Easidew Plus Portable Hygrometer User’s Manual
Kahn Instruments
1
INTRODUCTION
1
INTRODUCTION
The Easidew Plus Portable Hygrometer comprises a fast responding polymer sensor
installed into a sample block with an integrated filter cartridge, and 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 Easidew Plus Portable Hygrometer 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 Easidew Plus Portable Hygrometer 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. A battery charge indicator on the instrument
front panel warns when the battery is low.
Easidew Plus Portable Hygrometer 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, insures that all sensors behave
optimally before they are used in the field. Each Easidew Plus Portable Hygrometer is
supplied with a calibration certificate traceable to national standards (NIST) from Kahn
Instruments.
