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SECTION II
Operating Principle
The operation of Hastings vacuum gauges uses a patented noble metal thermopile circuit. The
hot junctions of the thermopile are heated directly by an AC current while an equal number of
cold junctions are kept at ambient temperature by heavy mounting studs. Thus a DC voltage is
then generated between the hot and cold junctions. As the pressure decreases, the lowering of
the thermal conductivity of the gas surrounding the hot junction tends to increase the tempera-
ture of the hot junctions, thus increasing the output of the thermopile. This change in output is
then amplified, linearized, and calibrated as a function of pressure.
1.0 SPECIFICATIONS
Indicator Model ....................................................................................................DNV-33D
Case Dimension .......................................................Front Panel 96mm SQ. Depth 10 ¾”
Gauge Tube Type ....................................................... DV-33D-1, DV-33D-2, DV-33D-3*
Gauge Tube Shell ......................................................................Welded stainless steel shell
Overpressure .............................................................................................1500 PSIG max.
Panel Cut-out ................................................ 3-1/16” (77.5 mm) H x 3-5/8” (92mm)W
Range .............................................................................................................. 1-1000 mTorr
Readout ........................................................................................................... Digital Meter
Power ....................................................................................... 115 VAC, less than 6 watts
Outputs ................................................................. Linear 0-1 VDC analog @ 4 ma. Max.
Calibration .............................................................................. Calibrated for air or nitrogen
*Dash number Defines System Fitting Differences:
-1 Weld Fitting
-2 Cajon #SS-4 VCR Male Gland
-3 Cajon #SS-4 VCR Female Gland