"I don't think so," Elena muttered, wiping grease from her hands. She pointed to the gauge. "The mechanical pressure reads normal, but the control room thinks we’re at critical levels. The system won’t restart until the sensor confirms it’s safe. The PLC is reading a fault from the transmitter."

Siemens provides several key documents for the SITRANS P DS III:

[Insert link to the manual]

Appendix B of the manual (Electrical connections) shows pinouts: Pin 1 = V+, Pin 3 = V-, Pin 4 = HART (+), Pin 2 = not connected.