Frozen check

The Frozen Check detects when field equipment is "stuck" recording the same value.

This check applies to data at all granularities.

The following algorithm is used to detect if the sensory equipment is frozen:

Where:

• Valt = The most recent measurement data at time t.

• Valt-n = Measurement data n scan intervals ago.

• n = Number of user configured consecutive readings.

• Tol = Tolerance (% error) acceptable for the data check If the algorithm returns a true condition, an alarm and an event are generated. If the check fails, a frozen failure problematic context is generated. The processing continues if the outcome is true or false.

The Frozen Check is configured in the Validation Summary.