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5. The reading stabilizes af ter 30 to 60 seconds of exposure to the test gas. This
response time may increase due to the presence of the Dust Guard, Splash Guard or
other sensor accessories.
6. If the sensor does see the gas, the read-out on the display flashes for as long as t he
unit remains in the Calibration Check mode.
7. The operator should compare the reading with the gas concentrat i on applied and
determine if it is necessary to calibrate the sensor.
8. Remove the gas and expose the sensor to clean air. If the gas is not removed wit hin
6 minutes, the channel reverts to a f ault condition.
9. Press the Mode button. Calibration level is displayed f or a short time, and the
channel exits out of Calibration Check mode.
NOTE: Low and High alarms are disabled during Calibration Check mode.
3.6 Calibration Mode
NOTE: For better results power up the sensor at least an hour before the calibration.
To calibrate the Model 610A:
1. Make sure the calibration gas is the same concentration as the user specif ied
calibration level.
2. Make sure the sensor is seeing clean air.
3. Enter Calibration mode by following the same procedure f or ent ering Calibrat ion
Check mode (see 3.5). Continue to press and hold the Mode button until the CAL
LED becomes steady, approximately fifteen seconds. When the CAL LED is steady,
release the Mode button. The display shows flashing bars (--) for approximately 30 to
90 seconds. When the display changes f rom (--) to AC, clean air calibration is
complete. The channel t is now being calibrated at clean air.
4. When the channel displays AC, apply gas to the sensor. Watch the displ ay change
f rom AC to CP as the sensor detects gas. If the display does not change from AC to
CP af ter six minutes, the channel returns to normal operation.
5. When the calibration routine is complete the display changes from CP to CC. If the
display indicates F2 (f ailure to calibrate), remove the gas, wait 5 minutes then
recalibrate.
6. Remove the gas and watch the display return to normal operation.
7. Repeat the previous steps (1-6) for the other channels.
NOTE: Low and High alarms are disabled during Calibration mode.
3.6.1 Aborting Calibration
Calibration can be aborted before the calibration gas has been applied.
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