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Portable Dew-Point Hygrometer - Michell MDM300 Series

Updated:2023-09-22

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  • Brand: PST/Michell
  • Model: MDM300 Series
  • Description: A high-speed portable dew-point hygrometer for rapid spot-check measurements of dew point or moisture content in compressed air, natural gas, high voltage switchgear quench gas and many other applicat
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Product Details

Portable Dew-Point Hygrometer - Michell MDM300 Series Description:

Product Manual

Quick Spot-Check Measurement of Moisture

Features

Repeatedly fast measurements at low pressure from less than 15 minutes for T95 to -60 °C (-76 °F)

Higher pressure measurements possible – up to 350 barg (5076 psig)

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 1.5 kg (3.3 lb)

13-point traceable calibration certificate

A high-speed portable dew-point hygrometer for rapid spot-check measurements of dew point or moisture content in compressed air, natural gas, high voltage switchgear quench gas and many other applications. The sensor responds quickly to changes in moisture whether from dry to wet or wet to dry. This means there is no need to wait between measurements, allowing operators to make more measurements in a day.

The general purpose MDM300 is suitable for safe area use, while the intrinsically safe MDM300 I.S. has global hazardous area approval from ATEX, UKCA, IECEx, cQPSus and EAC Ex and is able to measure moisture in flammable gases such as natural gas or bio-gas.

It has a hard-wearing, ergonomic case and an easy-to-use interface for comfortable and practical operation in the toughest industrial environments.

Specification


MDM300

MDM300 Intrinsically Safe
Performance
Measurement Technology Michell ceramic metal-oxide moisture sensor
Accuracy ±1 °C (±1.8 °F) from -60 to +20 °C (-76...+68 °F) dew point
±0.2 °C (±0.36 °F) temperature
Calibrated Range Spot Checks: -70...+20 °C (-94...+68 °F) dew point
Online Analysis: -100...-70 °C (-148...-94 °F) dew point
Uncalibrated Readings From +20...+30°C (+68...+86°F) dew point
Measurement Units °C, °F, K dew point & gas temperature ppmV,
ppmW for air, N2, CO2, SF6
%rh, g/m3, g/kg
°C, °F, K dew point & gas temperature
ppmw & g/kg for air, N2, H2, CO2, SF6
ppmv, lb/MMscf & g/m3 for natural gas
ppmv, g/m3 & %rh
Resolution (Display) 0.1 for all dew-point derived units and autoranging where appropriate
Resolution (Measurement) Better than 0.1°C (0.18°F) dew point
Typical Response Speed T95 in ≤15 minutes to -60°C (-76°F) dew point T95 in ≤30 minutes to -60°C (-76°F) dew point
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 (not certified for hazardous area use)
Operating Conditions
Operating Pressure 35 MPa (350 barg / 5076 psig) max
Operating Environment Outdoors 0...+100% rh condensing
Operating Temperature -20...+50 °C (-4...+122 °F)
Storage/Transport Temperature -20...+50 °C (-4...+122 °F)
Mechanical Specification
Display Blue LCD graphical display
Enclosure Type Steel fiber-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...1.2 Nl/min 0.2...0.5 Nl/min
Gas Wetted Materials AISI 316L stainless steel AISI 316L stainless steel, PTFE Seal, Borosilicate glass, ceramic
Outline Dimensions 218 x 170 x 90 mm (8.58” x 6.69” x 3.54”) (d x w x h)
Weight 1.35 kg (2.98 lb) 1.5 kg (3.31 lb)
General
Data Logging 8 megabytes; Log interval: 5...60 sec; Logs per log file: Up to 10,000
Communications (Wireless) BluetoothTM range up to 5 m (version 2.0)
User Interface Languages English, French, German, Italian, Portuguese, Spanish
Certification Codes
CE
UKCA

ATEX/UKCA: II 1G Ex ia IIC T4 Ga (-20 °C...+50 °C)

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

TR CU Ex: 0Ex ia IIC T4 Ga

cQPSus: Class I, Division 1, Groups A B C D, T4 Class I, Zone 0,
AEx/Ex ia IIC Ga T4 (-20 °C...+50 °C)

Suitable 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 refineries

Industrial gas production and transportation

Medical gas quality

Dew-point measurement in metallurgical applications

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