¶ Recirc Flow Meter
The Recirc flow meter monitors the total flow of water circulating through the Recirc Pump line. To configure or view the settings, access the Recirc flow parameters via the Main screen (Image 1.1) or the menu screen (Image 1.2).
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¶ Recirc Flow settings
The values entered in the Recirc flow settings are the parameters that the PLC will use to monitor and control the recirculation pump system (image 1.3). These settings ensure proper operation by providing the necessary data for the PLC to manage flow rates and respond to system conditions effectively.
¶ Recirc Flow Data
At the top of the screen (image 1.4), the PLC displays the total gallons recorded by the Recirc flow meter, representing the cumulative volume that has passed through the Recirc pump line. The “since” date indicates the last time the total was reset; pressing the “Reset Flow Total” button will reset the gallons count to zero and update the “since” date to the current date shown on the HMI.
Additionally, the Non-Resettable Total gallons counter continuously records the total volume pumped by the station over its entire lifetime, and this value cannot be reset.
¶ Low and High Flow fault limits and delays
The low and high flow limits are safety and diagnostic thresholds designed to alert the PLC to potential issues with the Recirc pump system. Both settings monitor flow in GPM and include a timer delay to prevent false alarms (image 1.5).
Low Flow Fault: The system will only fault and stop the Recirc pump if the flow remains at 0 GPM or less continuously for 120 seconds. Until this time elapses, the pump continues to run despite low flow conditions.
High Flow Fault: The system will fault and stop the pump if the flow exceeds 3000 GPM for a continuous 60 seconds. Once the delay expires, the pump is shut down to prevent damage or system issues caused by excessive flow.
These thresholds help ensure the Recirc system operates safely and efficiently by detecting flow anomalies and acting accordingly.
¶ Pulse Scale and Analog Full 20mA scale
Omnia supports monitoring station, fill, recirc, and well flow meters that output pulse or analog mA signals. For pulse meters, follow the manufacturer's instructions to determine the flow meter’s k‑factor (pulses per gallon). Enter this value into the Pulse Scale setting.
Next, zero the mA Scale—this activates the pulse measurement mode. If the mA scale is not zeroed, pulse readings will not function correctly. Once configured, the system converts incoming pulses into flow rates, displaying the flow in GPM on the main screen of the HMI (Image 1.6).
The Analog Full 20mA Scale should be set to match the maximum flow rating of the flow meter’s 20mA output. This value typically represents the highest flow the meter is rated to measure. For meters with adjustable 20mA span, verify that this scale matches the configured maximum output value on the flow meter to ensure accurate readings and proper system calibration.
