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The TQ902/TQ912, EA902 and IQS900 form a proximity measurement chain, from product line.

TQ9xx-based proximity measurement chains allow contactless measurement of the relative displacement of moving machine elements, and provide an output signal proportional to the distance between the sensor tip and the target.

Accordingly, these measurement chains are ideally suited for measuring the relative vibration and axial position of rotating machine shafts, such as those found in steam, gas and hydraulic turbines, as well as in alternators, turbocompressors and pumps.

A TQ9xx-based proximity measurement chain consists of a TQ9xx proximity sensor, an optional EA90x extension cable and an IQS900 signal conditioner, configured for a particular industrial application.

The EA90x extension cable is used to effectively lengthen the front-end, as required.

Together, these form a calibrated proximity measurement chain in which each component is interchangeable.
The IQS900 signal conditioner is a versatile and configurable device that performs all required signal processing and generates the output signal (current or voltage) for input to a machinery monitoring system.

In addition, the IQS900 supports optional diagnostic circuitry (that is, built-in self-test (BIST)) that automatically detects and remotely indicates problems with a measurement chain.