Fluid Components International FLT Series Rack Mount - Manual (Page 55)

FLUID COMPONENTS INTL CHAPTER 2 - INSTALLATION
FLT  Series FlexSwitch  Rack Mount 2 - 2 Doc. No. 06EN003250 Rev. N/C
Verify Flow Direction and Placement Orientation for the Sensing Element (Flow
Application)
For flow detection, the sensing element surface marked with direction arrows should be oriented parallel to the
process flow . The flow can be from either direction. See the appropriate figure in Appendix A for the flow arrow
marking.
For liquid flow service, the sensing element should be located in the process pipe so that the thermowells are always
completely wet.
When mounted in a tee or section of pipe larger than the normal process pipe, position in a vertical run of pipe with
flow upward. This will prevent air or gas bubbles from becoming trapped at the sensor assembly.
Vertical positioning with flow downward is only recommended for higher flow rate applications (consult FCI).
Verify Flow Direction and Placement Orientation for the Sensing Element (Level
Application)
If the sensing element is side-mounted on the process vessel, then the surface marked with direction arrows should be
vertically oriented.
If the sensing element is top- or bottom-mounted on the process vessel, the orientation of the surface marked with
direction arrows does not matter.
Install the Sensing Element
Male NPT Mounting
When mounting the sensing element to the process pipe, it is important that a lubricant/sealant be applied to the male
threads of all connections. Be sure to use a lubricant/sealant compatible with the process environment. All
connections should be tightened firmly. To avoid leaks, do not overtighten or cross-thread connections. See the
appropriate figure in Appendix A for mounting dimensions.
Flange Mounting
For flange mounted sensing elements, attach the process mating flange with care. The correct orientation of the
sensing element must be maintained to ensure optimum performance or calibration. See drawings in Appendix A.
Packing Gland Assembly
Applications involving the use of a packing gland (low or medium pressure) should refer to the drawings in
Appendix A for additional detail.
1. Threaded or flanged packing gland mounts are available. The valve assembly with appropriate connections are
customer supplied. Follow the male NPT mounting procedure above to attach the pipe thread portion or flange
mounting portion as applicable.
2. Tighten the packing nut until the internal packing is tight enough so that the friction fit on the shaft is adequate
to prevent leakage but not prevent the shaft from sliding. Position the etched flow arrow parallel with the flow
(
±1
°of level) and position the flow arrow so it is pointing in the direction of the flow.
3. Proceed to insert the probe into the process media line. Use the adjusting nuts on the all-thread to pull the
sensing element into proper predetermined depth position.
4. Tighten the opposing lock nuts on the all-threads. Tighten the packing nut another half to full turn until tight
(approximately 65 to 85 ft/lbs [88 to 115 N•m] torque).
5. Rotate the split ring locking collar to line up with the connecting strap welded to the packing nut. Tighten the
two 1/4-28 hex socket cap screws on the split ring locking collar.
Reverse these steps for removal.