Autonics PRD Series Cylindrical Inductive Proximity Long- distance Sensor Switch(DC-3-Wire-Type)

Sensor Switch, Inductive Proximity Sensor Switch, Proximity Sensor SwitchAutonics

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2025/7/4 Update

Autonics PRD Series Cylindrical Inductive Proximity Long- distance Sensor Switch(DC-3-Wire-Type)
— Offer multiple installation types, detection diameters, and distances. They ensure stable operation, with certifications, and come in various wire types and connection specifications.

Autonics PRD Series Cylindrical Inductive Proximity Long- distance Sensor Switch(DC-3-Wire-Type)

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Technical Features

Splash-proof type: PTFE non-stick coating for splash prevention, prevents malfunction

Red indicator light to easily confirm operation status

Adopts Cable support structure
: Strengthens the sensor/cable connection part to achieve superior bending strength (except for Ø 8 mm models)

IP67 protection rating (IEC standard)

Products Specifications

Mounting method: Flush type

Property	Ø 8 mm	Ø 12 mm	Ø 18 mm	Ø 30 mm
General type	PRD■08-2D■	PRD■12-4D■	PRD■18-7D■	PRD■30-15D■
Spatter-resistant type	–	PRDACM12-4D■	PRDACM18-7D■	PRDACM30-15D■
Sensing face diameter	Ø 8 mm	Ø 12 mm	Ø 18 mm	Ø 30 mm
Sensing distance	2 mm	4 mm	7 mm	15 mm
Setting distance	0 ~ 1.4 mm	0 ~ 2.8 mm	0 ~ 4.9 mm	0 ~ 10.5 mm
Hysteresis	≤ 15% of sensing distance	≤ 10% of sensing distance
Standard target: Iron	8 × 8 × 1 mm	12 × 12 × 1 mm	20 × 20 × 1 mm	45 × 45 × 1 mm
Response frequency ⁰¹⁾	1 kHz	500 Hz	300 Hz	100 Hz
Temperature influence	Within ±10% of sensing distance at 20°C ambient temperature (Sensing face Ø 8 mm: ≤ ±15%)
Indicator	Operation indicator (Red)
Certification

Mounting method: Non-flush type

Property	Ø 8 mm	Ø 12 mm	Ø 18 mm	Ø 30 mm
General type	PRD■08-4D■	PRD■12-8D■	PRD■18-14D■	PRD■30-25D■
Sensing face diameter	Ø 8 mm	Ø 12 mm	Ø 18 mm	Ø 30 mm
Setting distance	0 ~ 2.8 mm	0 ~ 5.6 mm	0 ~ 9.8 mm	0 ~ 17.5 mm
Sensing distance	4 mm	8 mm	14 mm	25 mm
Hysteresis	≤ 15% of sensing distance	≤ 10% of sensing distance
Standard target: Iron	12 × 12 × 1 mm	25 × 25 × 1 mm	40 × 40 × 1 mm	75 × 75 × 1 mm
Response frequency ⁰¹⁾	800 Hz	400 Hz	200 Hz	100 Hz
Temperature influence	Within ±10% of sensing distance at 20°C ambient temperature (Sensing face Ø 8 mm: ≤ ±15%)
Indicator	Operation indicator (Red)
Certification

The response frequency is an average value. The measurement conditions are: using the standard sensing target, the distance to the target is twice the size of the standard sensing target, and the setting distance is 1/2 of the sensing distance.

