CVS 7970 - Pressure Sensing High - Increasing (PSH) Schematic

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Instructional Schematic: Pressure Sensing High – Increasing (PSH)
Normally Open – Loss in Instrument (output) pressure, when sensed inlet pressure increases above the
high pressure setting.
Gaining Pressure
Inlet Pressure Applied
Unactuated - Monitored process control pressure is applied,
but is BELOW the high pressure setting. Normal operation.
Reducing Pressure
Inlet Pressure Applied
Actuated – Monitored process control pressure has
INCREASED ABOVE the high pressure setting.