Leveling Transmitters With Small Absolute Or Differential Pressure Spans; Figure 5: Using Level To Mount Transmitter - Honeywell ST 800 Quick Start Installation Manual

SmartLine Pressure Transmitter
Leveling Transmitters with Small Absolute or Differential
Pressure Spans
Mounting position of these transmitters is critical due to the smaller transmitter spans.
To minimize these positional effects on calibration (zero shift), take the appropriate
mounting precautions that follow for the given transmitter model.
See Figure 5 for suggestions on how to level the transmitter using a spirit balance.
To perform a Zero Trim after leveling, refer to Trim the Transmitter on page 16.

Figure 5: Using level to mount transmitter

For model STA840, STA822, STA740 or STA722 transmitters, you must ensure that
the transmitter is vertical when mounting it. You do this by leveling the transmitter
side-to-side and front-to-back.
Mount transmitter vertically to assure best accuracy. Position the spirit balance on the
pressure connection surface of AP body.
December 2016 Quick Start Installation Guide 7