INSTALLATION ST51A/ST75A/ST75AV Mass Flow Meters
10 Fluid Components International LLC
Retraction/Removal Procedure
1. Loosen the socket head cap screw on the side of the locking collar. See Figure 7 below.
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.
Figure 7 – Retractable Packing Gland Locking Collar Detail
2. Slowly loosen the packing nut until the insertion probe begins to retract. Use hands as needed to help control the retraction. 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.
PACKING NUT
LOOSEN THIS SCREW
LOCKING COLLAR
C01445-1-1
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