Hygro Module HM1200 pages

Galltec Mess- und Regeltechnik GmbHt

D-71145 Bondorf . Germany t
Tel. +49 (0)7457-9453-0 . Fax +49 (0)7457-3758 t
E-Mail: sensoren@galltec.de . Internet:www.galltec-mela.det

MELA Sensortechnik GmbH

D-07987 Mohlsdorf-Teichwolframsdorf . Germany
Tel. +49(0)3661-62704-0 . Fax +49(0)3661-62704-20
E-mail:mela@melasensor.de . Internet: www.galltec-mela.de

Product info sheet
Hygro-Modul HM120 t
with one changeover contact, scale range 30...100%rh, IP00
Application
The hygro module HM120 is a humidity-dependent switch that
can be fitted in equipment such as hygrostats, humidifiers, dehumidifiers, ventilating fans, driers and many more. The module represents an on-off controller with changeover contact. The
switch connection is via a connecting terminal, but can also be
supplied ready-made with cable connections. Several versions
of different lengths are available as a shaft. Protection of the
module is of the IP00 type.

4

Description of the Hygrostat
The humidity measuring element, produced by Galltec under the
name Polyga®, consists of several synthetic fabric bands each
with 90 individual fibres with a diameter of 3µm. A special process gives the fibre hygroscopic properties. The measuring element adsorbs and desorbs humidity. The swelling effect, which
is predominantly in a lengthways direction, is carried via a suitable lever system to a microswitch with an extremely small switching path. The measuring element reacts quickly and precisely
to the change in air humidity. By adjusting the setpoint value
control knob, the lever system is engaged so that when the set
air humidity is reached the microswitch is activated.

2

The fan shaped measuring element should be protected from
dust, dirt and water. The hygro module is designed for pressureless systems.

1

The electrical connection
must only be carried out by
properly qualified personnel

Maintenance
The measuring element is maintenance-free in pure
ambient air. Aggressive media containing solvent can
cause measuring errors and failure, depending on the
type and concentration. Deposits which eventually
form a water-repellent film over the measuring element
are harmful (such as resin aerosols, lacquer aerosols,
smoke deposits etc.)

Notes on voltage
The measurement location of the humidity controller should be selected such that there is no buildup of condensate on or in the device. This applies
particularly for operation with a voltage higher than
48V. If the voltage is higher, there is a risk of voltage arcing in the event of water condensation
on the microswitch or connecting terminals which
might destroy the controller. In the case of voltage
below 48V, the humidity controller can be used up
to 100%rh.

Technical Data
scale range .............................................................. 30..100%rh
measuring accuracy ........................................................ ±3%rh
range of operation .................................................... 35...95%rh
measuring medium ............... air, pressureless, non-aggressive
switching difference (microswitch) ref. to 50%rh ... approx. 4%rh
breaking capacity
t
max. 250VAC and
tt 0,1 ... 5A ohmic load for dehumidifying
tt 0,1 ... 2A ohmic load for humidifying
tt 0,1 ... 1A for inductive load with cos φ = 0,7
t
lifetime .................................... 100.000 breaking cycles
t Please observe the notes on voltage.
optional microswitch with gold contact
breaking capacity
t
max. 48 VAC and
tt 1...100 mA
allowable operating temperature .................................. 0...60°C
medium temp. coefficient ....... -0.2%/K relative to 20°C and 50%rh
adjustment ........................... at average air pressure 430 m NN
allowable air speed ...................................................... 15m/sec
half-life period at v=2m/sec ............................................. 1.2min
fixing ............................................... only with plastic screws M3
contacting ................................................. connecting terminals
applied directives / standards
t low-voltage directive 2014/35/EU
t
EMC directive 2014/30/EU
ttt DIN EN 60730-1:2012-10
ttt DIN EN 60730-2-13:2008-09
type of protection ................................................................ IP00
measuring element .....
....... Polyga®-measuring element, water resistent, washable
dimensions ................................................................ 59x47x33 mm
weight ............................................................... approx. 0.25 kg

This information is based on current knowledge and is intended to provide details of our products and their possible applications. It does not, therefore, act
as a guarantee of specific properties of the products described or of their suitability for a particular application. It is our experience that the equipment may
be used across a broad spectrum of applications under the most varied conditions and loads. We cannot appraise every individual case. Purchasers and/or
users are responsible for checking the equipment for suitability for any particular application. Any existing industrial rights of protection must be observed. The
perfect quality of our products is guaranteed under our General Conditions of Sale. Issue: December 2015 HM120_E. Subject to modificati