Description

Technical Parameters

Size & Wiring

Main features of M18 photo sensor

1. Designed with dedicated IC and built-in amplifier

2. Delay start function to prevent accidental triggering of power on

3. Built in digital filter, capable of reliable operation in harsh environments

4. Dual indicator light self diagnostic function, adjustable sensitivity

5. Right angle thermoplastic polyester shell, 18mm with threaded lens for easy installation

6. Power reverse protection, output reverse protection, output overload protection, mode conversion function

Differences and selection techniques between PNP and NPN outputs of M18 photo sensor

The difference between PNP and NPN outputs of M18 photo sensor

PNP has a small conduction voltage drop, but a low reverse withstand voltage, while NPN has the opposite.

1. If the input is at a high level and the output requires a low level, the first choice is npn.

2. If the input is at a low level and the output requires a low level, choose pnp first.

3. If the input is at a low level and the output requires a high level, the first choice is npn.

4. If the input is at a high level and the output requires a high level, choose pnp first.

NPN base has high voltage, and the electrode is short circuited to the emitter. Low voltage, open circuit between electrode and emitter. That is to say, not working.

PNP base high voltage. The electrode and emitter are open circuited, which means they do not work. If a low potential is applied to the base, the collector and emitter will be short circuited.

M18 photo sensor Output forms: divided into NPN two wire, NPN three wire, NPN four wire, PNP two wire, PNP three wire, PNP four wire, AC two wire, AC five wire (with built-in relay), and DC NPN/PNP/normally open/normally closed multifunctional output. Use a multimeter to measure the resistance range. Their principle is the principle of amplifiers.

Set the multimeter to resistance mode and use the two probes of the multimeter to measure separately. You will find that the two wires with infinite resistance are the power lines. So the remaining one is the signal line.

Step 2. The PNP type and the negative pole of the power line have lower resistance when measuring the+resistance of the signal line and power line, while the NPN type has lower resistance

The trick is that the power supply in the multimeter is not on the red probe, but on the black probe. It is recommended to use a digital multimeter.

FAQ

Q: How to use a multimeter to determine the polarity of a DC power supply?

A: Using a digital multimeter, the red probe is connected to the positive terminal when displaying positive values, and to the negative terminal when displaying negative values.

The difference between NPN and PNP sensors is that the output level is different. NPN outputs a low level, while PNP outputs the opposite.

Q: How do you monitor quality of M18 photo sensor?

A: 1. Production workers are paid based on piece rate output, and if there are defective products that are not dealt with in a timely manner, they will be paid

2. There will be a fine for the sealing process! So after assembly, it must be inspected once before gluing

3. The glue filling is controlled in real-time by a fully automatic computer to adjust the blending ratio, avoiding manual adjustment of the glue ratio components

4. Quality issues caused by instability,

5. The glue filling efficiency of automated equipment is 5 times that of manual labor! Greatly improve production efficiency!

6. After complete solidification, it needs to be tested again and then packaged and stored in boxes.

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M18 Photo Sensor

M18 photoelectric sensor