Instruction Manual KAL 100/200
17
Zeroadjust
6
Zeroing
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. Zeroing is the process by
which the instrument automatically registers this shift and figures it into the currently displayed
pressure value. The instrument always zeroes itself after it is switched on. If automatic zeroing
has been activated, it will zero itself again after 6 min. and then every 30 min.
Zeroing switches the internal valves, which necessarily involves a loss in pressure. If this
interferes with instrument operation, the automatic zeroing feature can be switched off.
Automatic zeroing is always suppressed when the instrument is in test mode.
Display when zeroing:
6.1
Manual zeroing
Pressing and holding the ‘pressure’, ‘target value’ or ‘test’ keys will cause the instrument to zero
itself regardless of the menu setting.
7
Overpressure protection
The KAL 200 has an internal overpressure safeguard that protects the precision pressure
measurement capsule from damage. Nevertheless, great caution should be taken when
connecting the instrument to an unknown pressure source.
