3 – Mechanical installation
13
Digital Modules
The cabling is the subject of the paragraph
Connection of digital
modules
on page 26.
Gas detectors
Refer to the manual supplied with each detector.
Location
Each detector is positioned at the ground level, on the ceiling, at the height of
the respiratory tract, or near air extraction ducts, depending on the density of
the gas to be detected or applied. Heavy gases are detected close to the
ground, while lighter gases are present along the ceiling. If necessary, contact
Industrial Scientific Oldham
for any questions regarding proper detector
positioning.
Fixing
The detectors shall preferably be positioned in an accessible place to facilitate
the operations of inspection and maintenance as well as the absolute safety of
the operators. The detectors must not be obstructed by anything that will
prevent them from measuring the ambient environment to be checked.
If mounting an OLCT10N on a vertical surface, position the cable gland
downwards.
Other models
Location
The relay modules, logic outputs, analog outputs, and analog inputs are
positioned depending on the installation layout, mandatorily in places free
from explosive atmospheres, protected from humidity, dust, and temperature
variations; for example in technical cabinets.
Fixing
These modules shall be mounted on
a DIN rail in a cabinet or in an
electrical cabinet.
For relay modules connected to low
voltage electrical parts, the
installation is carried out per the
standards in force.
134
Figure 7: Fixing of a module (relay, logic
outputs, or analog outputs or inputs) on a
DIN rail.
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