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Reference Manual
00809-0100-4514, Rev BA
January 2008
Rosemount 1154
2-2
Figure 2-1. Qualified
Life vs. Ambient Temperature.
MECHANICAL
CONSIDERATIONS
This section contains information you should consider when preparing to
mount the transmitter. Read this section carefully before proceeding to the
mechanical installation procedure.
Mount the Rosemount 1154 transmitter to a rigid support (a support with a
fundamental mechanical resonant frequency of 40 Hz or greater). A mounting
bracket included with the transmitter facilitates panel mounting. Figure 2-4 on
page 2-6 shows the qualified mounting configurations. The transmitter was
seismic qualified with the bracket mounted with four
3
/8-in. diameter bolts.
Orientation with respect to gravity is not critical to qualification. However, if the
transmitter is mounted with the flanges in a horizontal position, zero the
transmitter to cancel the liquid head effect caused by the difference in height
of the process connections.
If the transmitter is mounted to a non-rigid panel, the user must ensure that
seismic input to the mounting bracket does not exceed qualification levels
given in Rosemount Report D8400102.
Process Connections Process tubing installation must prevent any added mechanical stress on the
transmitter under seismic disturbances. This may be done by using
stress-relief loops in the process tubing or by separately supporting the
process tubing close to the transmitter.
The process connections to the transmitter flanges were qualified with
3
/8-in.
tubing using Swagelok
®
compression fittings. For options using
1
/4–18 NPT
connections, the user assumes responsibility for qualifying the interface.
The Swagelok tube fittings are shipped completely assembled for immediate
use. Do not disassemble them before use; doing so may contaminate the
fittings and result in leaks. Insert the tubing into the Swagelok tube fitting,
making sure that the tubing rests firmly on the shoulder of the fitting and that
the nut is finger tight. Tighten the nut one-and-one-quarter turns past finger
tight to prepare the transmitter for use. Do not overtighten.
Electronics
Qualified Life
Temperature (°F)
Time (Years)
Module
Qualified
Life