Home Products Sensor OTT TRH – Temperature and Humidity Sensor
Cảm Biến Nhiệt Ẩm OTT TRH
Cảm Biến Nhiệt Ẩm OTT TRH

OTT TRH – Temperature and Humidity Sensor

The OTT TRH is a compact sensor designed to measure relative humidity and air temperature.

In addition, it is capable of calculating parameters such as absolute humidity and dew point, and transmits data via the SDI-12 interface.

The sensor includes a protective cap that prevents dust and debris from entering the sensing elements. The optional weather shield provides additional protection against environmental conditions and solar radiation.

OTT TRH Temperature and Humidity Sensor

 

  • Calculates absolute humidity, dew point, and mixing ratio in addition to outputting measured values

  • Offers long-term stability and reliable operation in extreme temperatures (–40 °C to +80 °C)

  • High durability thanks to its compact and robust design; the protective cap with metal mesh filter shields against dust, debris, and insects

  • Ultra-low power consumption

  • Easily integrates with SDI-12 data loggers, such as the OTT netDL, via SDI-12 (V1.3 protocol)

 

 

OTT RS7 Radiation and Weather Shield

 

  • Naturally ventilated housing with 7 lamella plates

  • Constructed from UV-resistant plastic designed to withstand harsh weather conditions

  • Features white outer coating and black inner coating to minimize radiative heating

  • Includes a stainless steel mounting bracket for easy installation on horizontal or vertical poles

  • Tool-free sensor installation – simply insert and tighten the screw

OTT TRH Temperature and Humidity Sensor

Sensor Output Data  
Direct measurements

Temperature (°C or °F), Relative Humidity (%)
Calculated values Absolute Humidity (g/m³), Dew Point (°C or °F), Mixing Ratio (g/kg)
Relative Humidity  
Measurement range 0 … 100 % RH

Accuracy at 25 °C and 4.5 – 15 VDC

Max. ±2 % RH (from 0 to 90 % RH)

Max. ±3 % RH (from 90 to 100 % RH)
Resolution 0.10 %
Repeatability ±0.1 % RH
Hysteresis <1 % RH
Long-term stability typically < ±1.5 %/year
Response time with protective cap RH90 ~ <15 s (at 0.35 m/s airflow)
Temperature  
Sensor type PT1000 DIN A
Measurement range -40 °C … +80 °C
Accuracy ±0.1 °C at 20 °C
±0.5 °C at -40 °C and +80 °C (linearity)
Resolution 0.01 °C
Response time with protective cap T90 <300 s (airflow 1 m/s)
T90 <250 s (airflow 2 m/s)
Absolute Humidity  
Measurement range 0 … 1000 g/m³
Resolution 0.1 g/m³
Dew Point  
Measurement range -40 °C … +80 °C
Resolution 0.01 °C
Interface & Power Supply  
Interface SDI-12
Supply voltage 4.5 V DC … 28 V DC
Power consumption  
Standby < 20 µA at 12 V
During temperature measurement approx. 550 µA
During humidity measurement approx. 260 µA
Environmental Conditions  
Operating temperature -40 °C … +80 °C
Storage temperature -50 °C … +80 °C
Operating humidity 0 … 100 % RH
Protection rating IP65
Sensor protection Protective cap with metal mesh filter
Materials and Dimensions  
Sensor housing Polycarbonate
Sensor dimensions Ø 12 mm x 140 mm
Cable PUR (black), molded, with shielding
Available cable lengths 3.5 m and 10 m
Wire color coding Printed directly on the sensor body
Standards EG (2004/108/EG), EN 61326-1:2006

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