Installation Instructions
TM888300 Rev. (Al), August 2019
43
•
If the equipment is likely to come into contact with aggressive substances as
described below, then it is the responsibility of the user to take suitable
precautions to prevent the equipment from being adversely affected, thus
ensuring that the type of protection provided by the equipment is not
compromised.
•
Examples of aggressive substances: acidic liquids or gases that may
attack metals, solvents that may affect polymeric materials
•
Examples of suitable precautions: routine inspections, establishing
resistance to specific chemicals
from the material’s data sheets.
•
Special conditions for safe use: The Quasar 950/960 Open Path Gas Detectors
and UV Source Units should not be used as safety related devices, in
accordance with directive 2014/34/EU.
6.4.2
Special Conditions for Safe Use
•
The dimensions of the flameproof joints differ from the relevant minimum or
maximum values required by Table 2 of IEC/EN 60079-1:2007 for IIB + H
2
,
as detailed below:
Flamepath Description
Type of
Joint
Minimum
Width
“
L
”
(mm)
Maximum
Gap
“
i
C
”
(mm)
Cylindrical section of spigot (both
ends of Ex d compartment)
Cylindrical
15
0.08
30mm diameter window fitted
against enclosure
Flanged
10.7
0.02
39.5mm diameter window fitted
against enclosure
Flanged
10
0.02
•
Gaps, “i
c
,”
should not be modified to be any larger, and widths, “L,” should not
be modified to be any shorter than the values shown in the table above.
•
Connections to the IS port on the side of the detector enclosure should be
made using equipment that maintains the intrinsically safe levels of
protection.
•
The Um should be installed in accordance with one of the following:
•
The Um is 18
–
32VDC, in a SELV/PELV system
•
Via a safety isolating transformer complying with the requirements of IEC
61588-2-6 or technically equivalent standard
•
Directly connected to apparatus complying with IEC 60950, IEC 61010-1,
or technically equivalent standard
•
Fed directly from cells or batteries