CiDRA Sonar Process Monitoring System - Manual (Page 9)

The +100 ºC rating relates to the safety aspect only and is intended to
include the effects of heating from the pipe on which it is mounted. To
achieve good operating performance in addition to safety, the pipe can
be at temperatures up to 100 ºC, but the air temperature in the vicinity
of the pipe should be no greater than ~60 ºC. If the pipe temperature
is greater than ~60 ºC, it is recommended that there be no coverings
or obstructions that would prevent free air movement around the
outside surface of the sensor head enclosure. If installed properly, it
will not produce a hot-spot temperature in excess of 135 ºC during
normal operation.
This sensor head is only to be used with Transmitter TB8-xx-xx-xx-03
(not TB8-xx-xx-xx-04), which provides an energy-limited interface to it.
This permits the convenience of being able to disconnect the sensor
head cable connector from the sensor head cover with the power on
with a reduced risk of generating a spark with sufficient energy to
trigger an explosion if an explosive atmosphere happens to be
present.
Note: In Zone 2, explosive atmospheres are not expected to be
present except under fault conditions. If the operator is aware that a
fault condition exists at the facility that makes it likely that an explosive
atmosphere is present, then extra caution is indicated.
2.3 Transmitter [TB8-xx-xx-xx-04]:
II 3 G Ex nA nL IIC T4 -20C<=T
amb
<=+57C IP55
DEMKO 07 ATEX 0608105X
This particular model of transmitter can be installed in a safe area or
an area that is classified as an Equipment Group II (not in mines),
explosive gas (not explosive dusts or fibers), ATEX Zone 2 location
with any of the explosive gas groups, including the most explosive
group, IIC. Its enclosure has been tested to IP55 (the second-to-
highest dust rating and the rating for low-pressure water jets). It is
intended for an operating ambient air temperature range of -20 ºC to
+57 ºC. If installed properly, it will not produce a hot-spot temperature
in excess of 135 ºC during normal operation.
The transmitter includes no energy-limited interfaces. It cannot be
used in conjunction with the SH-xxx-xx-xA-xxx-03 Sensor Head. It
can only be used with a separately certified sensor head and the
wiring to that sensor head must be selected and installed in
accordance with rules for incendive wires in hazardous areas.
Note: In Zone 2, explosive atmospheres are not expected to be
present except under fault conditions. If the operator is aware that a
fault condition exists at the facility that makes it likely that an explosive
atmosphere is present, then extra caution is indicated.
20909-01C Rev 04 Page 2-2