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Unique Vacuum Systems, Bangalore India, Supplier of Vacuum Pumps, Measuring instruments, Helium leak testing services
 
 

ANALOG PIRANI VACUUM GAUGE: model-M-90
Unique Vacuum   
Unique vacuum solutions pirani gauges have very wide range of applications where the vacuum measurement needs to be carried between 0.5 mbar to 0.001 mbar.
Working principle:
The sensor tube of the pirani gauge head consists of a high temperature co-efficient resistance filament. The filament is heated with a constant voltage supply.  The variation in pressure in vacuum line causes changes concentration of gas molecules present , in turn the variation in the thermal conductivity of the gas.
Hence the heat loss of the electrically heated filament varies with respect to the pressure.
This filament is constructed as an arm of the wheat stone bridge. A slight change in system pressure brings larger change in filament resistivity resulting in an imbalance of the bridge.

this bridge imbalance current is a measure of pressure which is properly conditioned and displayed on the analog meter.
Technical specifications:

Particulars

Details

Unit of measurement

m.bar

Sensor model

 

Pressure range

0.5 to 0.001 mbar

Display

Continous single scale meter display with selector switch for GH selection.

Number of gauge heads

Standard Two
(optional single gauge head )

Power input

220V AC, 50 Hz

Operating temp.

15 to 45 deg C

Analog output

0 to 200mV DC

Calibration

Factory set

Gauge head mounting

Orbitary (preferably vertical)

Gauge head cable

Standard 2 mtrs, extra length on request

Dimentions

179mm X 98mm X 98mm

Cut out size

92 mm X 92 mm

End connection of gauge head

KF-10

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