Model GDM 233.52.100 TA

Gas Density Monitor

With Attached Gas Density Transmitter

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Applications

  • Gas density monitoring of closed SF6 tanks
  • For indoor and outdoor installation in SF6-gas-isolated switching units

Special Features

Modified bourdon tube pressure gauge with Gas Density Transmitter attached to the outside connection of the case

  • Local readout with alarm contacts
  • Remote readout (output 4 … 20 mA, 2-wire system), measuring ranges from 0 ... 10 g/liter to 0 ... 80 g/liter
  • High EMI performance, CE-conformity
  • Hermetically sealed, therefore no influence by atmospheric pressure fluctuation and differences in altitude

Description - Gas Density Transmitter

Model 233.52.100 TA features a Gas Density Transmitter attached to the side of the Gas Density Monitor's pressure connection. It functions fully as a standard GD-10 Gas Density Transmitter, however, the combination allows for both instruments to obtain a density reading through a single connection to the tank. WIKA transmitter GD-10 L (with L-plug connection) is shown in the drawing below, however GD-10 C (with attached cable) or GD-10 F (with robust field case) can also be used.

The gas density transmitter is electrically compensated following the non-linear behavior of SF6-gas according to the virial equation. This provides the highest accuracy and best temperature compensation possible since SF6 is a real gas functioning according to real gas law equations. Only a gas density transmitter can take this into account.

The gas density transmitter picks up the pressure and temperature of the SF6-gas contained in the tank.

The current gas density is ascertained from both variables by means of an electronic evaluation system. Thermal induced pressure changes are dynamically compensated and do not affect the output signal.

The gas density transmitter generates a density proportional standardized signal of 4 ... 20 mA (2-wire system) and measures ranges from 0 ... 10 g/liter to 0 ... 80 g/liter.

Recalibration of the zero signal is not necessary due to the high long-term stability of the gas density transmitter. The hermetically-sealed measuring cell guarantees high long-term leak tightness. It is welded closed to prevent leaks and remain independent of atmospheric pressure fluctuations and variations of the mounting height.

The EMI properties of the transmitter are tested according to IEC 61000-4-2 thru IEC 61000-4-6 and guarantee a safe pick-up of the signal which is especially suited to conditions prevailing in high-voltage switching units.

Gas Density Monitor
  • Gas Density Monitor
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