Heinrichs Messtechnik GmbH
Page 10 of 31
Ex-Supplement operating manual
UMC4 with TM/TMU/TME/TMR/TM-SH
4.3
Mounting
The mounting instructions for the standard sensor also apply to the explosion-proof sensor.
4.3.1
Thermally insulated sensor
The explosion-proof sensor can be outfitted with thermal insulation in potentially explosive atmospheres as
well. However, the insulation should only cover half of the support tube on which the junction box or integrated
transmitter is mounted.
4.3.2
Heated sensor
To avoid crystallization in the flow tubes, the sensor can be externally heated. Any heating technique or device
may be used. By use of electrical heating devices, these must be suitable for use in the potentially explosive
environments.
It is the operator’s responsibility to ensure that the heating temperature does not exceed the maximum
allowable temperature for the fluid and/or the maximum allowable temperature range for the potentially
explosive atmosphere in which the device is being operated.
The maximum allowable temperature range for the fluid is indicated on the flow meter rating plate.
It is also the operator’s responsibility to ensure that no hazards are created by hot sur
faces pursuant to
EN 1127-1 (Explosive atmospheres - Explosion prevention and protection) paragraphs 5.2 and 6.4.2.
4.3.3
Connection sensor
–
transmitter
Compact meters (sensor and transmitter form a unit and are connected electrically)
The electrical connection is made by the manufacturer. Furthermore the proof of the intrinsic safety of the
sensor circuits (according EN 60079-14) was carried out by the manufacturer and ensured. For these circuits no
action is required by the operator.
Remote installation
A dedicated cable
SLI2Y (SP) CY 5 x 2 x 0.5 mm²
[
blue
] is to be used for the electrical connection between
sensor and remote mount transmitter. This cable, which is available from Heinrichs Messtechnik, has five
twisted pairs, each of which has a foil shield and filler cord. The filler cords are to be installed
on the “shield”
terminal in both the sensor and transmitter. The five twisted wire pairs are themselves shielded by tinned
copper wire mesh. This external cable shield is connected to the housing via a dedicated EMC cable fitting, thus
ensuring optimum noise immunity.
Schirm / shield
10
9
8
5
7
6
4
3
2
1
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-
-
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-
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-
-
-
-
rosa / pink
grau / grey
schwarz / black
violett / violett
blau / blue
rot / red
gelb / yellow
grün / green
weiß / white
braun / brown
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-
-
-
-
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Schirm / shield
10
9
8
5
7
6
4
3
2
1
rosa / pink
grau / grey
schwarz / black
violett / violett
blau / blue
rot / red
gelb / yellow
grün / green
weiß / white
braun / brown
