Jebao DP-4 Dosing Pump Calibration HELP!!!

[Reeftang]

So for more then a day now im trying to calibrate my pumps, the problem im experiencing is that the pumps will stop before 100ml and reach the max of 250 turns for the calibration process.

WHAT AM I DOING WRONG?

 

[saltyfilmfolks]

Not sure what’s going on there.

Possibley air inthe line ?

Have you looked at this one?

 

[Reeftang]

Not sure what’s going on there.

Possibley air inthe line ?

Have you looked at this one?

Watched this sure.

 

[chipmunkofdoom2]

If the unit is brand new, you may want to consider returning it. Mine range from 210 to 244 turns for 100ml. It's odd that your heads are not dispensing 100ml in 250 turns, and this shouldn't be happening on a new pump. If the unit is old, try replacing the heads and see if that helps performance. Also check to make sure that there are no splits in the tube inside the head. Make sure the hose connections are good and that no air is getting into the dosing tubing, and that no liquid is leaking out.

If the heads are new and everything appears to be in good working order, try stopping the calibration at 50ml instead of 100ml. This will cause the pump to dose half of the liquid you're expecting. The end result is just that you will need to double any scheduled doses. If you have a head that is supposed to dose 20ml for instance, you would need to tell the doser to dispense 40ml.

 

[Reeftang]

If the unit is brand new, you may want to consider returning it. Mine range from 210 to 244 turns for 100ml. It's odd that your heads are not dispensing 100ml in 250 turns, and this shouldn't be happening on a new pump. If the unit is old, try replacing the heads and see if that helps performance. Also check to make sure that there are no splits in the tube inside the head. Make sure the hose connections are good and that no air is getting into the dosing tubing, and that no liquid is leaking out.

If the heads are new and everything appears to be in good working order, try stopping the calibration at 50ml instead of 100ml. This will cause the pump to dose half of the liquid you're expecting. The end result is just that you will need to double any scheduled doses. If you have a head that is supposed to dose 20ml for instance, you would need to tell the doser to dispense 40ml.

It's all new, funny thing is that I calibrated it once and it did work, then I wanted to calibrated again and it didn't reach 100ml it's as if when its turning for a long time it stretches the lines inside the head causing it to be off does that make sense, because the same thing happened by the second head.

 

[chipmunkofdoom2]

It's all new, funny thing is that I calibrated it once and it did work, then I wanted to calibrated again and it didn't reach 100ml it's as if when its turning for a long time it stretches the lines inside the head causing it to be off does that make sense, because the same thing happened by the second head.

The tubing can stretch to some extent, but I'd be really surprised if the effect of that was so great that your pumps can no long dispense 100ml in 250 turns. I've built a few DIY dosing pumps with cheap commodity peristaltic pumps. The tubing remains remarkably accurate over its working life. Typically the hose splits before I notice the tubing stretching out and affecting the dose quantity.

If I had to guess, I'd say your problem is more likely that the rollers inside the head are slipping/catching, or that the motor that drives the pump is going bad. My doser came with a few extra dosing heads, did yours? If so, try swapping out one of the "bad" heads for one of the spares. If that solves the problem, then the issue has something to do with that specific head.

It's worth noting that I've had my Jebao doser going for over a year and a half and I haven't had any significant drift in calibration. You mention your pump is fairly new. If it's "very" new, I'd consider contacting the seller for a replacement or a warranty claim. These issues can likely be solved, but you shouldn't be having these types of trouble with the pump if it's as new as you say.

 

[Reeftang]

The tubing can stretch to some extent, but I'd be really surprised if the effect of that was so great that your pumps can no long dispense 100ml in 250 turns. I've built a few DIY dosing pumps with cheap commodity peristaltic pumps. The tubing remains remarkably accurate over its working life. Typically the hose splits before I notice the tubing stretching out and affecting the dose quantity.

If I had to guess, I'd say your problem is more likely that the rollers inside the head are slipping/catching, or that the motor that drives the pump is going bad. My doser came with a few extra dosing heads, did yours? If so, try swapping out one of the "bad" heads for one of the spares. If that solves the problem, then the issue has something to do with that specific head.

It's worth noting that I've had my Jebao doser going for over a year and a half and I haven't had any significant drift in calibration. You mention your pump is fairly new. If it's "very" new, I'd consider contacting the seller for a replacement or a warranty claim. These issues can likely be solved, but you shouldn't be having these types of trouble with the pump if it's as new as you say.

It's brand new first time setting this up. I just tried reversing the set up inside the head like this video, and it did help I reached 100ml with 220 turns, however when I did a test run for 15ml it overdosed.

 

[Reeftang]

This video () seemed to do the trick in the end and it worked on every single head. I'm still going to order a new one just to make sure my motors are not worn out. So I basically inverted the setup of the rollers in the head.

 

[Simply__J]

Having the same issue, did you end up ordering a new one? Or did the flip of rollers work out for you?

 

[Reef man 89]

Having the same issue, did you end up ordering a new one? Or did the flip of rollers work out for you?

I just bought one and was having the same problem but once I saw this video I had to change my around as well now works great

 

[Simply__J]

I just bought one and was having the same problem but once I saw this video I had to change my around as well now works great

It finally came around after I flipped the rollers, manually purged/primed the lines then calibrated.

 

[Reef man 89]

It finally came around after I flipped the rollers, manually purged/primed the lines then calibrated.

Did you test it after calibration? Even after I calibrated mine say if I were to dose 10ml I get around 13ml have you noticed this with yours?

 

[Simply__J]

Did you test it after calibration? Even after I calibrated mine say if I were to dose 10ml I get around 13ml have you noticed this with yours?

Actually I did it recently. (As I started dosing AcroPower in addition to my 2-Paet) I break my dosing up in 5ml parts and it was pretty spot on. The one that gave me issues was the 3rd pump but I purged/primed the lines a couple of times making sure there were none to minimum air bubbles and it's worked out so far. But I'm also running the longest distance from the doser to the tank using silicone lines as opposed to the regular airline tubing or rigid R/O lines. I don't know if that has any effect on accuracy.

 

[Zeal]

Posting for reference