Fluid Components International LLC
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4
Doc. No. 06EN003367 Rev. E
ST50 Mass Flow Meter
To assist in final installation, FCI suggests making a readable mark on the extension pipe to indicate the final desired compression
fitting position that will place the element at the centerline reference once the system is tightened down into place. With the compres-
sion fitting lightly tightened, hold the element assembly along the outside of the installation, or directly above, to visually verify the
compression fitting location will ensure centerline installation. To calculate the actual “U” length dimension, take the inside diameter
of the pipe or duct divide by 2, then add 0.50", then add for the pipe wall thickness and the process fitting offset that allows the
compression fitting to securely seat in the process port. See Figure D above.
Align the flat parallel to flow and adjust the instrument depth. Upon determination of the final compression fitting location on the
extension pipe, apply the proper thread sealant to the NPT threads, firmly tighten the compression fitting into the mating process
connection. Torque varies per application. Tighten the compression nut to the torque indicated with the corresponding ferrule
material. Manufacturer recommends 1-1/4 turns from hand tight baseline.
Ferrule Torque
Teflon
65 in – lbs
316 SST
65 ft – lbs
Retractable Packing Gland Mounting
A retractable packing gland, with ½" MNPT or ¾" MNPT threads and graphite or Teflon packing, is a process connection option. FCI
single point flow meters are calibrated at the centerline of the process pipe. The flow element is properly mounted when the tip of the
flow element is located .50 inches (13 mm) past the pipe centerline. Follow the below steps to install/retract instruments with the
retractable packing gland option.
1. The scale etched on the side of the insertion probe indicates the length to the tip of the flow element. Calculate the insertion
depth using the equation, variables, and Figure E below.
2. Mark the insertion pipe at the calculated insertion depth.
3.
Ball Valve Applications Only
: If a ball valve is required, install the ball valve to the process mounting coupling. Close the ball
valve to prevent the process media from leaking out when installing the packing gland with the process line pressurized.
4. Apply the proper thread sealant compatible with the process media to the male threads of the packing gland. Fully retract the
insertion probe into the cavity of the packing gland and install the packing gland into the process mounting coupling or ball
valve.
If a ball valve is not used, make sure to first depressurize the process line before installing
.
ID
= Inside Diameter of Pipe
T
= Pipe Wall Thickness
C
= Mounting Coupling with Optional Ball Valve and Installed Packing Gland Length
INSERTION DEPTH = ______________
Figure E
C01444-1-1
CL
LOCKING COLLAR
PACKING NUT
MARK
INSERTION
DEPTH
OPTIONAL BALL VALVE:
CUSTOMER-SUPPLIED OR
PURCHASED FROM FCI
Figure E
