ST420 Shaft Speed Sensor — Electro‑Sensors
The ST420 is a two-wire, loop-powered, 4–20 mA analog output shaft speed sensor housed in rugged stainless steel. It detects magnetic pulses from a shaft-mounted pulser disc or wrap, automatically outputting a continuous analog signal proportional to shaft speed. With no user calibration required and intrusion-protected design, it’s ready for industrial use right out of the box.
Item Attributes
| Accuracy | ±0.25 % @25 °C; ±0.50 % over temperature |
| Temperature Range | –20 °C to +80 °C (–4 °F to +176 °F) |
| Signal Output | 4–20 mA, loop-powered |
| Housing | Stainless steel, M18×1, NEMA 4X/IP67 |
| Speed Range | 0.2–200 RPM (low), 0.2–2000 RPM (high), 8 pulses/revolution |
| Power Supply | 8–30 V DC (nominal 24 V) |
| Response Time | |
| Sensor Gap | 1/4″ ± 1/8″ (6.35 ± 3.2 mm) |
Other Product
0131966
Send Inquiry
04.0229.3653.CRE
Send Inquiry
1-1/4 IN X 12-1/2 IN
Send Inquiry
1-301-52-276
Send Inquiry