Precision Temperature Sensor TST300

High-Accuracy Temperature Measurement TST300

TST300 represents a high-precision temperature sensor featuring a MODBUS RTU interface. It operates without the need for an external power source, drawing its power directly from the interface. This makes it an ideal choice for applications demanding accurate temperature monitoring and control.

The sensor combines a band-gap temperature sensor element with advanced signal processing, ensuring a fully calibrated digital output. It arrives pre-calibrated from the factory, assuring accurate temperature measurements.

Its applications cater to environments requiring exact temperature oversight, such as server rooms, offices, and pharmaceutical or food storage. Smart office setups, data loggers, and thermostats also benefit from its precision.

TST300 delivers remarkable accuracy, with deviations as low as ±0.13°C within the +20 to +60°C range. Its 12-bit precision stems from the built-in digital-to-analog converter. Power consumption remains minimal, staying under 5mA, and it operates at a supply voltage between 4 and 5.5VDC.

Communication occurs through an RS-485 interface, with each sensor boasting a unique serial code. This allows seamless support for multiple sensors on the same RS-485 bus.

For simplified connectivity, the digital temperature sensor employs two RJ45 connectors, enabling effortless daisy-chained wiring. Standard UTP/FTP patch LAN cables link the sensors to the controller with ease.


  • Exceptional ±0.13°C accuracy within +20°C to +60°C range
  • High 14-bit resolution
  • User-friendly daisy chain connections
  • IP20-rated for protection
  • Low power consumption
  • Each device comes with a unique 64-bit serial number


  • Monitoring and logging temperature in server rooms and data centers
  • Temperature tracking in mobile operator facilities, vineyards, greenhouses, etc.
  • Monitoring and logging temperature in food and drug storage facilities
  • Environmental quality monitoring and assessment
  • Temperature management in building control systems

This precision temperature sensor is compatible with:

  • Temperature and humidity data logger TCW210-TH
  • GSM-GPRS remote IO module TCG140
  • Third-party MODBUS RTU master devices

Technical Properties:

  • Physical characteristics
  • Dimensions: 85 x 35.1 x 23.5mm
  • Weight: 40g
  • Environmental limits
  • Operating temperature range: -20 to 60°C
  • Operating relative humidity range: 5 to 85% (non-condensing)
  • Storage temperature range: -20 to 60°C
  • Storage relative humidity range: 5 to 85% (non-condensing)
  • Ingress protection: IP20
  • Power requirements
  • Input Voltage: 4.5 to 26VDC
  • Input Current: 7mA@5VDC
  • Temperature measurements
  • Accuracy (min): ±0.13°C (in +20 to +60°C range)
  • Accuracy (max): ±0.25°C (in -20 to +60°C range)
  • Resolution: 0.1°C
  • Interface
  • Number of bus transceivers: up to 32
  • Response time ≤ 50ms
  • Master response time-out ≥ Response time + Answer time.
  • The answer time depends on the number of bits and the baud rate.
  • Warranty
  • Warranty period: 3 years