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5.5.1 Zeroing with Absolute Pressure Modules (APM S, H and Mk.II)
To zero, adjust the calibrator to read a known pressure, such as barometric pressure.
To adjust the calibrator, follow the principle of navigating through the functions described
in the guidelines in section 4.2 and proceed as follows
:
1. Select either the upper or lower display to work from.
2. Select “Pressure” from the Upper or Lower Mode list.
3. Press to activate the Zeroing.
4. The calibrator stores the Barometric zero offset in non-volatile memory.
The zero offset is stored for one absolute pressure module at a time. If a new
absolute module is connected this process must be repeated.
5.5.2 Using the BARO Module (optional)
1. The BARO barometer option in the ASC-400 calibrator has 2 functions.
Working as a high accuracy barometer
Applying the barometric pressure value to the measurement of a pressure
module (APM) allowing any gauge APM to be used for absolute measurements.
This system is superior to ordinary absolute sensors, as the working sensor is
gauge and can be zeroed at any time, compensating for potential drift.
Figure 6
Connections for Measuring
Pressure
ZERO
APM pressure module