Replacing The Sensor: Removable And Integral Support Tubes - Emerson Rosemount 8800D Series Reference Manual

Troubleshooting
March 2016
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
1.
2.
3.
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
4.
5.
6.
7.
8.
96
www.aotewell.com
"Safety messages" on page 81
If the meterbody is not a CriticalProcess™ Vortex (CPA Option) proceed to step 6.
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.
Position all personnel away from the line of sight of the valve tube.
Using a / -in. (11-mm) open end wrench, slowly loosen the valve nut. Back out the
7
16
nut until it stops. There is a set screw which prevents the nut from being completely
removed.
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
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.
De-pressurize the flow line.
Remove the electronics housing (see
electronics housing" on page
Loosen the four support tube anchor bolts with a
Figure 7-10.
sales@aotewell.com
on for complete warning information.
/ -in. OD with a 0.035" wall thickness.
3
16
"Replacing the F
OUNDATION
93).
/ -in. open end wrench. See
7
16
Industry Automation
Reference Manual
00809-0100-4772, Rev FA
Step 7.
Fieldbus
Troubleshooting
+86-755-8660-6182