BERTHOLD TECHNOLOGIES LB 480, Руководство пользователя, Страница: 177 / 450

SENSseries LB 480 Level measurement
BERTHOLD TECHNOLOGIES GmbH & Co. KG
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Volume 2 2 Installation
2
2.3
Detector Protection
Risk of damage!
The detector may be damaged due to strong mechanical stress,
vibrations and high temperatures.
Prevent heat transfer from the detector holder to the detector by
using a suitable heat-neutralizing suspension.
2.3.1 Cooling
The ambient temperature must not exceed the values specified in
the technical data (see
Volume 2 , chapter 1.5 , page 2-162 ). If tem-
peratures exceeding 50° C are expected, you have to use a detector
with water cooling jacket (see
page 2-187 ). The cooling water cycle
has to remain in operation even when the detector is turned off, if
the maximum operating temperature is likely to be exceeded.
Risk of overheating!
A failure of the water cooling or insufficient flow can overheat and
thus destroy the detector.
The maximum ambient temperatures are listed in the technical data
in
chapter 1.5 , page 2-162 . In addition:
• To prevent freezing, the water cooling system must be drained.
• Polluted cooling water may clog the water cooling system,
which may result in the detector getting overheated and
destroyed. It is therefore essential to use clean cooling water.
• The water pressure in the cooling jacket must not exceed 6 bar.
Water cooling in Ex-areas
The information in the Safety Manual regarding the ambient tem-
perature for explosion protection also apply to the operation of a
water cooling on detectors that are used in hazardous areas.
Detector temperature monitoring
The detector includes an internal temperature measurement which
can be used to trigger a pre-alarm if higher temperatures are mea-
sured. The temperature switching point can be adjusted (see
Vol-
ume 3, chapter 2.32 ). The alarm can be picked up at the digital out-
put. If you operate the water cooling so that the temperature at the
detector remains below 40° C, you could switch off the detector on
exceeding a temperature limit of e.g. 50° C prematurely to protect
the detector against overtemperature.