Hybrid Gas Density Monitor 879X – Hybrid Gas Density Monitor

Mechanical and electronic monitoring

Features

  • Exact switching following isochore at all temperatures
  • No contact bouncing
  • Independent, galvanically separated circuits
  • Output signal RS485 / MODBUS
  • Long term drift free output signal
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Technical Data

Applications

High voltage switchgear

Category

Hybrid gas density monitors

Dielectric strength

Microswitch: 2 kV terminal ground
Output signal sensor: 250V against mass (EN60255-5)

Measuring principle

Mechanical monitoring: Principle: Reference gas measurement
Electronic monitoring: Principle: Oscillating quartz measurement

Approval / conformity

GL, KRS

Vibration

At min. 5 kPa distance from switch point no contact bouncing
under 20...100 Hz: 4 g

Pressure connections

Open; Closed; G1/4" m

Media temperature

-40°C ... 80°C

Shock

50g/ 8 ms

Electrical connections

Cable PUR/Teflon/PE

Ambient temperature

-40°C ... 80°C

Type of protection


II 1G Ex ia IIC T3 ... T6
II 1D Ex ia IIIC IP6x T125°C ... T80°C
I M1 Ex ia I

Protection

IP67

Output signal

RS485 / MODBUS

Measuring range

Mechanical monitoring, measuring range absolute: 0...1.1 MPa (0...1100 kPa)
Electronic monitoring/sensor, measuring range absolute: 0...0.85MPa SF6 @ 20°C 0...56.1 kg SF6 /m3

Sensor

1.4435, 1.4404, 1.4571 (AISI316L, AISI316)

Hybrid Gas Density Monitor 879X - Hybrid Gas Density Monitor