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ANNED Products: SF6 Components

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Contact Devices

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

ANNED 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, ANNED 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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Movements

Material used with high quality chromium nickel steel measuring systems including Germany-locally-made SS 316 movements, Bourdon tubes, and stems to achieve a measuring system seal from 1*10 [mbar l/s] in the long term.

 

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Bourdon Tubes

Germany-locally-made SS 316 Bourdon tubes to ensure the high quality chromium nickel steel measuring systems maintain their high service level.

 

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Cable Junction Boxes

Designed for use with SF6 gas density monitors, the extra safety cable junction box meets the high standard for SF6 electrical connections.  Detailed specs of the Cable Junction Box are:

  • 6 poles
    - possibility to connect an additional earth terminal
  • protection according to IEC 529 IP 65 (when screwed)
  • angular shape, turnable by 180°
  • nominal voltage 250 V
  • air and creep distances according to VDE 0119, insulation group C
  • permanent current 16 A max.
  • contact material brass nickel-plated
  • type of connection
    - terminal space:
      screw terminal up to 2.5 mm²
          with a wire protection
    -     at the side of the apparatus:
          soldered connection up to 2.0 mm²
  • cable gland PG 13.5
  • exterior cable diameter 7-13 mm
  • traction-relief
  • ambient temperature -40 °C...85 °C
  • material polyamide 6
  • suitable for all liquid filled apparatus

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SS316 Ti Stem

SS 316 stem to ensure the high quality chromium nickel steel measuring systems maintain their high service level.