Hygrostats

Hygrostats are electronic devices that are designed to control the relative air humidity levels inside enclosures to prevent the formation of condensation and corrosion and damage to electrical components.

How do hygrostats work

Hygrostats respond to humidity range and not temperature. They are typically stored within enclosures and connected to enclosure heaters. If the pre-set humidity level is reached, the hygrostat will turn on the heater or fan to raise the condensation point or the dew point, which will prevent any malfunction or damage to the electrical components and systems that could be caused by corrosion or condensation.

Some devices and systems use a combination of hygrostats and enclosure thermostats to prevent condensation build-up and ensure that the temperature inside the control cabinet is correct.

What are hygrostats used for?

Hygrostats are used to maintain critical relative humidity range in components and systems such as:

  • Telecommunication systems
  • Ticket dispensers
  • Electrical and electronic enclosures
  • Display panels
  • Automatic teller machines (ATM’s)
  • Parking and access control systems

Hygrostats can also be used to control warning lights, cooling fans and other devices.


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Description Price Adjustable or Preset Mount Type Activation Humidity Supply Voltage Maximum Humidity Setting Minimum Humidity Setting Series
RS Stock No. 697-4421
Mfr. Part No.01245.9-00
BrandSTEGO
£42.01
Each
Units
Adjustable DIN Rail 40 → 90%RH 120 V ac 90%RH 40%RH -
RS Stock No. 697-4427
Mfr. Part No.01246.0-00
BrandSTEGO
£42.28
Each
Units
Preset DIN Rail 65%RH 230 V ac - - -
RS Stock No. 785-8092
Mfr. Part No.01231.0-01
BrandSTEGO
£100.89
Each
Units
- - 50 → 90%RH 100 → 240 V ac 90%RH 50%RH -
RS Stock No. 697-4424
Mfr. Part No.01245.0-00
BrandSTEGO
£45.95
Each
Units
Adjustable DIN Rail 40 → 90%RH 230 V ac 90%RH 40%RH -
RS Stock No. 785-8089
Mfr. Part No.01230.0-00
BrandSTEGO
£99.12
Each
Units
- - 50 → 90%RH 100 → 240 V ac 90%RH 50%RH -
RS Stock No. 785-8083
Mfr. Part No.01230.1-00
BrandSTEGO
£105.21
Each
Units
- - 50 → 90%RH 24 → 48 V dc 90%RH 50%RH -
RS Stock No. 901-0595
Mfr. Part No.01245.2-00
BrandSTEGO
£86.53
Each
Units
Adjustable DIN Rail 40 → 90%RH 12 → 48 V dc 90%RH 40%RH -