Introduction

Where an alternative to a reed switch output is required, which is classified as simple apparatus as it has no energy storing components, it can be input to rate totalisers as part of their Intrinsically Safe certification.

Two Hall Effect Sensors are available which are certified either Intrinsically Safe to ATEX, CSA and IEC Ex or Explosion Proof / Flameproof to ATEX / IEC Ex standards. The output from these optional sensors is a 0-5 Volt TTL output.