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