ABB KM26 Operating Instruction page 8

8
KM26 | M AGN ETI C L EV EL G AU GE | O I/KM 26 -E N REV I
. . . 2 Safety
Possible grounding locations with a pipe clamp, pipe strap
or ring terminal on flange stud.
Figure 5 - Grounding locations
Temperature considerations
The KM26 is capable of operation in extreme environments.
Special consideration must be given to the components
attached to the KM26 when used at these extremes.
At high temperatures, scales, switches, and transmitters
must be protected from the adverse effects of these
temperatures on their internal components. High
temperature insulation is frequently used to raise the limits at
which these devices may operate. This insulation should not
be removed without adequate replacement. These devices
rely on proximity with the chamber to operate, therefore any
replacement insulation should not increase the separation of
the device from the float. Any additional insulation installed
should not trap unwanted heat in these devices.
At low temperatures, condensation, frosting, and freezing are
a concern. Insulation for these conditions is provided as an
option and in some cases, it is highly recommended. Special
indicator tubes are made to reduce the effects of cryogenic
chambers on the indicator. These indicator tubes require
insulation that can be provided as an option.
Recommendations for this insulation are included at the end
of this manual. Low temperatures also cause embrittlement
of some metals. Chambers and flange bolting must meet the
temperature specifications. ABB does not recommend
customer application of cryogenic insulation.
Temperature classification
Temperature classifications of the ATEX approved KM26 is
limited to process temperatures up to 50C below the
maximum surface temperature allowed for each of the
temperature classes as per the below table.
Temperature
class (Ex db)
T6
T5
T4
T3
T2
T1
Table 1 - ATEX constructional safety temperature classfication
ATEX constructional marking
II 2 G c TX (external)
II 1 G c TX (internal)
Applicable standards: EN134653-1:2009; EN13463-5:2001
Pressure equipment directive (PED)
(97/23/CE)
Based on the order, the product shall conform to the EC
directives listed in the device specific EC declaration of
conformity. It is designed in accordance with safe engineering
pratices to meet state of the art safety requirements, has
been tested and left the factory in a condition in which they
are safe to operate.
Storage and handling information
To prevent damage to the shipping tubes and / or crates that
the level gauges are transported in, these items should not be
over-exposed to inclement weather. The KM26 magnetic level
gauge should be stored in such a manner that would not
allow the indicator tube to be immersed or submerged in any
liquid. Sufficient precautions should be taken so that the
glass or polycarbonate indicator tubes are not broken or
damaged. There are no special storage requirements for the
EC chamber themselves, but if there is a transmitter and / or
switch, the storage requirements of the transmitter and / or
switch must be met. See data sheets for specific requirement.
• after unpacking the, inspect it for damage.
• check the packaging for accessories.
• during intermediate storage or transport, only store the
level gauge in the original packaging.
• if required, storage prior to installation should be indoors
at ambient temperatures, not to exceed ambient
conditions as specified in the individual datasheet of the
accessories.
For information on permissible ambient conditions for
storage and transport, refer to the specification section of
the datasheet. Although there is no limit on the duration of
storage, the warranty conditions stipulated on the supplier's
order of acknowledgement still applies.
Max . process Max . surface
temperature temperature
< 80 °C
< 95 °C
< 130 °C
<195 °C
< 295 °C
< 445 °C
85 °C
100 °C
135 °C
200 °C
300 °C
450 °C