Martel Electronics BetaGauge 3II - Manual (Page 42)

3-7 Basic Operations
Zeroing Pressure Modules
The BetaGauge II has two different zeroing procedures
for pressure modules, depending on the zero reference
type installed. The two zero reference types include:
 Gauge zero. The gauge zero reference type
modules have range labels with markings of PSIG,
“H
2
0, or PSID.
 Absolute zero. The absolute zero reference
modules have range labels with the marking of
PSIA.
CAUTION: On initial power-up, if the pressure
displayed by the module while vented to
atmosphere exceeds the reference
pressure by 1% of the module’s full scale
pressure range, then the module’s
performance should be verified against a
pressure reference of equal or better
accuracy prior to use in the field.
Zeroing a Gauge Zero Reference Module
Use the following procedure to zero a gauge zero
reference module:
1. Install the module in either module bay of the
BetaGauge II.
2. Ensure that the BetaGauge II is on.
3. Ensure that the module is vented to the atmosphere.
(In other words, ensure that the module’s sensor is
exposed to the atmosphere by either disconnecting
any tubing, or opening the pressure system to the
atmosphere.)