Rosemount 1151GP - Mounting Considerations

Reference Manual
00809-0100-4360, Rev BA
August 2008
Rosemount 1151
2-8
MOUNTING
CONSIDERATIONS
The Rosemount 1151 Pressure Transmitter weighs 12 lb. (5.4 kg) without a
meter and 15 lb. (6.8 kg) with a meter. This weight must be securely
supported. The transmitter is calibrated in an upright position at the factory. If
this orientation is changed during mounting, the zero point will shift by an
amount equivalent to the liquid head caused by the mounting position. For
Smart Transmitters, follow “Because a zero trim must be zero-based, it
generally should not be used with Rosemount 1151 Smart Absolute Pressure
Transmitters. Absolute pressure transmitters reference absolute zero. To
correct mounting position effects on a Rosemount 1151 Smart Absolute
Pressure Transmitter, perform a low trim within the full sensor trim function.
The low trim function provides a “zero” correction similar to the zero trim
function but it does not require the input to be zero based.” on page 4-5 to
correct this shift. For Analog Transmitters, follow “Zero and Span Adjustment”
on page 4-15 to correct this shift.
NOTE
Do not plug the low side with a solid plug. Plugging the low side will cause an
output shift.
Mounting Requirements
(for Steam, Liquid, Gas)
The following information applies to steam, liquid, and gas installations.
Taps
Tap placement is dependent on the type of process being measured, and on
whether the transmitter has side drain/vent valves:
• For liquid flow measurement, place taps to the side of the line to
prevent sediment deposits, and mount the transmitter beside or below
these taps so gases can vent into the process line and away from the
transmitter.
• For gas flow measurement, place taps in the top or side of the line and
mount the transmitter beside or above the taps so liquid will drain away
from the transmitter.
• For steam flow measurement, place taps to the side of the line with the
transmitter mounted below them to ensure that the impulse piping stays
filled with condensate.
• For transmitters with side drain/vent valves, place taps to the side of
the line.
See Figure 2-4 for a diagram of these arrangements.