juhala

Corrected: 

I suspect I need to use the switches (7-10 as my cable is attached to IN A+), but no matter which switch I turn on I don't see a difference.  

Hi again. 

I tried amplifying the signal in my output software, which unfortunately didn't work. 

Afterwards I connected you amplifier(LJTick-InAmp), which only enhances the offset as my software already did (+ 0.4mV), but the signal is just as weak and fluctuating as ever. 

I suspect I need to use the switches (1 -4 as my cable is attached to IN A+), but no matter which switch I turn on I don't see a difference.  

Do you have an idea what i could be doing wrong ? 

Picture of the setup is attachedd (switch 5 is turned on though it is difficult to see on the picture). 

Thank you very much for the answer.

In the H2S sensor software there is actually an option to change the analog output signal intensity. Currently my output is set at 100 mV and output for mV/unit is also 100. I will try and increase the output (mV/Unit) to see if that will decrease the noise, by amplifying the output signal .

Otherwise I can see that I will need to get some more gear.

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: 

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