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Rotronic HS5 Hygrostat and Thermostat


The transmitters in the HS5 series are progressive transmitters for accurate measurement of relative humidity and temperature and can convert these to psychrometric parameters as required by the application concerned. Their measurement results can be read out via analog outputs or Ethernet. A relay switches when the switching threshold that has been set is reached. The instruments measure with interchangeable HygroClip2 probes, enabling an unprecedented class of accuracy. The HS5 boasts a unique calibration and adjustment process and many other unbeatable features. At the same time ROTRONIC has also improved the sensor technology, taking humidity and temperature measurement to a whole new level of performance and reliability: the HS5 transmitters offer repeatability of < 0.02 %RH and with the HC2-S guaranteed system accuracy of < 0.8 %RH and 0.1 K.

The Applications

The HS5 series is ideal for wherever exact measurement of humidity and temperature is of critical importance: in the food and pharmaceutical industries, printing and paper industries, meteorology, the agricultural sector, archeology, HVAC applications, etc. There is hardly a sector today in which these parameters can be ignored. The measurement task in question ultimately defines which instrument best covers your needs.


  • Measures relative humidity and temperature
  • All psychrometric calculations available
  • Outstanding accuracy and repeatability
  • Highest precision
  • Dry mechanical relay
  • Digital communication via Ethernet
  • Freely scalable analog signals
  • Update possible via the Internet


Device type Hygrostat and thermostat
Probe type All HygroClip2 probes
Parameters Relative humidity and temperature
Range of application -40…60 °C / 0...90 %RH
-10…60 °C / 0...90 %RH with LCD
Accuracy at 23 ±5 °C Prob dependent
Measurement ranges Probe dependent
Switch output 1 relay (freely configurable)
Switching capacity <50 VAC / <75 VDC / <1 A
Power supply / Power consumption 15…40 VDC / 12…28 VAC
<70 mA (Ethernet version <150 mA)
Response time t 63 Probe dependent
Psychrometric calculations Yes
Electrical connections 1 x M16 x 1.5, to terminals
Initialisation time <5 s
Measurement interval 1 s
Display type Illuminated graphic LCD
Menu Navigation 4 keys (in version with display)
Trend indicator Yes
Firmware update Via HW4 software
External datalogging 2000 Records
Circuit type 3-wire
Analog outputs 2, freely configurable
Analog output signal (standard) 0...10 V, 4...20 mA, freely scalable
Automatic load compensation Yes
Relay type and number Changeover switch
Communication interfaces Ethernet
Service Interface UART
Housing ABS
IP protection rating IP65
Fire protection class Complies UL94-HB
Mounting position Wall Mounting
FDA / GAMP FDA 21 CFR part 11 / GAMP5
Temperature adjustment Via keyboard 1-point
Via software 2-point
Humidity adjustment Via keyboard/software: multi-point
CE / EMC conform EMC Directive 2004/108/EC
Dimensions 129 x 72 x 45
Weight 240 g


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