249W Level Sensor
Instruction Manual
Form 5729
May 2006
5
dimensions for Type 249W sensor and DLC3000
Series controller, and figure 8 provides overall
envelope dimensions for Type 249W and 2500
Series controller or transmitter.
When fabricating the cage, maintain a minimum
clearance of 1/4-inch between the displacer and the
cage wall. Dirty or viscous fluids may require a larger
clearance. Provide sufficient cage length below the
displacer to ensure that the displacer does not hit
the bottom of the cage. The A dimension should be
sufficient to permit adequate clearance for
installation and to allow access to isolation valves,
etc. When installing the cage, it must be vertically
plumb so that the displacer does not strike the side
of the cage.
As shown in figure 5, 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 displacer
cage so that the cage center 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 displacer cage.
