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F-Guard IR3 HD User Manual
There is an earthing point on the outside of the detector enclosure for
connection to Electrical ground
2.12.1 General recommendations
•
In general, correctly engineered star earthing arrangements minimize earth
current crosstalk and noise, improving the reliability and performance of
instrumentation.
•
The use of a single, screened/shielded cable for each field device ensures
good screening/shielding and reduces crosstalk.
Field Cabling
•
The entire length of the field cabling connected to a unit should be
screened/shielded. The screen/shield should be connected to a low noise
instrument earth at one end.
•
The screens/shields of field cabling must not be connected in a manner that
creates earth loops or that will result in the screens/shields carrying large
currents from heavy plants or equipment.
2.12.2 Interference and noise
•
Electrical equipment connected to the system should comply with applicable
national or international EMC standards.
•
Ideally, the 24 V supply reaching units should be free from large transients,
fluctuations, or high-frequency noise.
•
To reduce the likelihood of radio frequency interference affecting the
operation of units it is recommended that neither units nor their cabling is
installed close to the antennae of high-powered radio, radar or satellite
communication equipment.
