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Reference Manual
00809-0100-4302, Rev BA
January 2008
Rosemount 1153 Series B
2-4
The piping between the process and the transmitter must transfer the
pressure measured at the process taps to the transmitter. Possible sources of
error in this pressure transfer are:
•
Leaks
•
Friction loss (particularly if purging is used)
•
Trapped gas in a liquid line or trapped liquid in a gas line (head error)
•
Temperature-induced density variation between legs (head error), for
differential transmitters
To minimize the possibility of errors, take the following precautions:
•
Make impulse tubing as short as possible.
•
Slope tubing at least one inch per foot up toward the process
connections for liquid and steam.
•
Slope tubing at least one inch per foot down toward the process
connections for gas.
•
Avoid high points in liquid lines and low points in gas lines.
•
Use impulse tubing of sufficient diameter to avoid friction effects.
•
Ensure that all gas is vented from liquid tubing legs.
•
Ensure that impulse tubing is of adequate strength to be compatible
with anticipated pressures.
For differential transmitters, also consider the following:
•
Keep both impulse legs at the same temperature.
•
When using 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 tubing. Avoid purging
through the transmitter.
Conduit
The conduit connection to the transmitter is
1
/
2
–14 NPT. Two hubs are
available on the transmitter for convenient installation. Close off the unused
hub with a stainless steel
1
/
2
–14 NPT pipe plug and seal all threads with a pipe
thread sealant. Use a qualified conduit seal at the conduit entry to prevent
moisture from accumulating in the terminal side of the housing during
accident conditions. To prevent the conduit from adding mechanical stress to
the transmitter during seismic disturbances, use flexible conduit or support
the conduit near the transmitter. Install the conduit seal in accordance with the
manufacturer’s instructions or use the procedure on page 2-10.
ELECTRICAL
CONSIDERATIONS
This section contains information that you should consider when preparing to
make electrical connections to the transmitter. Read this section carefully
before proceeding to the electrical installation procedures.
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