proprietary chamber flanges, are available. See Proprietary flanges to identify the
proprietary flanges.
• See Table 3-14 for guidelines on which disc size to use.
• See Table 3-8 for guidelines on the required probe length.
Table 3-8: Required Probe Length in Chambers
Chamber manufacturer Probe length
(1)
Major torque-tube manufacture (249B, 249C,
249K, 249N, 259B)
Displacer + 9 in. (229 mm)
Masoneilan
™
(Torque tube operated),
proprietary flange
Displacer + 8 in. (203 mm)
Other - torque tube
(2)
Displacer + 8 in. (203 mm)
Magnetrol
®
(spring operated)
(3)
Displacer + between 7.8 in. (195 mm) to 15 in.
(383 mm)
Others - spring operated
(2)
Displacer + 19.7 in. (500 mm)
(1) If flushing ring is used, add the ring height to the probe length.
(2) For other manufacturers, there are small variations. This is an approximate value, actual length
should be verified.
(3) Lengths vary depending on model, SG and rating, and should be verified.
For additional information, see the Replacing Displacers with Guided Wave Radar
Technical Note.
Insulation of the chamber
For hot applications, the chamber should always be insulated to prevent personal injuries
and to reduce the amount of energy needed for heating. See Figure 3-9. It is often an
advantage, and sometimes even required, for the radar measurement:
• In hot applications, insulation reduces the amount of condensation, since it prevents
the upper part of the chamber from becoming a cold spot.
• Insulation prevents product solidification inside the chamber, and clogging of the inlet-
pipes.
Reference Manual Mechanical installation
00809-0100-4530 April 2019
Reference Manual 39
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