HG800 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
Humidistat t

with Polyga®- humidity measuring elementt
with one or two changeover contactst
with inner rotary knob t
or set point protectiont

HG80
HG80-2
HG80i/-2i
HG80vs

Application
The humidistat type HG80 is used as an on-off controller to control the relative air humidity in air ducts of air conditioning units
and climatic cabinets, and to control air humidifying and dehumidifying. 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, film industry and hospitals.
Description of the Humidistat
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 absorbs
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.
In the case of the humidistat type HG80-2, a second
microswitch is positioned parallel to the first microswitch. After the housing cover has been removed, the
second set value can be finely adjusted at the microswitch lever using a screwdriver. The switch point of the
second microswitch is connected to the switch point
of the first microswitch. The switch distance (neutral
zone) can be set from 0% rel. humidity to +15% rel.
humidity.
The fan shaped measuring element is protected by a
perforated sensor tube and is exposed to the housing.
The humidistats are designed for pressureless systems. The mounting position should be chosen such
that condensed water cannot get into the interior of the
housing. The preferred mounting position is with the
„sensor vertically downwards“ or „sensor horizontal“
(see diagram on the reverse). In the mounting positions described above, a blanking plate in the sensor
tube with a 0.8mm diameter hole will prevent water
getting in.
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.

The humidistat HG80 can be used almost anywhere that air humidity has to be regulated or monitored.
Technical Data
scale range ............................................................. 30...100%rh
measuring accuracyt
tt
for measuring range> 50%rh ........... ±3.5%rh
t
t
for measuring range< 50%rh .............. ±4%rh
range of operation .................................................... 35...95%rh
measuring medium ............... air, pressureless, non-aggressive
switching difference (microswitch) ref. to 50%rh .......
tt
.................................................. approx. 4%rh
switching distance between the microswitches
t
for HG80-2 ................................................. 0...+15%rh
max. voltage ............................................................... 250 V AC
t
t
Please observe the notes on voltage.
t
breaking capacity of the changeover contact
t
ohmic load (cos j=1) ............................. 15A AC 230V
t
inductive load (cos j=0,7) ........................ 2A AC 230V
t
direct voltage ...................................... 0.25A DC 230V
breaking capacity, minimum load ................... 100mA, 125V AC
contact material ................................................................. silver
allowable storage temperature ................................ -30...+60°C
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 ........................................................ 8m/sec
t
with gauze protection (order no. 20.014) ....... 15m/sec
t
with PTFE filter (order no. 23.063) ................ 15 m/sec
time constant T63 at v=2m/sec ....................................... 120 sec
sensor length, material ....................... 220mm, high-grade steel
fixing ...................... slots in the housing base for duct mounting
t
(ord. no. 20.009) ................. console for wall mounting
mounting position ..... sensor vertically downwards or horizontally
connecting terminals ........ for conductor cross sections 1.5mm2
cable connection .................................. via twist nipple M20x1.5
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
housing ................................................................ ABS light grey
type of protection (external rotary knob) ............................ IP 54
type of protection (inner rotary knob HG80i, HG802i) ........ IP64
measuring element .....
....... Polyga®-measuring element, water resistent, washable
weight .................................................................. approx. 0.7 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: February 2016 HG80_E. Subject to