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ANALOG PIRANI VACUUM GAUGE DHVE 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.
Digital pirani gauge DHVE DHVE Vacuum Pirani Gauge Controller displays vacuum pressure as measured from a S-PR-GH sensor tube. It displays vacuum measurements based on thermal conductivity of air or nitrogen. The Model DHVE controller covers the range from 0.001bar to 999 mbar, and controls relay with independent set point. ***The optional RS232 along with analog output 0 to 10V and 4 to 20 mA facility can be obtained on request Applications • Controlling high vacuum systems • Fore vacuum pressure monitoring • Safety circuits in vacuum systems • General vacuum measurement & control in the fine and rough vacuum range. • Measurement range 0.001 to 999 mbar • Easy “ATM” and “0” adjustment on the signal conditioner PCB • Space saving rugged design- 1/8 DIN console • Mounts in any orientation • Brass body measuring cell with metal-sealed feed through • With universal power supply – input voltage from 90 ~ 264VAC, frequency 47 ~ 440Hz • Integrated set point adjustment and relay output • Easy To Read 4 Digit Backlit Display • Dual Set Point Controller With 2 Relays (select model DPRG-2GH-SP) • Change Cable Length Without Re-calibrating upt o 8 mtrs
Digital Penning Gauge - DHVE Thisis a cold cathode Ionisation gauge consisting of two electrodes anode and cathode. A potential difference of about 2.2 KV is applied between anode and cathode through current limiting resistors. A magnetic field is introduced at right angles to the plane of the electrodes by a permanent magnet having nearly 800 gauss magnetic field which will increase the ionisation current. The electrons emitted from the cathode (gauge head body) of the gauge head are deflected by means of magnetic field applied at right angles to the plane of the electrodes and are made to take helical path before reaching the anode loop. Thus following very long path, the chance of collision with gas molecule is high even at low pressures. The secondary electrons produced by ionisation themselves perform similar oscillations and the rate of ionisation increases rapidly. Eventually, the electrons are captured by the anode and equilibrium is reached when the number of electrons produced per second by ionisation is the sum of positive ion current to the cathode and the electron current to the anode and is used to measure the pressure of the gas. This instrument with the sensor having wider range of applications, in high vacuum systems where the final Vacuum to be measured in process chamber. These instruments can be used in high vacuum systems, coating units, sputtering units, vacuum furnaces and many other applications where high vacuum to be measured in the range of 10-2 to 10-6 m.bar.
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HIGH PRESSURE DIGITAL PIRANI GAUGE
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