Trafag, 8716, 8726, 8736, 8746, SF6
Principle: Reference gas measurement Exact switching following isochore Excellent vibration resistance No false alarms at low temperatures Stainless steel or aluminum sensor Galvanically separated circuits Switch point adjustment in factory Application
High voltage technology
Main characteristics
Gas Density Monitor for SF6 and other gases
? Principle: R eference gas measurement
? Measuring range absolute: 0...1.1 MPa
(0...1100 kPa)
? Output: floating change-over contact
? Switch point: factory calibrated
Main features
? Exact switching following isochore at all temperatures
? Excellent vibration resistance
? No contact bouncing
? Either stainless steel or aluminium/stainless steel probe
? Independent, galvanically separated circuits
Ordering information
Specifications
Main characteristics
Principle: R eference gas measurement
Measuring range absolute: 0...1.1 MPa(0...1100 kPa)
Output: floating change-over contact
Switch point: factory calibration
accuracy
Reference pressure < 650 kPa @ 20°C abs.:
± < 10 kPa @ -30...+50°C
Reference pressure >650 kPa abs.:
± < 12 kPa @ -30...+50°C
accuracy of indicator
SF6 Indicator dial
Accuracy of indicator within numeralised
range: ± 10 kPa @ 20°C
Low pressure indicator
Accuracy of indicator within numeralised
range:
@ 0 kPa relative: ± 20 kPa
>200 kPa relative: ± 10 %
Micro switch
Rating: see table
Resistance of insulation: > 2 MΩ
Dielectric strenght: 2 kV terminal to ground
Life time (mechanical)
micro switch 20: 1 Mio. cycles
micro switch 28: 10 Mio. cycles
max. difference from the lowest to the highest
switch point: 130kPa
Switching differential typ.
micro switch 20: < 15 kPa
micro switch 28: < 10 kPa
for indicating range or switching distance
> 80 kPa: < 15 kPa
Electrical connection
Screwed cable gland: see accessories
Screw terminal: plugable, 0.2...2.5 mm2
environmental conditions
Ambient temperature: –40...+80°C
Media temperature: –40...+80°C
Protection: IP67
Humidity: max. 95% relative
Vibration:
@ min. 5 kPa distance from switch point no contact bouncing
under 20...80 Hz: 4 g
Vibration resistance: 100 Hz, 20g, 15 min.
Shock: 50g/ 11ms
Mechanical data
Material
Measurement system
Sensor: 1.4435, 1.4404, 1.4571
(AISI316L, AISI316)
Filling: Gas
Housing (density monitor): AIS i10Mg
Screwed cable gland: brass nickel plated
Weight: ~ 800...1000 g
Pressure connection: 1.4404 (AISI 316L)
(see data sheet H72502)
Electrical data switch
Protection
Dimensions
Dimensions
