halstrup-walcher P29, Оригинальное руководство пользователя, Страница: 15 / 32

P29 Instruction Manual
15
Zero-point calibration cycle
External influences such as temperature, position or ambient pressure can shift the
instrument’s zero point, i.e., the value displayed when the pressure ports are open. During
calibration, the instrument automatically calculates this shift and takes it into account during
the zero-point calibration. The zero-point calibration takes place in two steps, which are shown
in the top line of the display (optional).
“
 0” Measuring signal of the zero point is being determined.
“  P” Pressure is being reconfigured
The interval between two zero-point calibrations can be adjusted in the Settings menu.
Zero-point calibration can also be started with the Enter key if the device is in Measurement
mode.
The P29 does not respond to keys being pressed during calibration.
5.1 External zero-point calibration
In order to trigger an external zero-point calibration, connection 4 at the output connector must
be briefly connected to +24V.
If a zero point adjustment is called up via the serial interface or the external zeroing input, it will
be carried out in any case. It is irrelevant whether the zero point adjustment has been
deactivated or the P29 is in the menu mode.
Overload capacity
The P29 has an internal overpressure safeguard that protects the precision pressure
measurement capsule from damage:

100 kPa for measurement ranges
≥ 2,5 kPa

200 x for measurement ranges < 2,5 kPa