Expandable Area SensorPJ series


Base Unit

[Discontinued model]

This model has been discontinued.

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Base unit

No. of beam axes


No. of connectable units

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

Beam axis spacing

40mm 1.575"*2

Maximum optical axis number

32 (PJ-F40 × 1 + PJ-F41 × 7)*3

Detection area

120 mm 4.72" (4 optical axes) to 1,240 mm 48.82" (32 optical axes)*4

Detecting distance


Detectable object

Opaque material with a diameter of 48 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



4-core shielded cable (0.5 mm2), length : 7 m (for the PJ-L**C, this is a 0.3 m cable with connector), gray sheath


4-core shielded cable (0.5 mm2), length : 7 m (for the PJ-L**C, this is a 0.3 m cable with connector), black sheath


Use a shielded cable with a nominal cross section of 0.5 mm2 or more to extend the cable by up to 20 m for both the transmitter and receiver.

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.

115 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 1,230 g*5

*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 0.78" or 40 mm 1.57" 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 5.51" [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).
*5 This is the weight including the 7 m cord.

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