96
Reference Manual
00809-0100-4772, Rev FA
Troubleshooting
March 2016
Troubleshooting
7.5.5 Replacing the sensor: removable and integral support
tubes
The following procedure applies to flowmeters equipped with a removable support tube.
Note
Sensor cavity could contain line pressure if an abnormal failure has occurred inside the
meter body. See “Safety messages” on page 81 on for complete warning information.
1. If the meterbody is not a CriticalProcess™ Vortex (CPA Option) proceed to step 6.
2. Welded onto the side of the meter body is a valve. Move any nearby equipment
from the line of sight of the valve tube, if possible. Protect other equipment with
shielding, cover or other type of protection.
3. Position all personnel away from the line of sight of the valve tube.
Note
There are numerous tube fittings that could connect to the tube if there is a need to drain
away process material. The tube on the valve has a
3
/16-in. OD with a 0.035” wall thickness.
4. Using a
7
/16-in. (11-mm) open end wrench, slowly loosen the valve nut. Back out the
nut until it stops. There is a set screw which prevents the nut from being completely
removed.
5. Process fluid venting from the valve tube indicates that there is process fluid in the
sensor cavity.
a. If there is no process fluid in the sensor cavity, continue to Step 7.
b. If there is process fluid in the sensor cavity, immediately re-tighten the
valve nut until process fluid stops venting. Do NOT tighten any further.
STOP and contact your Rosemount Sales Representative. The meterbody
will need to be replaced.
6. De-pressurize the flow line.
7. Remove the electronics housing (see “Replacing the F
OUNDATION Fieldbus
electronics housing” on page 93).
8. Loosen the four support tube anchor bolts with a
7
/16-in. open end wrench. See
Figure 7-10.
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