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SIGNALPOINT PRO OPERATING MANUAL
10. The gas reading will begin to rise. When 50% of the calibration gas level is
reached, a countdown to zero (length of time 30 secs to 4 minutes dependant
on gas type) will commence and appear on the left side of the display while the
current gas reading will be indicated on the right. If 50% of the expected
concentration is not reached 'Cal Err' is displayed and the detector returns to
normal operating mode.
11. After the countdown reaches '0', if the span is successful the instrument will
briefly display 'PURGE' then 'GAS' and then indicate the current gas level.
12. The display alternates between "Pur GAS" and the gas reading to indicate that
the unit is expecting gas to be removed from the sensor.
13. Promptly switch off the calibration span gas and remove the calibration cap
from the detector to allow the gas to disperse.
14. When the instrument reads below 50% of the calibration gas level, it displays
'Pur' on the left for purging and indicates a countdown on the right (30 seconds
to 4 minutes dependant on gas type). During this time, it continues to output a
4mA inhibit signal to the controller to help prevent false alarms.
15. When the countdown is finished, the calibration procedure is complete.
Then, the instrument returns to the normal operating mode.
8.3.2 Calibrating the Oxygen version detector
Caution: When in zeroing and span calibration mode the current output from
the detector is inhibited at 17.38mA to avoid false alarms.
To calibrate the detector, use an appropriate span gas cylinder, zero air cylinder (if
required), 300-375mL/min flow regulator, tubing, activation magnet and calibration
flow housing. Contact your Honeywell Analytics representative for details of suitable
calibration kits.
Zeroing of the Oxygen version detector does not require user to apply gas. Normally
the span can be set using background air which contains 20.9%VOL Oxygen. If for
any reason background air cannot be used then span the detector using a zero air
cylinder, 300-375mL/min flow regulator, tubing, and calibration flow housing. Contact
your Honeywell Analytics representative for details of suitable calibration kits.
To calibrate the Oxygen detector follow the procedure below:
1. If necessary apply zero air to the sensor using the flow calibration housing.
2. To access the calibration mode, swipe the end of the activation magnet once
over the oval mark located at the bottom center of the detector front label until
the display indicates 'tESt'. This will be displayed for 15 seconds. Do not
swipe the magnet during this time. If there is no new magnet swipe by the
end of the "tESt" display, the instrument will automatically proceed to the
calibration mode.
3. The display will indicate 'CAL 20.9'. 20.9 is the span calibration level and is
fixed for Oxygen detectors.
4. The display will then indicate 'ZEr 45' and commence counting down to '0'.
5. When '0' is reached, if the zero is successful the display will show 'APPLY'
then 'GAS'. If not successful 'ZEr Err' is displayed and the detector returns to
normal operating mode.
6. After successful zero the display automatically switches to span calibration
and shows a 45 second count down on the left of the display and the current
detector reading on the right of the display.
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MAN0853 Issue 3 10/08
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