Photoelectric Speed Sensor For Panel Tachometers

• Target Distance: 0.1" (3mm)
• Maximum Speed: 6,000 RPM (100Hz)
• Includes 6' (1.8m) cable
• Power: 12-24 VDC +/-10%; 40mA Max
• Response Time: <1ms
• Output: NPN transistor; Max load 80mA
• Photo Beam Color: Green
• Photo Beam Wavelength: 5500 Angstroms

Mounting:

• Use the mounting holes to secure the photoelectric sensor to the desired surface
• The photo beam is generated and detected in the groove
• The object under test must pass in the groove so that the light beam can be interrupted
• See additional pictures for a diagram

Wiring:

• Brown wire connects to terminal 3 of the panel tachometer
• Blue wire connects to terminal 1
• Black wire (sensor output during high to low transition) or Green wire (sensor output during low to high transition) connects to terminal 2
• Connect one wire only to terminal 2 (black or green) depending upon which better suits the application

Operation:

• Photoelectric Sensor Model 461957 Extech Photoelectric Sensor Model 461957 connects directly to the tachometer's input terminals and measures up to 6,000 RPM (100Hz)
• When the sensor is properly powered (by the voltage on terminal 3 of the meter), the green power LED (on the sensor) will switch on
• Photoelectric sensors generate a light beam that is interrupted by an object as it passes through the beam
• Each time the beam of light is interrupted a pulse is transmitted to the meter and the red status LED on the sensor blinks
• The meter then calculates and displays the RPM based on the number of pulses received in a specific period of time
• The sensitivity adjustment screw on the sensor may have to be adjusted so that one pulse is generated for each interruption of the light beam
• If the red LED turns on less/more than once for each interruption of the beam, adjust the sensitivity screw