Proximity Sensors Technical Guide

The following conditions must be considered to understand the conditions of the application and location as well as the relation to control

equipment.

●Model Selection

* mT (millitesla) is a unit for expressing magnetic flux density. One tesla is the equivalent of 10,000 gauss.

Precautions for Correct Use

Item

Points of consideration

Sensing

object and

operating

condition of

Proximity

Sensor

Electrical

conditions

Environ-

mental

conditions

Mounting

conditions

Influence of

external

electromag-

netic fields

• Sudden changes in the DC magnetic field may cause malfunction. Do not use the Sensor for applications that involve turning a

DC electromagnet ON and OFF.

• Do not place a transceiver near the Sensor or its wiring. Doing so may cause malfunction.

Other con-

siderations

Cost feasibility: Price/delivery time

Life: Power-ON time/frequency of use

Check the relation between the sensing object

and the Proximity Sensor.

Sensing object

Proximity Sensor

Sensing

distance

Surrounding

metals

Specific condi-

tions of object

Direction of ob-

ject movement

Peripheral metal

Sensing distance

Material, size,

shape, existence

of plating, etc.

Transit interval,

speed, existence

of vibration, etc.

Material, distance

to Sensor, orien-

tation, etc.

Fluctuation in

transit point, al-

lowable error, etc.

Sensing (set) distance, shape of Sensor (rectangular, cylindrical, through-

beam, grooved), influence of peripheral metal (Shielded Sensors, Non-

shielded Sensors), response speed (response frequency), influence of

temperature, influence of voltage, etc.

Verify the electrical conditions of the control system

to be used and the electrical performance of the

Proximity Sensor.

Load

Output

DC (voltage fluctuation, current capac-

ity value)

AC (voltage fluctuation, frequency,

etc.)

Need for S3D2 Controller

Power

supply

Selecting the power

supply type

DC

DC + S3D2 Controller

AC

{

Resistive load - Non-contact control

system

Inductive load - Relay, solenoid, etc.

• Steady-state current, inrush current

• Operating, reset voltage (current)

Lamp load

• Steady-state current, inrush current

Open/close frequency

Load

Selecting the power

supply type

DC

DC + S3D2 Controller

AC

Control output

Maximum current

(voltage)

Leakage current

Residual load voltage

{

The environmental tolerance of the Proximity Sensor

is better than that of other types of Sensors. However,

investigate carefully before using a Proximity Sensor

under harsh temperatures or in special atmospheres.

• Water Resistance

Do not use the Sensor in water, rain, or outdoors.

• Ambient Conditions

To maintain reliability of operation, do not use the

Sensor outside the specified temperature range or

outdoors. Even though the Proximity Sensor has a

water-resistant structure, it must be covered to pre-

vent direct contact with water or water-soluble cut-

ting oil. Do not use the Sensor in atmospheres with

chemical vapors, in particular, strong alkalis or ac-

ids (nitric acid, chromic acid, or hot concentrated

sulfuric acid).

• Explosive Atmospheres

Do not use the Sensor in atmospheres where

there is a danger of explosion. Use an Explosion-

proof Sensor.

Temperature

and humidity

Highest or lowest

values, existence

of direct sunlight,

etc.

Temperature influence,

high-temperature use,

low temperature use,

need for shade, etc.

Atmosphere

Water, oil, iron

powder, or other

special chemicals

Need for water resis-

tance or oil resistance,

need for explosion-

proof structure

Vibration and

shock

Size, duration

Need for strength,

mounting method

When deciding the mounting method, take into consideration not

only restrictions due to mechanical devices, but also ease of main-

tenance and inspection, and interference between Sensors.

Wiring method,

existence of in-

ductance surges

Connection

Wires

Wire type, length, oil-resistant

cable, shielded cable, robot

cable, etc.

Conduits, ducts, pre-wired,

terminal wiring, ease of main-

tenance and inspection

Mounting procedure

Installation location

Existence of mounting

brackets, direct mounting,

secured with bolts or screws

Ease of maintenance and

inspection, mounting space

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