Autonics PRM Series Cylindrical Inductive Proximity Sensor Switch(DC-2-Wire-Type)

Sensor Switch, Inductive Proximity Sensor Switch, Proximity Sensor SwitchAutonics

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2025/7/4 Update

PRM Series Autonics Cylindrical Inductive Proximity Sensors Specifications
— These sensors operate at 15 – 30VDC, detect metal objects, have IP67 protection, and are suitable for industrial use.

Autonics PRM Series Cylindrical Inductive Proximity Sensor Switch(DC-2-Wire-Type)

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Technical Features

Analog output type, supports 1 – 10 V, 4 – 20 mA output

Red indicator light for easy confirmation of power status

IP67 protection rating (IEC standard)

Products Specifications

1. 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.
2. Linearity is only applicable for the linear distance range. Beyond the linear distance, the output deviation is within ±5% F.S.
3. In an environment with a temperature of 20°C, a power supply voltage of 24 VDC, and a load of 4.7 kΩ (cable type)/300Ω (connector type), the standard sensing target is used as the basis.
4. Cable outgoing type: 2 m, Cable outgoing connector type: 300 mm.

Model name	PRM☐18-5D☐	PRM☐18-8D☐	PRM☐30-10D☐	PRM☐30-15D☐
Power supply voltage	18-30 VDC (ripple P-P: ≤10%), usable voltage range: 16.5-33 VDC
Sensing distance	1-5 mm	2-8 mm	2-10 mm	3-15 mm
Linear distance	1-3.5 mm	2-5.5 mm	2-7 mm	3-10 mm
Standard sensing target: Iron	18 × 18 × 1 mm	25 × 25 × 1 mm	30 × 30 × 1 mm	45 × 45 × 1 mm
Sensing side diameter	Ø 18 mm	Ø 30 mm
Current consumption	Below 20 mA (excluding load)
Response frequency ⁰¹⁾	200 Hz	200Hz
Influence of temperature	Within ±5% of sensing distance at 20°C ambient temperature
Indicator	Power indicator (red)
Repeat accuracy	±5% (Linear distance, for output deviation to ideal linear curve, max linear output deviation is ±5% or less of F.S.) ⁰²⁾
Linearity	±3%
Protection circuit	Surge protection circuit, reverse polarity protection circuit
Insulation resistance	≥50 MΩ (500VDC megger)
Dielectric strength	1,500 VAC ~ 50/60 Hz 1 minute (between all terminals and case)
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
Resistive load	DC (voltage output type) 4.7 kΩ / DC (current output type) below 300 Ω
Voltage influence ⁰³⁾	Within ±0.5% F.S. of the output at rated voltage, for ±10% change in power supply voltage at room temperature.
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	Cable outgoing type / Cable outgoing connector type ⁰⁴⁾
Cable specification	Sensing side Ø 18 mm, Ø 30 mm: Ø 5 mm, 3-core
Conductor specification	Ø 5mm cable: AWG 22 (0.08 mm, 60-core), insulation outer diameter: Ø 1.25 mm
Connector specification	M12 connector
Material	General cable (black): Polyvinyl chloride (PVC), Case/Nut: Brass, nickel-plated, Washer: Iron, nickel-plated, Sensing side: PBT
Approvals
Product weight	≈ 110 g	≈ 58 g	≈ 170 g	≈ 122 g

Distance-Output Characteristics

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 side _______________ Item	Ø 18 mm		Ø 30 mm
Sensing side _______________ Item	Flush type	Non-flush type	Flush type	Non-flush type
A	30	48	60	90
B	36	54	60	90
l	0	14	0	15
Ød	18	54	30	90
m	15	24	30	45
n	27	54	45	90

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 face ——————Strength	Ø 18 mm		Ø 30 mm
Sensing face ——————Strength	Flush type	Non-flush type	Flush type	Non-flush type
Front-end dimension	–	–	26 mm	12 mm
Front-end torque	14.7 N·m		49 N·m
Rear-end torque	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.