• Galltec HG80 Humidistat Series
  • Galltec HG80 Humidistat Series

Galltec HG80 Humidistat Series

Measuring element:Polyga®-measuring element
Measuring medium:Air / Pressureless / Non-aggressive
Control range:40 ... 90% RH
Operating temperatur: 0...60°C
Accuracy: > 50% RH(± 3.5% RH) / < 50% RH(± 4% RH)
Protection:IP50
Model : Galltec HG80

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 3 µm. 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%RH to +15%RH.

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 0.8 mm diameter hole will prevent water getting in.
Technical Data
measuring element ....................... Polyga®-measuring element, water resistent, washable
measuring accuracy
for measuring range > 50% RH .................... ± 3.5% RH
for measuring range < 50% RH ....................... ± 4% RH
medium temp. coefficient rel. to 23°C ................. ≤ ± 0.2% RH / K 
typ. time constant t63 at v=2 m/sec ........................ 120 sec
adjustment ........................... at average air pressure 430 m NN
measuring medium ............... air, pressureless, non-aggressive
control range .............................................. 40 ... 90% RH
switching differential........................................... 4 ... 8% RH
switching distance between
HG80-2 microswitches, adjustable ......... 0 ... + 15% RH
life time .......................................... > 100.000 breaking cycles

microswitch with silver contact
max. breaking capacity
alternating current
ohmic load 15 A 250 V AC
inductive load (power factor > 0,8) 2 A 250 V AC
direct current, exp.
0.25 A 250 V DC
0.5 A 125 V DC
min. switching current 100 mA1)

microswitch with gold contact
max. breaking capacity 1 A 125 V AC
min. switching current 1 mA1)

1) not relevant when switching at high-resistance loads (>10 kOhm) for example logical levels.

Please observe the notes on voltage.
allowable storage temperature ........................ -30...+60°C
allowable operating temperature ....................... 0...60°C
allowable air speed .............................................. 8 m / sec
with gauze protection (order no. 20.014) ....... 15 m / sec
with PTFE filter (order no. 23.063) ................ 15 m / sec
housing .......................................................... ABS light grey
type of protection (external rotary knob) ....................... IP 50
type of protection (inner rotary knob HG80i, HG802i) ........ IP64
sensor length, material ................. 220 mm, high-grade steel
fixing ................ slots in the housing base for duct mounting
(ord. no. 20.009) ................. console for wall mounting
mounting position ..... sensor vertically downwards or horizontally
connecting terminals ........ for conductor cross sections 1.5 mm²
cable connection ........................ via twist nipple M20 x 1.5
weight .............................................................. approx. 0.7 kg

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.