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.