The authors regret that there is a flaw in the circuit described in Section 3.3 and depicted in Figs. 7 and 8 of the manuscript. This design bypasses the Schottky diode and risks exposure of the relay control board to voltage spikes caused by the deactivation of the sampling solenoids.
To correct this issue, we recommend that the circuit be updated as follows:
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1.
Ensure all equipment is powered off.
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2.
Remove the black wires connecting the solenoids to the negative (-) rail of the connection board.
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3.
Reconnect the black wires from the solenoids to a connection on the cathode side of the diode. In the example below we use contacts in column C for this connection.
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4.
Using a 2 cm length of black wire, bridge the connection between the cathode side of the diode and the negative (-) rail of the connection board. In the example below we use the contact in column A to make this connection.
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5.
Repeat steps 3 and 4 for each solenoid pair.
Fig. C1.
The previous incorrect circuit configuration (from Fig. 8, steps 5 and 6 of the original manuscript; left) and the corrected circuit configuration (right), for one solenoid pair.
The authors would like to apologise for any inconvenience caused.