Calibrating using scales

[Whostheduke]

Hi guys,

When using high precision scales to calibrate the 2.1 doser, what weight equals what volume of water?

For saltwater at 1.025, I think 100g = 97.5ml?
Freshwater must be 100g = 100ml?
And the reagent - what does 100ml weigh?

Bonus question - when re-calibrating the reagent pump, do you need to de-prime the head before disconnecting the tube?

Thanks,

Alex.

[AQUA-digital]

god question. :-) i wanne do the calibration also bei mg and not anymore bei ml.

[JaviVG]

Hi.
I don´t think so much level of accuracy would be necessary, for example the temperature of the tubes can fluctuate the amount of water and reagent. In summer they are longer. Well i think so.

[Vinny]

The weight difference won't matter much as long as you tare first with the weight of the measurement cup.
Tare, calibrate and enter amount dispensed into the flow rate box.

[AQUA-digital]

hello, i test the reagent in a laboratory. it is nearly the same like water. 100ml =99.8g :-)

[Philipp]

There are a lot of things that impacts.
Density, Specific gravity, hight difference, tube diamater, Position of the peristaltic rolls, temperature, back pressure, transfer speed
But why to overthinking?
We didn't whant to use this pumps as Medical device. I know what I speak about ��

[AQUA-digital]

on the KHD it is importend, if it is 3,0 or 3,4 ml/min.

[Whostheduke]

OK, thanks everyone.

My other questions was when re-calibrating the reagent pump, do you need to de-prime the head before disconnecting the tube?

[Vinny]

The only head and tubes that should remain primed is the reagent head with reagent fluid.

All others should be emptied before reconnecting to the KHD.