Hi
I've encountered a problem that I hope someone can help me out.
Im working with hydrogen sulfide (H2S), which is administered by a peristaltic pump, and is set adjust concentrations over a period of 24 hours. I use a microsensor to measure H2S, which provides me values in mV, which range from 1.5 mV-10. This output signal is obviously quite low, so I use a LabJack U3 LV and adjusted my H2S sensor offset to be at 100 mV.
However, when applying my conversion based on y= Mx + b, I get large variations in Value, even - values. I currently take the average H2S(0) [0,10], but my values still fluctuates, despite my sensor measurements are quite stable.
My three point measurements for conversion of values with D-A input, offset at 100 mV gave be the following:
µmol/L
Volt
0
0,088
3,5
0,113
6,3
0,13
with the equation for conversion of mV to the units of µmol/L as y = 149,25x - 13,201
How can I stabilize my input signal, and e.g. ignore negative values so the output my pump is relying on becomes more steady?
Thanks in advance.
Sincerely,
Julie