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Veeder-Root Sensor Application Guide Appendix B <br />Appendix B - How To Order An Oil/Water Separator Sensor (OWSS) <br />Sensor Sizing <br />To determine the correct sensor length for the oil/water separator tank application use the manufacturer's tank chart to <br />determine height - to - volume thresholds for warning and alarm conditions and make three measurements, including <br />verifying fluid depths on the manufacturer's tank chart. <br />1. Determining The Lowest Point Of The Bottom (Alarm) Float <br />Measure and record the distance from inside the top of the tank to the maximum depth of waste oil/water interface in <br />the tank as recommended by the tank's manufacturer (see Fig.13-1). Subtract 3 inches from this measurement to <br />determine the lowest permissible point in the tank for the centerline of the sensor's bottom (alarm) float and note <br />this measurement as D1. <br />CL of the lowest point <br />of Bottom (Alarm) <br />Float (down position) <br />The tank manufacturer's <br />recommended maximum <br />Oil/water interface depth <br />2. Determining Distance From Top Of Riser To Top Of Tank <br />Measure from the top of the riser down to the top of the tank and if using the riser reducing 4x2 fitting note this mea- <br />surement as D2. OR, If using the riser reducing 4x2 coupling add 3" to the measured distance and note this mea- <br />surement as D2. <br />B-1 <br />If using a 4" to 2" <br />.- <br />reducing fitting <br />riser adapter <br />Top of O/W <br />(example at right) <br />Sensor's riser <br />to top of tank <br />djust <br />no height adjust- <br />ment <br />ment is needed to <br />1 <br />D2 <br />measurement D2 <br />t , <br />If using a 4" to 2" <br />reducing coupling <br />riser adapter <br />(example at right) <br />add 3 inches to <br />_ <br />the results of <br />measurement D2. <br />Distance D2 <br />B-1 <br />