97
Reference Manual
00809-0100-4772, Rev FA
Troubleshooting
March 2016
Troubleshooting
Figure 7-10. Removable Support Tube Assembly
A. Removable support tube
B. Sensor nut
C. Sensor
D. Meter body
E. Anchor bolts
9. Remove the support tube.
10. Loosen and remove the sensor nut from the sensor cavity with a 1
1
/8-inch (28-mm)
open end wrench. (Use a
3
/4-in. (19-mm) open end wrench for 3- and 4-in. (80 and
100 mm) SST wafers.)
11. Lift the sensor from the sensor cavity. Be very careful to lift the sensor straight up.
Do not rock, twist, or tilt the sensor during removal; this will damage the
engagement diaphragm.
12. If the CriticalProcess
™
Vortex flowmeter (CPA) option is present, tighten the valve
to ensure it is closed after the new Vortex sensor is installed. It is recommended
that the nut be torqued to 50 in-lbs (5.7 N-m). Over tightening the valve nut could
compromise its ability to seal.
Cleaning the sealing surface
Before installing a sensor in the meter body, clean the sealing surface by completing the
following procedure. The metal o-ring on the sensor is used to seal the sensor cavity in the
event that process fluid should corrode through the meter body and enter the sensor cavity.
Be sure not to scratch or otherwise damage any part of the sensor, sensor cavity, or sensor
nut threads. Damage to these parts may require replacement of the sensor or meter body,
or may compromise the safety of the sealing surfaces.
Note
If you are installing a sensor that has been used before, clean the metal o-ring on the sensor
using the following procedure. If you are installing a newly purchased sensor, cleaning the
O-ring is not necessary.
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