Galltec-Mela logo Humidity measuring technology - high quality

Technical data

Measuring element
Control range
40...90 % RH
>6000 switching cycles
Accuracy at 23 °C
Influence of temp. at 23 °C
≤ ±3 % RH (at 48 % RH)
≤ ± 0.2 % RH / K
Changeover contact max. 5 A
Breaking capacity max. 250 V AC
Ohmic load, dehumidification 0.1...5A
Ohmic load, humidification 0.1...2A
Inductive load 0.1...1A (power factor >0.8)
Gold contact max. 100 mA
Breaking capacity max. 250 V AC and
1...100 mA

Indoor humidistat Hygroswitch

ON/OFF controller, water-resistant POLYGA® measuring element


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

On-off controller
The room humidistat Hygroswitch is an on-off controller. 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 Hygroswitch-i version has the external adjustment knob replaced with an adjustment wheel with a scale inside the housing. This makes unauthorized adjustments more difficult.

Often used in

  • Agriculture & food industry
  • Bakery technology
  • Building construction
  • Cooling & air conditioning
  • Cooling & air conditioning in trains
  • Energy and environmental technologies
  • Environmental technology
  • Green house technology
  • HVAC and building automation
  • Maturing of food
  • Museums & archives
  • Offices & public buildings
  • Paper & print
  • Private homes
  • Storage
  • Storage & transport of fruits, vegetables, meat
  • Swimming pools & Spa
  • Warehousing
  • Warehousing and transport
  • Wind turbines
  • Wine cellar, cabinets and storage
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