MMT310 Series Moisture and

Temperature Transmitters for Oil

Features

• Continuous measurement of

moisture in oil

• Proven Vaisala HUMICAPâ sensor,

over 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

• Traceable calibration for

measurement and analog outputs

(certificates included)

• Applications: e.g. monitoring of

transformer oil and of lubrication

systems in marine and paper

industry

Vaisala HUMICAPâ Moisture and Temperature Transmitter Series for Oil MMT310 is a

fast and reliable online detector for moisture in oil.

Reliable Vaisala HUMICAPâ

Technology

The MMT310 series incorporates the

latest generation of the Vaisala HUMICAP

sensor, developed for demanding

moisture measurement in liquid

hydrocarbons. The sensor’s excellent

chemical tolerance provides accurate

and reliable measurement over the wide

measurement range.

Measuring Water Activity

MMT310 measures moisture in oil in

terms of the water activity (aw) and

temperature (T). Water activity indicates

directly whether there is a risk of free-

water formation. The measurement is

independent of oil type, age, and

temperature.

Water Content as PPM

Calculation for Transformer

Oils

PPM units are traditionally used in

transformer applications. They indicate

the average mass concentration of water

in oil. The ppm calculation for mineral oil

based transformer oil is optional in the

MMT310 series.

Diverse Applications and

Demanding Conditions

MMT310 can be used in lubrication and

hydraulic systems as well as in

transformers. It can be used for on-line

moisture monitoring and as a control

function, allowing separators and oil

purifiers to be started only when

necessary.

Installation Options

MMT310 has two adjustable probe

lengths. The transmitter can be ordered

with a ball-valve set that enables the

insertion and removal of the moisture

probe for calibration, without the need to

empty the oil system.

MMT317 has a small pressuretight probe

with optional Swagelok fittings.

An optional rain shield is available for

outdoor installations.

Several Outputs, One

Connector

The MMT310 series has two analog

outputs and an RS-232 serial output. The

output signals and the supply power

travel in the same cable, the only cable

connected to the unit.