Body weight (including packaging)

		Ø 8 mm	Ø 12 mm	Ø 18 mm	Ø 30 mm
Cable type	Normal	≈ 43 g (≈ 63 g)	≈ 62 g (≈ 74 g)	≈ 97 g (≈ 115 g)	≈ 143 g (≈ 180 g)
Cable type	Long	–	≈ 82 g (≈ 94 g)	≈ 127 g (≈ 145 g)	≈ 183 g (≈ 220 g)
Cable with plug type	Normal	≈ 25 g (≈ 45 g)	≈ 37 g (≈ 67 g)	≈ 62 g (≈ 80 g)	≈ 108 g (≈ 145 g)
Cable with plug type	Long	–	≈ 32 g (≈ 55 g)	≈ 92 g (≈ 110 g)	≈ 130 g (≈ 203 g)
Plug-in type	Normal	≈ 12 g (≈ 32 g)	≈ 20g (≈ 49 g)	≈ 41 g (≈ 81 g)	≈ 138 g (≈ 197 g)
Plug-in type	Long	–	≈ 24 g (≈ 54 g)	≈ 60 g (≈ 78 g)	≈ 193 g (≈ 252 g)

Property	Specification
Power supply voltage	12-24 VDC (ripple P-P: ≤ 10%), Operating voltage range: 10-30 VDC
Current consumption	≤ 10 mA
Control output	≤ 200 mA
Residual voltage	Sensing face Ø 8mm: ≤ 2 V Sensing face Ø 12 mm, Ø 18 mm, Ø 30 mm: ≤ 1.5 V
Protection circuit	Surge protection, output short-circuit overcurrent protection, power supply reverse polarity protection
Insulation resistance	≥ 50 MΩ (500 VDC megger)
Dielectric strength	Sensing face Ø 8mm :1,000 VAC~ 50/60 Hz for 1 minute (between all terminals and housing) (Plug-in type: 1,500 VAC~ 50/60 Hz for 1 minute (between all terminals and housing))
	Sensing face Ø 12 mm, Ø 18 mm, Ø 30 mm :1,500 VAC~ 50/60 Hz for 1 minute (between all terminals and housing)

Vibration resistance	10 ~ 55 Hz (1-minute period) amplitude 1mm, 2 hours in each X, Y, Z direction
Shock resistance	500 m/s² (≈ 50 G), 3 times in each X, Y, Z direction
Operating ambient temperature	-25 ~ 70 °C, During storage: -30 ~ 80 °C (no freezing, no condensation)
Operating ambient humidity	35 ~ 95 %RH, During storage: 35 ~ 95 %RH (no freezing, no condensation)
Protection class	IP67 (IEC standard)
Connection method	Cable type ⁽¹⁾ / Cable with plug type ⁽²⁾ / Plug-in type
Cable specification ⁽²⁾	Sensing face Ø 8 mm: Ø 3.5 mm, 3-core Sensing face Ø 12 mm: Ø 4 mm, 3-core Sensing face Ø 18 mm, Ø 30 mm: Ø 5 mm, 3-core
Core wire specification	Ø 3.5 mm cable: AWG 24 (0.08 mm, 40 cores), insulation O.D.: Ø 1 mm Ø 4 mm, Ø 5 mm cable: AWG 22 (0.08 mm, 60 cores), insulation O.D.: Ø 1.25 mm
Connector specification	M12 Connector
Material	Standard type cable (black): PVC Oil-resistant reinforced cable (gray): Oil-resistant reinforced PVC
General type	Housing/Nut: Nickel-plated brass (Sensing face Ø 8 mm plug-in type housing: SUS303), Gasket: Nickel-plated iron, Sensing face: PBT
Spatter-resistant type	Housing/Nut: Brass (PTFE non-stick coating), Gasket: Iron (PTFE non-stick coating), Sensing face: PTFE

Spatter-resistant type excluded
Cable type: 2m, Cable with plug type: 300mm

Setting Distance Calculation Formula

The shape, size, and material of the sensing object all affect the sensing distance. For stable detection, please install within 70% of the sensing dzistance.

Influence of Mutual Interference and Surrounding Metal

■ Mutual Interference

As shown in the figure below, when two or more proximity switches are installed face-to-face or side-by-side, malfunctions may occur due to frequency interference. The installation spacing must meet the requirements of the table below.

■ Influence of Surrounding Metal

If metal is present around the proximity switch, it may cause malfunctions such as poor resetting. To prevent malfunctions, the installation spacing must meet the requirements of the table below.

