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SIGNALPOINT PRO OPERATING MANUAL
10.2 Functional gas test
It is recommended that the detector is tested frequently to ensure the system is
operating properly. Keep in mind different sensor types may require more frequent
maintenance depending on the environmental conditions and gases present.
1. Inhibit the associated control panel in accordance with local or site practice.
2. In the detector's monitoring 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.
The output current loop will transmit 4mA for toxic sensors (equivalent to
0ppm) or 17.4mA for Oxygen sensor (equivalent to 20.9%).
3. To enter the test mode, during the "tESt" display mode, swipe the magnet
once over the oval mark. It then displays "tSt " and the gas level. The
instrument will be in the test mode for 30 minutes if no magnet swipe is
sensed during this period, and it will automatically exit to monitoring mode.
4. Using the calibration cap apply a suitable concentration of gas greater than
the highest alarm set point of the controller.
5. If the difference between the detector's gas reading and the applied gas
concentration is outside the acceptable limits for the application, you should
re-calibrate the detector (see instructions in step 6a). Otherwise, if the
accuracy is within acceptable range, the instrument should be returned to
monitoring mode (see instructions in step 6b).
6. In either case, allow the gas to purge and then exit the test mode by swiping
the magnet once over the oval mark during the test mode. The instrument
then displays " rESEt " for 15 seconds.
a. To enter the calibration mode, wait for the instrument to time out of the
" rESEt " display mode and the instrument enters the calibration mode
(for more details on calibration, see step 3 of section 8.3.1 for toxic
version or step 3 of section 8.3.2 for Oxygen version). After
calibration, if reading is still inaccurate, replace the sensor (see
section 11.1).
b. During the " rESEt " display mode, if the instrument detects a magnet
swipe, the instrument will reset itself, start from the power-on
sequence and go back to the monitoring mode.
7. Repeat for all detectors in the system.
8. When complete ensure the control panel is taken out of inhibit.
10.3 Detector operational life
Typical life of a toxic gas sensor is dependant on the application, frequency and
amount of gas exposure. Under normal conditions (3 monthly visual inspection and
6 monthly test / re-calibration) the toxic sensor has an expected life equal to or
greater than the lifetime as listed below:
12 months for Ammonia sensor
24 months for Oxygen and other toxic sensors
Refer to section 11 for sensor replacement procedures.
Caution: Oxygen deficient atmospheres (less than 6%V/V) may suppress
the sensor output.
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MAN0853 Issue 3 10/08
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