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Conductivity/Resistivity Measurement


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3 replies to this topic

#1 BeeHay

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Posted 03 March 2010 - 09:45 AM

Hello again LabJack Techs!

I was just wondering if you have any experience with measuring Conductivity units?

If so, what probe would you recommend?

We recently purchased an LJTIA for use of an mA sensor, due to the fact we need
a fairly long cable.

We have tried mV probes with short cables, but success seemed unobtainable.

Deos this look like a good cell to use?

Signet 2850

Any advice in the right direction would be awesome!

Thanks!

#2 LabJack Support

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Posted 03 March 2010 - 10:11 AM

We recently purchased an LJTIA for use of an mA sensor, due to the fact we need
a fairly long cable.

We have tried mV probes with short cables, but success seemed unobtainable.

What do you mean by "mA sensor" and "mV probe"?


We don't have much experience with conductivity probes ourselves. In fact, what is the unit "uS" that is discussed in the datasheet you linked?



The probe you linked with 4-20 mA output looks fine. See Section 2.6.3.7 of the U3 User's Guide. Figure 2-5 is applicable here, but keep in mind the "max loop resistance" spec of your probe.

The LJTick-CurrentShunt is the easiest way to handle the 4-20 mA signal:

http://labjack.com/s...shunt/datasheet

Figure 6 of the LJTCS datasheet is applicable in this case.

#3 BeeHay

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Posted 03 March 2010 - 11:28 AM

Oops! I meant we just purchase the current shunt for this application... When I say mA/mV I meant milliamps/millivolts. :) uS is microSiemens. Thanks for the fast reply tho, just needed to ensure the CurrentShunt would work for that application. :) Thanks again!

#4 adrlabjack

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Posted 18 February 2015 - 02:16 PM

Did yuo find a suitable conductivity sensor/probe for labjack ?

 

Thanks

Adrian




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