Mc Propeller Flow Meter With Pulse Transmitter For SCADA System Data Logging and Telemetry
October 3, 2016
Agriculture and turf irrigation engineers will find the EA631 Pulse Transmitter for the Mc® Propeller Flow Meter from McCrometer provides an interface to Programmable Logic Controllers (PLC’s) in support of Supervisory Data Acquisition (SCADA) Systems useful in irrigation control systems.
The EA631 is a three-wire pulse transmitter, which is is available with all models of the Mc Propeller Meter or can be easily retrofitted into an existing Mc Propeller meter. Installation of the EA631 does not require removal of an existing flow meter and can be done under flowing conditions. This wafer-style transmitter produces a pulse output that can be used for data logging or telemetry.
The Mc Propeller Meter is available in various mounting configurations such as bolt-on saddle, flanged, grooved, plain and threaded-end. The meter’s flow range is 40 to 30,000 gallons per minute depending on line size, under pressures up to 150 psi and a continuous operation temperature up to 160°F maximum. It features liquid flow measurement accuracy of ±2% of rate and repeatability is ±0.25%.
With its high accuracy, the Mc Propeller Meter is a water management tool that helps reduce water costs, prevents over-irrigating and reduces leaching of chemicals and fertilizers into the ground. The Mc Propeller is especially well suited for dirty irrigation water flows, and other high-volume water applications.
Unlike traditional propeller meters, the Mc Propeller uses a flexible drive-train and sealed ball bearings. Its unique design makes it easy to service in the field and requires no external power or batteries. The Mc Propeller is designed to comply with AWWA C704-08. Standard features include an instantaneous flow rate indicator and six-digit totalizer.
The Mc Propeller consists of a rotating device, a helical-shaped impeller, positioned in the flow stream. When fluid passes through the meter, it contacts the impeller causing it to spin. The impeller’s rotational velocity is directly proportional to the velocity of the flow. The rotation is translated through a magnetic coupling and flexible drive system to the register, which calculates the flow rate by multiplying the flow velocity with the cross-sectional area of the meter tube.