Hybrid gas density monitor with reference chamber
With Modbus® interface or analogue 4 ... 20 mA signal
Applications
- High-voltage switchgear
- 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 a digital signal
- The 4 ... 20 mA version outputs the absolute pressure at 20 °C [68 °F] or the gas density in g/l as an analogue signal
- Suitable for SF<sub>6</sub> and alternative insulating gases
- Complete on-site indication of the density and vacuum range on a 100 mm [3.94 in] dial
Description
Gas density is a crucial operating parameter for high-voltage switchgear. 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 sensing technology and evaluation electronics are incorporated.
Via the on-site indication, 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 or attached Modbus® interface or 4 ... 20 mA sensing technology enable remote monitoring of the plant.
In the digital version, 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 insulating gases consisting of N2, CF4, O2, CO2, C4-FN, 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
