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SIGNALPOINT PRO OPERATING MANUAL
8.3 Calibration
It is recommended to bump test the sensors frequently to ensure
There are different procedures for calibrating the toxic and Oxygen versions of the
Signalpoint Pro gas detector. For the toxic version see section 8.3.1. For the Oxygen
version see section 8.3.2.
8.3.1 Zeroing and span calibration of the toxic version detector
Caution: Before initial calibration allow the detector to stabilize for 30
minutes after applying power. When in zeroing and span calibration mode
the current output from the detector is inhibited at 4mA to avoid false
alarms. Certain gasses (such as SO
regulators and other components used for calibration to ensure
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.
To calibrate the toxic detector follow the procedure below:
1. Apply zero air to the sensor using the flow calibration housing if the area where
the detector is located contains any residual amount of the target gas. If no
residual gas is present then the background air can be used to perform the
zero calibration.
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' and the calibration level.
4. The display will then indicate 'ZEr XXX' (where 'XXX' is the length of time
30 seconds to 4 minutes dependent on gas type) 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. The display alternates between "APP GAS" and the gas reading to indicate that
the unit is expecting gas to be applied to the sensor.
7. If using the zero-air, turn it off. Zeroing is complete and saved. If span
calibration is required, proceed to the next step. Otherwise, wait until the unit
automatically returns to the normal monitoring mode.
8. Connect the regulator to the span gas cylinder.
9. Apply the span gas to the detector using the calibration flow housing.
WARNINGS
proper operation
) may require preconditioning of tubing,
2
accurate calibration.
17
MAN0853 Issue 3 10/08
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