Michell Instruments MDM50, Руководство пользователя

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MDM50 LP Version User’s Manual
Michell Instruments 1
INTRODUCTION
1 INTRODUCTION
The MDM50 comprises a fast responding polymer sensor fitted into a sample block with
an integrated filter cartridge, and Legris push fittings or optional Swagelok
®
tube fittings
on the gas inlet and outlet. The measured dew point from the sensor is shown on the
clear red LED display on the front panel of the instrument.
The MDM50 can be supplied with either °C or °F dew-point measurement units.
A 4-20 mA analog output is provided for connection to a chart recorder, data-logger or
computer system, so dew-point trends can be analyzed over time.
The electronics are housed in a rugged Peli case, providing NEMA 6 protection when the
lid is closed. The case is supplied with a lifetime guarantee.
The MDM50 is powered by a rechargeable NiMH battery pack, giving between 12 and
16 hours of measurement time from a full charge. The instrument is delivered complete
with a universal battery charger stored in the lid. It takes 16 hours to fully charge the
battery pack, during which time the instrument can be switched on or off. The charger
is suitable to connect power to the instrument indefinitely, but it is recommended to
allow the battery pack to go through a full charge-discharge cycle at least once per
month.
MDM50 polymer moisture sensors are subject to a 9-point calibration, where their
performance is characterized against a fundamental reference hygrometer. This process,
and subsequent quality testing, ensures that all sensors behave optimally before they
are used in the field. Each MDM50 is supplied with a calibration certificate traceable to
national standards (NIST) from Michell Instruments' accredited laboratory.