Why might a water sampler turn on but fail to collect a sample? How can this be fixed?
Try the following steps:
Remove the intake hose from the intake volume control tube.
Perform a manual sample.
Check all air hose connections to ensure that there are no loose fittings or leaks.
Check the meter chamber cover lid for proper connections. Ensure that everything is correctly installed and that the O-rings are in place.
Verify that the pinch bar on the discharge tube is closing properly and not allowing vacuum or purge leakage.
Check the solenoid valves on the pump to see if they are purging or vacuuming at the air tube connection of the metering chamber.
If air is not purging and vacuuming from the tube at the metering chamber connection, remove the solenoid valves from the pump, and check for air pressure at the pump output port.
If air pressure is present at the pump output port, replace the solenoid valves with pn 27893.
If no air pressure is present at the pump output port, either rebuild the pump (if it is a large pump) with the rebuild kit pn 28620, or replace the pump (if it is a small pump).