Can Someone explain? correct measurement?

[topStop]

This is the 1st day of trying to get things correct.
I've calibrated pumps 3-4 times and get the right calibration.
The length of tubes is like in video 17-16-16 cm
The sample tube is 267+12+16=295cm and its for 37ml. and i filled it put the end of a tube out of sump and measured and got 38 ml.
With both 37 and 38 ml I tried to measure twice and got 11.2 and 12.1 and with hanna I got 7 and with salifert near 7.
What I did wrong?
The thing is I put the volume tube 36 and got 10.
I've put 34 and got twice 8.3 and 8.5
with 33ml i,ve got 7,5 and its near correct to other measurements ( but for sure I've measured the volume of a tube one more time and got 38 ml)

 

[topStop]

the pump calibration
36 for the 1 sample
6 for the 2 reagent
37 for the 3 waste

 

[Lasse]

First - with 6 ml/min for pump 2. It seems a little bit high - normally (all doser 2 pumps I have calibrated at speed 0) it is between 3 and 4 ml/min.

I normally use a kitchen scale with 1 gram (or better) resolution and do 5 calibration runs in a row. Note and divide with 5.
I use the calibration fluid for calibrations. (use clean equipment - you can pour it back after calibration.)

Se here for properly calculate the sample tube length

5.2 Enter sample tube volume
The sample tube is automatically deaerated before a measurement. After the measurement, the water in the tube is pumped back into the aquarium. This ensures that a current measured value is always determined.
For that the KH Director requires the exact specification of the Sample tube volume. When calculating the volume, you are supported by a built-in tool. Just click on the calculator next to the input field for the Sample tube volume. Enter the total tube length (including the sample tube between the KH Director and the dosing pump and including the tube length of
the dosing pump which is 12 cm / 4.2” ) that you have connected and confirm with OK. The tube volume will automatically be taken over.
HINT
If you use an inline filter in the sample tube, its volume must be added.
The GHL inline filter has a volume of 7 ml.
Example: The tube had a volume of 10 ml - then a sample tube volume of 17 ml has to be entered.

Sincerely Lasse

 

[topStop]

Thx for advise with syringe from hanna I got 4,3 ml. Just put out of vial by one after another

 

[arking_mark]

Unfortunately, the KH Director is a laboratory grade device that requires laboratory grade calibration. That being said, once you get it there, it works very well.

How do you know its calibrated correctly? Well, you can look at how much waste is collected. If it doesn't add up correctly, something was not calibrated precisely. Its not written anywhere, but you can monitor the pumps as they operate. For my setup that has a sample tube and filter volume of 40ml and sample size set to 65ml, it performs as follows:
1. The sample pump will pull in volume + 12ml to prep the test chamber. 52ml for me.
2. The waste cannot be measured by pump and only puts out about 10ml. (If you manually run the pump, you can squeeze out the 1-2ml of fluid that I believe is the wetness of the initial rinsing)
3. Then the sample pump pulls in sample volume. 65ml for me.
4. Then the reagent pump pulls 1-2ml
5. The waste pump dumps everything
6. The sample pump reverses and empties the sample tube volume

In the end you should have wasted 12 + sample volume + reagent volume. Or for me 12 + 65 + ~2 or 79ish.

My issues with precise calibration was with the sample tube and filter volume. The sample tubing was not fully emptying at the end of the cycle so I was ending up with extra sample water. The culprit is the filter. Depending on how it is installed will change the volume it accounts for. Its best to install vertically.

I found that the best way to calculate the volume is to measure it.
1. Unplug the sample tube from the KH Director
2. Run the sample pump until it is dumping water. (Simulates the initial draw)
3. Then calibrate the pump (might as well)
4. Then run the pump in reverse with the other end of the sample tube now into a graduated cylinder until its out of water. This simulates the clearing of the sample tube. That volume is the sample tube and filter volume. Your thinking why can't I just run the pump forward into a graduated cylinder to get the volume? Its because the direction of the filter will effect its ability to be

 

[arking_mark]

It also takes 2-3 measurements before the KH Director provides accurate results. This is mostly do to the calibration of the unit. If you calibrate your reagent pump with the actual reagent (which I do) then when you plug it back in the initial draw won't be quite right. If you calibrated your PH probe and put it in a little wet, things will be a little off.

Currently, my unit is within .1 of my Hanna tester and I'm betting the GHL is the more accurate reading.

 

[topStop]

hope I will be with U Luck and exp. thx

 

[topStop]

Thx a lot with the help think will get right measurements

 

[topStop]

Can U help with wifi.
Ive made wifi client and now I can connect through internet with GHL connect to my doser?
Or how it work?

 

[Vinny@GHLUSA Verified Sponsor]

@topStop
Instructions for connecting the Doser to your Wi-Fi network can be found in the Knowledge Base:

How to connect GHL Doser 2.1 SA to your network (Wi-Fi) - GHL Advanced Technology

www.aquariumcomputer.com

 

[arking_mark]

I'm not sure what you're asking help for. Here is the link to GHL's manuals.

Downloads - GHL Advanced Technology

www.aquariumcomputer.com

 

[topStop]

just w8ing my dosser to connect my wifi. Then I understand how to get to it from inet %)
the last question Cn I see yesterday measurements of Kh and where?

 

[Lasse]

Just did a post in your other thread


Sincerely Lasse

 

[topStop]

@topStop
Instructions for connecting the Doser to your Wi-Fi network can be found in the Knowledge Base:

How to connect GHL Doser 2.1 SA to your network (Wi-Fi) - GHL Advanced Technology

www.aquariumcomputer.com

The dosser does not connect wifi