Galltec-Mela logo Humidity measuring technology - high quality

Technical data

Measuring element
Control range
Hygroscopic POLYGA®
40...90 % RH
Accuracy at > 50 % RH
Accuracy at < 50 % RH
Influence of temperature
≤ ±3.5 % RH
≤ ±4 % RH
-0.2 % RH / K
based on 20 °C and 50 % RH
Silver contact
Ohmic load
Inductive load (power factor >0,8)
Direct voltage
Breaking capacity, alternating current
15 A / 250 V AC
2 A / 250 V AC
0.25 A / 250 V DC
0.5 A / 125 V DC

Breaking capacity, min. load 100 mA
Gold contact
Breaking capacity 15 A / 250 V AC
Breaking capacity, min. load 1 mA

Duct humidistat HG80

Humidistats with no external power supply required - very robust and reliable.


  • Operating temp. up to 60 °C
  • Accuracy: ±3,5 % RH
  • Robust
  • Long-term stability
  • Washable Polyga® measuring element
  • High accuracy in the high humidity range
  • No external power supply required

On-off controller
The humidistat type HG80 is used as an on-off controller to control the relative air humidity. 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.

Remarkably straightforward and durable design
Our Humidistats feature a simple and robust design. The Polyga® measuring element is a unique hygroscopic fibre that changes its length depending on the humidity. The changes in length of the POLYGA® fibres are transferred via a lever system to a microswitch, resulting in an on/off controller that needs no auxiliary power supply.

Waterresistent and maintenance-free
It has unparalleled long-term stability and is 100 % waterproof, which makes it ideal for use in high humidity. In pure ambient air the measurement element is maintenance-free.

Internal scale and adjusting knob
The HG80-i version was designed so that the control knob and scale are inside the housing. This makes unauthorized adjustments more difficult.

HG80-2 Two-point controller with two changeover contacts
HG80vs – With a set value adjustment lock available

Often used in

  • Agriculture & food industry
  • Bakery technology
  • Building construction
  • Cooling & air conditioning
  • Cooling & air conditioning in trains
  • Drying of tea, corn, meat
  • Drying plants
  • Food technology
  • Green house technology
  • HVAC and building automation
  • Maturing of food
  • Museums & archives
  • Offices & public buildings
  • Paper & print
  • Process and factory automation
  • Storage
  • Storage & transport of fruits, vegetables, meat
  • Swimming pools & Spa
  • Warehousing
  • Warehousing and transport
  • Weather stations
  • Wine cellar, cabinets and storage
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