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Zeroing
Figure 59: zero test.
1. Go to the Test menu using the IR20 remote control. The relays will be
blocked for 5 minutes.
2. Place the calibration hood over the detector head (Figure 59, B).
3. Connect the calibration hood to the bottle of clear air (Figure 59, E) using a
piece of flexible tubing (Figure 59, C).
4. Open the valve on the bottle of clear air (flow rate of 30-60 l/h or 60-120 l/h
for OLCT IR versions) (Figure 59, D).
5. After the reading has stabilized (after about 2 minutes) read the detector's
display (Figure 59, A).
6. If the value does not fall within the proper range, follow the calibration
procedure (Zeroing and adjusting sensitivity, on page 80).
7. Continue to the instructions under Gas sensitivity test below.
Gas sensitivity test
1. Once the zero test has been performed, connect the calibration hood to the
calibration gas bottle (Figure 59, E) using a piece of flexible tubing (Figure 59, C).
2. Open the valve (Figure 59, D) on the calibration gas bottle (flow rate of 30-60 l/h
or 60-120 l/h for OLCT IR versions).
3. Once the reading has stabilized (after about 2 minutes), view the display.
4. If the value does not fall within the proper range, follow the calibration
procedure (Zeroing and adjusting sensitivity, on page 80).
5. Close the bottle's valve (Figure 59, D) and remove the calibration hood
(Figure 59, B). Wait until the measurement reading returns to zero and leave
the Test menu by pressing ESC on the IR20 remote control. This completes
the zero and gas sensitivity test procedure. The detector may now be used.
6 – Operation
72
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