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

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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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Technical Speciﬁ cations

Portable Instruments

Product

MDM300 MDM300 I.S.

Performance

Measurement technology Michell ceramic sensor Accuracy ±1°C from -60 to +20°C dew point

Calibrated range Spot checks: Online analysis:

Uncalibrated readings from +20 to +30°C dew point Measurement units °C, °F, K dew point & gas temperature ppmV, ppmW

for air, N2, H2, CO2, SF

% RH, g/m3, g/kg

Resolution (display) 0.1 for all dew-point derived units and autoranging where appropriate Resolution (measurement) Better than 0.1°C dew point Typical response speed T95 in ≤15 minutes to -60°C dew point T95 in ≤30 minutes to -60°C dew point

±2°C from -100 to -60°C dew point

±0.2°C temperature

-70 to +20°C dew point

-100 to -70°C dew point

°C, °F, K dew point & gas temperature

& g/kg for air, N2, H2, CO2, SF

ppm

ppmV, lb/mmscf & g/m3 for natural gas

ppmV, g/m3 & % RH

Electrical Input/Output

Battery type NiMH 4.8V Battery operating Life Up to 48 hours of typical usage between charges Up to 24 hours of typical usage between charges Battery charger Intelligent charger (supplied) Intelligent charger (charger not certiﬁ ed for

hazardous area use)

Operating Conditions

Operating pressure 350 barg max Operating environment Outdoors 0 to +100% RH condensing

Operating temperature -20 to +50°C Storage/transport temperature -20 to +50°C

Mechanical Speciﬁ cations

Display Blue LCD graphical display Enclosure type Steel ﬁ bre-loaded high-impact polyamide 6 IP/NEMA rating IP66/NEMA 4 Gas connections 1/8” NPT female (other options available) Flow across sensor 0.2 to 1.2 Nl/min 0.2 to 0.5 Nl/min Gas wetted materials AISI 316L stainless steel AISI 316L stainless steel, PTFE Seal, Borosilicate

Outline dimensions 218mm x 170mm x 90mm (d x w x h) Weight 1.35kg 1.5kg

glass, ceramic

General

Data logging 8 megabytes; Log interval: 5 to 60 sec; Logs per log ﬁ le: Up to 10,000 Communications (Wireless) Bluetooth User interface languages English, French, German, Italian, Portuguese, Spanish

range up to 5m (version 2.0)

Certiﬁ cation Codes

CE ATEX: II 1G Ex ia IIC T4 Ga (-20°C to +50°C)

IECEx: Ex ia IIC T4 Ga (-20°C to +50°C)

INMETRO: Ex ia IIC T4 Ga (-20°C to +50°C)

TC TR Ex: 0Ex ia IIC T4 Ga

FM: Class I, Division 1, Groups A B C D, T4

CSA: Class I, Division 1, Groups A B C D, T4

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Portable Instruments

Dimensions

218mm (8.56”)

90mm (3.54”)

Michell Instruments MDM300 Specifications

Specifications and Main Features

Frequently Asked Questions

User Manual