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Reliability

What does reliability mean to us?

Every encoder we design is built to last. We put the product through tests that go far beyond normal operating conditions.

How far?

One good example is that we operated a SiGNUM™ readhead at temperatures down to -95 °C (-139 °F), then added 20 g vibration just for good measure. Such tests prove the mechanical and design integrity of the product. Of course, we do not do that to every product before it leaves the factory, but instead each one undergoes a 137 point check to make sure it will not let you down. No wonder our failure rates are so low, and our product is used in so many reliability-critical applications where failure is not an option.

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Advanced optical design

All Renishaw incremental encoders feature unique filtering optics for high immunity against dirt, scratches and light oils that can make other encoders miscount. ATOM, TONiC and SiGNUM readheads augment this with dynamic signal conditioning, including Auto Gain Control (AGC) and Auto Offset Control (AOC) for even greater performance on dirty scale.

High-flex, UL-approved cables

Renishaw cables are specially designed for use in highly-dynamic applications, involving rapid moves and constant flexing. Under such demanding conditions, the encoder cable must perform faultlessly for many years. Renishaw use only cables that meet our stringent acceptance criteria, such as the TONiC cable that we specify for 20 million flex cycles at 20 mm bend radius.

Materials

There is no need to put up with fragile glass scales. Renishaw make some of the world's highest accuracy scales, yet uniquely we graduate directly onto tough engineering materials such as ZeroMet and hard martensitic stainless steel. Not only does this enable much easier handling during installation, but it also ensures far greater resilience to damage in service.

Total quality assurance system

All key manufacturing stages, from PCB assembly and machining of bodies to cable assembly and final readhead assembly / test are carried out in-house. Unlike many other encoder companies, our scales are also made in-house. This philosophy ensures we maintain total control of product quality at every step.

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Fully CE approved

There are two levels of CE approval for noise immunity - all Renishaw readheads achieve the more stringent EN 61326-1:2013 level, which ensures the readhead does not miscount under even the harshest RFI conditions.

Comprehensive warranty

In the unlikely event that something does go wrong, you'll be fully supported by Renishaw. With wholly-owned sales offices in every major industrial country in the world, our trained technicians can help fault-find your machine, no matter where it is located.

If a Renishaw encoder is at fault,we will replace it right away, investigate the failure and send you a comprehensive and honest report into exactly what happened, why it happened and what we have done to ensure it never happens again.

High reliability light sources

Renishaw encoders use only highly-reliable LED light sources. Under continuous operation, however, all LEDs tend to exhibit natural degradation and reduction in light output over extended periods of time.The TONiC readhead is an excellent example of how Renishaw guard against this; any reduction of light output is compensated by a DC light servo which monitors the light output and adjusts the LED brightness accordingly.