Autonics PFI Series Square Inductive Flat Type Proximity Sensor Switch (AC-2-Wire-Type)

Sensor Switch, Inductive Proximity Sensor Switch, Proximity Sensor SwitchAutonics

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2025/7/4 Update

Autonics PFI Series Square Inductive Flat Type Proximity Sensor Switch (AC-2-Wire-Type)
— Flat structure, convenient for installation in narrow spaces (Height 10 mm), IP67 protection rating (IEC standard), Red indicator light for easy confirmation of operation status

Autonics PFI Series Square Inductive Flat Type Proximity Sensor Switch (AC-2-Wire-Type)

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Technical Features

Flat structure, convenient for installation in narrow spaces (Height 10 mm)

IP67 protection rating (IEC standard)

Red indicator light for easy confirmation of operation status

Products Specifications

Mounting method: Standard type / Top sensing type

Property	Specification
Mounting method	Top sensing type
Model	PFI25-8A■
Sensing face length	25 mm
Sensing distance	8 mm
Setting distance	0 ~ 5.6 mm
Hysteresis	≤ 10% of sensing distance
Standard target: Iron	25 × 25 × 1 mm
Response frequency ⁰¹⁾	20 Hz
Temperature influence	Within ±10% of sensing distance at 20°C ambient temperature
Indicator	Operation indicator (Red)
Certification
Product net weight	≈ 70 g

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.

Power supply voltage	100-240 VAC ~ 50/60 Hz, Usable voltage range: 85-264 VAC ~
Leakage current	≤ 2.5 mA
Control output	5 ~ 150 mA
Residual voltage	≤ 10 V
Protection circuit	Surge protection circuit
Insulation resistance	≥ 50 MΩ (500 VDC megger)
Dielectric strength	2,500 VAC ~ 50/60 Hz 1 minute
Vibration	10 ~ 55 Hz (period 1 minute) amplitude 1mm X,Y,Z directions for 2 hours each
Shock	500 m/s² (≈ 50 G) X, Y, Z directions 3 times each
Ambient temperature	-25 ~ 70°C, storage: -30 ~ 80°C (no freezing, no condensation)
Ambient humidity	35 ~ 95 %RH, storage: 35 ~ 95 %RH (no freezing, no condensation)
Protection degree	IP67 (IEC standard)
Connection type	Cable outgoing type
Cable specification	Ø 4 mm, 2-core, 2 m
Conductor specification	AWG 22 (0.08 mm, 60-core), insulation outer diameter: Ø 1.25 mm
Material	Case: PPS, Standard cable (black): Polyvinyl chloride (PVC)

Outline Dimension Drawing

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 below.

A = 100mm, B = 80mm

■ 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.

d = 15mm, m = 5mm

(Unit: mm)

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.