Adapted to: quantitative screw feeder belt scale weighing scales governor Description: Details NJ1.5-8G speed sensor: 1. Mechanical data: Housing material: high-grade steel protection class: IP67 Working range: -25 to + 100 ℃ Working distance: 12, Electrical data: Supply voltage: 0-8V DC Frequency range: 0 ~ 1500Hz difference between PNP and NPN 1. If you enter a high level, and output requires a low level, the first choice npn 2 If you enter a low level, while the output of the need for a low, first select pnp 3. If you enter a low level, and output requires a high level, first select npn 4. If you enter a high level, and the output require a high level, first select pnp PNP and NPN type transistor sensor is actually the use of saturated and off, the output of two states, are switching sensors. However, the output signal is the opposite, namely, high and low. PNP and NPN sensors (switching) is divided into six categories: 1, NPN-NO (normally open) 2, NPN-NC (normally closed) 3, NPN-NC + NO (normally open, normally closed shared type) 4, PNP-NO (normally open) 5, PNP-NC (normally closed) 6, PNP-NC + NO (normally open, normally closed shared type) PNP and NPN sensors generally have three lead wires that power line VCC, 0V line, out a signal output line. 1, PNP PNP type is when there is a trigger signal, the signal output line out and power lines connected to VCC, the equivalent of the output of high power cord. For PNP-NO type, in the absence of a trigger signal, the output line is vacant, is VCC line disconnect the power cord and out. There is a trigger signal, the issue with the same voltage VCC power line, which is out and power lines connected to VCC, the output high VCC. For PNP-NC-type, in the absence of a trigger signal is issued with the same voltage VCC power line, which is out and power lines connected to VCC, the output high VCC. When a trigger signal, the output line is vacant, is VCC line disconnect the power cord and out. For PNP-NC + NO type, in fact, more of an output line OUT, needed to choose. 2, NPN NPN type is when there is a trigger signal, the signal output line out and 0v line connection, the equivalent output low, ov. For the NPN-NO type, in the absence of the trigger signal, the output line is vacant, is 0v line and out line is disconnected. There is a trigger signal, the issue with the OV same voltage is 0V out lines and cable, output output low OV. For NPN-NC-type, in the absence of a trigger signal, the same issue with the 0V line voltage is 0V out lines and cable, output low 0V. When a trigger signal, the output line is vacant, is 0V line and out line disconnected. For NPN-NC + NO type, and PNP-NC + NO type is similar to a multi-output line OUT, and two inverted output signal lines needed to choose a high, low, four-wire connection Description: Low Level: brown --- --- output power blue white and black --- High Ground: brown, blue and white --- --- Power Output Black --- I sold the Hall ground speed sensor: NPN (L) open collector output is low 0, PNP (H) open-collector output is high one.