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Understanding the importance of safety integrity level ratings

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article image Limitorque MXa actuators now SIL3 Certified
According to exida, the certification company that recently awarded Acrodyne 's Limitorque MXa actuators its SIL 3 rating, certification is an earned credential resulting from third party assessment process.

The certification process is said to demonstrate mastery, competency and conformance that is measured against a set of requirements.

A Safety Integrity Level (SIL) is a measure of the overall safety function, safety system performance, or probability of failure on demand (PFD) for a Safety Instrumented Function (SIF) or Safety Instrumented System (SIS). Simply put, the higher the SIL level, the lower the probability of failure on demand for the safety system and the better the system performance.

Obtaining a SIL capable certification for devices is important to both safety engineers and end-users for a number of reasons.

Achieving a SIL rating means the product or device:
  1. has passed rigorous failure mode effects design analysis (FMEDA)
  2. provides customers reliable actuation in critical and extreme environments without compromising their Safety Instrumented Systems (SIS)
  3. provides uncompromising reliability and performance
  4. complies with world utilisation standards
Acrodyne's Limitorque MXa actuators are non-intrusive, double-sealed smart electronic actuators.

The MXa actuators are widely accepted and used in the following industry sectors:
  • power generation
  • oil and gas
  • water and wastewater treatment
The Limitorque MXa actuators offer a number of benefits including:
  • Redundant absolute encoder with B.I.S.T. - never needs batteries
  • Graphical dot-matrix display allows 180-degree rotation of text, diagnostic graphs and supports 11 languages
  • Torque ranges from 27Nm. to 2,306Nm
  • IP68 Submersion 15 metres for 96 hours
  • Double-sealed terminal block compartment prevents moisture ingress into controls enclosure
  • Available with arctic temperature to -60°C and solid-state starter options
The actuator's LimiGard technology and design of the encoder was the key to achieving the SIL 3 rating. It automatically monitors the health of each coded signal and ensures that no component failure can cause the actuators to move unexpectedly.

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