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Sigma Automation

Humidity and Temperature Transmitter

Features :

  • Fast, Stable and accurate
  • IP 65 - Watertight enclosure
  • Excellent long term stability
  • Onsite two point calibration


Typical Areas of Application

  • Climatic Rooms/Chambers
  • HVAC Installations
  • Green Houses
  • Paper Industries
  • Incubators, Ovens
  • Textile Industries
  • Storage Area
  • Food Processing Industries
  • Fruit/Vegetable Storage

TRH-30x Series uses a thin film polymer capacitor to sense Relative Humidity & a thin film RTD to accurately sense Temperature. The Output signal given is 4 - 20 mA analog output requiring a current loop supply of 12 - 30 VDC. The electronics is housed in awatertight IP-65 enclosure.

Technical Specifications

Measuring Range 5 to 95% RH
0 to 70°C
0 Accuracy @ 25oC ± 2% RH , ± 0.3° C
Sensors Humidity : Thin-film Capacitor
Temperature : Pt100
Electronics Operating temp 0 to 50°C
Response <15 sec
Long-term Stability Better than 1% RH per year
Output 4-20mA (0~100%RH; 0~100ºC) other outputs on request
Load Resistance Maximum 300 Ohms
Supply Voltage 12 to 30 VDC
Housing ABS plastic watertight enclosure
Protection IP-65
Weight Approx 180gms

Ordering Information

Model Descriptions
TRH - 304 Humidity / Temperature Transmitter
TRH - 305 Humidity Transmitter
SHAPE (Mounting) W Wall Mount Type
D Duct Mount Type
S Separated Type

On-Site Calibration & Wiring

On-Site Calibration & Wiring

Wall Mount Type

Wall Mount Type

Duct Mount Type

Duct Mount Type



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Contact Us

Sigma Automation

No 121, {Opp. Nalanda Vidhya Peeta}, J.C. Industrial Estate, Yelechenahalli, Kanakapura Main Road, Bangalore, Karnataka - 560062, India

Mobile : +91-9886674122

Phone : +91-80-26860714

Call Us : 08069247352 Ext : 263