FAQ

|Flow Switches

What does it mean when “HHH” is displayed on a PF□ series digital flow switch (“---” for a PF2□)?

As this indicates a “flow error,” lower the flow rate when this is displayed. When the flow rate is returned to within the rated flow range, the unit switches from the error display to the flow rate display. If the error does not disappear after returning to the flow rate range, foreign matter or moisture may have adhered to the sensor or the sensor or circuit board may be damaged. Perform inspection as needed.