Temperature / Humidity Transmitter(TRH-301. 302 303) Product ID: TRH-301. 302 303

TRH-300 series utilizes a thin-film polymer capacitor to sense relative humidity, and a thin-film RTD to accurately sense temperature.
TRH-301 Temperature transmitter
TRH-302 Humidity transmitter
TRH-303 Temp./humi. Transmitter
Fast, stable and accurate.
Watertight enclosure.
Compact size, Easy mounting.
Excellent Long-term stability.
Wide input voltage range.(12Vdc~40Vdc)
Available with either Current or Voltage output.
On-site, Two point calibration. (Zero and span)

  • Specification:
    • TRH-301, 302, 303 Measuring Range:
    • 0~100°C (-20~+80°C, 0~50°C, -40~+60°C available)
    • 0~100% RH
    • Accuracy: (at 25°C)
    • ±2% RH, ±0.3°C
    • stability:
    • Better than 1% RH per year (Typical)
    • Temperature compensation:
    • ±0.008% RH / °C (Effect @ 0% RH)
    • Response time:
    • < 15 seconds (90% at +25°C in moving air at 0.5 M/S )
    • Senosr Humidity: Thin-film capacitor
    • Temperature: RTD Pt 100 Ohm DIN, IEC751
    • Signal output: Humi: 4~20mA Two wire
    • Temp: 4~20mA Two wire (selectable)
    • Selectable output signal : 0 to 1 V, 0 to 5 V, 0 to 10 V or 1 to 5V. (option)
    • Working Voltage:12~36 VDC
    • Sensor protection: Sensor filter, Part No. TR-3066. (option )
    • ABS plastic watertight enclosure (IP 65)
    • Connection Liquid-tight nylon, cable Bushing: 5-10mm cables
    • Working ambient: -40~+85°C (-40~+185°F)
    • Weight: Approx. 150 g
  • Ordern Information:
    • Model :
    • TRH-301 Temperature transmitter
    • TRH-302 Humidity transmitter
    • TRH-303 Temp./humi. Transmitter
    • Shape (Mounting)
    • W : Wall Mount Type
    • D : Duct mount Type
    • S: Separated Type
    • Specify: Measuring ranges and output signal Current 4~20mA or Voltage (Option 0~1V, 0~5V, 0~10V, 1 ~5V )

Temperature Humidity Tranmitter TRH-303, Large LED panel display TRH-3306D + VR-71 Voltage Data logger Video Demonstration

[iframe src=""http://www.youtube.com/embed/HzLgSh7sZDw"" frameborder=""0"" width=""560"" height=""315""][/iframe]


Application and usage for Temperature humidity transmitter to connect with big LED display as per your design.

Model: TRH-3306D Large LED display + TRH-303W

Model: TRH-3306C Lare LED Display + TRH-301W Temperature Transmitter

Temperature humidity tranmitter Model: TRH-203

Download English DM



TRH-203 Tempeature Humidity Transmitter + TRH-3306D LED Display
Download English DM


The pictures shown below are TRH-303RS Temperature Humidity Transmitter with Radiation Shield for outdoor usage.

Model: TRH-303RS