Type 2500
Instruction Manual
Form 1013
December 2005
7
Figure 4. Cage Head Mounting Positions
AH9150
−
A
A2613
−
2/IL
Mounting Caged Sensor
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.
Note
If the controller/transmitter is not
mounted on the sensor, refer to the
Installing Controller/Transmitter on
Sensor procedures in the Maintenance
section. This section also provides
instructions for adding a heat insulator
to a unit.
Figure 5. Cage Connection Styles
A1271
−
2/IL
Cage connections normally are either 1-1/2 or
2-inch, screwed or flanged. Figure 5 shows the
combinations. With flanged connections, use
standard gaskets or other flat-sheet gaskets
compatible with the process fluid. Spiral-wound
gaskets without compression-controlling centering
rings cannot be used for flange connections.
As shown in figure 6, mount the cage by running
equalizing lines between the cage connections and
the vessel. A shutoff or hand valve with a 1-1/2 inch
diameter or larger port should be installed in each of
the equalizing lines. Also install a drain between the
cage and shutoff or hand valve whenever the bottom
cage line has a fluid-trapping low point.
On fluid or interface level applications, position the
sensor so that the center line on the cage (see figure
6) is as close as possible to the center of the fluid
level or interface level range being measured. Also
consider installing a gauge glass on the vessel, or
on the sensor cage (if the cage is tapped for a
gauge).
