WIKA data sheet SP 60.14 Applications ■ Permanent monitoring of the relevant gas condition parameters in closed tanks ■ For internal and external SF6-insulated and alternative gas-insulated equipment ■ High-accuracy sensor technology ■ Modbus® output protocol via RS-485 interface ■ Very good long-term stability and EMC characteristics The model GDHT-20 transmitter is a multi-sensor system with digital output for the measurands of pressure, temperature and humidity. Based on these measured values, the condition-related data can be determined. Permanent monitoring In order to prevent system failures in switchgear and, with that, network outages, the permanent monitoring of the gas density and moisture content is essential. The GDHT-20 transmitter calculates the current gas density from the pressure and temperature using a complex virial equation in the transmitter's powerful microprocessor. Changes in pressure resulting from thermal effects will be compensated by this and will not affect the output value. In addition, the GDHT-20 transmitter delivers humidity or dew point information, which enables monitoring within the terms of the Cigre directives and IEC standards. Modbus® fieldbus 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 GDHT-20 transmitter can be freely configured in percentage values by the user for any defined gas mixture consisting of SF6, N2, CF4, O2, CO2, 3M™ Novec™ 4710, He and Ar. The calculation of gas density is based on the partial pressure method of the individual gas components. The humidity values can be output for SF6 gas and N2. 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. WIKA data sheet SP 60.14 • 11/2021 Data sheets showing similar products and accessories: Accessories for electrical gas density instrumentation; see data sheet AC 80.27 IwikaII ^ Part of your business

WIKA data sheet SP 60.

For approvals and certificates, see website WIKA data sheet SP 60.14 • 11/2021

WIKA data sheet SP 60.14 • 11/2021

Measuring chamber, DN 20, 90° angled Measuring chamber, DN 20 male thread / DN 20 female thread Measuring chamber, DN 8 male thread / DN 8 female thread Measuring chamber, DN 8 male thread / DN 20 female thread Measuring chamber, DN 20 male thread / DN 8 female thread Measuring chamber, flange D70, female / flange D70, male WIKA data sheet SP 60.14 ∙ 11/2021

Designation Order number Modbus® startup kit for measured value recording and configuration, consisting of: 14075896 ■ Power supply unit for transmitter ■ Cable with M12 x 1 connector ■ USB cable type A to type B ■ Modbus® tool software WIKAsoft-GD for configuration and testing of the sensor Free download from: Shielded cable, M12 x 1, AWG20 Order number Length 1 m Length 2 m Length 3 m Length 4 m Length 5 m Length 6 m Length 7 m Length 8 m Length 9 m Length 10 m Length 15 m Length 20 m Length 25 m Length 30 m Ordering information Model / Permissible ambient temperature / Process connection /...