HG1200 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
Room humidistat t

HG120
HG120-2
HG120i
tHG120-2i
with Polyga®- humidity measuring elementt
with one or two changeover contactst
or inner rotary knobt

Type Survey
Type

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 (power factor >0.8)
t
lifetime ......................................... > 6.000 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
optional microswitch up to 10 A
t max. 250VAC and
tt 0.1 ... 10A ohmic load for dehumidifying
tt 0.1 ... 3A ohmic load for humidifying
tt 0.1 ... 1.5A for inductive load (power factor >0.8)
allowable ambient temperature .................................... 0...60°C
air-speed ................................................................. 0.2...8 m/s
installation altitude ........................... ≤ 4.000m above sea level
influence of temperature
t
ref. to 23 °C ................................................. ≤ +/- 0.2 % r.h. / K
typ. response time t50 at v=2m/s .................................... 1.2min
fixing ........................................................ slots in housing base
installation position .................. preferably with ventilation slots
at right-angles to wind direction
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
action .................................................................................. 2.C
rated impulse voltage ........................................................ 4 kV
ball indentation test for temperature ................................ 92°C
housing ................................................. solid plastic, light grey
protective system .............................................................. IP20
degree of pollution ................................................................. 2
dimensions ....................................................... 115x70x47 mm
weight ................................................................. approx. 120 g
Notes on voltage
The measurement location of the humidity controller should
be selected such that there is no build-up 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.

Type of contact

HG120

Technical Data
measuring element ..................... Polyga®-measuring element, t
ttttt
water resistent
control range ........................................................... 40...90%rh

Order no.
42042011

changeover contact: 1 x max. 5 A

HG120-2

42042221

changeover contact: 2 x max. 5 A

HG120i

42042012

changeover contact: 1 x max. 5 A,
with internal scale

HG120-2i

42042222

changeover contact: 2 x max. 5 A,
with internal scale

HG120 10A

42043011

changeover contact: 1 x max. 10 A

Description of the humidistat
The humidity measuring element which is manufactured by
Galltec under the name Polyga®, consists of several plastic fabric
bands each with 90 individual fibres with a diameter of 3 µm each.
The fibres are provided with hygroscopic characteristics by a
special process. The measuring element adsorbs and desorbs
moisture. The effect, swelling predominantly in longitudinal direction, is transmitted via a lever system to a microswitch with
a small switching distance. The measuring element responds
to the change in air humidity. It is possible to adjust the lever
system by setting the adjustment knob so that the microswitch
is actuated when the set air humidity is reached.
The fan shaped measuring element is accomodated inside the
housing and must be protected against coarse dust, dirt and water. The humidistats are designed for pressureless systems. The
installation location must be selected so that condensed water
cannot enter the inside of the housing. The installation position
preferably with ventilation slots at right-angles to wind direction.
In the case of the humidistat type HG120-2, a second microswitch is positioned parallel to the first microswitch. The switch
point of the second microswitch is connected to the switch point
of the first microswitch. The switch distance (neutral zone) is
set by the factory to +6%rh. (If desired other switch distances
up to approx.12%rh can be set by the factory)
Application
The humidistat type HG120 is used as an on-off controller to
control the relative air humidity in climatic cabinets. It is used
to control air humidifying and dehumidifying in offices and computer rooms. Other areas of use are storage of foodstuffs and
luxury foods, cooling rooms for fruit and vegetables, greenhouses for gardening use, the textile industry, the paper and
printing industry, the film industry and hospitals.
The room humidistat HG120-2 is equipped with a 2nd microswitch. It can be used as a 2-level controller or as a max-min
controller.
Room humidistats with internal adjusting knob and scale are
available for all variations. These types have got a lower-case
„i“ at the end, e.g. HG120i.

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 HG120_e. Subject to mo