5 heating – FMC Corporation - Talstar 80 Benutzerhandbuch
Seite 20
Installation
Proline Promass 80 PROFIBUS PA
20
A0010008
Fig. 13:
Promass I, mounted with mounting clamp
3.2.5
Heating
Some fluids require suitable measures to avoid loss of heat at the sensor. Heating can be electric,
e.g. with heated elements, or by means of hot water or steam pipes made of copper or heating
jackets.
"
Caution!
• Risk of electronics overheating! Make sure that the maximum permissible ambient temperature
for the transmitter is not exceeded. Consequently, make sure that the adapter between sensor and
transmitter and the connection housing of the remote version always remain free of insulating
material. Note that a certain orientation might be required, depending on the fluid temperature.
• With a fluid temperature between 200 °C to 350 °C (392 to 662 °F) the remote version of the
high-temperature version is preferable.
• When using electrical heat tracing whose heat is regulated using phase control or by pulse packs,
it cannot be ruled out that the measured values are influenced by magnetic fields which may
occur, (i.e. at values greater than those permitted by the EC standard (Sinus 30 A/m)). In such
cases, the sensor must be magnetically shielded (except for Promass M).
The secondary containment can be shielded with tin plates or electric sheets without privileged
direction (e.g. V330-35A) with the following properties:
– Relative magnetic permeability μ
r
≥ 300
– Plate thickness d
≥ 0.35 mm (0.0011")
• Information on permissible temperature ranges
Special heating jackets which can be ordered as accessories from FMC Technologies are available
for the sensors.
Esc
Esc
E
-
+
1
2
3
0.83 in/3.28 ft ( 2%)
~
DN
8
15
15FB
25
25FB
40
40FB
50
50FB
50FB
80
80
Tri-Clamp
½"
3/4"
1"
1"
1 ½"
1 ½"
2"
2"
2 ½"
3"
2 ½"
3"
A
373
409
539
539
668
668
780
780
1152
1152
1152
1152
B
20
20
30
30
28
28
35
35
57
57
57
57
C
40
40
44.5
44.5
60
60
80
80
90
90
90
90