GENERAL DESCRIPTION & OPERATION The Cleveland Controls AFS-952 Differential Pressure Sensing Switch is designed to provide precise operation and convenient features for industrial and commercial air handling applications. The AFS-952 can monitor positive, negative, or differential pressure (flow) of air and noncombustible gases, and is commonly used to monitor combustion air, furnace pressure, ventilating blower operation, inflatable structure pressure, fume hood operation, bag house air flow, dirt accumulation in air filters, and heat-transfer air flow. The AFS-952 has a field adjustable set point range of 0.05" W.C to 12.0" W.C with an 8 second (± 3 seconds) time delay relay sequence. The time delay prevents nuisance shutdowns due to normal draft fluctuations. APPLICATIONS The most common specific application for the AFS-952 is as a Low Draft (Negative Pressure) Cutoff Safety Switch for combustion draft control systems. The general applications of the AFS-952 are: Low Positive Pressure Cutoff. (Shutdown upon insufficient pressure.) Low Negative Pressure Cutoff. (Shutdown upon insufficient draft.) Low Differential Pressure Cutoff. (Shutdown upon insufficient difference between two samples.)
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