Emerson 00809-0100-4514, 1154 manual Mechanical Considerations, Process Connections

	Reference Manual
Rosemount 1154	00809-0100-4514, Rev BA
	January 2008
Figure 2-1. Qualified
Life vs. Ambient Temperature.
	Module
	Qualified
	Life
	Electronics
	Qualified Life
	Time (Years)
	Temperature (°F)

MECHANICAL CONSIDERATIONS

Process Connections

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 2-6shows 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 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.

2-2