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U3-LV with KTA-260 for temp. measurement

U3LV Temp K Type

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#1 Tejas Patel

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Posted 26 May 2015 - 06:22 PM

Hi All, I am new to labjack. I want to measure one temp. from k-Type tc with Labjack U3LV and KTA-260. I installed Daqfatory to my PC which is trial version. Now is any body can help me how to start?  Do any body has similar example? Please let me know. Many thanks in advance.....



#2 LabJack Support

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Posted 27 May 2015 - 07:10 AM

Information regarding how to configure a U3 to collect thermocouple readings is available in the device agnostic thermocouple app note as well as the U3 specific thermocouple app note.  One requirement for the U3 to read thermocouples is a LJTick-InAmp (or some other amplification circuitry) as noted on the U3 specific thermocouple app note page.  The U3 also does not have a CJC so if you want this ability you will also need an LM34.



#3 LabJack Support

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Posted 27 May 2015 - 07:10 AM

The KTA-260 uses I2C communication:

 

http://labjack.com/s...rs-guide/4.3.11

 

We do not have an I2C U3 example posted for DAQFactory:

 

http://labjack.com/s...ples/daqfactory

 

... but if you search "I2C DAQFactory" you do get some hits from our forum that might be useful:

 

http://labjack.com/search

 

 

Actually, it looks like Ocean Controls provides a DAQFactory example:

 

https://oceancontrol...au/KTA-260.html



#4 Tejas Patel

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Posted 27 May 2015 - 05:39 PM

Thank you very much for reply and links... I will try with this...

 

Now if i have only one tc measurement and two pt for pressure measurement, can this attached prog be use with modification. See the attached file and give your views..

 

Attached Files



#5 LabJack Support

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Posted 28 May 2015 - 07:04 AM

We do not have the most expertise with I2C in DAQFactory.  Does your ctl work?  Does it give errors?

 

What sort of pressure sensors do you have?



#6 Tejas Patel

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Posted 02 June 2015 - 07:11 PM

Sorry for late reply. Now I want to measure/run One Temp. (K type) + Two Pressure measurment (Dwyre) + One Mass flow controller (Bronkhorst) with my present U3LV and KTA-260 set up.

Can i use U3Lv for the above three application OR I need some more hardware? Please guide me. If you have example, please give me links.. 

Many thanks for help.



#7 LabJack Support

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Posted 03 June 2015 - 08:50 AM

Tell us more about your analog signals.  What voltage span do you expect from the pressure sensors and MFC?  Perhaps post links to technical details for the sensors.



#8 Tejas Patel

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Posted 03 June 2015 - 11:13 PM

I have One MFC Bronkhorst..which has 24VDC input which i am giving from seperate power supply. Now its output is 0-5VDC. (Model of MFC is F-201CV-100-AAD-22-Z).

And Two Pressure Transmitter are of Dwyer. both has input 0-5VDC and output 0-5VDC.

I am also attaching my trial programm...I know its Blank..but...I need some hint to start..

Thanks..

 

Attached Files



#9 LabJack Support

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Posted 04 June 2015 - 01:47 PM

The max voltage for all analog inputs on the U3-LV is 3.6 volts:

 

http://labjack.com/s...users-guide/2.6

 

To measure voltages beyond 3.6 volts, you need to use a couple resistors to make a voltage divider or use an LJTick-Divider:

 

http://labjack.com/s...s-guide/2.6.3.6

 

... or just keep the output of your sensors below 3.6 volts.

 

As for measuring the voltage signals in DAQFactory, that is quite straightforward:

 

http://labjack.com/s...j-app-guide/3.1

 

http://labjack.com/s...-quick-tutorial

 

If you want to use the "Special 0-3.6 volt" range, rather than the default 0-2.4 volt range, see the following:

 

http://labjack.com/s...j-app-guide/3.2



#10 Tejas Patel

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Posted 04 June 2015 - 05:13 PM

If you have programme / code for the same, pl send me..

Also note that I want to use all these three measurements from One programme/code (Labjack U3 LV+KTA-260 + LJ Tick Divider...may i will buy this).. 
OR you may add in my above programme...Test 06..

Cheers..have a wonderful weekend..



#11 LabJack Support

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Posted 05 June 2015 - 04:21 PM

We don't  have an example that does just this, but adding analog inputs is very simple.  First just start with a blank CTL, or go through the tutorial linked in post #9.

 

What you will actually do to get your desired application, is start with the example that reads from the KTA-260, and then just add the analog inputs to that, since adding analog inputs is very simple.



#12 Tejas Patel

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Posted 24 June 2015 - 11:18 PM

I need just three analog input (vlues to be display) {all are 0-5VDC} One from MFC actual flow with respect to set point. And two values comes from two pressure transmitter which shows pressure in the system...

Now I got two LJTik divider with Labjack U3LV. how should i start...?



#13 LabJack Support

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Posted 25 June 2015 - 10:18 AM

First I would use the test panel in LJControlPanel to make sure you can read the voltages correctly.

 

Then close LJCP, and to measure the voltage signals in DAQFactory start with the following:

 

http://labjack.com/s...j-app-guide/3.1

 

http://labjack.com/s...-quick-tutorial




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