5. Commissioning and operation
5.5 Settings
5.5.1
Zero point setting
The zero point setting may only be performed in SF₆ gas-free
atmospheres.
1. Wait 10 minutes for the internal warm-up phase and temperature stabilisation.
2. Press the On/Off switch (1) on the console twice briefly.
⇒
Display of the hand-held shows "Zero OK" and the display of the console
shows "Zero ADJ OK".
⇒
The gas presence detector is ready for use again.
3. For highest accuracy of the gas presence detector, repeat the zero point setting
regularly.
To remind the operator of the zero point setting, the message "Zero ?" appears on the
hand-held display and "Zero Adjustment ?" on the console display every 30 minutes.
The messages disappear after the zero point setting has been carried out.
The initial zero point setting is no longer valid at extreme outdoor
temperatures (approx. ≤ 10 °C and ≥ 40 °C [≤ 50 °F and ≥ 104 °F]). Repeat
the zero point setting if the sensor displays an SF₆ gas content in an area that
is definitely free from SF₆ gas or a CO₂ content in an area that is definitely free
from CO₂.
Additionally for CO₂ version
Following the zero point setting, the instrument indicates an CO₂
concentration of 0 ppm
air (Clean Air) is detected. For an optimal measuring result, the zero point
setting must be carried out in normal ambient air that has not been affected
by CO₂-free air.
WIKA operating instructions gas presence detector, model GIR-10
. This value drops to negative as soon as CO₂-free
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