ST-341 Temperature & Humidity Transmitter – 4–20mA Output

The ST-341 Temperature and Humidity Transmitter is a high-accuracy industrial sensor designed to deliver stable, reliable measurements of both relative humidity (RH) and ambient temperature. Ideal for HVAC systems, environmental control, and industrial process monitoring, the ST-341 uses a 4–20mA analogue output, ensuring noise-immune, long-distance signal transmission for integration with PLCs, BMS systems, and automation controllers.

Built with a long-life capacitive humidity sensor and precision temperature element, the ST-341 provides fast response, excellent repeatability, and low drift. Its durable enclosure makes it suitable for challenging industrial environments while maintaining accurate long-term performance.

 Key Features

Combined Temperature & Humidity Measurement

Accurate dual-parameter sensing for complete environmental monitoring.

4–20mA Output Signal

Industry-standard analogue output ensures compatibility with PLCs, BMS systems, controllers, and industrial monitoring equipment.

Wide Measurement Ranges

• Humidity: 0–100% RH

• Temperature: Model-dependent; ideal for indoor and light industrial settings

Fast Response & Low Drift

Advanced capacitive RH sensor and precision temperature probe deliver long-term stability with minimal recalibration.

Durable Industrial Housing

ABS/polycarbonate enclosure protects sensors from dust and ambient contaminants.

Easy Installation

Compact design with screw terminals for simple wall, duct, or panel mounting.

 Technical Specifications

• Model: ST-341

• Outputs: 4–20mA

• Humidity Range: 0–100% RH

• Temperature Range: −20°C to +80°C

• Accuracy:

  • Humidity: ±1% to ±3% RH

  • Temperature: Model-dependent precision sensor

• Long-Term Stability: <0.5% RH drift per year

• Response Time: <10 seconds

• Power Supply: 12–24V DC

• Sensor Types:

  • Capacitive polymer humidity sensor

  • Precision temperature sensor

• Housing Material: ABS or polycarbonate

• Protection Rating: IP54

• Electrical Connection: Screw terminal block

• Mounting Options: Wall mount 

 Applications

• HVAC & building automation

• Environmental monitoring systems

• Industrial drying & storage areas

• Greenhouses & agricultural climate control

• Cleanrooms and laboratory environments

• Factory process and equipment room monitoring

• Data centres & IT cooling systems

 Benefits

• Accurate long-term measurement of both humidity and temperature

• Industrial-grade, interference-resistant 4–20mA output

• Suitable for large installations and long cable runs

• Minimal maintenance and reduced need for recalibration

• Supports stable, energy-efficient climate control