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English
Safety information
•
Xgard IR
gas detectors must be installed, operated and maintained in strict accordance with
these instructions, warnings, label information, and within the limitations stated.
•
The lid on
Xgard IR
must be kept tightly closed until power to the detector is isolated oth
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erwise ignition of a flammable atmosphere can occur. Before removing the cover for main
-
tenance or calibration purposes, ensure the surrounding atmosphere is free of flammable
gases or vapours.
•
Maintenance and calibration operations must only be performed by qualified service
personnel.
•
Only genuine Crowcon replacement parts must be used, substitute components may invali
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date the certification and warranty of the detector.
•
Xgard IR
detectors must be protected from extreme vibration, and direct sunlight in hot
environments as this may cause the temperature of the detector to rise above its specified
limits and cause premature failure. A sunshade is available for
Xgard IR
.
•
This equipment must not be used in a Carbon Disulphide atmosphere.
•
Xgard IR
will not detect hydrogen.
•
Xgard IR
detectors are certified for use in atmospheres that may contain flammable dusts.
They will not however detect the presence of flammable dust, and the response of the gas
sensor may be compromised by becoming blocked in a dusty environment
. Xgard IR
detec-
tors should be inspected regularly if used in a dusty environment.
•
For Exd certified
Xgard IR
cable glands with a sealing compound must be used where
Group IIC gases are likely to be present (ref: EN60079-14:2008 section 10.4.2).
Hazardous area classifications:
Zone 0: An area classified as Zone 0 will have ignitable concentrations of flammable gases,
vapours or liquids either continuously present or present for long periods of time under
normal operating conditions. Intrinsically Safe (Exia) detectors are suitable for use in
Zone 0, provided they are connected via a suitable zener barrier or galvanic isolator.
Zone 1: An area classified as Zone 1 is likely to have ignitable concentrations of flammable gases,
vapours or liquids present under normal operating conditions. Flameproof (Exd) detectors
are suitable for use in Zone 1. Intrinsically Safe (Exia) detectors are suitable for use in
Zone 1, provided they are connected via a suitable zener barrier or galvanic isolator.
Zone 2: An area classified as Zone 2 is not likely to have ignitable concentrations of flammable
gases, vapours or liquids present under normal operating conditions. Flameproof (Exd)
detectors are suitable for use in Zone 2. Intrinsically Safe (Exia) detectors are suitable
for use in Zone 2, provided they are connected via a suitable zener barrier or galvanic
isolator.
Areas that may contain flammable dusts are categorized as Zone, 20, Zone 21 and Zone 22.
Notes:
In North America ‘Divisions’ are used to categorise risk where:
Division 1 is equivalent to Zone 0 or 1
Division 2 is equivalent to Zone 2
Under European ATEX rules hazardous area equipment has been re-defined under ‘equip-
ment categories’ where:
Equipment Category 1 is suitable for Zone 0
Equipment Category 2 is suitable for Zone 1
