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Instruction Manual
Form 5729
March 2005
VENT
CONNECTION
73
(2.87)
G
F
A
NOTES:
1. F IS THE MEASUREMENT BETWEEN THE CENTERLINES OF THE SIDE
CONNECTIONS.
2. G IS THE MEASUREMENT FROM THE BOTTOM OF THE WAFER BODY TO
THE CENTERLINE OF THE UPPER SIDE CONNECTION, WHICH FOR STYLE 3
CAGES, IS THE TOP OF THE LINEAR PORTION OF THE DISPLACER.
3. THE SIDE CONNECTIONS CAN BE ANY PRACTICAL SIZE AND TYPE
(SCREWED, SOCKET WELD, OR FLANGED) AS LONG AS THEY CONFORM TO
ANSI CLASS 600 MAXIMUM PRESSURE RATING.
4. THE A DIMENSION SHOULD BE SUFFICIENT TO PROVIDE ADEQUATE
CLEARANCE FOR INSTALLATION, ACCESS TO ISOLATION VALVES, ETC.
E0727 / IL
Figure 8. Cage Dimensions for Style 3 Cage, Upper and Lower
Side Connections
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.
3- OR 4-INCH CLASS 150, 300,
OR 600 BLIND FLANGE
3- OR 4-INCH CLASS 150, 300,
OR 600 FLANGE
DRAIN
CONNECTION
(2.87)
G
F F
S4
mm
NOTES:
INCH
1. F IS THE OUTSIDE MEASUREMENT FROM THE CENTERLINE OF THE UPPER
SIDE CONNECTION TO THE BOTTOM CONNECTION. USE THIS DIMENSION FOR
FLANGED END CONNECTIONS, FOR SCREWED OR SOCKET WELD
CONNECTIONS, USE F
2. G IS THE MEASUREMENT FROM THE BOTTOM OF THE WAFER BODY TO
THE CENTERLINE OF THE UPPER SIDE CONNECTION, WHICH FOR STYLE 4
CAGES, IS THE TOP OF THE LINEAR PORTION OF THE DISPLACER.
E0729 / IL
Figure 9. Cage Dimensions for Style 4 Cage, Upper Side and
Mounting the Sensor on the Process
Vessel or Displacer Cage
If inserting the displacer into the
vessel or displacer cage before
attaching to the displacer rod, provide
a means of supporting the displacer to
prevent it from dropping into the
vessel or cage and suffering damage.
Install the sensor wafer body on the vessel or
displacer cage using the following procedure.
You may attach the displacer to the displacer rod
before installing the sensor on the cage or vessel. If
so attach the displacer to the displacer rod as
described in step 1. If the displacer diameter is small
enough, you may install a long or sectionalized
displacer through the wafer body after it is positioned
on the connecting flange. In this case, install the
displacer in step 4.
249W Level Sensor
VENT
3- OR 4-INCH CLASS 150, 300,
CONNECTION
OR 600 BLIND FLANGE
73
3- OR 4-INCH CLASS 150, 300,
OR 600 FLANGE
A
.
S4
Bottom Connections
CAUTION
mm
INCH
5
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