Michell Instruments MDM300 Specifications
Portable Instruments
MDM300 & MDM300 I.S.
Advanced Dew-Point Hygrometer
A high-speed portable dew-point hygrometer, offering rapid spot-check measurements of dew
point or moisture content in many applications, including compressed air, natural gas and highvoltage switchgear quench gas. This lightweight, ATEX, IECEx, FM, CSA, GOST and INMETRO
certifi ed product allows more measurements per working hour than any other comparable
product. A hard-wearing but ergonomic case and an easy-to-use interface allows comfortable
and practical operation in the toughest industrial environments.
Highlights
• Repeatedly fast measurements at low pressure
from less than 15 minutes for T95 to -60°C
• Higher pressure measurements possible up to 350
barg
• Long battery life: up to 48 hours of typical use
between charges
• Intuitive application kits allow quick and
straightforward connection to your sample point
• Durable, yet easy to handle and operate: designed
for use in industrial environments
• Lightweight: less than 1.5kg
• 13 point traceable calibration certifi cate
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Applications
• Dew point in natural gas processing and pipelines
• Monitoring of desiccant dryers for compressed air or
plastic moulding equipment
• Moisture measurement in high-voltage switchgear
quench gas
• Moisture measurement in petrochemical refi neries
• Industrial gas production and transportation
• Medical gas quality
• Dew-point measurement in metallurgical applications
Portable Instruments
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MDM300 & MDM300 I.S.
The Reliable Spot Checking Portable
Ideal for spot checks of dew point or moisture content, the
MDM300 & MDM300 I.S. include all the features needed for
effi cient work. An extremely fast response and accurate,
stable measurement are complemented by an instrument
which is easy to use, has data-logging and built in sampling
components as standard. The instrument can be supplied
with a range of accessories including sampling systems
and a professional carry case. For use in hazardous areas,
the MDM300 I.S. has ATEX certifi cation to
II 1 G Ex ia
IIC T4 Tamb -20°C to +60°C; FM, CSA, IECEx, GOST-R,
GOST-K and INMETRO standards. The MDM300 and
MDM300 I.S. are both IP66/NEMA 4 rated, and therefore
suitable for demanding outdoor applications.
Measurement Range
The MDM300 series can provide measurement to
-60°Cdp in gases at atmospheric pressure in less than
15 minutes (30 minutes to -60°Cdp for MDM300 I.S.).
This, combined with no required waiting time between
measurements, allows the user to take many readings
per day, increasing effi ciency and reducing costs
when compared to other instruments on the market.
Easy of Use
The rugged but ergonomic design of the MDM300 series
combines industrial durability with comfortable one or twohanded operation. The intuitive menu system and large,
easy-to-press buttons enable the user to easily confi gure
the instrument to display the parameters they require, even
with gloved hands.
Measurement Performance
Best-in-class accuracy of 1°Cdp (from -60 to +20°Cdp)
gives the user improved measurements. Every instrument
undergoes a 13 point calibration over a period of 10
days and all calibration certifi cates are traceable to
national standards via the NPL (UK) and NIST (USA).
In addition, the MDM300 series can be used to check
and recalibrate Michell Easidew dew-point transmitters,
affording the user the benefi t of a verifi cation without the
associated downtime.
Sampling Solutions
The MDM300 series offers versatile sampling arrangements
ranging from simple fi xed orifi ces for low pressure
measurement to confi gurable high-pressure sampling
systems up to 350 barg. A number of application
kits are available providing out of the box sampling
systems specifi cally for the most popular applications.
Please contact Michell Instruments for further details.
Hazardous certifi cations
The MDM300 I.S. has been certifi ed by ATEX &
IECEx, FM, CSA and GOST for use in hazardous areas.
This is the perfect portable instrument for use in
natural gas plants, petrochemical refi neries, offshore
platforms and a range of other hazardous areas.
Sensing Technology
The MDM300 uses Michell’s highly developed ceramic
impedance sensor, which is constructed using state-ofthe art thin and thick fi lm techniques. Operation of the
sensor depends upon the adsorption of water vapour
into a porous non-conducting ‘sandwich’ between two
conductive layers built on top of a base ceramic substrate.
The active sensor layer is very thin – less than one micron
and the porous upper layer that allows transmission of
water vapour into the sensor is less than one nano-metre.
The resulting sensor responds rapidly to changes in
moisture – both in measuring humidity and also when being
dried. It is very rugged and gives 1°C dew-point accuracy
coupled with excellent long-term reliability and stability.
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Hygroscopic Insulator (3)
Base Electrode (2)
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Advanced Ceramic Tile
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