Are BRS Dosers accurate?

[PirateLove]

I just turned my doser on for 10 min, into a cup in my sump, to see how much it would dose. After the 10 min it was a hair over 20ml. Shouldn't it be only 11ml for ten min??

 

[thegrun]

They are not that accurate. I have three and they all dose at slightly different rates. Local power supplies also differ which will change the speed the pump runs at.

 

[Rx79394]

Yes- based off of the advertised rates, then 10 mins should produce 11ml.

If they are not accurate, yet precise (consistent)... then you should be good. use the dosing at 2ml/min.

Never had any experience with the BRS dosers btw.

 

[PatW]

As RX said, as long as they are consistent, they are fine. Just let it them fill up a calibrated container. Then you know the run rate of each. You will know how long to dose each pump.

 

[billdogg]

^^^What they said^^^

IME, any and all pumps of that type should be calibrated. I usually go for a larger sample - say 30 minutes or even an hour, then divide the volume by the number of minutes to figure out the actual rate. You should repeat the test a couple times a year as well. Considering the price point of 99% of whats available, I wouldn't really expect them to all be the same.

 

[Reef Frog]

^ Good idea to test calibration a few times per year. The tubing can get harder over time and this may affect output volume over time. It's cheap to replace if needed.

 

[Zirco]

I just calibrated my two brand new BRS dosing pumps yesterday and both seemed to run at about 56 ml over 30 minutes (1.9 ml/min).