accessories (for MMT332)

216026 5 pcs O-ring Set Size 14.1×1.6: $32

Accessories: Probe Mounting Accessories (for MMT337)

SWG12ISO38 Swagelok for 12mm Probe ISO 3/8″ Thread: $63
SWG12ISO12 Swagelok for 12mm Probe ISO ½” Thread: $96
SWG12NPT12 Swagelok for 12mm Probe NPT ½” Thread: $63
210697 Duct installation kit for MMT337: $77

Accessories: Probe Mounting Accessories (for MMT338)

DRW212076SP Fitting Body ISO ½” Solid Structure: $73
NPTFITBODASP Fitting Body Set NPT ½”: $73
DMT242SC2 Sampling cell w. Swagelok connectors: $154
BALLVALVE-1 Ball Valve ISO ½” with Welding Joint: $144
BALLVALVE-2 Ball Valve ISO ½” with thread joint IS0 ¾” for MMT338: $144
HM36854SP Manual Press: $44
218773 ISO ½” plug: $38

Accessories: Connection cables

19446ZZ RS232 Serial Interface Cable with D9 Female Connector: $61
219685 USB Service Cable to RJ45 Port: $77
211339 MI70 Connection Cable with RJ45 Connector: $60
25917ZZ HMI41 Connection Cable with RJ45 Connector: $52
215005 MI70LINK PC Software with RS232 Serial Cable w/ D9 Female: $87
219916 MI70LINK PC Software with USB Service Cable to RJ45 Port: $98

Accessories: Output cables for 8-pin connector

212142 Connection Cable 5m 8 pin M12 Female, Black cable: $66
212416SP Female Connector 8 pin M12 with Screw Terminals: $74
214806SP Male Connector 8 pin M12 with Cable and Adapter: $38

Accessories: Cable Bushings

214728SP Cable Gland M20x1.5 for 8…11mm Cable: $31
214729 Cable Gland M20x1.5 for 11…14mm Cable: $17
214780SP Conduit Fitting M20x1.5 for NPT1/2 Conduit: $31
214672SP Dummy Plug M20x1.5: $22

Accessories: Other

211302SP Calibration Adapter for HMK15: $25
HMP247CG Cable Gland M20x1.5 with Split Seal: $50
OILMODELLING Laboratory work for specific ppm calculation (one time cost): $2807

MHT410 Moisture, Hydrogen and Temperature Transmitter


The Vaisala Moisture, Hydrogen and Temperature Transmitter MHT410 for Transformer Oil measures directly from representative transformer oil giving both reliable hydrogen trend as well as fast moisture data.

Moisture, Hydrogen and Temperature Transmitter MHT410
Click here to show/ hide more info

Moisture, Hydrogen and Temperature Transmitter MHT410

The Vaisala Moisture, Hydrogen and Temperature Transmitter MHT410 for Transformer Oil measures directly from representative transformer oil giving both reliable hydrogen trend as well as fast moisture data. 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.

Key Features

  • The transmitter MHT410 can be easily installed and mounted onto an operational transformer
  • Transmitter MHT410 is robust and needs no maintenance
  • Measurement is immune to oil contaminants
  • The measurement depth of the sensor can be adjusted.

Data on MHT410 (pdf, opens in a new tab)

Configuration code required

MHT410 Combined Oil Moisture, Hydrogen and Temperature Transmitter: $12813

MHT410 Options, Spare Parts & Accessories

MHT410: Options

Options: Probe (selection 1)

NPT (1) MHT410 with 1.5″ NPT male thread: $No charge

Options: Analog Output Parameters, CH1, CH2, CH3 (selection 2, 3, 4)

None (A) None (only digital RS-485 / Modbus output)*: $No charge
aw (B) Oil moisture, water activity (aw, 0…1): $No charge
% RS (C) Oil moisture 10m cable for MMT332: $No charge
ppm (D) Oil moisture, water ppm (0…100ppm, for mineral oil): $No charge
H2 (0…5000ppm) (E) Hydrogen, H2 (0…5000ppm for mineral oil) select to match with accessory display scale: $No charge
H2 (0…2000ppm) (F) Hydrogen, H2 (0…2000ppm for mineral oil): $No charge
Temp (-20…+80°C) (G) Temperature (-20…+80°C / -4…+176°F): $No charge
Temp (0…+120°C) (H) Temperature (0…+120°C / +32…+248°F): $No charge
Temp (0…+80°C) (J) Temperature (0…+200°F / -17.8°C…+93.3°C): $No charge
Special Scale (X) Define Parameter and scale for channels: $No charge

* Digital RS-485 output with Modbus always included in all models

Options: Transmitter Cable (selection 5)

None, cable gland (0) No cable, only with M20 x 1.5mm cable gland, for cable 8…11mm outer diameter: $No charge
None, NPT ½” (1) No cable, only with M20 x 1.5mm cable gland, for NPT ½” conduit: $No charge
5m PUR cable (2) Factory installed 5m Shielded PUR cable with M20 cable gland: $No charge

MHT410: Spare Parts and Accessories

Accessories: Connection cables

219690 USB Serial Interface Cable: $99
219980SP Connection cable to MI70 from MHT410: $150
CBL210392-5MSP 5 meter shielded PUR cable: $130
CBL210392-10MSP 10 meter shielded PUR cable: $202

Accessories: Cable Bushings

214728SP Cable Gland M20x1.5 for 8…11mm Cable: $31
236620SP Detachable screw terminal block, Blue PK1304D 4P: $15
214780SP Conduit Fitting M20x1.5 for NPT1/2 Conduit: $31

Accessories: Other

242003 Loop-powered display 4…20 mA, with relays, Nokeval 302: $392
242422 External DIN rail power 100…240VAC to 24VDC: $130
BALLVALVE-3SET 1.5″ NPT ball valve with welding fitting: $ TBA

Obsolete and Superseded Products

 

HMP228 Moisture and Temperature Transmitter for Oil, Fas HMP228 is replaced by MMT330 series
MMT318 Moisture and Temperature Transmitter for Oil – discontinued