RKI Instruments 12 VDC Beacon 200 - Manual (Page 47)

12 VDC Beacon 200 Operator’s Manual • 43
3. If the detector is in a fresh air environment, press the ENTER button.
The unit will adjust the zero reading and display the message Fresh
Air Adjust Passed for: Channel 2 before continuing.
If you suspect the detector area is not a fresh air environment, apply
zero air to the detector before pressing the ENTER button. See the
detector head instruction manual for instructions to apply zero air to the
detector. The 12 VDC Beacon 200 will freeze the display reading for
channel 2 at the lowest level reached while applying zero air (highest
level for an oxygen channel). After applying zero air for the required
amount of time, usually two minutes, remove the zero air source from
the detector. Press the ENTER button at the 12 VDC Beacon 200.
The unit will adjust the zero reading and display the message Fresh
Air Adjust Passed for: Channel 2 before continuing.
4. The display asks if you want to perform a span (zero for an oxygen
channel) operation on channel 2 by applying gas. Press the UP/YES
button to continue with adjusting the span on channel 2.
If you press the DOWN/NO button, the unit will return to the first
calibration program screen which asks if you want to continue or
escape from the Calibration Program.
5. If you pressed the UP/YES button, the display will prompt you for the
span gas (zero gas for an oxygen channel) concentration that will be
used. Adjust the displayed concentration up or down as needed using
the UP/YES and DOWN/NO buttons so that it matches the
concentration in the calibration cylinder.
6. Press the ENTER button to accept the calibration gas concentration
and continue. The unit will display the message Expose Dectector(s)
To Gas. . . When Done Press ENTER for a few seconds. It will
then alternate between the gas reading for channel 2 and the message
APPLYING GAS ENTER to ACCEPT ESCAPE to ABORT above
the time remaining in the calibration time-out.
7. Apply the calibration gas to the detector. See the detector head
instruction manual for instructions on how to apply gas to the detector.
When the calibration gas is applied, the 12 VDC Beacon 200 will
freeze the display gas reading at the highest level reached while the
gas was applied (lowest for an oxygen channel).
8. After applying calibration gas for the required amount of time, usually
two minutes, remove the gas from the detector.