OI/LMS100-EN Rev. A |
LMS100 Magnetic Level Gauge Switch 7
5.2.3 Flame Proof / Explosion Proof
Installation Requirements (Ex d):
The LMS100 is designed for use in Zone 1 / Division 1 hazardous
areas.
Installation and use of apparatus in hazardous locations shall
be in accordance with an IEC 60079-14 or applicable regional
standard.
If conduit is used in the installation, an approved conduit seal
or stopping box is required immediately after (ATEX/IECCEx)
or within 18 inches of (FM/FM-C/CSA) the end-use field wiring
entrace.
Internal temperatures of the LMS100 can reach up to 257°F
(125°C) when operated at maximum process and maximum
ambient temperatures. The service temperature range of cable
glands and field wiring shall be chosen accordingly.
Temperature classifications of the LMS100 are dependent on the
temperature of the coupled process vessel. Use the table below
to determine temperature class:
Maximum Process Temperature
Temperature Class
-40°F (-40°C) ≤ T ≤ 167°F (75°C)
T6
167°F (75°C) < T ≤ 194°F (90°C)
T5
194°F (90°C) < T ≤ 257°F (125°C)
T4
257°F (125°C) < T ≤ 374°F (190°C)
T3
374°F (190°C) < T ≤ 554°F (290°C)
T2
554°F (290°C) < T ≤ 780°F (416°C)
T1
5.2.4 Protection by Enclosure
Installation Requirements (Ex tb):
Field wiring fittings such as cable glands and conduit must main
-
tain the ingress protection rating of the enclosure (IP6X).
Not suitable for use in uncontrolled dust environments.
Temperature classification of the LMS100 is related to process
temperature. The temperature class of the LMS100 can be deter-
mined by using the relationship below:
Max Process Temp
Temperature Class
176 °F (80 °C)
185 °F (85 °C)
203 °F (95 °C)
212 °F (100 °C)
266 °F (130 °C)
275 °F (135 °C)
383 °F (195 °C)
392 °F (200 °C)
563 °F (295 °C)
581 °F (305 °C)
780.8 °F (416 °C)
798.8 °F (426 °C)
Temperature Class vs. Process Temperature
T
CLASS
= T
PROCESS
+ 10°C,
when T
PROCESS
> 200°
C
T
CLASS
= T
PROCESS
+ 5°C,
when T
PROCESS
>
70°
C
T
CLASS
=
75°C, when
T
PROCESS
≤ 70°
C
450
400
350
250
200
150
100
50
0
Temperatur
e Class (°C)
Process Temperature (°C)
-100 -50
0
50
100 150 200 250 300 350 400 450
