Emerson Rosemount 2051 Wireless Series Reference Manual page 199

Section 6: Troubleshooting
June 2012
Note
If you are replacing the o-rings, be careful not to scratch the o-ring grooves or the surface of the
isolating diaphragm when removing the damaged o-rings.
2.
a.
b. Coplanar Process Flange with Flange Adapters:
c.
3.
4.
Table 6-4. Bolt installation torque values
Bolt material
CS-ASTM-A445 Standard
316 SST—Option L4
ASTM-A-19 B7M—Option L5
ASTM-A-193 Class 2, Grade B8M—Option L8
Note
If you replaced the PTFE sensor module o-rings, re-torque the flange bolts after installation to
compensate for cold flow.
Note
For Range 1 transmitters: after replacing o-rings and re-installing the process flange, expose the
transmitter to a temperature of 185 °F (85 °C) for two hours. Then re-tighten the flange bolts in
a cross pattern, and again expose the transmitter to a temperature of 185 °F (85 °C) for two
hours before calibration.
See "Safety Messages" on page 67
76
Install the process connection. Possible options include:
Coplanar Process Flange:
– Hold the process flange in place by installing the two alignment screws to
finger tightness (screws are not pressure retaining). Do not overtighten as this
will affect module-to-flange alignment.
– Install the four 1.75-in. flange bolts by finger tightening them to the flange.
– Hold the process flange in place by installing the two alignment screws to
finger tightness (screws are not pressure retaining). Do not overtighten as this
will affect module-to-flange alignment.
– Hold the flange adapters and adapter o-rings in place while installing (in the
desired of the four possible process connection spacing configurations) using
four 2.88-inch bolts to mount securely to the coplanar flange. For gage
pressure configurations, use two 2.88-inch bolts and two 1.75-inch bolts
Manifold:
– Contact the manifold manufacturer for the appropriate bolts and procedures.
Tighten the bolts to the initial torque value using a crossed pattern. See
page 6-76 for appropriate torque values.
Using same cross pattern, tighten bolts to final torque values seen in
page 6-76.
Initial torque value
for complete warning
300 in-lb. (34 N-m)
150 in-lb. (17 N-m)
300 in-lb. (34 N-m)
150 in.-lb (17 N-m)
Reference Manual
00809-0100-4100, Rev AA
Table 6-4 on
Table 6-4 on
Final torque value
650 in-lb. (73 N-m)
300 in-lb. (34 N-m)
650 in-lb. (73 N-m)
300 in.-lb (34 N-m)
Troubleshooting