gINT Hydrometer Analysis

[caddyr2]

Has anyone used gINT software to report a hydrometer analysis? I am having a question on the hydrometer calibration function.

 

[jdonville]

I've done it.

Jeff

 

[caddyr2]

Here is my question. I need to add a 151H to the list of hydrometers it appears because the only hydrometer on their list is a 152H. When I go into Data Design:Library Tables to setup a new hydrometer it asks for calibration intercept and calibration slope. Any help on what those are or where to find them or how to calibrate my hydrometer to get these?

 

[jdonville]

caddyr2,

Find the ASTM Standard for hydrometers (was in one of the Volume 14s, IIRC). If you don't have a copy, buy it via download from

http://www.astm.org.

The calibration procedure is given in that standard.

I don't manage a soils lab anymore (moved companies, too), so I no longer have access to that information.

Basically, you account for temperature differences in the hydrometer reading using a standardized solution.

Jeff

 

[caddyr2]

Thanks, I'll have to buy that copy because unfortunately we don't have that one. I did find in the gINT help what to enter in that field although it took some searching. Correct me if I'm wrong but from what I understand from reading old notes from college is that I have to take two temperature differences using my 40g/L sodium hexametaphosphate sol. and graph the readings and use that slope and y intercept to determine my calibration intercept and calibration slope. I wonder where the makers of gINT got the information for the 152H hydrometer that was already loaded into my computer... Thanks for the help.

 

[jdonville]

caddyr2,

You may want to check the initial calibration for the 152 that came with gINT, and make corrections if warranted.

Jeff