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TRH-300 Series Temperature / Humidity Transmitters
TRH-303W Wall Type
TRH-302D Duct Type
TRH-303S Separated Type
Specifications (TRH-301 / 302 / 303)
Measuring Range: Temp 0~100°C (options −20~+80°C, 0~50°C, −40~+60°C); RH 0~100%RH
Accuracy (25°C): ±2%RH, ±0.3°C
Stability: better than 1%RH/year (typ.)
Temperature Compensation: ±0.008%RH/°C
Response Time: <15 s (90% at +25°C, 0.5 m/s moving air)
RH Sensor: Thin-film capacitor
Temperature Sensor: RTD Pt100, DIN IEC751
Signal Output: RH 4–20mA two-wire; Temp 4–20mA two-wire (selectable)
Selectable Voltage Outputs: 0–1V, 0–5V, 0–10V, 1–5V
Supply Voltage: 12–36 VDC
Enclosure: ABS, IP65; optional sensor filter TR-3066
Cable Gland: Liquid-tight nylon, for 5–10 mm cables
Operating Ambient: −40~+85°C (−40~+185°F)
Weight: approx. 150 g
Wiring (Two-Wire 4–20mA)
Connect (+) to supply positive; the (−) terminal carries the loop signal to the controller’s (+), then back to supply (−).
TRH-303 Application
Measures temperature and humidity simultaneously and transmits values (current/voltage) to displays or back-end systems; resistant to moisture, dust, oil, and common chemicals.
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Ordering Information
Model: TRH-301 (Temperature) · TRH-302 (Humidity) · TRH-303 (Temp./RH)
Mounting Shape: W = Wall · D = Duct · S = Separated
Specify: Measuring ranges & output signal (Current 4–20mA or Voltage 0–1V / 0–5V / 0–10V / 1–5V)
Certificate: CE
Variants: TRH-300W (Wall) · TRH-300D (Duct) · TRH-300S (Separated)