Output signals of a PH controller with U3-LV

5 posts / 0 new

Wed, 02/09/2022 - 04:09

sim

Good morning,

I would like to know if it is possible to connect an output signal of +-5V or 4-20 mA to some terminals of the LabJack U3-LV. The pH controller (HI 8711 from HANNA) has these two outputs options and I wanted to use it with the LabJack to visualize the values of the pH in the computer. I think that I have to connect it to a FIO terminal. I would really appreciate your feedback. Thanks in advance.

Wed, 02/09/2022 - 15:15

LabJack Support

It appears the 5V output is

It appears the 5V output is only a power supply, so you will need to use the 4-20mA output. To monitor this current signal from the U3 you will need some additional conditioning. We would recommend using our LJTick-CurrentShunt accessory:

https://labjack.com/accessories/ljtick-currentshunt

Our measuring current application note has some other relevant information:

https://labjack.com/support/app-notes/measuring-current

The connection to the FIO is correct, but you will need some conditioning as previously mentioned, and you must ensure the FIO is set to analog for your readings. How you do this could depend slightly on the software you use. What software are you planning to use?

Thu, 02/10/2022 - 01:16

sim

Thank you so much for your

Thank you so much for your quick answer.

I was planning in using the UD software that you provide, but maybe I will need to use it with Python.

Any recommendations for this? Thanks in advance.

Thu, 02/10/2022 - 10:26

LabJack Support

If you just need simple

If you just need simple logging and "real time" graphing, our LJLogUD or LJStreamUD are great options. We recommend using LJLogUD when possible, it is most suitable for acquisition that is slower than 100 samples per second. LJStreamUD is for higher rates. Either logger will automatically configure the channels you sample as analog. LJLogUD and LJStreamUD are Windows only software. Additional information can be found on our U3 software options page:

https://labjack.com/support/u3-software-options

We support Python with the U3 on Windows, macOS, and Linux. The following page has related information:

https://labjack.com/support/software/examples/ud/labjackpython

Fri, 02/11/2022 - 00:31

sim

Thank you for your amazing

Thank you for your amazing support.

I will try it with the LJLogUD. I will come back to you if I have more questions.

Best regards.