CiDRA Sonar Process Monitoring System - Manual (Page 19)

condensation. Care should be taken during commissioning to verify
that the electronics do not have accumulated condensed water or frost
on them prior to powering them.
7.4 Water Spray and Dust
Both transmitters (TB8-xx-xx-xx-03 or TB8-xx-xx-xx-04) and the
sensor head (SH-xxx-xx-xA-xxx-03) are rated IP55. This means that
they offer the next-to-highest degree of protection against dust and
protection against low-pressure water jets (but not against high
pressure jets or immersion).
The installation location must be consistent with the IP ratings of these
enclosures. Installation and operating procedures must be designed
to ensure that the electronics inside the enclosures stay clean and dry.
Installers must take care to assure that the seals mate properly, the
latches are latched tightly, and that appropriate accessories (for
example, cable glands with the appropriate ratings – see paragraph
8.3.1) are properly selected and installed.
These flow meters are for permanent installations. Cables must be
routed and installed by means that protect them from damage. They
should be secured near their terminations to prevent pulling and
twisting at the cable glands.
Note: The explosion protection certification is for explosive gasses but
not for explosive dusts or flyings.
7.5 Explosive Gasses
If so marked, the sonar process monitoring system is rated for Class I,
Zone 2 use in any of the defined explosive gas groups, including the
most explosive category, IIC.
The T4 rating of the sonar process monitoring system means that if it
is operated within the allowed range of ambient temperatures, the hot
spot temperatures should not exceed 135 ºC under normal operating
conditions.
7.6 Condition of piping
The Zone 2 safety of the sensor head is dependent, in part, on
keeping the electronics underneath the clamp-on sensor head cover
clean and dry. This means that leaks in the piping under the sensor
head cover are not anticipated.
Inspect the pipe prior to installation and periodically thereafter for
evidence of impending pipe leaks and take appropriate preemptive
action. The specifics of the pipe inspections and the frequency of the
periodic monitoring depend on the customer’s knowledge of their
facility and the history of pipe leaks.
20909-01C Rev 04 Page 7-3