The M5/M6/M8 series are miniature laser diffuse-reflective photoelectric sensors housed in stainless-steel or nickel-plated brass. A 650 nm Class 1 visible red laser delivers a standard 2 mm spot (0.3 / 0.5 / 1.0 mm options) with a sensing range adjustable from 15 mm to 200 mm. The sensors provide NPN or PNP complementary outputs, operate from 10–30 V DC and achieve 100 Hz switching frequency with 5 ms response time. Integrated short-circuit, reverse-polarity and overload protection make them ideal for high-precision detection in confined spaces. CE and RoHS approved.
A 650 nm laser diode emits a collimated beam onto the target; diffused light returns to a high-speed PIN photodiode. After TIA amplification and filtering, a comparator with temperature compensation drives a push-pull stage. A multi-turn potentiometer sets the distance threshold within 15–200 mm. Laser class 1 (IEC 60825-1).
Detailed Specifications (English)
Parameter
M5*20-TZ
M6-20-TZ / M6-26
M8*25
Notes / Conditions
Sensing principle
Laser diffuse reflection (coaxial)
Same
Same
Standard sensing range
15–100 mm
20–150 mm
20–200 mm
White paper 100×100 mm, adjustable
Light source / wavelength
Laser diode 650 nm
Laser diode 650 nm
Laser diode 650 nm
Visible red, Class 1
Spot diameter
Std. 2 mm (0.3/0.5/1.0 mm opt.)
Same
Same
At 100 mm
Output configuration
NPN NO/NC or PNP NO/NC
Same
Same
3-wire, push-pull 120 mA
Supply voltage
10–30 V DC
10–30 V DC
10–30 V DC
Reverse-polarity protected
No-load current
<10 mA
<10 mA
<10 mA
@24 V
Load current (max)
120 mA
120 mA
120 mA
Short-circuit protected 150 mA
Leakage current
<0.01 mA
<0.01 mA
<0.01 mA
Voltage drop
<1.5 V
<1.5 V
<1.5 V
@120 mA
Switching frequency
100 Hz
100 Hz
100 Hz
Response time
5 ms
5 ms
5 ms
10–90%
Switching hysteresis
<15% Sr
<15% Sr
<15% Sr
Repeat accuracy
<5% Sr
<5% Sr
<5% Sr
Stable temp/voltage
Temperature drift
±10% typ.
±10% typ.
±10% typ.
0–55 °C
Protection class
IP55 (IEC 60529)
IP55 (IEC 60529)
IP55 (IEC 60529)
Ambient temperature
0 … +55 °C
0 … +55 °C
0 … +55 °C
Non-condensing
Housing material
Stainless steel 1.4305
Stainless steel 1.4305
Nickel-plated brass
Weight
≈47.2 g
≈47.3 g
≈49.8 g
With 200 mm cable
Connection
PUR 3×0.15 mm² Ø3.8 mm 1.5 m; front fiber 4.5 mm×420 mm
Same
Same
Custom length on request
Approvals
CE, RoHS
CE, RoHS
CE, RoHS
Frequently Asked Questions
What is the sensing range of the M5/M6/M8 laser diffuse-reflective sensor?
The standard sensing range is adjustable from 15 mm to 200 mm against a 100×100 mm white-paper target: roughly 15–100 mm for the M5, 20–150 mm for the M6 and 20–200 mm for the M8. A multi-turn potentiometer sets the distance threshold. Darker, glossy or transparent targets shorten the usable range, so set the threshold against your actual workpiece.
Should I order NPN or PNP output for this laser photoelectric sensor?
Both are available as 3-wire complementary outputs with NO/NC switching. PNP (sourcing) is the default for most modern PLCs, while NPN (sinking) suits many Asian controls. The push-pull stage drives up to 120 mA with short-circuit and reverse-polarity protection. Match the output type and NO/NC logic to the input card of the sensor you are replacing.
Why choose a laser diffuse sensor over an inductive proximity switch?
A 650 nm Class 1 visible red laser produces a small 2 mm spot (0.3/0.5/1.0 mm optional) for high-precision, non-contact detection of any material, not just metal. That makes it ideal for PCB marks, wafer mapping, micro-gripper positioning and small-part presence in confined spaces where an inductive proximity switch cannot resolve fine detail or non-metal targets.
Can this sensor replace an Omron, SICK, Keyence or Autonics miniature laser sensor?
In most cases yes. It uses the common M5/M6/M8 thread sizes, 10–30 V DC supply, 3-wire NPN/PNP wiring and a PUR cable, so it fits the same bracket and field wiring. Confirm the thread (M5*20, M6-20/M6-26 or M8*25), output type and required 15–200 mm range, then set the threshold to match.
What protection rating and operating temperature does it have?
The M5/M6/M8 laser diffuse sensor is rated IP55 per IEC 60529 with a stainless-steel 1.4305 or nickel-plated brass housing and a 0 to +55 °C ambient range. It is CE and RoHS approved and the laser is Class 1 per IEC 60825-1, making it eye-safe for general industrial use on machinery and robotics.
