Concept And Safety; Irmax Concept; Safety Information - Crowcon IRmax Installations-, Bedienungs- Und Wartungsanleitung

IRmax concept

IRmax is an ultra-compact infrared (IR) gas detector, which delivers rapid, fail-safe detection
of hydrocarbon gases and vapours.
Featuring dual-wavelength IR sensor technology in a rugged 316 stainless steel package,
IRmax is designed to operate in the harshest conditions. Unlike conventional IR gas detectors,
IRmax does not incorporate heaters to prevent condensation on windows and mirrors. The
S IR coating on optical components prevents condensation forming while the detector is operating.
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IRmax is compatible with any 4-20mA control system, and can also be installed in an RS485
Modbus addressable network (see Section 7).
IRmax requires only 1 Watt of power, typically 75-90% lower than conventional IR gas detectors.
IRmax features a compact diffusion gas chamber, which in combination with an effective
weatherproof cap provides excellent speed of response. The weatherproof cap has been
designed using flow modelling software to enable remote gassing and calibration of the
IRmax without requiring a special calibration cap.
The IR Display makes it possible to monitor readings from the IRmax both locally and
remotely. An IR Display can be fitted directly to IRmax. Alternatively, IRmax may be
supplied with an Intrinsically Safe (IS) Barrier module attached. An IR Display can then
be connected to the IS Barrier Module via temporary or permanent cabling. The available
options are illustrated on Diagram 3, page 4.
For further information about other accessories for the IRmax see Diagram 3 on page 4 and
Section 5, page 15.

Safety information

• IRmax gas detectors must be installed, operated and maintained in strict accordance
with these instructions, warnings, label information, and within the limitations stated.
• The rear nut on IRmax must be kept tightly closed during operation. Do not attempt
to remove the rear nut until power to the detector is isolated - otherwise ignition of a
flammable atmosphere can occur. Before removing the nut for maintenance, calibration
or servicing, check that the surrounding atmosphere is free of flammable gases or
vapours. Do not open until several minutes after the power has been removed.
• Maintenance and calibration operations must only be performed by qualified service personnel.
• Only genuine Crowcon replacement parts must be used; substitute components may
invalidate the certification and warranty of the IRmax.
• IRmax must be protected from extreme vibration, and direct sunlight in hot
environments as this may cause the temperature of the IRmax to rise above its specified
limits and cause premature failure.
• IRmax will not detect hydrogen, ammonia or carbon dioxide.
• The equipment must be earthed using the cable gland and steel armoured cable.

Concept and safety

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