Tachometer is a tool for measuring the speed of the engine, disc, fan blades and که, which measures the rotation speed based on the RPM unit per unit and other related units. Tachometers in mechanical and Digital optics (formerly magnetic or purely mechanical) are used to measure the number of revolutions of various rotating electrical devices, such as electric motors, and so on. The application of these telemeters, which are made digitally and accurately today, in various industries such as machine building, repair and construction of heavy and semi-heavy vehicles, manufacturing of air conditioning fans, home appliances, measuring the speed of various centrifuges. Industrial and laboratory, exploring the performance of gasoline or diesel engines and so on.
Types of telemeters
Today’s tachometers are intentionally made digitally with optical and mechanical sensors. In the following, we will examine the performance of each with an example.
- Mechanical telemeter
- Optical odometer
- Strobe scope
This device measures the number of engine speeds or any other rotating device in three different ways. Mechanically – optical and laser
For mechanical measurement, a shaft or cone must be installed on the deviceOdometerOrTachometer Connected to the motor shaft to rotate and the number of revolutions of both reach the same size or so-called synchronize. Look at the number displayed on the device at this time. The number of revolutions displayed is equal to the number of engine revolutions.
Optical measurement is that a marker or nozzle is mounted on the shaft or impeller and the tachometer is held close to it or placed by rotating the motor and passing each time the mark is mounted on the shaft or impeller of the counter motor. The device calculates one cycle and after a few moments when the engine reaches its nominal speed, the number of revolutions can be recorded.
In the third method, which is laser, it is enough to record the laser light of the device on the shaft, body or blade of the device and record its number of rounds and use it.
In some of the existing devices, the measurement of the measured data is done by the device itself and only by connecting to the computer, you can receive the recorded data in the form of an Excel file or a chart.
To select Telemetry device Properly, you should pay attention to a number of points.
The first point is the number of rounds of devices that you want to operate Tachometer Do.
Second point: the appropriate method for measuring
The third point is the accuracy of the device in measuring the number of revolutions and the resolution of the telemetry device. This point is important because it is not suitable for laser measurement for low counts and has a high error, and the appropriate method for this type of measurement is optical and mechanical. Also, for measuring high number of revolutions, the best method is laser and node measurement method, because it is possible to increase the number of revolutions of the device.Odometer Injured and injures the operator. This method has a relatively high risk and may cause injury to the technician or operator.
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