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Issue 3.
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Product Overview
The E923 humidistat offers a calibration-free, high accuracy and high quality solution to humidity
control in an electrical accessory plate form factor.
The E923 regulates to a fully adjustable relative humidity setpoint between 5% and 95%, combined
with an adjustable relative humidity hysteresis (differential) of anything between 1% and 10%.
3 LED indicators on the front of the unit illustrate the currently detected relative humidity level in
relation to the desired setpoint. The green indicator is illuminated when the sensed humidity is
within the selected differential band around the setpoint. The appropriate red indicator illuminates
to indicate that the sensed humidity is detected as above or below the differential band around the
setpoint.
Product Wiring
1. IMPORTANT
: ensure all electrical connections are isolated before commencing any work on the
unit.
2. Power to the humidistat is provided via the Live and Neutral input terminals labelled “L” and “N”
(230V AC, 50Hz). On the 24 volt product variant (“/24V”) the same terminals are used (24V AC
or DC) and are not polarity sensitive.
3. A voltage-free changeover relay output capable of switching loads of up to 10A, 250V AC
(resistive) is provided by the humidistat. Connect to your application in an appropriate manner
given the following:
• The Common “COM” terminal is connected to the Normally Open “NO” terminal when
the relative humidity is sensed to be above the “Setpoint” humidity (use to control
dehumidifiers).
• Conversely, the “COM” terminal is connected to the Normally Closed “NC” terminal
when the relative humidity is sensed to be below the “Setpoint” humidity (use to control
humidifiers).
Figure 1
Typical wiring example
