The Levelstate Type 202 from HMA INSTRUMENTATION is an approved electronic alternative to the gauge glass, providing a significant improvement in accuracy, visibility, and safety, enabling transmission of the water level condition to a remote display, in addition to the application of alarm and control functions. It includes connections for two separate mains supply inputs to achieve ultimate security and reliability for indication and control functions.

A total of 12 or 14 probes are spaced vertically in a sidearm water column that is attached to the boiler drum, with each probe connected to its own sensing circuit. The results are displayed on local area remote displays. The probes are spaced in the water column in order to suit the entire site range.

System fault: A system fault yellow LED is activated through one SPDT sealed relay for the following abnormalities: Any power supply/internal power pack failure; a probe channel malfunction by validation between adjacent channels.