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Reference Manual
00809-0200-4101, Rev AA
July 2008
Rosemount 2051
5-12
a. 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.
b. Coplanar Process Flange with Flange Adapters:
• 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
the four configurations, use four 2.88-in. bolts. For gage pressure
configurations, use two 2.88-in. bolts and two 1.75-in. bolts.
c. Manifold:
• Contact the manifold manufacturer for the appropriate bolts and
procedures.
3. Tighten the bolts to the initial torque value using a crossed pattern. See
Table 5-11 for appropriate torque values.
Table 5-11. Bolt Installation
Torque Values
NOTE
If you replaced the PTFE sensor module o-rings, re-torque the flange bolts
after installation to compensate for cold flow.
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.
Install the Drain/Vent
Valve
1. 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.
2. Tighten the drain/vent valve to 250 in-lb. (28.25 N-m).
3. 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.
Bolt Material Initial Torque Value Final Torque Value
CS-ASTM-A449 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)
ASTM-A-193 Class 2, Grade
B8M—Option L8
150 in.-lb (17 N-m) 300 in.-lb (34 N-m)