Being a differential pressure meter, The PT-200 measures the difference in pressure between its sample (+ input) and reference (- input) ports. A multi-range analog output and a serial data output are standard.

Many applications call for measuring small changes in pressure anywhere over the instrument's range. The PT-200 excels at this, with full offsetting and gain capability over the entire range of the instrument. This capability allows you to subtract a constant offset from the pressure transducer's output, and amplify only deviations from that value. The offset value is set by the inbuilt microprocessor, on command.

The PT-200 also has an invaluable feature you won't find on other commercially-available instruments. As an alternative to manually setting the offset value it can offset itself automatically, canceling long-term pressure drifts but faithfully amplifying the more rapid signals of interest. It can do this with either of two time-constants (10 or 60 seconds). This makes the PT-200 a "natural" for demanding applications such as whole-body plethysmography, in which a tiny, rapidly-varying signal rides on a much larger, more slowly-varying signal.

Because the PT-200 doesn't use a floppy membrane as its sensing element, it's tough as well as sensitive. It can take a full one-half of an atmosphere differential pressure without damage.

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