Please help with drews doser from brs

[Miyagi570]

Can someone check my programing for my dosing pumps? I would like to dose 20 mls at 1.6 ml per min and would like to dose 50 times a day

I would like to start my alk at 12:00AM to 10:30AM

Fallback OFF
OSC 0:00/00:15/59:45 Then ON
If Time 00:00 to 10:30 Then OFF
If PH > 8.4 Then OFF

and cal at 12:00PM to 9:30PM

Fallback OFF
OSC 0:00/00:15/59:45 Then ON
If Time 21:30 to 12:00 Then OFF

[RussM]

Can someone check my programing for my dosing pumps? I would like to dose 20 mls at 1.6 ml per min and would like to dose 50 times a dayWould you please clarify? Do you really want 50 doses a day?

[RussM]

I would like to start my alk at 12:00AM to 10:30AM

Fallback OFF
OSC 0:00/00:15/59:45 Then ON
If Time 00:00 to 10:30 Then OFF
If PH > 8.4 Then OFF


First, the If Time is wrong... it needs to cover the time you do NOT want dosing to occur.

If Time 11:00 to 23:59 Then OFF

This probably want you want... this will result in hourly doses starting at midnight sharp and ending with the last dose at 10:00 - that's 11 doses per day.

Next... the OSC. 15 seconds for each of the 11 hourly doses equals 4.4ml/day. To get 20ml/day with 11 doses requires 68 seconds per dose:

OSC 000:00/001:08/058:52 Then ON


cal at 12:00PM to 9:30PM

Fallback OFF
OSC 0:00/00:15/59:45 Then ON
If Time 21:30 to 12:00 Then OFF

This would give you 10 doses. For the sake of simplicity, I'd suggest you stick with the same number of doses as with alk. That way the OSC statements can be identical. So, to get 11 doses/day on the opposite schedule from alk dosing, the If Time would be:

If Time 23:00 to 11:59 Then OFF

[Miyagi570]

Thanks so much Russ. I knew I had something wrong but i get so confused when programming OSC:confused:

[Crackem]

Are the Drews dosers 1.6 or 1.5ml/min because the boxes say 1.5 but everywhere I read it says 1.6

[Miyagi570]

your best bet is to test them. I've seen them pump 1 ml per min up to 1.6 ml per min