TM-804 Digital Panel Mount Tachometer with Photo-Reflective Sensor

Model Number – TM-804

A photo-reflective sensor in panel mount tachometer is a type of tachometer that uses a specialized sensor to measure the speed of a rotating object. The photo-reflective sensor works by reflecting light off the spinning object onto a light-sensitive surface. The light-sensitive surface measures the reflected light to calculate the speed of the rotating object. This type of tachometer is typically used to measure the speed of motors, engines, and other rotating objects.

Also Available at


Original price was: ₹3,480.00.Current price is: ₹3,000.00.

Shipping Timing: 2-5 Business Days.

Key Features

Used in industrial applications to monitor the performance of motors.

  • Full Digital, Micro Controller LSI circuit design for high reliability and versatility
  • Useful for measurements of RPMs of motors, mixtures, pumps and other rotary devices. With excellent Quality, compact size and accurate reading.


Working Principle

Employs the principle of photorefictive 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 processed / computed & RPM is displayed on panel meter.

Photo-Reflective Pickup

Photoprobe consists of threaded 22mm x 70mm 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”.


Technical Specifications


Ranges 60 RPM – 50,000 RPM
Resolution 0.1 RPM from 60 to 1000 RPM
1 RPM from 1000 to 50,000 RPM
Display Type 5 DIGITS 12.5mm(0.5”) height RED LED
Accuracy +/- 0.05 + 1 Least Count
Sampling Rate 1 Sample per second
Time Base Quartz Crystal Controlled
Power Source 220 Volts A.C. 50Hz +/- 10%
Panel Size 96mm x 48mm x 130mm (96mm Sq)
Standard Accessories Photo-Reflective sensor with 3.0Meter Shielded cable, 12x1000mm Photo reflective tape and instruction manual



Installation Diagram


Digital Panel Mount Tachometer with Photo Reflective Sensor



Photo Probe sensor


Digital Panel Mount Tachometer with Photo Reflective Sensor




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