(Unit: mm)

Sensing face —- Item	Ø 8 mm		Ø 12 mm		Ø 18 mm		Ø 30 mm
Sensing face —- Item	Flush type	Non-flush type	Flush type	Non-flush type	Flush type	Non-flush type	Flush type	Non-flush type
A	20	80	25	120	50	200	110	350
B	15	60	25	100	35	110	90	300
l	0	12	2.5	15	3.5	14	6	20
Ød	8	24	18	40	27	70	45	120
m	6	8	12	20	24	40	45	90
n	12	24	18	40	27	70	45	120

Allowable Installation Torque

When tightening the nut, please use the provided washer. The allowable nut torque is the value when using the attached washer and inserting as shown in the figure below.

Sensing side —– Strength	Ø 8 mm		Ø 12 mm		Ø 18 mm		Ø 30 mm
Sensing side —– Strength	Flush type	Non-flush type	Flush type	Non-flush type	Flush type	Non-flush type	Flush type	Non-flush type
Front part dimension	7 mm	5 mm	13 mm	7 mm	–	–	26 mm	12 mm
Front part torque	3.92 N·m		6.37 N·m		14.7 N·m		49 N·m
Rear part torque	8.82 N·m		11.76 N·m		14.7 N·m		78.4 N·m

Safety Precautions/Precautions for Use/Installation Precautions

Safety Precautions

‘Safety Precautions’ are for the correct use of this product to prevent dangerous accidents. Please observe the following.
Unexpected accidents or dangers may occur under special conditions.

Warning: Failure to follow these instructions may result in serious injury or death.

For machines that have a large impact on people and property (e.g., nuclear power control, medical equipment, ships, vehicles, railways, aviation, disaster/theft prevention devices, etc.), be sure to install dual safety protection devices.
- Otherwise, it may cause personal injury, property damage, or fire.
Do not use in environments with flammable or explosive gases, humidity, direct sunlight, radiant heat, vibration, impact, or salinity.
- Otherwise, there is a risk of explosion or fire.
Do not modify the product.
- Otherwise, there is a risk of fire or electric shock.
Do not perform wiring or maintenance work while the power is on.
- Otherwise, there is a risk of fire or electric shock.
When wiring, please confirm the wiring diagram before connecting.
- Otherwise, there is a risk of fire or electric shock.

Caution: Failure to follow these instructions may result in minor injury or product damage.

Please use within the rated specifications.
- Otherwise, there is a risk of fire or product failure.
When cleaning, do not use water or organic solvents. Use a dry cloth to wipe.
- Otherwise, there is a risk of fire or electric shock.
When there is no load, do not connect the power.
- Otherwise, there is a risk of fire or product failure.

Usage Precautions

Please observe the contents of these precautions during use. Failure to do so may result in unforeseen accidents.
The 12-24 VDC power supply voltage must be supplied by an insulated and voltage/current limited power source or a Class 2, SELV power supply device.
Please use this product 0.5 seconds after powering on.
To prevent surges and inductive interference, please route wiring separately from high-voltage and power lines, and keep the cable length as short as possible. Do not use near machines (radio transceivers, etc.) that generate strong magnetic fields and high-frequency interference.
If installed near equipment that generates strong surges (motors, welders, etc.), please use a diode or varistor to eliminate the surge.
If the product surface is scratched with a hard object, the PTFE coating will be stripped off.
This product can be used under the following environmental conditions.
- Indoors (UL Type 1 Enclosure)
- Altitude of 2,000m or less
- Pollution Degree 3
- Installation Category II

Installation Precautions

Please install correctly according to the operating environment, location, and rated specifications.
Do not apply impact with hard objects or forcefully bend the cable outlet, as this may damage the waterproof function.
For Ø 3.5 mm cable, do not apply more than 25N of force. For Ø 4 mm cable, do not apply more than 30N of force. For Ø 5 mm cable, do not apply more than 50N of tensile force. A broken cable may cause a fire.
When extending the cable, please use AWG22 or thicker cable, and the maximum length must not exceed 200 m.