MS Electronics E925, E925/24V, E923, E923/24V Product Manual

E925

energy saving controls

Product Guide

Standard Humidistat

E925/24V

today, tomorrow and in the future

mselectronics.co.uk

Product Overview

The E925 humidistat offers a calibration-free, high accuracy and high quality solution to humidity
control in an electrical accessory plate form factor.

The E925 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%.

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

dehumidiers).

• 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

humidiers).

Figure 1 Typical wiring example

2Issue 3.0