CiDRA SONARtrac PW VF-100 - Manual (Page 36)

20831-01 Rev 05 Page 5-18
Figure 13 Installed Sensor Band
CAUTION
Over-tightening of fasteners may damage threads on the sensor.
Under tightening may affect flow meter performance. Always
use the sensor fastener spacer tool to ensure proper fit of the
sensor assembly.
5.6.3 Sensor Band Short Test
Shorting of the sensor band to the process pipe may cause signal
interference or electrical faults in the system in some instances. It is
also an unsafe condition for installations in hazardous (classified)
locations. The sensor band must be electrically isolated from the
process pipe.
WARNING
EXPLOSION HAZARD – The sensor band must be electrically
isolated from the pipe to prevent ground loops which are
considered unacceptable under the hazardous area safety
standards.
Use an ohm meter and verify the sensor band is isolated from the
pipe. Measure the resistance between the sensor rails and the pipe to
ensure there is no continuity between the sensor band and the
process pipe. If the band is shorted identify where the short is located
and eliminate the short. For example, if a sensor screw is shorting to
a pipe weld bead, reposition the sensor band, or file down the weld
bead to eliminate the possibility of a short.
Sensor cable installed
in cable retaining clip
Sensor screws
tightened Sensor cable connector with
shorting plug installed
Alignment pins
Compliant sheet