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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
pirani gauge •Features and application • Low-cost design by unified sensor and control circuit • Wide range measurement covering from atmospheric pressure to 5x10 Pa • High-accuracy with significant improvement in temperature correction due to adoption of digital circuit • Light-weight and compact due to digital circuit and unique filament structure • Output of 0 to10 VDC in proportion to pressure can be converted to pressure by means of log-linear equation • Best suitable for automation with standard installation of RS-485 digital communication • Transducer TRP-10: driven by 12 to 30 VDC power, power-indicator TR- 1DA and TR-1DB: driven by 100 to 240 VAC power • Best suitable for low vacuum measurement of various vacuum systems • Best suitable for pressure monitoring of various processes • Optional TRP-10SP: equipped with 2 set-points a
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.
Analog penning gauge DHVE This is 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. This cold cathode ionisation gauge works on the principle of cold cathode discharge and ionisation. It is has an anode and a cathode electrode. An electrical potential of approx. 2.2kV is applied between anode and cathode. The electron emission will happen from the cathode (gauge head boby). Here a magnetic is assembled and the magnetic field is introduced. Due to which the ionization current is increased. Since the magnetic field is applied at right angle with the electrodes, the emitted electrons will take a helical path before reaching the anode. 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 ionization increases rapidly. This cold cathode penning gauge, with this principle of measurement of vacuum, it is designed to read from 10-2 to 10-6 m.bar. The high efficiency high voltage DC power supply, rugged electronics design high quality permanent magnets are part of the penning gauge. The ionization current is read from the front panel micro ammeter. Salient Features: • rugged and stabilised DC power supply for accurate reading • Easy maintenance of the sensor • Rugged design for no filament burnout • Instant start up • Standardised to heat and voltage fluctuations • Compatible out put for process set point controller
DHVEPirani gauge, digital versions with sensor have wide range of applications in high vacuum systems. The measuring range of DHVE Pirani gauge is up to 10-3mbar. Within limits, decreasing pressure causes decrease in particle density, increase in their mean free path and lowering of the thermal conductivity of the medium. Pirani gauge head and gauge use this principle for system pressure measurement. The gauge consists of the stabilized power supply and the indicating meter with the arrangement to select any two gauge head consists of the bridge and calibration elements. These heads are factory calibrated with full interchangeability in filed Applications ?Laboratories ?Optical and thin film coating industries ?Chemical and Pharmaceutical industries ?Semiconductor industries ?Vacuum metallurgy and many more… Features ?Engineered for total reliability ?Totally indigenous ?Compact solid state electronics ?Wide angle meter for unambiguous indication ?Two gauge head drive capability ?Minimum controls ?No user calibration ?Modular hardware ?Ideal for roughing, fore-line pressure monitoring ?Compatible output for process set point controller
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