OTT HydroMet

- Model TRH - Digital Weather Sensor

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The compact, long-term stability weather sensor OTT TRH is responsible for the measurement of relative humidity and temperature. In addition it can calculate the values for absolute humidity, dew point and mixing ratio and output these via the SDI-12 interface. A protective cap prevents dust and dirt from entering the sensor system. The included protective housing provides weather and radiation protection.

  • Parameters measured: Air temperature and relative air humidity (measured), absolute air humidity, dewpoint and mixing ratio (calculated)
  • Measurement technology: PT1000, capacitive
  • Product Highlights: Low power draw, long-term stable, suitable for extreme temperatures, protective housing included
  • Interface: SDI-12 V1.3

OTT TR2O Sensor

  • Calculation of absolute humidity, dew point and mixing ratio in addition to output of measured values
  • Long-term stable, can be used in extreme temperatures (– 40 °C to +80 °C)
  • Long service life thanks to rugged and compact design; a protective cap including metal grid filter provides protection against dirt, dust and insects
  • Very low power consumption
  • Easy conntection to SDI-12 data logger, e.g.OTT netDL via digital interface SDI-12 (protocol V1.3)

OTT RS7 Weather and Radiation Protection

  • Naturally vented protective housing fitted with 7 lamellae
  • UV- and weather resistant plastic
  • White outside coating and black inside coating for optimum protection against radiant heat
  • Practical stainless steel bracket for easy installation to horizontal or vertical pipes
  • Sensor is easily installed – simply insert it and tighten screw

OTT TRH is used in automatic weather stations, often together with  the OTT Pluvio2 series precipitation gauges:

  • in meteorology and hydrology
  • in environmental monitoring
  • in research projects
  • in agriculture and forestry

  • Sensor TR2O:
  • Sensor output:
    • measured: Temperature in °C or °F, relative humidity in %
    • calculated: Absolute humidity in g/m³, dew point in °C or °F, mixing ratio in g/kg
  • Relative humidity:
    • Measuring range: 0 ... 100 % RH
    • Accuracy at 25 °C and 4.5 V DC ...15 V DC* (incl. repeatability, hysteresis and calibration uncertainty): max. ±2 % RH ( 0 90 % RH)**; max. ±3 % RH ( 90 100 % RH)**
    • *for supply voltages of>15V DC, other accuracy values apply
    • **temperature dependency:
    • Resolution: 0.10%
    • Repeatability: ±0.1 %RH
    • Hysteresis:
    • Long-term stability: typ. < ±1.5 %/year
    • Response time wtih protection cap: RH90 typ.
  • Temperature:
    • Sensor: PT1000 DIN A
    • Measuring range: -40 °C ... +80 °C
    • Accuracy at 4.5 V DC ...15 V DC*: ±0.1 °C at 20 °C; ±0.5 °C at -40 °C, 80 °C linearity
    • Resolution: 0.01 °C
    • Response time wtih protection cap: T90
  • Absolute humidity:
    • Measuring range: 0 ... 1000 g/m³
    • Resolution: 0.1 g/m³
  • Dew point:
    • Measuring range: -40 °C ... +80 °C
    • Resolution: 0.01 °C
  • Mixing ratio:
    • Measuring range: 0 ... 1000 g/kg
    • Resolution: 0.1 g/kg
    • Interface: SDI-12 V1.3
  • Supply voltage: 4.5 V DC ... 28 V DC
  • Current consumption:
    • Quiescent: < 20 µA at 12 V
    • Temperature measurement: typ. 550 µA
    • Humidity measurement: typ. 260 µA
  • Ambient conditions:
    • Operating temperature: -40 °C ... +80 °C
    • Storage temperature: -50 °C ... +80 °C
    • Operating humidity: 0 ... 100 % RH
  • Protection class: IP65
  • Sensor protection: Protection cap with metal grid filter
  • Material and dimensions:
    • Housing sensor: Polycarbonate
    • Dimension sensor: Ø 12 mm x 140 mm
    • Material cable: PUR (black), moulded/shielded
    • Cable length: 3.5 m
  • Wiring: color code printed on housing
  • Standards: EG (2004/108/EG), EN 61326-1:2006
  • OTT RS7 Weather and Radiation Protection:
  • Number of lamellae: 7
  • Operating temperature: -40 °C ... +80 °C
  • Material and dimensions:
    • Lamellae: 2 components (PS, PA)
    • Bracket: stainless steel
    • Height incl. mount: 230 mm
  • Weight (without sensor): 700 g
  • Pole/pipe diameter for installation:
    • horizontal (pipe): 3/4 ... 5/4 inch (27 mm ... 43 mm)
    • vertikal (pole/pipe): 1 ... 2 inch (27 mm ... 60 mm)

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