Yokogawa digitalYEWFLO (DY) - Manual (Page 75)

MAINTENANCE
IM 1F2B4-01-YIA
Page 79
Figure 4.4.1: Vortex Shedder Bar Orientation
For high temperature assemblies (option /HPT), first tighten the bolts with a torque wrench applying
the A value. Next, completely loosen all the bolts and retighten with a torque wrench this time using
the B value.
5) Insert the sensor wires through the bottom hole of the terminal box. Slowly lower the
terminal box until the bracket touches the flowmeter shoulder. Be sure to keep the sensor
wires vertical while lowering the terminal box.
6) After assembly, confirm that there is no leakage.
4.4.1 YEWFLO shedder bolt torque procedure
Table 4.4.1 summarizes the torque values which should be used when reinstalling a shedder bar in
any YEWFLO Vortex meter. When reading this table, please keep the following in mind:
1) Use the TEFLON COATED GASKET table for all meters with teflon-coated gaskets.
2) Use the SILVER PLATED GASKET tables for all meters with silver-coated gaskets
regardless of whether they have a high-temperature sensor.
3) For meters with four bolts, tighten alternate bolts to produce an even compression of the
gasket.
4) Enter the appropriate table using the meter size. Tighten all bolts to the value shown in the
first column. When finished, tighten all bolts to the value shown in the second column.
Continue this procedure until all bolts are tightened to the highest torque value.
5) For meters with silver-coated gaskets, begin by using the table labeled 1st round. When
complete, unscrew all attachment bolts until the gasket compression plate is loose. Retighten
all bolts using the values shown in the table marked 2nd round. Notice that some torque
values are less for the second tightening sequence than for the first.