PADDLE WHEEL FLOW METERS Flow meters for liquid flow applications. Jewel bearings allow for very low minimum flow rates. Easy to install and operate. Mounted horizontally or vertically. Only one moving part. Flow indication via transparent acrylic cover. Versatile square wave flow output signal. Female NPT ports. Multiparameter: flow and temperature *outputs. Four wires platinum RTD option. Polypropylene and chemically resistant PVDF models. * PWM provides only raw pulse output signals. In order to get actual flow and temperature readings, user has to implement additional signal processing. Fluid flowing through the unit causes the paddle wheel to spin. As the magnets embedded in the paddle spin past the sensor, electrical pulses are produced in which frequency is proportional to the flow rate. The number of pulses per desired time interval and the K-factor (number of pulses/gallon) make it is possible to calculate the flow rate and volume passing through the unit. TABLE 30 - FLOW RATE FOR PWM TABLE 32 - PADDLE WHEEL MODEL NUMBERS METER SIZES Inlet/Outlet Ports Female NPT Max Pressure Drop POLYPROPYLENE TABLE 33- WETTED MATERIALS OUTPUT SIGNAL NPN open collector (load 30 mA max). PADDLE WHEEL PVDF 56H x 108L x 53D [mm] (2.2 x 4.25 x 2.2") Without RTD and flow sensors. Nickel Tungsten Carbide Zirconia Ceramic Sapphire Jewels Sapphire Jewels Flow signal 1.8 m (6') or optional 3.7m (12') [ft.] RTD 12 [in.] long cable. Platinum 0.00385 TCR, meets EN 60751, Class B. POLYPROPYLENE MODELS PVDF UNITS MODELS 55 www.aalborg.com - e-mail ౧ [email protected] - ( 845.770.3000 - fax 845.770.3010 - Toll Free in U.S.A. and Canada 1.800.866.3837