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Rack mount hygrometer thermometer with Ethernet interface and relay

Reference AR004758


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  • temperature and humidity.
  • Two relay outputs.
  • Designed for online monitoring.
  • Polymer humidity sensor.

Product features Rack mount hygrometer thermometer with Ethernet interface and relay


Sensor with sensors for measuring temperature and relative humidity on the cable and with two output relays.

For 19 "rack mounting - height 1 rack unit 1U.

Conversion to Humidex.

The H3531R sensor is designed for online monitoring of temperature, relative humidity without aggressive substances.

The device is equipped with three binary inputs for the detection of the delivery variables.

The control of connected devices is possible by means of two integrated relays.

State-of-the-art polymer humidity sensor ensures long-term data stability and resistance to water condensate.

The measured temperature and relative humidity are then converted to other expressions of humidity - dew point temperature, absolute humidity, specific humidity, mixing ratio or specific enthalpy.

The sensor is supplied as standard with a T + RV probe on a 1 meter cable. A 2 or 4 meter cable can be ordered at an additional cost.

Processing and analysis of measured data

  • online in COMET Cloud
  • COMET database software
  • integration into third-party systems 


  • H3531R
  • Manual
  • Traceable calibration certificate
  • Free Tsensor configuration software
  • COMET Cloud for 3 months


- Temperature
- Relative humidity
- Calculated values ​​(dew point, etc.)
- Two state signal

Relative humidity measurement range: 0 to 100%

Relative humidity measurement uncertainty: ± 2.5% RH from 5 to 95% at 23 ° C

Temperature measurement uncertainty: ± 0.4 ° C

Resolution: 0.1 ° C, 0.1% RH

Measuring interval: 2s

available units: Degrees Celsius, Fahrenheit

Calculated values: Dew point, absolute humidity, specific humidity, mixing ratio, specific enthalpy

Uncertainty and dew point measurement range: ± 1.5 ° C at ambient temperature T <25 ° C and RH> 30%
range from -60 to + 80 ° C

Uncertainty and specific humidity range: ± 1.5g / m3 at ambient temperature T <25 ° C
range from 0 to 400g / m3

Uncertainty and specific humidity range: ± 2g / kg at ambient temperature T <35 ° C
range 0 to 550g / kg

Uncertainty and ratio range of mixtures: ± 2g / kg at ambient temperature T <35 ° C
range 0 to 995g / kg

Uncertainty and specific enthalpy range: ± 3kJ / kg at ambient temperature T <25 ° C
range 0 to 995kJ / kg

Temperature compensation of the humidity sensor: The whole range of temperatures

Temperature operating range: -30 to + 80 ° C

Protection class: IP30

Number of relay outputs: 2

Maximum switching voltage, current and relay output power: 50V, 2A, 60VA

Number of binary inputs: 3

Signal for binary inputs: Dry contact, open collector, or two-state voltage signal.
The inputs are not galvanically isolated.

Minimum pulse duration at binary input: 500ms

low tension : 0 to + 0.5V

high tension : +3.0 to + 30V

Audible alarm: Integrated - disconnectable

LAN connection: RJ-45 connector, 10Base-T or 100Base-TX

Communication protocols: WWW, ModbusTCP, SNMPv1, SOAP

Alarm protocols: E-mail (SMTP authentication is supported), SNMP Trap, Syslog

Configuration: T-sensor, Telnet, keyboard

Liquid crystal display temperature operating range: Reading possible at + 70 ° C, it is recommended to switch off above + 70 ° C

Hood filtering capacity: 0.025mm - Filter with stainless steel mesh

Supply : 12Vdc, maximum consumption 1W

Cable d: Coaxial, diameter 5,5 x 2,1 mm

Cable length: 1m, 2m or 4m optional

Dimensions: 483 x 44 x 45 mm (W x H x D), one 19 "1U rack unit

Weight: about 1090g - 1m of cable

Warranty: 3 years 

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