Non-contact IR temperature sensor working with LJ U3HV

7 posts / 0 new

Sat, 03/17/2018 - 11:57

antonio o. monge

Hi all, I need to measure the temperature up to 500 C of a piece of plastic sheet. It has to be with a non-contact IR temperature sensor. I am thinking using my LJU3 for this purpose. I found this kind of sensor (link below) suitable for this temperature measurement. My doubt is how to connect the sensor to my LJ and make the readings properly with accuracy. I think I might need some additional hardware as the LJTick-Resistance. Has someone experience with this?

Thanks.

In this link the T sensor: http://www.omniinstruments.co.uk/pyrocouple-compact-non-contact-temperat...

Mon, 03/19/2018 - 15:01

LabJack Support

The easiest option is going

The easiest option is going to be to use the sensor with 4-20 mA output and just add an LJTick-CurrentShunt to your U3:

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

If you go with either of the voltage output versions you would want to add an LJTick-InAmp to your U3, or better yet move up to a U6 or T7 which can measure those small voltages directly.

You will have to provide the 24 volt power supply for the sensor.

Thu, 10/29/2020 - 02:31

Tasos

Hi, I just bought the U3-LV

Hi, I just bought the U3-LV and i want to measure the temeprature of a bicycle chain on a chain testing machine. I would like to connect a non-contact IR temperature sensor and i am probably gonna use the https://www.omniinstruments.co.uk/pyrocouple-compact-non-contact-tempera... as mention.

From what i have seen from this forum, i have to use the https://labjack.com/support/datasheets/accessories/ljtick-currentshunt connect the sensor on it and supply it with 24v with an external power supply?

If someone has worked with IR sensors and U3 before i would appreciate an answer before ordering anything.

Thu, 10/29/2020 - 10:34

antonio o. monge

Hello Tasos, I did follow the

Hello Tasos, I did follow the indications of Labjack support, buying the LJTick-InAmp connected to LabjackU3. I used the non-contact temperature sensor of the omniinstruments, and the aditional power supply of 24 volts for the sensor. All this was some time ago, but I remember that all worked fine. I do also remember paying some time to calibrate and tune the readings of the sensor. But as said, eventually I got the temperature measuremenrs I was looking for.

Hope this helps.

Antonio

Thu, 10/29/2020 - 15:40

LabJack Support

The only thing I will add is

The only thing I will add is that there are both 4-20mA and 0-50mV output versions of the sensor, which antonio is talking about and has used. The 4-20mA version seems like it could be better for the U3 than the 0-50mV version since the output of the CurrentShunt will use the full 0-2.44V range of the U3 flexible IO. You could configure the sensor like Figure 6 in the CurrentShunt datasheet and it should work well like that with an external 24V supply:
https://labjack.com/support/datasheets/accessories/ljtick-currentshunt

Fri, 10/30/2020 - 01:28

Tasos

Thanks a lot for your quick

Thanks a lot for your quick response.

I have ordered the https://labjack.com/support/datasheets/accessories/ljtick-currentshunt but i have one more question before ordering the sensor.

You have recommended the 4-20mA but should i go with the 2 wire option (standard) or the 4-wire option?

Thanks

Tasos

Fri, 10/30/2020 - 10:39

LabJack Support

It appears the 4 wire

It appears the 4 wire versions use a 0-50mV or thermocouple output, so you would need an LJTick-InAmp to measure that signal, then you would also need a CurrentShunt to measure the 4-20mA internal sensor temperature. The two-wire version would be easier to set up and a bit cheaper.