Product guide

33
Humidity and Dew-Point Instruments
Please note: Michell Instruments adopts a continuous development program which sometimes
necessitates specifi cation changes without notice. Please contact us for latest version.
www.michell.com
Precision Manufacturing
MDM300
Advanced Dew-Point Hygrometer
The MDM300 High-Speed Dew-Point Hygrometer offers rapid
spot check measurements of dew-point or moisture content,
in a compact instrument packed with features and intelligent
engineering.
An extremely fast response and accurate, stable
measurement is complemented by an instrument which
is easy to use, has data-logging and built-in sampling
components as standard, and can be supplied with a range
of accessories including a stand-alone sampling system and a
practical carry case.
Highlights
• Repeatable fast measurements, each in less than 15
minutes for T95 to -60°C (-76°F)
• Long battery life with up to 48 hours of typical usage
between charges
• Best in its class: 1°C (1.8°F) accuracy
• External device input 4-20 mA for dew-point, temperature
or pressure transmitters
• Bluetooth connection for data download
• Built-in basic sensor protection sampling system allowing
measurements up to 350 barg (5000 psig)
• Easy operation
Technical Specifi cations
Performance
Measurement technology Michell ceramic sensor
Accuracy ± 1°C from -60 to +20°C (-76 to +68°F) dp
± 2°C from -100 to -60°C (-148 to -76°F) dp
± 0.2°C (0.3°F) temperature
Measurement range Calibrated -100 to +20°C (-148 to +68°F) dp
Readings to +30°C dp
Measurement units °C, °F, K dew point
ppm
v
, ppm
w
for air, N
2
, H
2
, CO
2
, SF
6
Gas temperature: %RH, gm
-3
, gkg
-1
Option: active pressure (bara/g, psig, MPa,
KPa)
Resolution (display) 0.1 for all dp derived units and autoranging
where appropriate, e.g. ppm
Resolution (measurement) 0.1°C dew point
Typical response speed T95 in 15 minutes to -60°C (-76°F)
Repeatability Better than 0.1°C (0.2°F)
Stability 0.1°C (0.2°F)
Sensitivity 0.01°C (0.02°F) or better
Hysteresis 0.05°C (0.1°F)
Electrical output/input
Auxiliary inputs 4-20 mA external input selectable as either dp,
temperature or pressure
Battery type NiMH 4.8V
Battery operating life Up to 48 hours of typical usage between
charges
Battery charger Intelligent charger (supplied)
Operating conditions
Operating pressure range 35 MPa (350 barg / 5000 psig) max
Operating environment Outdoors 0-100% RH condensing
Operating temperature -20 to +50°C (-4 to +122°F)
Storage/transport temp -40 to +70°C (-40 to +158°F)
Mechanical specifi cation
Display Blue LCD graphical display
Enclosure type Steel fi ber-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 (0.5 to 2.5 scfh)
Filters 50 micron stainless steel sinter in the inlet port
(other porosities available)
Gas wetted materials 316 stainless steel
Outline dimensions 218 x 170 x 90mm (8.6 x 6.7 x 3.5”) (dxwxh)
Weight 1.35kg (2.98lbs)
General
Data Logging 8 megabytes; Log interval: 5 to 60 second;
Logs per log fi le: Up to 10,000
Communications (Wireless) Bluetooth
TM
range up to 5m (16.5ft)
Languages English, Spanish, Portuguese, Italian, French,
German
Issue No: MDM300_97156_V4.1_UK_0312