5
GENERAL CALIBRATION PROCEDURE
1.
Verify that the detector is NOT in alarm and does not have a fault condition (i.e., it
must not have a continuous orange LED).
2. Verify that the calibration gas is in a balance of air, not Nitrogen (N2).
3.
Fit testing hood to the fascia plate (7) or base plate (6) (see below).
4. Ensure switch 8 is OFF . The buzzer will be OFF and the LED will be OFF.
5. Connect the tubing to the barbed fittings of the pressure regulator and testing
hood.
6. Verify that gas flow is approximately 0.3 to 1.0 L/min.
7. If operation is intended to be at higher altitudes, the factory calibration will result
in a reading lower than the reading at sea level (reduced partial pressure). A
new span adjustment is recommended if the altitude or the ambient pressure is
changed. The factory calibration is set to sea level.
8. Always perform a zero adjustment before a span adjustment.
4
1
2
3
5
1.
Flow meter
2.
Pressure regulator
3.
Calibration gas
4. Tubing
5. Testing hood (UK
version)
Warning:
Ambient air can be used to zero the sensor instead of synthetic
air only if the area is known to be free of the target gas or any gas to which
the sensor may be cross- sensitive. In this case, no cylinder or testing hood is
needed for the zero adjustment.
Figure 11. Details for Connecting Modbus
Communications Wiring
Zero Adjustment ( ... continued for General Procedure)
9. Tap and hold (
•
) for more than 5 seconds. The LED will blink green-green-red to indicate the detector is ready. Verify that the
calibration gas is in a balance of air, not Nitrogen (N2).
10.
Apply synthetic air (or use ambient air per the warning above).Set switch 8 to OFF. The buzzer will be OFF and the LED will be OFF.
11. Tap (
•
) within 30 seconds to confirm start of calibration. Otherwise the detector will time-out and return to normal operation.
12. As the process progresses, the LED will blink green-red, green-red-red, green-red-red-red, etc.
•
To abort calibration, tap and hold (
•
) for >5 seconds, turn off gas flow and remove the testing hood. The detector will return to
normal operation.
•
If calibration is successful (green LED), skip to step 15.
•
If calibration is unsuccessful (orange LED blinks @ 2 Hz), then tap (
•
) to discard the
13.
Turn off gas flow from synthetic air
14. Replace synthetic air tank with calibration gas tank in preparation for span adjustment.
Span Adjustment
15.
Tap and hold (
• •
) for >5 seconds. The LED will blink green-green-orange when the detector is ready.
16. Apply span gas in the concentration listed on the cal gas concentration label (beneath the detector’s cover plate). This may require the
temporary removal of the bezel and cover plate to see the label.
17.
Tap (
• •
) within 30 seconds to confirm initiation of the calibration. Otherwise the detector will time-out and return to normal
operation.Turn off gas flow from synthetic air
18. As the calibration process progresses, the LED will blink green-orange, green-orange-orange, green-orange-orange-orange, etc.
•
To abort calibration, tap and hold (
• •
) for >5 seconds, turn off gas flow and remove the testing hood. The detector will return to
normal operation.
•
If calibration is successful, the LED will blink green-orange-red indicating ‘offline’. Turn off gas flow and remove the testing hood.
After 6 minutes the detector will return to normal operation.
•
If calibration is unsuccessful (orange LED blinks @ 2 Hz), then tap (
• •
) to discard the calibration attempt, and see
Section 5.3 on
page 21
on the user manual for troubleshooting. Turn off gas flow and remove the testing hood. After 6 minutes the detector will
return to normal operation.
Bump Test
1.
Inform building personnel of test so that certain alarms may be inhibited (e.g. shutdown valves, notification of authorities, etc.).
2. Connect adapter and target gas according to instructions in General calibration procedure
3.
Apply a sufficiently high concentration of target gas to trigger alarms, but not pure refrigerant or hydrocarbons (e.g., do not use a
butane lighter), as this might damage the sensor.
4. Once the alarm thresholds are exceeded, all designated gas alarm relays will be activated and the digital outputs will transmit the
corresponding gas concentrations.
5. Turn off gas flow and remove testing hood.
