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| EMD Datasheet, PDF (1/3 Pages) Willow Technologies Ltd – General Eastern Humidity Sensor | |||
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EMD-4000
General Eastern
Humidity Sensor
The EMD-4000 is a bulk resistance-type humidity
sensor based on the impedance change of a thin-
polymer is deposited on Bismuth alloy terminals,
which are set on a ceramic substrate. The sensor
is excited by a low voltage alternating current and
the impedance measured as a function of relative
humidity.
functional groups that disassociate into ionic
species as water vapor is absorbed. This results
in increased electrical conductance through
the sensor or a decrease in impedance. The
impedance is an inverse exponential function of the
surrounding humidity.
Features
⢠Excellent interchangeability
⢠Available in 5% accuracy
⢠Economical
⢠Recovers from condensation
⢠Good resistance to chemical vapors
⢠Fast response
⢠Low hysteresis
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Willow Technologies Ltd. Unit 3 Borers Yard, Borers Arms Road, Copthorne, West Sussex, RH10 3LH, United Kingdom.
+ 44 (0) 1342 717102 ï·+ 44 (0) 1342 717014 ïªinfo@willow.co.uk ïºhttp://www.willow.co.uk
W42014
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