249W Level Sensor
Instruction Manual
Form 5729
May 2006
4
CAGE WITH TOP AND BOTTOM CONNECTIONS
CAGE WITH SIDE CONNECTIONS
W8268 / IL
W8267 / IL
Figure 5. Type 249W Sensor Cage-Mounted on Side of Vessel
side of the vessel as shown in figure 5. The sensor
mounts on the top of the vessel or in the displacer
cage using a 3-inch raised face flange with the
3-inch 249W wafer body, or a 4-inch raised-face
flange with the 4-inch 249W wafer body.
Installation on Top of Vessel
Note
If a stillwell is used, install it plumb so
that the displacer does not touch the
wall of the stillwell. If the displacer
touches the wall, the unit will transmit
an erroneous output signal.
Because the displacer hangs inside the vessel,
provide a stillwell around the displacer if the fluid is
in a state of continuous agitation to avoid excessive
turbulence around the displacer.
To attach the sensor body to the vessel requires a
flanged connection on the vessel as shown in figure
4. For interface or fluid level applications, install a
gauge glass on the vessel.
Installation with Displacer Cage on
Side of Vessel
Note
Install the cage so that it is plumb; the
displacer must not touch the cage
wall. If the displacer touches the cage
wall, the unit will transmit an
erroneous output signal.
Figure 5 shows the Type 249W sensor mounted on
the side of a vessel using a displacer cage. Figure 6
provides the Type 249W dimensions required to
fabricate a cage. Figure 7 provides overall envelope
