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  5. HG 135

Room hygrostat HG 135 with switch socket

For humidity control and monitoring – Made in Germany

Ideal for unattended continuous use of dehumidifiers.

If the switching socket of the HG 135 is connected to the mains, then the room hygrostat automatically controls a connected device when the preselectable humidity threshold is exceeded. The optimal solution for flexible humidity-dependent control of humidifiers or dehumidifiers with up to 10 A current consumption. Among others, applicable for dehumidifiers from Trotec up to TTK 400.

The Trotec hygrostats HG 110, HG 120 and HG 135 are technically identical and differ only in their connection type. The HG 110 has a 6.35 mm jack plug. The HG 120 has a 4-pin DIN plug and the HG 135 is offered as a 230 V version with a maximum switching load of 10 A and a CEE 7/3 combination socket.

The external hygrostat HG 135 in combination with the matching dehumidifier serves as a two-point controller for controlling the relative humidity, for example, on indoor construction sites, in basement rooms, in climate control cabinets or for controlled dehumidification of office and computer rooms. Other areas of application are warehousing for goods or foodstuffs, cold storage rooms for fruit and vegetables, greenhouses of horticultural businesses, textile industry, paper and printing industry, film industry, hospitals. Wherever humidity needs to be controlled or monitored, the HG 135 with the associated dehumidifier is generally applicable.

Mode of operation and mounting location

The mounting location should be chosen to ensure a representative humidity measurement, i.e. the humidity readings at the mounting location should match those of the room and the humidistat should be located in the air flow. The room hygrostat responds quickly and accurately to changes in humidity. By adjusting the setpoint knob, the lever system is intervened in such a way that when the set humidity is reached, the internal microswitch is actuated.

The HG 135 fits, among others, the TTK 200 and TTK 400 dehumidifiers from Trotec.
TTK 200 and TTK 400 dehumidifiers from Trotec

Save electricity and money on dehumidification

With our hygrostat HG 135 you save additional money when dehumidifying or keeping humid rooms dry. The programmable switch is simply plugged between the dehumidifier and the socket with the Schuko plug (CEE 7/3) to regulate dehumidification based on the measured humidity.

When the desired target humidity is reached, the hygrostat switches the unit off, noticeably reducing the unit's energy consumption. The initial cost of the energy-saving HG 135 thus pays for itself in a very short time.

Furthermore, many dehumidifiers only have coarse target settings for optimum humidity. The HG 135 hygrostat allows the room humidity to be regulated in 1 % steps between 40 % and 90 % by connected dehumidifiers, thus offering a much more precise target humidity selection.

Dehumidification in continuous operation - wherever it is needed

HG 135 - Use on the construction site
Automatic air humidity regulation on the indoor construction site with the external room humidistat HG 135 with switch socket
HG 135 - Use in the warehouse
Automatic air humidity regulation in the warehouse with the external room hygrostat HG 135 with switch socket
All room hygrostats in direct comparison:

All room hygrostats in direct comparison:

In order to find exactly the right room hygrostat for you, you have the possibility to clearly compare all room hygrostats of the HG series from Trotec.

Models that you do not want to include in the comparison can simply be clicked away.

Technical data in comparison

A few practical benefits:

  • Measuring range: 40 - 90 % r.h.
  • Measuring accuracy: ± 3 % r.h.
  • Working range: 40 - 90 % r.h.
  • with plug and 1.9 m cable

Other room hygrostats


Raumhygrostat HG 135 mit Schaltsteckdose show in Trotec online shop

Technical data

Technical data
General information
  Article number
  Min. regulation range [% r.F.] 40
  Max. regulation range [% r.F.] 90
Measurement accuracy
  +/- RH [%] 3
Ambient temperature
  min. [°C] 0
  max. [°C] 55
Electrical values
  Voltage [V] 230
  Max. switching load [A] 16
Electric connection
  Connection plug CEE 7/3 (Schuko socket type F)
  Cable length [m] 1.9
Safety feature
  Type of protection IP20
  Length (packaging excluded) [mm] 55
  Width (packaging excluded) [mm] 85
  Height (packaging excluded) [mm] 36
  (packaging excluded) [kg] 0.29

 standard equipment

 optionally available

 not available



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