Thermalert GP Series Operator’s Manual 59
B.7.1.3 Atmospheric Quality
It is important to keep the lens clean at all times. A clean lens can prevent
erroneous readings and possible lens damage. An Air Purge Collar is avail-
able, and recommended, for all models to protect the lens from smoke,
fumes, dust, and other contaminants.
B.7.1.4 Electrical Interference
To minimize electrical or electromagnetic interference or “noise,” be aware of
the following:
• Mount the sensor as far away as possible from potential sources of elec-
trical interference such as motorized equipment producing large step
load changes.
•With a regular sensing head, use solid or flexible conduit between the
head and electronics box. Check continuity to ensure a good connec-
tion of the conduit between the sensor head and electronics box. For a
good connection, the ends of the conduit should make metal to metal
contact with the sensor head and the electronics box.
• Use shielded wire for all input and output connections. Connect the
shield as described in the sensing head tables in Section B.2.
• Make sure the shield wire in the sensor cable is earth grounded.
• For additional protection, use conduit for the AC power lines and any
external connections. Solid conduit is better than flexible conduit in
high noise environments.
• Do not run AC power for other equipment in the same conduit.
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