Arun Microelectronics PVU3 User Instructions

Models:-
PVU3. Non Bakeable Pirani Gauge
PVB3. Bakeable Pirani Gauge Model
USER INSTRUCTIONS Issue 1.2
Model PVU3 is a general-purpose constant voltage Pirani gaugehead. Model PVB3 is a 200C bakeable,
constant voltage Pirani gaugehead. They are designed for use with AML NGC and PGC series of
Pressure Gauge Controllers.

INSTALLATION.

For best results and maximum operating life the gaugehead should be mounted as close to vertical as
possible, with the mounting flange at the bottom. Gauge heads can be mounted in any orientation, but
there may be a risk of particle contamination, filament sag and unusual convection effects. Choose a
position that is shielded from sources of heat.
If using a PVB3 gaugehead, the DIN connector must be outside the bakeout zone. If the integral leads
are not long enough they may be extended by 10 metres with an AML model PVX10 extension cable.
Using the PVX10 extension cable will not affect the gauge calibration.

OPERATION.

Refer to the control unit operating instructions for details of gauge connection.
AML gauges are pre-calibrated for Nitrogen but Pirani gauge calibration is sensitive to the gas species
being measured.
Some relative sensitivities are given below.
True Pressure = Indicated Pressure/Relative Sensitivity
Gas Species
Air
Argon
Carbon Dioxide
Carbon Monoxide
Helium
Hydrogen
Methane
Neon
Nitrogen
Sulphur Dioxide
Water Vapour
Xenon
Relative Sensitivity to Nitrogen
1.0
0.66
1.1
1.0
1.0
1.3
1.64
0.9
1.0
1.0
1.5
0.35
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