Is GHL dosing pump accurate?

[Khanh]

Hi,

I’m running Kamoer F4 dosing pump but the accuracy is very bad. Checking every few days and always lower 2% to 8%

I’m now thinking about GHL doser. Does it have stepper motors? Is it accurate?

Please give me your review/advice

Thanks in advance

 

[Saltysav96]

i bought a used ghl doser off here over 2 years ago and its still running strong. a little noisy and could use new heads but it doesnt bother me as it still gets the job done.

best thing about the GHL pump is being able to replace/rebuild the heads and not have to buy a whole new doser.

 

[Lasse]

best thing about the GHL pump is being able to replace/rebuild the heads and not have to buy a whole new doser.

The electronic and the stepper motor last for ever but the tube, rollers and cover needs to be replaced sometimes - and if it is very important with the accuracy - the tube have to be replaced at least every 6 months IMO.

Sincerely Lasse

 

[Khanh]

i bought a used ghl doser off here over 2 years ago and its still running strong. a little noisy and could use new heads but it doesnt bother me as it still gets the job done.

best thing about the GHL pump is being able to replace/rebuild the heads and not have to buy a whole new doser.

Do you check the accuracy?

 

[Khanh]

The electronic and the stepper motor last for ever but the tube, rollers and cover needs to be replaced sometimes - and if it is very important with the accuracy - the tube have to be replaced at least every 6 months IMO.

Sincerely Lasse

Do you mean it has stepper motors?

 

[Borat]

Do you mean it has stepper motors?

Most basic dosers would have normal DC motors..

If your doser feels heavy (quite heavy) - it may be stepper driven..

 

[Borat]

i bought a used ghl doser off here over 2 years ago and its still running strong. a little noisy and could use new heads but it doesnt bother me as it still gets the job done.

best thing about the GHL pump is being able to replace/rebuild the heads and not have to buy a whole new doser.

Most dosers' heads are replaceable..

 

[MaddyP]

Do you mean it has stepper motors?

Yes, the GHL Doser 2.1 uses stepper motors.

 

[Member No 1]

GHL Doser 2.1 – GHL (International)

www.aquariumcomputer.com

The 24V stepper motors allow precise dosing even at the smallest flow rates (0.1 ml).

• Up to 150 doses per day
• Easily chose dosing times via software (GHL Control Center).
  Automatically: Up to 150 individual doses per day automatically distributed
  Individually: Up to 8 doses per day individually set
• Each pump can be set separately
• Conveying capacity and dosing:
  8-45 ml / minute (precisely adjustable to 0.1 ml)

 

[Lasse]

Do you mean it has stepper motors?

Yes Doser 2 and 2.1 have stepper motors

sincerely Lasse

 

[Khanh]

Thanks so much for your information

 

[t5Nitro]

I really like my doser from GHL. Need another one. Also nice that its a standalone unit not requiring the whole controller system.

 

[Khanh]

I really like my doser from GHL. Need another one. Also nice that its a standalone unit not requiring the whole controller system.

Do you check the accuracy?

 

[t5Nitro]

I dont. Chemistry is stable.

 

[Member No 1]

Do you check the accuracy?

Khanh, the 2.1 doser is used on the KHD and now the IOND, and both of these require precise dosing in order to obtain accurate and repeatable results. The KHD uses very small, incremental amounts of reagent in it's testing process to measure the pH of the sample water which is how it calculates the dKh.
So based on my personal results, and the accuracy and repeatability of my KHD, I would wager the 2.1 doser is very accurate.

 

[Khanh]

Khanh, the 2.1 doser is used on the KHD and now the IOND, and both of these require precise dosing in order to obtain accurate and repeatable results. The KHD uses very small, incremental amounts of reagent in it's testing process to measure the pH of the sample water which is how it calculates the dKh.
So based on my personal results, and the accuracy and repeatability of my KHD, I would wager the 2.1 doser is very accurate.

Thanks so much for your explanation

 

[friendlyguy]

I run mine (i have 2) since almost 2 years AND check accuracy "kind of" regularly. I am more than statisfied with it. I only ever need to recalibrate when i changed something around my tubes. I dose amounts as low as 0.8 ml up to 290ml. Mine does make a squeaky noise as well, i dont like that. But since it sits in a cupboard i am not too bothered by it. I have replacement stepper as well as the plastic "covers" with balls: though i never had to replace so far.

 

[Khanh]

I run mine (i have 2) since almost 2 years AND check accuracy "kind of" regularly. I am more than statisfied with it. I only ever need to recalibrate when i changed something around my tubes. I dose amounts as low as 0.8 ml up to 290ml. Mine does make a squeaky noise as well, i dont like that. But since it sits in a cupboard i am not too bothered by it. I have replacement stepper as well as the plastic "covers" with balls: though i never had to replace so far.

Thanks for your review

 

[ChuckTownReefer]

You can also change the speed of how fast it doses the set amount.