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5 Doc. No. 06EN003367 Rev. E
ST50 Mass Flow Meter Fluid Components International LLC
5. Tighten the packing nut until the internal packing is tight enough to prevent excess process leakage, but also allow the
insertion probe to be inserted into place. For ball valve applications, open the ball valve after the packing nut has been
tightened.
Caution: For applications where the process media is pressurized to greater than 232 psig [16 bar(g)] make sure to first
depressurize the process line before making the insertion.
6. Align the orientation flat and flow arrow parallel to the flow direction and proceed to insert the flow element into the process
media pipe up to the insertion depth mark.
7. Tighten the packing nut another ½ to 1 turn tight (approximately 20 ft-lbs) until the packing has created a full seal.
8. Ensure the locking collar is properly secured to the back of the packing gland. Torque the two No. 8-32 socket head cap
screws on the locking collar to 20 in-lbs using a 9/64" hex key.
Retraction/Removal Procedure
1. Loosen the socket head cap screw on the side of the locking collar. See Figure F below.
Figure F
PACKING NU
LOOSEN THIS SCREW
LOCKING COLLA
C01445-1-1
Caution: For applications where the process media is pressurized to greater than 232 psig [16 bar(g)] make sure to first
depressurize the process line before retracting the flow element. At 232 psig [16 bar(g)], the effective force on the insertion
probe is 45.5 lbs (20.6 kg), which is the limit at which the flow element can be safely guided by hand. When using hands
to restrain the retraction, be prepared for a rapid pressure impulse of the flow element. Make sure that there are no objects
directly behind the flow element as the insertion probe may retract very quickly.
2. Slowly loosen the packing nut until the insertion probe begins to retract. Use hands as needed to help control the retrac-
tion. If the probe does not begin to retract itself, gently shake and pull the insertion probe until the flow element has been
fully retracted into the packing gland.
3. For ball valve applications, close the ball valve immediately after retraction to seal off the process. After closing the ball
valve it is then safe to remove the flow element from the back end of the ball valve. If a ball valve is not being used, make
sure to first depressurize the process line before removing the flow element.
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