Emerson Rosemount 2051, Справочное руководство

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44
Reference Manual
00809-0100-4107, Rev BA
Section 3: Hardware Installation
April 2013
Hardware Installation
The best location for the transmitter in relation to the process pipe is dependent on the process.
Use the following guidelines to determine transmitter location and placement of impulse
piping:

Keep impulse piping as short as possible.

For liquid service, slope the impulse piping at least 1 in./foot (8 cm/m) upward from the
transmitter toward the process connection.

For gas service, slope the impulse piping at least 1 in./foot (8 cm/m) downward from
the transmitter toward the process connection.

Avoid high points in liquid lines and low points in gas lines.

Make sure both impulse legs are the same temperature.

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.
3.4.3 Process connections
Coplanar or traditional process connection
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 adaptors:
Rosemount 2051DP and GP process connections on the transmitter flanges are
1
/
4
–18 NPT.
Flange adapters are available with standard 1 /
2
–14 NPT Class 2 connections. The flange adapters
allow users to disconnect from the process by removing the flange adapter bolts. Use
plant-approved lubricant or sealant when making the process connections. Refer to
Dimensional Drawings on
page 113 for the distance between pressure connections. This
distance may be varied ± 1 /
4
in. (6.4 mm) by rotating one or both of the flange adapters.
To install adapters to a Coplanar flange, perform the following procedure:
1. Remove the flange bolts.
2. Leaving the flange in place, move the adapters into position with the o-ring installed.
3. Clamp the adapters and the Coplanar flange to the transmitter sensor module using the
larger of the bolts supplied.
4. Tighten the bolts. Refer to “Flange bolts” on page 36 for torque specifications.