PureAire Monitoring Systems, Inc.
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P a g e
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 as
a ¼” compression tube fitting designed for connecting the sample tubing. You can
connect ¼” OD sample tubing from a cylinder filled with Zero Grade air directly to the
tube inlet and expose the O
2
cell directly. The On-Demand Regulator will permit gas to
flow at the flow rate programmed into the Sample Draw Monitor.
Expose the monitor for 1 minute and then adjust the reading to 20.9% when using Zero
Grade air. Remove the tube from the On-Demand Regulator and remove the Zero grade
air from the monitor. The final reading should be within
±
0.3% of the span gas
concentration.
NOTE:
To see a true zero, the entire Air Check
✓
O
2
monitor needs be
completely immersed into a zero-oxygen environment
.
O2 monitor
Connected to gas cylinder
