Photo-Reflective Sensor

Photo Reflective Sensor in India


Photo-Reflective Sensor


Photo reflective sensors are optical sensors that are used in tachometers to measure the rotational speed of a motor or shaft. The sensor consists of an LED, a light-sensitive detector, and a light-reflecting surface. When light from the LED strikes the light-reflecting surface, the light is reflected back to the detector. The detector then measures the light level and, based on the period of time it takes for the light to be reflected back, calculates the rotational speed of the motor or shaft. This type of sensor is used for accurate and reliable speed measurements and can be used in a variety of industrial and commercial applications.

Employs the principle of photoreflective scanning using a light source,photo sensor & reflector. The Visible light beam through photo-probe is to be aligned with the reflector (applied on rotating shaft/disc/drive) at 4” to 12” distance. The receiver senses the reflected light beam each time target passes through light beam. Time interval between reflected light which is proportional to speed is transmitted to the panel instrument over the interconnecting 3 core cable .

Photoprobe consists of threaded 22mm x 75mm long brass chrome plated probe with locknuts. It houses light source of bright intensity with a photo receiver. A quality optic lens is mounted inside to focus the light on reflector and to send back reflected light from reflector. 3 wire cable has been provided to transmit signal. Photo sensor has to be mounted perpendicular to reflector at a distance of 4” to 12”.

A Man Explaining the Structure of a Machine to Women and the Second Image is Industrial Interior Structure

Specifications: Electronic

Supply Voltage

5V DC (Regulated).

Supply Current


Output Type

Digital Pulse Output – 3 Wire

O/P Pulse Rate

1ppr (Pulses per Revolutions)

O/P Pulse Amplitude

+50 mV to 5 V.

O/P Frequency

20 KHz @ 10000 RPM.

Outlet Cable

2/3 meter long (Standard) with three cores along with connector.

Specifications: Mechanical

Mechanical Body

Machined BRASS/SS threaded housing with two locknuts.


Face – by 2 locknuts of M22

Overall Size

Body dia.22 mm, Length: 75 mm.


150 gram.

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