¶ Station Flow Meter
The station flow meter monitors the total volume of water passing through the main discharge line. To view or configure this flow meter, access the flow settings via the Main screen (Image 1.1) or the menu screen (Image 1.2).
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¶ Flow settings
The values entered in the flow settings (image 1.3) are the parameters that the PLC will use to monitor and control the pump station operation. These settings ensure accurate flow measurement and proper system response to flow conditions.
¶ Flow Data
At the top of the screen, the PLC displays the total gallons that have flowed through the station’s main flow meter (image 1.4). The “since” date indicates the last time the total flow was reset; pressing the “Reset Flow Total” button will reset this gallon count to zero and update the “since” date to the current date shown on the HMI.
Additionally, the Total Gallons Non-Resettable totalizer continually records the total volume of water pumped by the station over its entire operational lifetime. This value cannot be reset and provides a permanent record of total flow.
¶ Low and High Flow fault limits and delays
The low and high flow limits act as diagnostic thresholds to alert the PLC of potential issues with the station, preventing damage or inefficiency. Both limits monitor flow in GPM and include a timer delay to avoid false alarms (image 1.5).
Low Flow Fault: The station will only fault and stop if the flow remains at 1 GPM or less continuously for 120 seconds. Until that time, the station continues to run despite low flow conditions.
High Flow Fault: The station will fault and shut down if the flow exceeds 3000 GPM for a continuous 60 seconds. After the delay, the station will stop to prevent possible damage caused by excessive flow.
These thresholds help maintain safe and reliable operation by detecting abnormal flow conditions 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.
