Technical Blog

Rotary position sensor

Many industries rely on the use of sensors for various applications. Rotary position sensors for example, are largely responsible for converting the rotational mechanical displacement of a machine. The electrical signals created by the sensor is then interpreted and translated into readable data. In


Many industries rely on the use of sensors for various applications. Rotary position sensors for example, are largely responsible for converting the rotational mechanical displacement of a machine. The electrical signals created by the sensor is then interpreted and translated into readable data. In many ways, the invention of sensors has revolutionised machines. Modern uses of rotary sensors include robotics and consumer electronic products.

Rotary position sensors are categorised as either an absolute rotary sensor or an incremental sensor. An absolute rotary position sensor retains the same position information even when power is removed from the system. Inversely, an incremental rotary encoder can record changes in displacement and location.

Positek's rotary position sensor

Positek uses a patented inductive sensor technology in fabricating rotary position sensors. Our brand of rotary position sensors and linear position sensor has unmatched accuracy and life cycle. It will be difficult to find an rvdt sensor that performs with the same accuracy. All of our rotary sensors are non-contact. This means that they are more durable against regular wear and tear and can perform even in the most extreme conditions. This is one of the reasons why our sensors are preferred for industrial applications with exposure to hazardous substances.

Working principle and uses of rotary position sensors

A rotary position sensor works by measuring an object's angle in relation with its position. The object or device is connected to the sliding element of the rotary sensor. When the device is in motion, the slider attached to the sensor corresponds to the movement in order for the resistance between the stationary point and slider to change. To measure the displacement, the voltage adjustment corresponds with the change in the movement of the object.

Positek's rotary sensors are used in applications that require position sensing. Some basic examples include car steering wheels, industrial valves, medical equipment, and robotic arms. With our angle sensor and linear transducer patented robust fabrication, each application is guaranteed with accurate measurement and years of use.

Angles of measurement and other parameters

There are several parameters used in identifying a specific type of sensor suited for each application. With our wide range of sensors, you can select the best fit sensor by narrowing your options using the following parameters:

Measurement type- linear, rotary, or tilt

Measurement range- millimetres, inches, or degrees

Intrinsic safety requirement- ATEX, IECEx, CSA

Type of hazardous environment- Gas and Vapour, Dust, Mining

Environmental sealing- IP67, IP68

Each of these parameters help distinguish whether a certain type of sensor can be used in extreme conditions. For example, intrinsic safety is required for sensors that will be used in mining. Our intrinsically safe sensors comply with ATEX, IECEx, and CSA requirements. You can also select sensors from our inventory that are suitable for working environments exposed to volatile gas and vapour.

The degree of measurement of our rotary position sensors varies depending on the size of the sensor itself. To illustrate further, our miniature rotary position sensors measure displacement from any angle between ±15° to ±70°. For our slim-line sensors, the range of angle measurement is between ±7.5° to ±80°. On the other hand, large position transducers can measure at an angle from ±8° to ±80°. Our submersible rotary transducers are suitable for consistent underwater use and has a measuring range from ±7.5° to ±80°.

Advantages of buying from Positek

Our commitment to making sure that each of our products meet all quality standards put Positek sensors on the frontline of the market. Our 25 years of experience in manufacturing and innovating sensor technology is another testament to the quality of our sensors.

Another advantage of buying Positek sensors is the ability to request for customisation. Other suppliers and manufacturers may not be able to fabricate a sensor that will suit your required specifications. If you can't find the exact sensor you are looking for from our inventory, you can speak to one of our dedicated specialists to manufacture your desired sensor. In addition to this, we also ensure that our customers no longer need to wait long to receive their orders. Sensors can be dispatched within 1-2 days from that date of purchase. This means you can have your machine in working condition within a short amount of waiting time.


Article published on: 09/07/2018