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The Atlas Ultrasonic Flowmeter uses the latest in ultrasonic technology to measure water flow. The technology uses sensors that communicate with each other using ultra-sonic sound that travels through the Flowmeter pipe. This allows for accurate and reliable means to measure flow without any mechanical wear or fatigue. This module, in connection with the UV system, will allow for the UV system to enter Energy Saver Mode by dimming the UV lamp when no water is being used after a period of time. This will reduce energy costs associated with running the UV system, and prevent over heating of standing water in the UV chamber during no-flow conditions. Once water flow is present the UV system immediately exits Energy Saver Mode. The Atlas Ultrasonic Flowmeter incorporates an internal fail-safe in the case any failure occurs to make sure that the UV system is properly treating the water at all times. When the Flowmeter is connected and active on a UV system, a new flow screen will appear after the home screen. This flow screen will display the current flow rate in the controllers programmed flow-units, the status of the UV lamp (Full Power or Energy Saver Mode) or Flowmeter error. Each FLOWMETER is calibrated to achieve accurate and reliable flow readings. Re-calibration is not needed annually unlike other mechanical Flowmeters but cleaning is recommended on an annual basis to reduce scaling to maintain accuracy over the device’s lifetime.