Rosemount 1151GP - General Considerations; Transmitter Access Requirements

Reference Manual
00809-0100-4360, Rev BA
August 2008
Rosemount 1151
2-4
GENERAL
CONSIDERATIONS
The accuracy of a flow, pressure, or level measurement depends on proper
installation of the transmitter and impulse piping. The piping between the
process and transmitter must accurately transmit process pressure to the
transmitter. Mount the transmitter close to the process and use a minimum of
piping to achieve best accuracy. However, keep in mind the need for easy
access, safety of personnel, practical field calibration, and a suitable
transmitter environment.
In general, install the transmitter so as to minimize vibration, shock, and
temperature fluctuations.
Installations in food, beverage, and pharmaceutical processes may require
sanitary seals and fittings. Regulations may dictate special installation
requirements to maintain sanitation and cleanability. See
www.emersonprocess.com for more information about sanitary pressure
instruments.
Transmitter Access
Requirements
When choosing an installation location and position, take into account the
need for access to the transmitter.
Process Flange Orientation
Orient the process flanges to enable process connections to be made. For
safety reasons, orient the drain/vent valves so that process fluid is directed
down and away from technicians when the valves are used. This can be
accomplished by pointing the hole in the outside valve body downward and
away.
Housing Rotation
The electronics housing is designed to be rotated up to 90 degrees in order to
provide field access to the two housing compartments. (If rotating the housing
more than 90 degrees is necessary, follow the transmitter disassembly
procedures in Section 5: Troubleshooting.) To rotate the housing up to 90
degrees, loosen the housing lock nut and turn the housing not more than 90
degrees.
NOTE
Seal module threads with Loctite
®
222 before retightening housing lock nut
(see Connecting the Electrical Housing to the Sensor on page 5-7.)
Terminal Side of
Electronics Housing
The terminal side is marked on the nameplate located on the side of the
transmitter. Mount the transmitter so that the terminal side of the housing is
accessible by providing:
•A
3
/4-inch clearance for cover removal with no meter
• A 3-inch clearance for cover removal with a meter installed
Do not rotate the transmitter housing more than 90 degrees without disconnecting the
header board. Exceeding 90 degrees rotation will damage the internal sensor module
wiring.