The Panasonic CX-491 Retroreflective Sensor  (CX491, UCX491), with part number UCX491, is a compact, high-performance retroreflective photoelectric sensor, optimized for detecting opaque, translucent, or specular objects at distances up to 3 meters when used with the RF-230 reflector. It achieves a repeatability of 0.5 mm (perpendicular to the sensing axis), ensuring precise and consistent detection.
Operating on 12–24 VDC, the sensor features an NPN open-collector output (100 mA max sink current), with switchable Light-ON or Dark-ON operation and built-in short-circuit protection. Its fast 1 ms response time makes it ideal for dynamic applications.
An orange LED indicates output status, while a green LED confirms stable sensing. It includes a continuously variable sensitivity adjuster and an automatic interference prevention function, enabling reliable use even with multiple units installed close together.
Built for industrial durability, the CX-491 offers IP67 protection, vibration and shock resistance, and operates in temperatures from –25°C to +55°C. Its rugged PBT housing and 2-meter cabtyre cable ensure dependable field performance.
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3 m 9.843 ft
(Note) The sensing range and the sensing object of the retroreflective type sensor are specifi ed for the RF-230 reflector. The sensing range represents the actual sensing range of the sensor.
Sensing Object
Ø50 mm Ø1.969 in or more opaque, translucent or specular object
(Note) The sensing range and the sensing object of the retroreflective type sensor are specifi ed for the RF-230 reflector. The sensing range represents the actual sensing range of the sensor.
(Note) Make sure to confirm detection with an actual sensor before use.
Repeatability (Perpendicular to Sensing Axis)
0.5 mm 0.020 in or less
Hysteresis
-
Supply Voltage
12 to 24 V DC plus or minus 10 % Ripple P-P 10 % or less
Current Consumption
13 mA or less
Output
NPN open-collector transistor
- Maximum sink current: 100 mA
- Applied voltage: 30 V DC or less (between output and 0 V)
- Residual voltage: 2 V or less (at 100 mA sink current), 1 V or less (at 16 mA sink current)
Output: Output Operation
Switchable either Light-ON or Dark-ON
Output: Short-Circuit Protection
Incorporated
Response Time
1 ms or less
Operation Indicator
Orange LED(lights up when the output is ON)
(incorporated on the receiver for thru-beam type)
Stability Indicator
Green LED(lights up under stable light received condition or stable dark condition)
(incorporated on the receiver for thru-beam type)
Power Indicator
-
Sensitivity Adjuster
Continuously variable adjuster(incorporated on the receiver for thru-beam type)
Automatic Interference Prevention Function
Incorporated(Two units of sensors can be mounted close together.)
Protection
IP67 (IEC)
Ambient Temperature
- 25 to +55℃ -13 to +131℃ ℉ (No dew condensation or icing allowed ), Storage: -30 to +70℃ -22 to +158℃ ℉
Ambient Humidity
35 to 85 % RH, Storage: 35 to 85 % RH
Ambient Illuminance
Incandescent light: 3,000 lx or less at the light-receiving face
Voltage Withstandability
1,000 V AC for one min. between all supply terminals connected together and enclosure
Insulation Resistance
20 MOhm , or more, with 250 V DC megger between all supply terminals connected together and enclosure
Vibration Resistance
10 to 500 Hz frequency, 1.5 mm 0.059 in amplitude (10 G max.) in X, Y and Z directions for two hours each
Shock Resistance
500 m/s2acceleration (50 G approx.) in X, Y and Z directions three times each
Emitting Element (Modulated)
Red LED
Emitting Element (Modulated): Peak Emission Wavelength
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