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Business > Industrial Devices > Automation Controls Top > FA Sensors & Components > Sensors > Photoelectric Sensors / Laser Sensors > Ultra-compact Photoelectric Sensor EX-20 Ver.2 > Cautions For Use

Ultra-compact Photoelectric Sensor EX-20 Ver.2

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Sensing characteristics

Cautions For Use

Never use this product as a sensing device for personnel protection.
In case of using sensing devices for personnel protection, use products which meet laws and standards, such as OSHA, ANSI or IEC etc., for personnel protection applicable in each region or country.

Mounting

Mount using M3 screws. The tightening torque should be 0.5 N·m or less.

Note:	When mounting the front sensing type sensor, use M3 pan head screws without washers, etc.

When mounting the front sensing type from the backside, fit the mounting spacer (MS-EX20-FS) and fix with screws.

Mounting method

1	Fit the mounting spacer on the sensor.

2	Align the mounting holes of the mounting spacer and the sensor and mount with M3 screws. The tightening torque should be 0.5 N·m or less.

Sensitivity adjustment (side sensing type only)

Step	Sensitivity adjuster	Description
1		Turn the sensitivity adjuster fully counterclockwise to the minimum sensitivity position (• mark).
2		In the light received condition, turn the sensitivity adjuster slowly clockwise and confirm the point Ⓐ where the sensor enters the “Light” state operation.
3		In the dark condition, turn the sensitivity adjuster further clockwise until the sensor enters the “Light” state operation and then bring it back to confirm point Ⓑ where the sensor just returns to the “Dark” state operation. (If the sensor does not enter the “Light” state operation even when the sensitivity adjuster is turned fully clockwise, this extreme position is point Ⓑ .)
4		The position at the middle of points Ⓐ and Ⓑ is the optimum sensing position.

Notes:

1)	Use the attached adjusting screwdriver to turn the adjuster slowly. Turning with excessive strength will damage the adjuster.
2)	In case of using EX-22□ at a sensing distance of 50 mm 1.969 in or less, take care that the sensitivity adjustment range becomes extremely narrow.

Operation mode switch (EX-23□ only)

Switch position	Description
	Light-ON mode is obtained when the operation mode switch (located on the receiver) is turned fully clockwise (L side).
	Dark-ON mode is obtained when the operation mode switch (located on the receiver) is turned fully counterclockwise (D side).

Note:	Operation mode switch should be turned fully till it stops.

Stability indicator

The stability indicator (green) lights up when the incident light intensity has sufficient margin with respect to the operation level.
If the incident light intensity level is such that the stability indicator lights up, stable sensing can be done without the light received operation and the light interrupted operation being affected by a change in ambient temperature or supply voltage.

Glossy object sensing (EX-29□)

Please take care of the following points when detecting materials having a gloss.

Wiring

Excess bending of the cable or stress applied to the cable may disconnect the internal lead wire.

Others

Do not use during the initial transient time (50 ms) after the power supply is switched on.
If sensors are mounted close together and the ambient temperature is near the maximum rated value, provide for enough heat radiation / ventilation.
If a reflective object is present in the background, the sensing of EX-28□ may be affected. When setting the sensor, make sure to confirm that the reflective object has no effect. In case the reflective object affects the sensing, take measures such as removing the reflective object or coloring it in black, etc.

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