WIKA data sheet SP 60.09 Applications ■ Permanent monitoring of the relevant gas condition parameters in closed tanks ■ For internal and external SF6-insulated equipment ■ High-accuracy sensor technology ■ Modbus® output protocol via RS-485 interface ■ Very good long-term stability and EMC characteristics The model GDT-20 transmitter is a multi-sensor system with digital output for the measurands 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. Changes in pressure resulting from thermal effects will be compensated by this and will not affect the output value. 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 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. WIKA data sheet SP 60.09 • 03/2021 ^ Part of your business

WIKA data sheet SP 60.09

Operating conditions Approvals Logo Logo Description China RoHS directive WIKA data sheet SP 60.09 • 03/2021

AccessoriesDesignation Order number Modbus® startup kit for 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 on USB stick Model / Permissible ambient temperature / Accessories © 08/2013 WIKA Alexander Wiegand SE & Co. KG, all rights reserved. The specifications given in this document represent the state of engineering at the time of publishing. We reserve the right to make modifications to the specifications and materials. WIKA data sheet SP 60.09 • 03/2021 iWIKAll WIKA Alexander Wiegand...