92 • Calibrating Using the Single Calibration Method
EAGLE 2 Operator’s Manual
8. If necessary, adjust the calibration gas value to match the cylinder concentration using
the AIR
▲
YES and RANGE
▼
SHIFT buttons. For this example, the calibration gas
value is entered as 50 %LEL.
NOTE:
The calibration gas value cannot be set lower than the low alarm setting. If the
calibration gas value listed on the calibration cylinder is lower than the current
low alarm setting, enter Setup Mode and change the low alarm setting. See
“Updating the Alarm Point Settings” on page 106 for instructions. If you need
to change the alarm point setting only to perform a calibration, make sure that
you change the alarm point setting back to its original value once the calibration
has been performed.
9. Press and release the POWER ENTER RESET button to proceed to the Single
Calibration Apply Gas Screen.
CAL IN PROCESS
is flashing.
10. Fill the gas collection bag by screwing the fixed flow regulator or dispensing valve
onto the calibration cylinder and turning the knob counterclockwise.
11. Allow the gas to dispense until the gas collection bag is a little over half full.
12. Turn the knob clockwise to stop the gas flow, clamp down the hose clamp and remove
the regulator or dispensing valve from the cylinder.
13. Disconnect the tubing from the regulator or dispensing valve.
14. Open the hose clamp on the gas bag tubing.
15. Connect the tubing from the gas bag to the rigid tube on the probe. Allow the gas to
flow for one minute.
NOTE:
If you are calibrating the catalytic combustible channel with a gas concentration
of 1000 ppm or lower, you must use a 24 inch humidifier tube to connect the
gas bag to the rigid tube on the probe.
16. Press and release the POWER ENTER RESET button to make the span adjustment.
17. When the span adjustment is made, the EAGLE 2 calculates the range of adjustment,
minimum and maximum, it could have made based on its response level to the
applied gas. This calculated range is independent of the calibration gas value that was
entered in Step 8 and Step 9 above. The adjustment range is included on the result
screen to indicate the condition of the sensor. If the calibration gas value is in the
adjustment range, the span adjustment will pass. If the calibration gas value is out of
the adjustment range, the span adjustment will fail.
SINGLE CALIBRATION
APPLY GAS
CH4 0 %LEL
CAL IN PROCESS
ENTER WHEN DONE
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