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3.4.4 Mounting transmitters with Small Absolute or Differential Pressure Spans
To minimize positional effects on calibration (zero shift), take the appropriate
mounting precautions for the respective transmitter model. For a model STA822 or
STA82L, ensure that the transmitter is vertical when mounting it. You do this by leveling
the transmitter side-to-side and front-to-back. Figure 8 shows how to level a transmitter
using a spirit level.
3.4.5 Flange Mounting
Figure 9 shows a typical tank-flange mount installation, with the transmitter flange mounted to the pipe
on the wall of the tank.
On insulated tanks, remove enough insulation to accommodate the flange extension.
When flange-mounting to a tank, note the following:
•
The End User is responsible for providing a flange gasket and mounting hardware suitable for the
transmitter service conditions.
•
To avoid degrading performance in flush-mounted flanged transmitters, exercise care to ensure
that the internal diameter of the flange gasket does not obstruct the sensing diaphragm.
•
To prevent performance degradation in extended-mount flanged transmitters, ensure that
sufficient clearance exists in front of the sensing diaphragm body.
11
Figure 8 – Using a Spirit Balance to Level a transmitter
ST 800 Pressure Transmitter User's Manual
Revision 15
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