Concoa 5803007, Инструкция по установке и эксплуатации, Страница: 47 / 60

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..Set Sensor Span..
O2 20.9%
…Sensor adjustment..
O2 20.9%
Press ENTER to accept this value. The digital display will revert to Set Sensor
Span.
Press the joystick to the left to revert to the Sensor Adjustment menu.
6.2.1 Sensor Verification to Nitrogen
CONCOA recommends challenging the O
2
monitor with nitrogen every 6 to 12 months.
The sensor protector has a ¼” male tube fitting designed for connecting sample tubing
from a nitrogen cylinder. Expose the O
2
cell to N
2
at a flow rate of 500 cc/min. The
reading will drop off to 1% or below in less than one minute when the O
2
sensor is
exposed to pure N
2
. The system will recover to 20.9% when the nitrogen is removed.
NOTE: The Sensor Protector has four air relief holes that will prevent the
complete exposure of nitrogen to the Oxygen sensor. To see a true zero oxygen
level, the entire Dual O2/CO2 monitor needs be completely immersed into a zero
oxygen environment. Covering the holes will help to prevent dilution of the span
gas to ambient air.
6.2.2 Sensor Verification to a known concentration of oxygen
When testing the O
2
monitor to a known concentration of oxygen, the sensor inlet has a
¼” compression tube fitting designed for connecting the dust filter. You can connect ¼”
OD sample tubing from a nitrogen cylinder directly to the dust filter. Expose the O
2
cell
directly from the nitrogen cylinder at a flow rate of 500 cc/min. The reading will drop off
to the span gas concentration in less than 1 minute. The final reading should be within
±0.3% of the span gas concentration.
To see the exact span gas concentration the
entire Dual O2/CO2 monitor needs to be completely immersed into the span gas
environment.
093
O2 20.9%