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SRT-77 Process Meter with Thermoresistance and Thermocouple Displays

The SRT-77 is designed for accurate temperature monitoring, supporting both thermoresistance (Pt100/500/1000) and various thermocouple (K, S, J, T, N, R, B, E) inputs. It provides linearised measurements and a specialised (-10…90 mV) range for thermocouples. Features include a dual-row display for values and limits and 1 or 2 relay (or OC) outputs for process control. It integrates easily with systems via RS-485 and can be configured with a local keyboard or S-Config software. The SRT-77 simplifies temperature measurement tasks.

SRT 77 Process Meter Product Parameters

  • Output Signal: Optional 0, 1, or 2x REL or OC outputs.
  • Accuracy: 0.1% @25°C ± one digit.
  • Electrical Connections: Power supply 19V ÷ 50V DC, 16V ÷ 35V AC, 85 ÷ 260V AC/DC.
  • Process Connections: Inputs for thermoresistance Pt100, Pt500, Pt1000, and various thermocouples.
  • Media Compatibility: Operating temp. 0°C to +50°C, storage temp. -10°C to +70°C.
  • Special Features: Dual LED display, adjustable brightness, RS-485 interface, IP 65/20 protection, panel mounting.


Product Highlights

The SRT77 Process Meter is a versatile temperature meter designed for precise measurements in various industrial applications. It offers a single input for thermoresistance (Pt100/500/1000) or thermocouple (K, S, J, T, N, R, B, E) sensors. The meter incorporates polynomial characteristics for linearising the measurement data, ensuring accurate and reliable results. Additionally, for diagnostic purposes, the device equipped with a thermocouple input features an extended measurement range of -10 ÷ 90 mV. One of the key advantages of this meter is its dual-row display, where the first row presents the measured value, and the second row showcases the programmed values, such as maximum and minimum thresholds. With one or two relay (or OC) outputs, the SRT77 enables efficient control of heating or cooling processes. It supports data transmission through the RS-485 interface, facilitating integration into production process monitoring systems. The meter’s REL/OC control outputs allow adjustment of the measured signal level based on one or two threshold values. Configuration of the meter can be done through the local keyboard or the S-Config software, utilising the RS-485 communication port for seamless setup.


  • Process meter with 2 displays
  • Inputs: thermoresistance or thermocouple
  • 0, 1 or 2 relay (or OC) outputs
  • Power supply output: 24V DC
  • RS-485 / Modbus RTU
  • Automatic recognition of 3 and 4-conductor connection (RTD inputs)
  • Automatic compensation of TC cold ends temperature
  • Free configuration software S-Config”

To download the latest datasheet click here: SRT 77

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