If I use digital bus signal transmission, what is the recommended type of transmitter?
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If pneumatic output signal transmission is used, the transmitter should have:
The transmitter should be provided with zero and span adjudtment which should be accessible without the removal of a dedicated cover.
The zero output should be adjustable as a minimum to +/- 15% of the upper range limit.
Fieldbus Foundation or Profibis is the preferred transmitter.
Also, if 4-20mA output signal is used, it should be protected from reversal of normal supply voltage.
The transmitter should also