Fixed-range transmitters force a stocking decision: keep one spare for every range on site, or risk downtime waiting for the right scale to arrive. The STS PTM ends that trade by moving the range adjustment into software.

How does a 1:4 scalable range change spares strategy?

Zero and span are set through software commands within -5 to +105 percent of the nominal range, so a 0-10 bar unit rescales to 0-7.5 bar or 0-2.5 bar in minutes, no reference instruments needed at the cabinet. Accuracy holds at 0.25% FS standard or 0.10% FS on the precision option across the 100 mbar to 1000 bar span. Compared with holding five fixed-range spares, one PTM covers the same duties, and compared with sending units back to the factory for rescale it happens on the bench or in the field.

What changes when the media turns aggressive?

Wetted parts come in stainless steel or titanium, the latter aimed at acidic and otherwise aggressive media where 316L dissolves. Process temperature runs -40 to 150 deg C with the piezoresistive cell suited to static and dynamic pressure. The modular STS Sensor Technik Sirnach AG platform extends to the PTM/RS485 variant that adds digital Modbus output and a second temperature channel on the same body, and to the ATM family for standard analog duties, so a plant can standardize one vendor across ranges that would otherwise need several brands.