11 ST 800 Pressure Transmitter User’s Manual Revision 15
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.
Figure 8 – Using a Spirit Balance to Level a transmitter
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.
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