
140
Reference Manual
00809-0100-4811, Rev DA
Appendix A: Reference Data
January 2015
Reference Data
Table A-7. Minimum Clearance
Table A-8. Required Probe Length in Chambers
Table A-9. Centering disc dimensions
Coaxial Rigid twin lead Flexible twin
lead
Rigid single
lead / segmented
rigid single lead
Flexible single
lead
Recommended
nozzle
diameter
Enough space to
fit the probe
(1)
(1) Probe diameter is 1.1 in. (28 mm) for standard probes.
4 in. (10 cm) or
more
4 in. (10 cm) or
more
6 in. (15 cm) or
more
6 in. (15 cm) or
more
Min. nozzle
diameter
(2)
(2) Requires special configuration and setting of UNZ.
Enough space to
fit the probe
(1)
2 in. (5 cm) 2 in. (5 cm) 2 in. (5 cm) 2 in. (5 cm)
Min. clearance
to tank wall or
obstruction
(3)
(3) The minimum clearance from tank bottom for the coaxial and rigid single probes is 0.2 in. (5 mm).
0 in. (0 cm) 4 in. (10 cm) 4 in. (10 cm)
4 in. (10 cm) if
smooth metallic
wall.
12 in. (30 cm) if
disturbing objects,
rugged metallic or
concrete/plastic
wall.
4 in. (10 cm) if
smooth metallic
wall.
12 in. (30 cm) if
disturbing objects,
rugged metallic or
concrete/plastic
wall.
Min. pipe /
bypass
diameter
1.5 in. (3.8 cm) 2 in. (5 cm)
(4)
(4) The center-most lead must be at least 0.6 in. (15 mm) away from the pipe/bypass wall.
Consult your local
Emerson Process
Management
representative.
2 in. (5 cm)
(5)
(5) The probe must be centered in the pipe/bypass.
Consult your local
Emerson Process
Management
representative.
Chamber manufacturer Probe length
(1)
(1) If flushing ring is used, add the ring height to the probe length.
Major torque-tube manufacture
(249B, 249C, 2449K, 249N, 259B)
Displacer + 9 in. (229 mm)
Masoneilan (Torque tube operated), proprietary flange Displacer + 8 in. (203 mm)
Other - torque tube
(2)
(2) For other manufacturers, there are small variations. This is an approximate value, actual length should be verified.
Displacer + 8 in. (203 mm)
Magnetrol (spring operated)
(3)
(3) Lengths vary depending on model, SG and rating, and should be verified.
Displacer + between 7.8 in. (195 mm) and 15 in. (383 mm)
Others - spring operated
(2)
Displacer+19.7 in. (500 mm)
Disc size Actual disc diameter
2 in. 1.8 in. (45 mm)
3 in. 2.7 in. (68 mm)
4 in. 3.6 in. (92 mm)
6 in. 5.55 in. (141 mm)
8 in. 7.40 in. (188 mm)
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