Martel Electronics BetaGauge 3II - Manual (Page 43)

Basic Operations 3-8
4. Ensure that the BetaGauge II is displaying the first
four Setup menu items (Trip, Unit, Damp, and
V/mA).
NOTE: Only this menu display allows for both
channel selection and ZERO key operation.
5. Press the channel select key corresponding to the
module bay where the gauge zero reference module
is installed (CH1 for the left side, or CH2 for the
right side).
6. Press the ZERO key.
7. The pressure display should now be zeroed.
NOTE: The pressure display may drift slightly
from zero in the first few minutes after initial
power up. If so, press the ZERO key again while
the appropriate channel is still selected.
Zeroing an Absolute Zero Reference Module
Use the following procedure to zero an absolute zero
reference module:
1. Install the module in either module bay (channel)
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.)