Istec has a wide range of speed sensors and tachometers for speed measurements. By offering both hardware and flexible service, we offer the most complete solutions for reliable speed measurements.
Why speeds sensors and tachometers from Istec?
The reliability of a speed measurement is essential and depends on various factors. Based on decades of experience with speed measurements, we help customers choose and implement the right sensors and systems. Thanks to intensive cooperation with suppliers and a comprehensive stock management of sensors, we are able to achieve short delivery times.
Our range includes the three most commonly used measuring methods for speed measurements. Depending on various factors, we decide which sensor type is the most suitable solution for an application.
- Hall sensors
A Hall sensor is the most commonly used sensor for speed measurements. The output of these sensors is a square wave, as a result of which they suffer considerably less interference with the signal and the measurement has very high reliability. In addition, Hall effect sensors have a large speed range and can be used effectively for zero-speed detection and rotation direction detection.
- Electromagnetic (VR) sensors
Electromagnetic sensors have the strong property of being able to withstand high ambient temperatures. A disadvantage, however, is that minimum speed is required for these sensors to generate a usable signal and they are quickly affected by interference with the signal.
- Eddy current sensors
- Signal transmission: voltage
Three-wire connection – maximum cable length 300 metres.
- Signal transmission: current
Two-wire connection – maximum cable length 1000+ metres.
A major advantage of the two-wire version is that no separate power line is required for the sensor to work. As a result, standard cables can be used and the cables can be very long without affecting the measurement.
- Signal transmission: voltage
A disadvantage of the eddy current measuring principle can be that at high speeds due to saturation, the measurement signal becomes a straight line, making the measurement unreliable. This is countered by prior validation of the application.
The most used sensor that Istec uses is the DSF-1210SHV (Ex-ATEX) from Jaquet; a Hall-effect speed sensor with M12 x 1 thread. When a sensor needs to be replaced that has a larger diameter than M12, the mounting with a spindle can be made suitable for the sensor with M12.
There are other reasons for opting for a spindle solution, for example, for creating a phase shift to enable rotation direction determination. A spindle also ensures more accurate sensor positioning and simplifies the disassembly and assembly of the sensors, thereby reducing the risk of damage.
For applications where speed measurement with switching function is required, we offer three series of programmable tachometers.
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The T401 is a single channel tachometer and can be used for simple speed measurement with switching function. This tachometer is also available with a display like T411 for direct local reading.
The T501 is a two-channel tachometer and speed switch for complex measurement, control and monitoring applications. The high accuracy and fast response time makes this tachometer not only suitable for overspeed monitoring, but also includes acceleration monitoring as standard.
The most advanced tachometer is the T601. Just like the T501, it is a two-channel tachometer, but it contains many other functions such as rotation direction and creep detection. The T601 can also process temperature measurements from Pt100 sensors.
During a turnaround, the Istec specialists can offer service for speed sensors and tachometers. The sensors are disassembled, inspected and, if necessary, replaced.