Emerson Rosemount 2051 Wireless Series, Reference Manual, Page: 57 / 250

70
Reference Manual
00809-0100-4102, Rev AA
Section 6: Troubleshooting
June 2012
Troubleshooting
Table 6-4. Bolt Installation
Torque Values
4. If you replaced the Teflon sensor module o-rings, re-torque the flange bolts after
installation to compensate for cold flow.
5. Install the drain/vent valve.
a. Apply sealing tape to the threads on the seat. Starting at the base of the valve with the
threaded end pointing toward the installer, apply two clockwise turns of sealing tape.
b. Take care to place the opening on the valve so that process fluid will drain toward the
ground and away from human contact when the valve is opened.
c. Tighten the drain/vent valve to 250 in-lb. (28.25 N-m).
Note
After replacing o-rings on Range 1 transmitters 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.
Bolt Material Initial Torque Value Final Torque Value
CS-ASTM-A445 Standard 300 in-lb. (34 N-m) 650 in-lb. (73 N-m)
316 SST—Option L4 150 in-lb. (17 N-m) 300 in-lb. (34 N-m)
ASTM-A-193-B7M—Option
L5
300 in-lb. (34 N-m) 650 in-lb. (73 N-m)
Alloy K-500—Option L6 300 in-lb. (34 N-m) 650 in-lb. (73 N-m)
ASTM-A-453-660—Option
L7
150 in-lb. (17 N-m) 300 in-lb. (34 N-m)
ASTM-A-193-B8M—Option
L8
150 in-lb. (17 N-m) 300 in-lb. (34 N-m)