Temperature/Relative Humidity (8m cable) Smart Sensor (S-THC-M008)

The Temperature/Relative Humidity Smart Sensor is designed to work with all Onset data loggers that accept smart sensors. All sensor parameters are stored inside the smart sensor, which automatically communicates configuration data information to the logger without any programming, calibration, or extensive user setup.

If a 2m cable is preferred, please see Temperature/Relative Humidity (2m cable) Smart Sensor.

Also available in a wireless model for use with the HOBOnet Field Monitoring System.



  • Smart sensor
  • Works with all loggers that accept smart sensor inputs
  • Automatically communicates configuration data to the logger


Measurement RangeTemp: -40°C to 75°C (-40°F to 167°F)
RH: 0-100%* RH at -40° to 75°C (-40° to 167°F); exposure to conditions below -20°C (-4°F) or above 95% RH may temporarily increase the maximum RH sensor error by an additional 1% Accuracy
Temp: ±0.25°C from -40° to 0°C (±0.45°F from -40° to 32°F); ±0.20°C from 0° to 70°C (±0.36°F from 32° to 158°F); ±0.25°C from 70° to 75°C (±0.45°F from 158° to 167°F)
RH: ±2.5% from 10% to 90% RH (typical), to a maximum of ±3.5% including hysteresis at 25°C (77°F); below 10% and above 90% ±5% typical Resolution
Temp: 0.02°C
RH: 0.01% RH


Bits Per Sample
Temp: 16
RH: 16

Temp: < 0.01°C (0.18°F) per year
RH: < 1% per year typical

Response Time (typical, to 90% of change)Temp: Without solar radiation shield: 3 minutes, 45 seconds in air moving 1 m/s; With RS3-B solar radiation shield: 6 minutes, 30 seconds in air moving 1 m/s
RH: Without solar radiation shield: 15 seconds in air moving 1 m/s; With RS3-B solar radiation shield: 30 seconds in air moving 1 m/s Operating temperature range: -40°C to 75°C (-40°F to 167°F)
Environmental rating: Weatherproof: 0 to 100% RH intermittent condensing environments. For best results, protect the Temp/RH sensor from sunlight and direct splashing by mounting it inside a protective enclosure, such as a solar radiation shield.
Housing: PVC cable jacket with ASA styrene polymer RH sensor cap; modified hydrophobic polyethersulfone membraneSensor dimensions: 45.97 x 11.43 x 10.16 mm (1.81 x 0.45 x 0.40 inches)
Weight: 180 g (6.35 oz)
Number of data channels**: 2
Measurement averaging option: No
Cable lengths available: 8 m (26.2 ft)
Length of Smart Sensor network cable: 6 m (19.6 ft). CE Compliant The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).UKCA - UK Declaration of Conformity The UKCA Mark identifies this product as complying with all relevant directives in the UK Declaration of Conformity.


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