Expandable Area SensorPJ series


Expansion Unit

[Discontinued model]

This model has been discontinued.

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Extension unit B

No. of beam axes


No. of connectable units

8 (base unit × 1 + extension unit A or B × 7) or less*1

Beam axis spacing

20mm 0.787"*2

Maximum optical axis number

64 (PJ-L20 × 1 + PJ-L21 × 7)*3

Detection area

140 mm 5.512" (8 optical axes) to 1,260 mm 49.6" (64 optical axes)*4

Detecting distance


Detectable object

Opaque material with a diameter of 28 mm or more

Light source

Infrared LED

Indicator lamp

A string of 8, 2-color LEDs (red and green) for the transmitter and receiver

Response time

When output turned off : 7.5 ms or less, when output turned on : 15 ms or less

Control output

Operation mode

Turned on when light is being applied to all optical axes

Protection circuit

Overcurrent protection, surge absorber, reversed polarity protection





Control output

Output specifications

Maximum NPN open-collector output : 100 mA (40V or less), residual voltage : 1.0 V or less


Power voltage

12 to 24 VDC (±10%), ripple (p-p) : 10% max.

Current consumption.

20 mA (total of T, R)

Environmental resistance

Enclosure rating


Operating ambientluminance

Incandescent lamp : 5,000 lux or less, sunlight : 20,000 lux or less

Operating temperature range

-10 to 55°C 14 to 131°F, No freezing

Operating ambient humidity

35 to 95 % RH (No condensation)


10 to 55 Hz, 0.7 mm 0.03" double amplitude, 20 times in each of the X, Y, and Z directions

Shock resistance

100 m/s2, 1,000 times in each of the X, Y, and Z directions


Case : aluminum, lens cover : polyarylate


Approx 300 g

*1 Mixed expansion at a 20 mm or 40 mm pitch is possible. The number of units that can be connected in a mixed expansion is 8 units or less.
*2 When the PJ-F41 / F42 has been added to the PJ-F20 / F21, the optical axis pitch of added unit is 40 mm 1.575", and 20 mm 0.787" when the PJ-F21 / F22 has been added to the PJ-F40 / F41.
*3 When performing mixed expansion at a 20 mm or 40 mm pitch, there is no limit on the number of axes if the number of connected units is 8 or less.
*4 With mixed expansion, this becomes 140 mm 5.512" [when the PJ-F20 is used] or 120 mm 4.72" [when the PJ-F40 is used] +20 mm 0.78" x (the number of 20 mm 0.78" pitch extension optical axes) +40 mm 1.57" x (the number of 40 mm 1.57" pitch extension optical axes).

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