The relay logic based alarm annunciator systems are preferred in applications where extreme environmental conditions are encountered. The combination of proven reliability, noise immunity and simplicity of the logic circuits makes the relay system ideally suited for applications on oil platforms, desert or arctic environments, shipboard, or any place with limited technical support. The alarm modules feature normally open/normally closed field contact selection, auxiliary contact outputs, lock/non-lock selection, and are available in all major ISA 18.1 sequences, as well as a number of custom sequences
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