How to add fail safes to ATO coding

[ajs2294]

Hi guys,

I'm running two optical sensors with a solenoid on a gravity fed RO reservoir. I tested this out in the Red Sea Reefer reservoir for a little while but now I have removed the reservoir above the sump. I'm looking to add some fail safes to the following string of code;

Fallback OFF
If TO_LO OPEN Then ON
If TO_HI CLOSED Then OFF
If Salt < 34.7 Then OFF

thank you!

[rkpetersen]

You should have a Min Time command to keep it from filling too often, and also a When On command to keep it from filling too long at any one time. In my case, these are:

Min Time 030:00 Then OFF (means it will stay off for a minimum of 30 minutes regardless of what the sensors say.)

and

When On > 002:00 Then OFF (means it will turn the solenoid OFF and keep it off until you manually turn it back to AUTO, if it is ever open for longer than 2 minutes at a time.)

When using the When On command, adding the line 'If Error ATOSolenoid Then ON' to your email alarm code will notify you when the ATO has been turned off due to having pumped for too long.

Every set up is different so you will need to adjust the numbers to suit your situation.
Also, you should typically use a Set OFF command right after the Fallback OFF, so that the water level cycles around your low level sensor. When doing this, the high level sensor then becomes another failsafe.

[ajs2294]

Thank you for this!

I really need to divulge deeper into the alerts as a whole. I never quite got mine right and seem to get loads of unnecessary alerts.