Model GDT-20

Transmitter for gas density, temperature and pressure of SF6 gas

With Modbus® output

Selected documents
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  • Permanent monitoring of the relevant gas condition parameters in closed tanks
  • For indoor and outdoor SF6 gas-insulated equipment

Special Features

  • High-accuracy sensor technology
  • Modbus® output protocol via RS-485 interface
  • Ingress protection IP65
  • Very good long-term stability and EMC characteristics
  • Compact dimensions


The model GDT-20 transmitter is a multi-sensor system with digital output for the measurement parameters of pressure and temperature. Based on these measured values, the condition-related data can be determined.

Permanent monitoring
In order to prevent system failures in switchgear and network outages, the permanent monitoring of the gas density is essential.

The GDT-20 transmitter calculates the current gas density from the pressure and temperature using a complex virial equation in the transmitter's powerful microprocessor. Pressure changes resulting from thermal effects will be compensated by this and will not affect the output value.

Modbus® field bus
The RS-485 interface communicates using the Modbus® RTU protocol. The instrument's output parameters and their units can be configured and read according to requirements. The GDT-20 can be configured later by the customer for each defined SF6 gas mixture with N2 or CF4.

Signal stability
Due to its high long-term stability, the transmitter is maintenance-free and requires no recalibration. Due to the hermetically sealed weld seam and a measuring cell design without sealing elements, the permanent sealing of the measuring cell is ensured.

The EMC characteristics fulfil the IEC 61000-4-2 through to IEC 61000-4-6 standards and guarantee an interference-free data output.

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