can a pressure transmitter with span limit 0.06-6 Bar measure -1 to +1 Bar?

 

What is the meaning of minus 1 bar (this is vacuum?????) especially minus 1 bar is perfect vacuum which is as far as i know impossible to get with actual technology, in other word can you clarify your request?

> can a pressure transmitter with span limit 0.06-6 Bar measure -1 to +1 Bar?

 

What is referred to as a 'span limit' of 0.06 - 6 bar probably reflects the span "turndown" of a smart gauge pressure transmitter, with the narrowest/smallest span being 0.06 bar (0 to 0.06 or 0.50 to 0.56 bar) and the widest span being 6.0 bar. 0.06/6.0 is a 100:1 turndown.

Most gauge pressure transmitters can be used in the vacuum range, although one major manufacturer requires a "compound characterization" option for the unit to meet its accuracy spec. And the span does not go to absolute zero, it is some negative gauge pressure value slightly above absolute zero.

Typically a compound range is doable where the span includes both the negative and positive ranges, for instance -0.5 to 0.5 bar would be a 1.0 bar span.

Somewhere on the spec sheet there's a note as to the minimum vacuum that falls within the transmitter's measurement range, so minimum negative gauge values are something less than one.

 

> can a pressure transmitter with span limit 0.06-6 Bar measure -1 to +1 Bar?

It depends on whether your transmitter is measuring Bar gauge or Bar absolute. The range -1 to +1 Bar is obviously Bar gauge (0 - 2 Bar absolute) so you may be able to measure 0.06 - 1 if the transmitter is bar absolute.