Reference Manual
00809-0100-4716, Rev JA
May 2008
2-7
Rosemount 3095 MultiVariable
The best location for the transmitter in relation to the process pipe depends on
the process. Consider the following guidelines in determining transmitter
location and placement of impulse piping:
• Keep impulse piping as short as possible.
• Slope the impulse piping at least one inch per foot (8 centimeters per
meter) upward from the transmitter toward the process connection for
liquid.
• Slope the impulse piping at least one inch per foot (8 centimeters per
meter) downward from the transmitter toward the process connection
for gas.
• 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 prevent
blockage.
• Vent all gas from liquid piping legs.
• When using a sealing fluid, fill both piping legs to the same level.
• When purging is necessary, 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.
• Keep the liquid head balanced on both legs of the impulse piping.
• Avoid conditions that might allow process fluid to freeze within the
process flange.
NOTE
For steam service, do not blow down impulse piping through the transmitter.
Flush the lines with the blocking valves closed and refill the lines with water
before resuming measurement.
Environmental Mount the transmitter to minimize ambient temperature changes.
“Specifications” on page A-1 lists the transmitter temperature operating limits.
Mount the transmitter to avoid vibration and mechanical shock, and to avoid
external contact with corrosive materials.
Access Requirements When choosing an installation location and position, take into account the
need for access to the transmitter.
Process Flange Orientation
The process flanges must be oriented so that process connections can be
made. In addition, consider the possible need for a testing or calibration
input.
Drain/vent valves must be oriented so that process fluid is directed away from
technicians when the valves are used.
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