Autonics PRFA Series Catalog Page

PRFA Series

Full Metal, Cylindrical, Spatter-Resistance, Cable Type, Proximity Sensor

Features

High impact and wear resistance to friction with the work or metallic brush
(sensing face/housing material: stainless steel)
Reduced possibility of malfunction by aluminum scraps
Prevent malfunction due to spatter with PTFE coating
Excellent noise immunity with specialized sensor IC
Built-in surge protection circuit and output short over current
protection circuit
Excellent visibility with a 360° ring type of indicator (red LED)
(except for PRFAT08 model)
Equipped with the oil resistant cable
Protection structure: IP67 (IEC standard)

Please read “Safety Considerations”
in the instruction manual before using.

The Characteristic of Spatter-Resistance Type

The hot arc from arc welding machine is adhesive even with metals or plastics.
Therefore, normal proximity sensor might have malfunction even though there are no sensing object if the arcs are put on the sensing
surface. The arcs are not adhered on the sensing part of the spatter-resistance type proximity sensor as the part is coated with PTFE
against thermal resistance.
Also, the protection cover sold optionally has the same function.

Durability Test

Highly resistant to the impact of removing welding sludge attached to the sensing face

Continuous hitting test Metallic brush test

SENSORS

CONTROLLERS

MOTION DEVICES

SOFTWARE

(A)
Photoelectric
Sensors

(B)
Fiber Optic
Sensors

(C)
LiDAR

Test conditions

Hitting object: 1.3kg of weight
Hitting speed: 48 times per 1 min
The number of hitting times: 300 thousand times
Test model: PRFA18

Test conditions

Testing object: stainless cup brush
Rotation speed: 80RPM
Testing time: 3 hours
Test model: PRFA18

<Test result> <Test result>

Electromagnetic Resistance Test

Large current from welding generates magnetic eld which can affect the proximity sensor to malfunction due to noise.

This product, however, can be used near strong noise without malfunctioning, thanks to excellent electromagnetic resistance.
This test is conducted in the environment of welding.

Test conditions

Welding current: 13,000A
Installation direction: front and side
Test model: PRFA Series

Diameter of
sensing side

Minimum sensing distance between

weld and sensor
Installation direction Front Side
8mm 60mm 70mm
12mm 30mm 60mm
18mm 10mm 50mm
30mm 120mm 120mm

※Minimum sensing distance can be different by welding
environment.

F-37

(D)
Door/Area
Sensors

(E)
Vision
Sensors

(F)
Proximity
Sensors

(G)
Pressure
Sensors

(H)
Rotary
Encoders

(I)
Connectors/
Connector Cables/
Sensor Distribution
Boxes/ Sockets

PRFA Series

Effect of Aluminum Scraps

When aluminum scraps are attached or stacked at sensing side, the proximity sensor does not detect and sensing signal is OFF.
However, the below cases may occur to sensing signal. In this case, remove the scraps.

(1) When the size of aluminum scraps (d) is bigger than 2/3 of the

sensing side size (D)

(d)

(D)

Model

PRFAT08 6

PRFAT12 10

PRFAT18 16
PRFAT30 28

Size

D (mm)

Specifications

● DC 2-wire type

Model
Diameter of sensing side 8mm 12mm 18mm 30mm
Sensing distance

※

1

Installation Shield (ush)
Hysteresis Max. 15% of sensing distance
Standard sensing target 8×8×1mm (iron) 12×12×1mm (iron) 30×30×1mm (iron) 54×54×1mm (iron)
Setting distance 0 to 1.05mm 0 to 1.4mm 0 to 3.5mm 0 to 7mm

Power supply (operating voltage)
Leakage current Max. 0.8mA
Response frequency

※

2

Residual voltage Max. 3.5V
Affection by Temp. Max. ±20% for sensing distance at ambient temperature 20
Control output Max. 3 to 100mA
Insulation resistance Over 50MΩ (at 500VDC megger)

Dielectric strength 1,000VAC 50/60Hz for 1 min
Vibration 1.5mm amplitude at frequency 10 to 55Hz (for 1 min) in each X, Y, Z direction for 2 hours

Shock

Indicator Operation indicator: Red LED

Ambient temperature -25 to 70℃, storage: -25 to 70

Environ-

ment

Ambient humidity 35 to 95%RH, storage: 35 to 95%RH
Protection circuit Surge protection circuit, output short over current protection circuit
Protection IP67 (IEC standard)

※

3

Cable

Material

Approval

※

5

Weight

※

1: Use accessories (nut, washer) made of SUS. Or, sensing distance cannot be guaranteed.
2: The response frequency is the average value. The standard sensing target is used and the width is set as 2 times of the standard

※

sensing target, 1/2 of the sensing distance for the distance.

※

3: Do not pull the Ø4mm cable with a tensile strength of 30N or over and the Ø5mm cable with a tensile strength of 50N or over.

It may result in fire due to the broken wire. When extending wire, use AWG22 cable or over within 200m.

※

4: Option is 5m.
5: The weight includes packaging. The weight in parenthesis is for unit only.

※
※

Environment resistance is rated at no freezing or condensation.

PRFAT08-1.5DO-V PRFAT12-2DO-V PRFAT18-5DO-V PRFAT30-10DO-V

1.5mm 2mm 5mm 10mm

12-24VDCᜡ (10-30VDCᜡ)

200Hz 100Hz 80Hz 50Hz

500m/s2 (approx. 50G)

in each X, Y, Z direction

1,000m/s2 (approx. 100G) in each X, Y, Z direction for 10 times

for 10 times

℃

※

Ø4mm, 2-wire, 2m

4

Ø5mm, 2-wire, 2m

AWG22, core diameter: 0.08mm, no. of cores: 60, insulator diameter: Ø1.25mm
Case/Nut: Stainless steel 303 (SUS303, PTFE coated), Washer: Stainless steel 304 (SUS304),

Sensing side: Stainless steel 303 (SUS303 , PTFE coated, thickness is 0.8mm, in case of PRFAT08 is 0.4mm),
Oil resistant cable (gray): Oil resistant polyvinyl chloride (PVC)

ᜢ

Approx. 80g (approx. 55g) Approx. 110g (approx. 83g)

(2) When aluminum scraps are attached on the sensing side by

external pressure

External pressure

Aluminum scraps

℃

※

4

Approx. 132g (approx. 97g)

Approx. 225g (approx. 170g)

F-38