Re-Ranging a HART Transmitter

If you could, the accuracy would make it pratically useless. If it was ±1%FS (at 10,000psi), that's ±100psi (which would still apply on the 300psi range).

Select a more suitable instrument for the new task.

It depends on the brand and model. The range over which the scale can be manipulated is referred to 'turn-down' in conversation, rarely on the spec sheets.

One major brand can range its scale from 0-400" (1000mbar) all the way down to 0-10"w.c. (25mbar); a 40:1 turndown.

The zero elevation and suppression can be across the entire spanned range, to my knowledge (I haven't run into a HART device that limited zero elevation and suppression)

The uncertainty (accuracy spec) might have two calculation formulas. One for a high range span and a separate formula for a low range span. In that case, there's a defined transition point (like 50"w.c. [125mbar]) for the unit referenced above.

Get the spec sheet for you brand/model and see what it says.

With the high turndowns available on smart transmitters today, it wouldn't surprise me if you can do what your propose.

The spec sheet at my finger tips says that this brand's 10,000 psig max transmitter has a 100:1 turndown, which would be a minimum URV of 100psig.