KROHNE BM 70 A Installation And Operating Instructions Manual page 23

6.1.7 Special options for the flange
Antenna heating/cooling device (> DN150/6")
Double-walled antenna for cooling or heating,
e.g. to avoid condensation (recommended for
liquid sulphur).
max. differential pressure at antenna:
Standard DN150
= 6 bar (87 psig) (information on other pressure
levels provided on request)
Hazardous-duty systems:
In Zone 0, the temperature of the
1.
heating system and antenna may
not exceed 80 % of the ignition
temperature of the stored material.
Continuous monitoring shall
2.
ensure, and operational inspections
shall verify, that the 80% level of
the ignition temperature stated in
Point 1 above is not exceeded
6.1.8 Ultimate installation on the tank
• After carefully positioning the BM 70 A/P on the
tank fitting flange (not forgetting the gasket),
align the BM 70 A/P and the gasket.
• Insert stud bolts and tighten nuts slightly (by
hand). (These items not included with supply).
• Press shielding strip C* in the gap between
tank flange and the BM 70 A/P flange and
secure with strap retainer S* (both items
included with supply).
• Strap retainer S* must fit closely and overlap
both flanges.
* only required for European radio approvals
• Tighten down stud bolts and nuts firmly. The
torque is dependent on the strength properties
of the stud bolts and the pressure rating of the
tank.
Installation and operating instructions BM 70 A/P
Purging device (> DN100)
With connection for purging the inside surface
of the antenna to prevent heavy deposits of
product or to heat or cool the antenna.
If a liquid is used for purging, this may interfere with the
functioning of the BM 70 A/P during the process.
Continuous purging with gas is not a problem as it does
not interfere with measurements.
The purge connection is closed off by the manufacturers
with a ¼" screw. When this screw is removed to connect
up a purging system, the operator is responsible for
ensuring conformity
connection with the purging circuit (e.g. fitting a flame
trap).
.
C* = shielding strip
S* = strap retainer
with "Ex" requirements
B = BM 70 A/P flange
F = tank flange
Page: 23
in
11/00