Threshold values are usually controlled with magnetic snap action contacts or microswitches.  Density monitors with supplementary electrical equipment are subject to individual testing.  Density limits below the filling pressure (e.g. alarm, emergency off) are controlled by contacts designed to make on declining density.  In the case of increasing density, the threshold value (e.g. filling pressure reached signal) takes the form of a contact which makes when filling pressure is exceed.  These contacts are adjusted and fixed at the factory to meet customer requirements.  Detailed specs of the Contact Devices are:

• Normal Operating Voltage: 250 V max.
• Making and Breaking Current: 1.0 A max.
• Permanent Current: 0.6 A max.
• Switching Capacity: 30W/50VA max.
• Contact Material: Ag80 Ni20
• Switching Accuracy: ±2.5%
• Ambient Temperature: -40°C...70°C
• Types of Contact:
  - Single, Double, and Triple Contacts
  - Double Contacts, 2 Separate Circuits
  - Triple Contacts, 2 Separate Circuits

ENERGIE uses the Contact Device which is identical to the Contact Device that WIKA uses on their SF6 gas density monitors.

Gas Density Monitors with Local Indicator and Alarm Contacts
Gas density monitors with local indicator and alarm contacts combine the indicator and switching function.  Each gas density monitor is adjusted individually to its calibration pressure.  In order to define the bimetal compensation exactly, ENERGIE uses a computer-controlled adjustment equipment to make the job precisely.  Apart from considering the calibration pressure, this equipment also takes into account different factors influencing the instrument.  For example, the Bourdon tube and the characteristic data of the bimetal used for temperature compensation.  The class accuracy is ±2.5% within the temperature range -40°C...60°C.  The switching accuracy is ±2.5%.  The information concerning the switching accuracy refers to the calibration pressure.  For further information, please refer to the e-catalog, which can be downloaded at SF6 Home.

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