Sensors connect the physical process to the control system. A mismatch in sensing principle, range, output, connection, or environmental rating can produce unreliable detection or unsafe process information.
Choose the sensing principle
Inductive sensors detect metal; capacitive sensors can detect more materials; photoelectric sensors provide several long-range detection modes. Pressure, temperature, level, and flow instruments require a technology suited to the process medium and operating range.
Match the electrical interface
- Supply voltage and current
- PNP, NPN, relay, two-wire, NO, or NC output
- 4–20 mA, voltage, pulse, resistance, or digital protocol
- Connector pinout, cable type, and loop power
Set range and performance
Define accuracy, repeatability, hysteresis, drift, response time, and calibration needs. An unnecessarily wide range can reduce useful resolution.
Account for environment and fit
Review temperature, pressure, vibration, ingress protection, chemicals, hazardous-area requirements, corrosion, UV exposure, thread, flange, probe length, housing, cable exit, and mounting space.
Replacement enquiry
Provide the full part number, target or medium, supply, output, range, process connection, material, photographs, and quantity through the US² Automation quote form.