WIKA data sheet SP 60.80 ■ Gas density monitoring of closed insulating gas compartments ■ Remote monitoring of the insulating gas condition ■ Raising an alarm when defined limit values have been reached Special features ■ Ideally suited for smart grid or modernisation projects ■ Modbus® delivers measured values for pressure, temperature and gas density as digital signal ■ The 4 ... 20 mA variant outputs the absolute pressure at 20 °C [68 °F] or the gas density in g/l as an analogue signal ■ Suitable for SF6 and alternative gases ■ Complete local display of the density and vacuum range on a 100-mm [3.94 in] dial Gas density is a crucial operating parameter for high-voltage plants. If the required gas density is not present, safe operation of the plant cannot be guaranteed. The WIKA gas density measuring instruments provide reliable warnings against dangerously low gas levels, even under extreme ambient conditions. If the gas density drops as a result of a leakage, the switch contacts will switch. In addition to the traditional gas density monitor, with the model GDM-RC-100-T high-precision sensors and evaluation electronics are incorporated. Via the on-site display, the pressure based on 20 °C [68 °F] can be read directly on the instrument. With the integrated switch contacts, simple switching tasks can be realised quickly and without complication. The integrated Modbus® interface or the 4 ... 20 mA sensors integrated or attached to the instrument enable remote monitoring of the plant. Left: Hybrid gas density monitor with integrated transmitter, model GDM-RC-100-T Right: Hybrid gas density monitor with attached transmitter, model GDM-RC-100-T The measured data for pressure, temperature and gas density are transmitted using the standardised Modbus® RTU protocol. The model GDM-RC-100-T can also be configured for alternative gases consisting of N2, CF4, O2, CO2, 3M™, Novec™ 4710, He and Ar. The analogue version of the GDM-RC-100-T uses the proven technology of the 4 ... 20 mA analogue signal and outputs the absolute pressure at 20 °C [68 °F] or the gas density in g/l for insulating gas as an analogue signal. The data storage enables trend analysis to be carried out, so that critical insulating gas conditions can be predicted and rectified in time. An optimisation of the maintenance strategy from time-based (TBM) to condition-based (CBM) is possible through the use of the GDM-RC-100-T. TBM =Time Based Maintenance CBM= Condition Based Maintenance WIKA data sheet SP 60.80 • 02/2024 Page 1 of 15 Data sheets showing similar products: Hybrid gas density monitor; model GDM-100-T; see data sheet SP 60.79

Process connection WIKA data sheet SP 60.80 • 02/2024

Material (wetted) Product label Lasered onto the reference chamber, maximum resistance to weathering Test of dielectric strength Electric strength ■ 2 kV pin on grounding (case) ■ 2 kV pin on pin (switch contact to switch contact) ■ 1 kV pin on pin within the switch contact - 1 minute WIKA data sheet SP 60.80 • 02/202

Optional calibration valve All weld seams are qualified in accordance with DIN EN ISO 15613 in combination with DIN EN ISO 15614-1 and DIN EN ISO 15614-12 by the notified body TUV Sud. Tightening torque, test connection: 40 Nm ±10 % Gas-tight: Leakage rate < 1 • 10-8 mbar • l/s Digital sensor technology, model GD-20-D Accuracy specifications Compensated pressure ranges in bar abs. at 20 °C [psi abs. at 68 °F] (g/l SF6) 0 ... 2 (12.28) [0 ... 29.00] WIKA data

1) Specifications apply to measurement of the compensated pressure over the entire temperature range from -40 .. consisting of 6 % 3M™ Novec™ 4710, 5 % O2 and 89 % CO2. +80 °C [-40 ... +176 °F], valid only for pure SFe gas and a gas mixture Analogue sensor technology, model GD-20-A Compensated pressure range in bar abs. at 20 °C [psi abs. at 68 °F] 1) Specifications apply to measurement of the compensated pressure over the entire temperature range from -40 ... +80 °C [-40 ... +176 °F], valid only for pure SFe gas. Accuracy is achieved after a max. of 60 minutes operating time. Density range in...

±0.1 % per year for the density signal Overload safety and burst pressure WIKA data sheet SP 60.80 • 02/20

Output signal Maximum permissible load RA < (UB - 9.5 V) / 0.023 A with RA in ohm and UB in V Time response WIKA data sheet SP 60.80 • 02/2024

■ Circular connector M12 x 1 metal (5-pin) ■ Circular connector M12 x 1 plastic (5-pin) WIKA data sheet SP 60.80 • 02/2024

Approvals included in the scope of delivery Logo Description China RoHS directive For approvals and certificates, see website Model GDM-RC-100-T with integrated transmitter and rear process connection G 1/2 B WIKA data sheet SP 60.80 • 02/2024

Model GDM-RC-100-T with integrated transmitter and vertical process connection G 1/2 B Model GDM-RC-100-T with attached analogue transmitter and rear process connection G 1/2 B Model GDM-RC-100-T with attached digital transmitter and vertical process connection G 1/2 B WIKA data sheet SP 60.80 ∙ 02/2024

Model GDM-RC-100-T with integrated transmitter and rear process connection DN 8 Model GDM-RC-100-T with integrated transmitter and rear process connection DN 8 and recalibration valve Model GDM-RC-100-T with attached digital transmitter and vertical process connection G 1/2 B and recalibration valve WIKA data sheet SP 60.80 ∙ 02/2024

Versions, model GDM-RC-100-T with attached analogue GD-20-A transmitter Designation WIKA data sheet SP 60.80 • 02/2024

Versions of cable glands for model GDM-RC-100-T with integrated transmitter Optional accessories Recalibration valve Model GLTC-CV Connection cable for Switching outputs ■ Enables easy recalibration of the gas density monitor without dismounting ■ Welded permanently to the instrument or available as loose valve for retrofitting Terminal without wiring Connector mounted on the instrument side, cable with loose ends WIKA data sheet SP 60.80 • 02/2024