VSioP Installation and Operation Instructions ACI/SPT, ACI/VPT 2305 Pleasant View Rd. Middleton Industrial Park Middleton, WI 53562 PH: (608) 831-2585 FAX: (608) 831-7407 II-61 ACIutomationomponentsnc. Important!PLEASE READ THE FOLLOWING INFORMATION BEFORE INSTALLING n MOUNTING & LOCATION INFORMATION Select a position that is 5 to 8 diameters downstream from elbows, obstructions, or large changes in duct area.Insert the probe into the duct so that it is perpendicular to the airstream. The Aspiration or Static probe tipshould open parallel with the airstream. The Impact or Total Pressure probe tip should open directly into theairstream. The following diagrams show some of the locations for the ACI/SPT and ACI/VPT. The numbers byeach of the pressure switches correspond to the the following notes below the picture. These drawings will showsome of the most common applications for both the Differential Pressure Switches and the Pitot or Pick upTubes. Applications #1, #2, and #3 Air Flow Direction Fan Unit 3 1 2 Air Filter Air Duct Differential Pressure Switch Air Flow Direction 1 Positive static pressure increases as the filter gets dirty2 Differential across filter changes as the filter gets dirty3 Flow is reduced as the filter gets dirty. 4.60” 4.02” 1 ½” Round Aluminum Mounting Flange ¼” I.D. Tubing Connectn Air Flow Direction (4) 0.180” Mounting Holes ACI/T (Static or Aspiration Pressure Probe) ACI/PT (Velocity or Impact Pressure Probe) 4.60” 4.02” 1 ½” Round Aluminum Mounting Flange ¼” I.D. Tubing Connection Air Flow Direction 1.00” 2305 Pleasant View Rd. Middleton Industrial Park Middleton, WI 53562PH: (608) 831-2585 FAX: (608) 831-7407 II-62Application #4 Application #5 Air Flow Direction Fan Unit4 Air Duct Air Flow Direction Fan Unit5 Air Duct 4 Fan Operation or True Air Flow with little or no Static Pressure5 Fan Operation and True Air Flow; Varying amounts of Pressure. Probe must be perpendicular to Air Flow Differential Pressure Switch Differential Pressure Switch Damper Application #6 Fan Unit 6 Air Filter Air Flow Direction 6 Negative Pressure Increases as the Filter gets Dirty. Pressure Conversion Table 1” w.c. = 0.0361 psi or 0.0735” Hg. 1” Hg. = 13.6” wc. or 0.491 psi1 psi = 27.7”wc. or 2.036" Hg.Next >