Emerson Rosemount 3051CF Series Reference Manual page 68

Hardware installation
July 2020
• Use impulse piping large enough to avoid friction effects and blockage.
• Vent all gas from liquid piping legs.
• When using a sealing fluid, fill both piping legs to the same level.
• When purging, make the purge connection close to the process taps and purge
through equal lengths of the same size pipe. Avoid purging through the transmitter.
• Keep corrosive or hot (above 250 °F [121 °C]) process material out of direct contact
with the sensor module and flanges.
• Prevent sediment deposits in the impulse piping.
• Maintain equal leg of head pressure on both legs of the impulse piping.
• Avoid conditions that might allow process fluid to freeze within the process flange.
3.5.3 Process connections
Coplanar or traditional process connections
Install and tighten all four flange bolts before applying pressure, or process leakage will
result. When properly installed, the flange bolts will protrude through the top of the
sensor module housing. Do not attempt to loosen or remove the flange bolts while the
transmitter is in service.
Flange adapters
Rosemount 3051DP and GP process connections on the transmitter flanges are ¼–18
NPT. Flange adapters are available with standard ½ –14 NPT Class 2 connections. The
flange adapters allow you to disconnect from the process by removing the flange adapter
bolts. Use plant-approved lubricant or sealant when making the process connections.
Refer to the Dimensional drawings section in the Rosemount 3051
see the distance between pressure connections. This distance may be varied ±¼-in. (6.4
mm) by rotating one or both of the flange adapters.
To install adapters to a coplanar flange, perform the following procedure:
Procedure
1. Remove the flange bolts.
2. Leaving the flange in place, move the adapters into position with the O-ring
3. Clamp the adapters and the coplanar flange to the transmitter sensor module using
4. Tighten the bolts. Refer to
Whenever you remove flanges or adapters, visually inspect the PTFE O-rings. Replace with
O-ring designed for the Rosemount transmitter if there are any signs of damage, such as
nicks or cuts. You may reuse undamaged O-rings. If you replace the O-rings, retorque the
flange bolts after installation to compensate for cold flow. Refer to the process sensor
body reassembly procedure in Troubleshooting.
68
installed.
the larger of the bolts supplied.
Flange bolts for torque specifications.
Reference Manual
00809-0100-4774
Product Data Sheet to
Rosemount 3051