MDM300 & MDM300 I.S. (Intrinsically Safe) Advanced Portable Dew-point Hygrometer

MDM300 Sampling Options

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 certified 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.

Product Features

  • 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 certificate

MDM300 & MDM300 Intrinsically Safe

Technical Specification

MDM300 Intrinsically Safe
Measurement Technology Michell ceramic sensor
Accuracy ±1°C from -60 to +20°C dew point
±2°C from -100 to -60°C dew point
±0.2°C temperature
Calibrated Range Spot Checks: -70 to +20°C dew point
Online Analysis: -100 to -70°C dew point
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, 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 dew point
Typical Response Speed T95 in ≤15 minutes to -60°C T95 in ≤30 minutes to -60°C 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 (charger not certified 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 Specifications
Display Blue LCD graphical display
Enclosure Type Steel fibre-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 glass, ceramic
Outline Dimensions 218 x 170 x 90mm (d x w x h)
Weight 1.35kg 1.5kg
Data Logging 8 megabytes; Log interval: 5 to 60 sec; Logs per log file: Up to 10,000
Communications (Wireless) BluetoothTM range up to 5m (version 2.0)
User Interface Languages English, French, German, Italian, Portuguese, Spanish
Certification Codes
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


MDM300 Sampling Options MDM300 Sampling Options
To get the best possible performance from your MDM300 or MDM300 I.S., it is crucial to have appropriate sample conditioning for your measurement point.

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