Testing And Commissioning; Specifications - Crowcon IRmax Instructions D'installation, D'utilisation Et De Maintenance

5. Check that the midline hole indicated corresponds to the direction of the flow in the air
duct.
6. Using a centre punch, mark the six centres indicated (Diagram 4 on page 4). At each
corner, there needs to be a hole for a screw. In the centre, the hole needs to be big
enough to accommodate the duct boss. If remote calibration is required, there has to
be an extra hole at the top as shown on Diagram 3 and Diagram 4 on page 4.
7. Remove burrs and sharp edges around the six holes.
8. The next step is to attach the duct tube to the duct mount boss. This has to be done
in such a way that the inlet to the pipe faces the airflow, while the air outlet faces
downwards for drainage, and the calibration gassing hole is vertically above the main
ring. This is to ensure that the drain hole of the plate is below the pipe. Plan this carefully
to ensure the orientation will be correct.
9. Fit the nuts provided and tighten.
10. Secure the casting to the duct using suitable bolts.
11. Remove and discard the detector's weatherproof cover to reveal a suitable thread for
attaching the IRmax to the duct boss. Install the IREX or IRmax by screwing it into the
duct boss (about 3 turns).
12. Connect the cable as instructed in the installation, operating, and maintenance
instruction manual supplied with the detector.
13. CHECK THAT THERE IS NO AIR LEAKAGE INTO THE SAMPLING CHAMBER FROM
OUTSIDE THE DUCT, THROUGH THE PROBE JOINTS, CABLE GLANDS OR COVER GASKET.
USE PTFE ON THE IREX/IRMAX THREAD IF REQUIRED.

3.2 Testing and commissioning

Calibrate the detector according to its instructions. Test the operation of the duct probe by
introducing a gas and air mix into the duct. This step is particularly important if the length
of the section of duct is less than six times its width.
WARNING: It is essential to ensure that procedures are in place to prevent people
and/or equipment being affected by any test gas introduced into the ventilation
system.

3.3 Specifications

Air speeds
Operating temperature range
Detecting Gas Saving Lives Detecting Gas Saving Lives
0.5 m (1.6 ft)/s to 20m (65.6 ft)/s
0°C to 60°C
Duct mounting kit Duct mounting kit
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