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Inclinometer and accelerometer

SIL2- and PLd-certified CANopen sensors

The QG series by DIS Sensors now complies with safety levels SIL2 and PLd. The series includes inclination and acceleration sensors that communicate via CiA 304.

Certification of safety levels opens up additional applications (Photo: DIS Sensors)

Increasingly stringent regulations are forcing a wider range of equipment and devices to comply with the safety levels SIL2 (as per IEC 62061) and PLd (as per ISO 13489). This makes it necessary to use components that have been certified to at least this safety level. DIS Sensors recognizes this need, and has extended the QG series with CANopen Safety sensors with built-in redundancy for safety-critical applications. The certification applies to QG series inclinometers and accelerometers.

Inclinometers measure the angle of inclination on one or two axes. DIS inclinometers are based on the MEMS technology. Due to their modular design, these sensors are adapted to meet specific requirements. It is also possible to adjust the sensors as required through CAN commands.

Accelerometers measure acceleration in one, two or three axes. These sensors are likewise based on the MEMS technology. The difference to the inclinometers is the wider bandwidth, enabling this type to measure faster movements, and with greater precision. These sensors are therefore suitable for applications such as vibration measurement for maintenance purposes, or for active vibration compensation.

Safe variants: SIL2 and PLd

The availability of ‘safe’ variants of the QG sensor series has increased the range of potential applications. Moreover, the components are certified as compliant with both SIL2 and PLd. Each of these standards aims to quantify the relative level of risk reduction of a machine or installation. Given its relatively simple approach, most machine builders prefer the PL system (Performance Level as per ISO 13489). SIL (Safety Integrity Level as per IEC 62061) has more variables and complex formulas, but it is more comprehensive, especially in the area of documentation and data registration. This can be beneficial to management aspects for example, or the compilation of a functional safety plan.

Safety is ensured through features such as the redundant (dual) functionality, communication via the CANopen Safety protocol EN 50325-5 (CiA 304), and continuous verification of correct operation of all components. All models are available in a standard housing of reinforced plastic or optionally a stainless steel housing. In addition, the sensors are supplied with a M12 terminal (IP67) or a cable exit gland (IP68). The sensors can also be supplied with two M12 terminals to enable a looped network design.


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DIS Sensors