Evacuate Dosing lines after a dose has been done?

[AZMSGT]

@Vinny@GHLUSA @Ditto

Is there a way to evacuate a Dosing line after you have dosed something with the Doser 2.1?

Similar to how the KH director doses the Sample line and then empties it.

 

[Member No 1]

@Vinny@GHLUSA @Ditto

Is there a way to evacuate a Dosing line after you have dosed something with the Doser 2.1?

Similar to how the KH director doses the Sample line and then empties it.

This was with a doser 2.0, might be able to adapt the program to a 2.1.
https://www.reef2reef.com/threads/ghl-doser-2-automatic-food-feeder-setup.269446/

 

[tdhnry]

The problem is that the Doser 2.1 doesn't have a reverse mode like the Doser 2.0 has.

 

[Dr. Jim]

The problem is that the Doser 2.1 doesn't have a reverse mode like the Doser 2.0 has.

The Doser 2.1 does have a reverse mode. In the DOSING TIMES box, check INDIVIDUAL. Then select NEW and when the box comes up you will see the REVERSE box that you can check

 

[tdhnry]

The Doser 2.1 does have a reverse mode. In the DOSING TIMES box, check INDIVIDUAL. Then select NEW and when the box comes up you will see the REVERSE box that you can check

Thanks for that. I thought when it says reverse isn't available I thought it was because of the feature set of the doser itself.

 

[Vinny@GHLUSA Verified Sponsor]

@Vinny@GHLUSA

Is there a way to evacuate a Dosing line after you have dosed something with the Doser 2.1?

Similar to how the KH director doses the Sample line and then empties it.

Yes, you can do this with the reverse dose feature.

*** Assuming the line starts empty ***
1. Use Individual mode
2. Set the first dose to be the amount you want to dose + the amount of ml held in the tube
3. Set the second dose in "reverse" and make that dose equal to how many ml are in the tube, it will clear out any undosed liquid.
4. Repeat steps 2 and 3 as necessary; on a P4 the manual dose limit is 24

The video linked above goes into more detail on how this feature can be used.

 

[Macca_75]

@Vinny@GHLUSA - if you run the lines in reverse does it add volume back into a monitored container so the level remains accurate?

 

[AZMSGT]

@Vinny@GHLUSA - if you run the lines in reverse does it add volume back into a monitored container so the level remains accurate?

Oh good question!

Say you have 100ml of Product X in a container
For instance your tank needs 25ml of product
You pump 29ml of product because your line holds 4ml and you pump 25ml
Then when the system evacuates the line that 4ml of product goes back to the container.
Will the end volume in the container be 75ml, 71ml or 67ml?

 

[Member No 1]

Oh good question!

Say you have 100ml of Product X in a container
For instance your tank needs 25ml of product
You pump 29ml of product because your line holds 4ml and you pump 25ml
Then when the system evacuates the line that 4ml of product goes back to the container.
Will the end volume in the container be 75ml, 71ml or 67ml?

Just guessing, but since this is not "dose, then reverse" program per say thru the P4 or SA 2.1, but rather individual dosing schedules the user set up, the doser doesn't care which way it's running but only how much was dosed.
Using your sample of 100ml, 25ml of product + 4ml for tubing, you set the dose to 29ml. Then the head reverses, the 29ml back into the container, so the container would now show 42ml. Again, I'm just guessing, I haven't tried it, but it would be nice it it did add it back.

 

[Vinny@GHLUSA Verified Sponsor]

At the moment, when the dose occurs the total dose amount is deducted from the fill container count. The reverse dose is not considered yet, but will be in a future update.