Read thermocouple in mV

Similar Questions

• I can't read thermocouples on the PXI-6225-series M 1 connector.

  I'm reading 30 measures by thermocouple in differential mode.  I use AI0 as the CCM.  Attached are the connections that I use.  Negative contributions all relate directly to the GND AI.

  I have no problem to read the thermocouples in slot 0 (AI1 by AI 7).  I have install Connector 1 direct feed by mode (switch 1 & 2 right and switch 3 upwards).  In MAX, I get a normal reading, but it does not vary by heating the thermocouple.  In my real program, it is as if there is nothing connected. Any ideas as to what I can hurt?

  Thank you

  Mark

  Mark,

  Thanks for posting. I think the question might be to see you about the how the SCB-68 must be configured in mode of direct crossing to be used with the connector 1 on the PXI-6225. When the switches on the block are defined for a direct crossing, the Council is not connected to the CJC. Do not have a connection to a CCM on this connector could cause this problem.

  A potential solution, you can try is to connect a temperature probe to AI16 and follow the steps in this KB, using that channel instead of the CJC channel. Let me know if it helps!

  Kind regards

  Joe S.

• 6001 USB does not accept the inputs for thermocouple

  Now enter one of the differential analog inputs of the 6001 USB a type K thermocouple. I used the wizard DAQ to do, but the shows around 3 oC reading at room temperature. Has anyone else encountered this problem with the 6001 USB? (When I have an input voltage, which works fine, while the device works very well).

  Allan,

  When you run a task of thermocouple on one of our analog input devices the device will read voltage on that channel and then convert it to a temperature using the known relationship of the thermocouple. The Type K thermocouple has a sensitivity of ~ 41 UVC.  The USB-6001 has a resolution of 14 bits with a range from - 10V to + 10V.  This gives us a sensitivity of ~1.2mV or ~29.8 C.  This does not factor in which the USB-6001 has an accuracy of 6 mV absolut which made soar as the other.

  A measure of thermocouple should read changes in voltage very low levels of very low voltage, that is why we have devices speifically read thermocouples.

• LabVIEW PID PWM controller

  Hello everyone.

  IAM working on a temperature of Labview control program that uses a controller of PDI, a radiator, a read thermocouple temperature.

  IAM able to read the sensor and I think that I managed to implement the PID as well.

  What I have to do now is to convert the output of the PID in a Cycle of use appropriate in % to enable/disable-energize a Solid State Relay for the power supply of heating.

  To generate a square wave, I thought using the Waveform.VI of the place. (see image below)

  The output for the PID is in the range 0... 5 v so I guess I do this output to scale in a way?

  Thanks in advance for any help,

  Best regards

  Michael

  I have not seen that VI PID single within a certain time, and if you have access to the PID toolkit (now included with versions of LabVIEW non-Base) you must use that one instead. In both cases, however, the limits of output are set by entries in the VI - in your case, the 'threshold' and controls 'Cap '. Change these so they are 0 to 100 and then use the output of the cyclical report.

• My ic emits a milivolt signal constant 330 he won't go below

  Hello

  I have a problem. I also connected an above (AD594). and thermo couple and I am able voltage through NI USB-6009. I get the right result for greature the temprature of 33 degrees centi. but when the temprature becomes less than 33. My ic emits a milivolt signal constant 330 he won't go below. means can't measure only minimum temp 33 degree. my temperature is 20 degrees. How can I check temp less than 33 degrees?

  Thanks for help

  HERE'S THE ANSWER...

  http://forums.NI.com/T5/Multifunction-DAQ/how-to-read-thermocouple-output-with-NI-USB-6009/TD-p/9902...

  Thank you guys

• IOtech personnaldaq 3005

  I have a new PersonnalDAQ3005 I am trying to run on Dasylab. He reads thermocouples very well on the software IOTech, but gives the waste during playback Dasylab. It will however read the differential voltage correctly in Dasylab. I've already put Dasylab to read the sensors of type k is there a setting "cold welding" somewhere that I can't find?

  Have you contacted IOtech directly? They are much better equipped to help you.

  www.IOtech.com

• How to configure a lab overlooking tubular heat exchanger to get data

  HiI

  In our undergraduate engineering chemical labboratory we want to configure our DAq with lab VIEW tubular heat exchanger to get information on the temperature (flow cold fluid warms up), (the steam pressure on the side of the hull of the heat exchanger) and flow (water warms up).

  Can anyone suggest thermocouples, pressure transducers, and flow meters to stay between the heat exchanger and the acquisition of data?

  P.S. the heat exchanger is already equipped with a pressure gauge, thermometers and a rotameter, but we do not know how to connect these devices to data acquisition

  Looks like you have enough information to choose appropriate sensors, you just need to do the research. I start looking into Omega catalogue, or give them a call - they are generally useful. I can't take the time to spec parts for you - it would be a lot of time on another project. Most pressure sensors put a signal 4-20mA or 0 - 5V, that is which you can read through an analog input on a data acquisition; measure a 4-20mA signal requires a resistance to convert voltage. Most NI DAQ boards can read a thermocouple on an analog input, but make sure that your hardware is supported reading thermocouples. For an accurate reading, use a device that has the compensation of cold welding integrated - for example, the block connection SCB-68 - and for more accurate measurements, get a Board specifically designed to measure the temperature.

  For measurement of the flow, a standard, simple solution is an orifice plate. You put a transducer for differential pressure across it, seek the appropriate equations and use them to calculate the flow rate given the density of the fluid (which you will be able to calculate from the pressure and the temperature, since the steam tables are widely available). Other differential pressure devices are available as well - at a previous job, we used a double cone of McCrometer. If you call them, they spec for you - but get an approximate cost first to make sure it's in your budget.

• Is the are recommended so that the SCXI installation cards in the chassis?

  I have a module SCXI-1001 with 3 cards scxi 1102, scxi 1 1520, 1 scxi 1126, 1 1162hv scxi and 1 scxi 1160

  connected to a PXI-1042 chassis with a pxi8108 and pxi 6289. Is there a recommended in the frame for these cards order?

  I use the 1520 to read the frequencies and the 1102 reading thermocouples.

  Hi Marko,

  Your SCXI module slot residing in is not important, but what is important is the module in which you use for communication.  Please follow this link which contains the rules for the connection of your SCXI modules to your DAQ hardware.

• Reading of Thermocouple Type K with myRIO

  I have a myRIO (room only) and I need to read for an internal PID K type thermocouple measures.  I am able to do this directly in the room?  Or I need an adapter?

  Be as specific as possible.

  Thank you.

  The above listed connector is the connector for the card myRIO only.

  In addition, the thermocouple type k has a + and - sign. If the + needs to go to one of the analog inputs and - needs to go ALWAYS, analog ground. See page 5 of the below myRIO 1950 manual for the pinout of the connector.

  http://www.NI.com/PDF/manuals/376099a.PDF

• Strange thermocouple at the time reads high

  I have a problem my thermocouples to high playing time. I have a cRIO 9074 with a connected to 3 K type thermocouples 9211 thermocouple module. Thermocouples monitoring 3 heat zones from a giant furnace, in which areas can be activated and deactivated with the help of a relay. When activated, the thermocouples read the temperature normally up to 800 ° C. However, when it goes beyond 800 degrees, it can seem to read normally, but when you place radiator different relay on or off, the thermocouple reading significantly changes a few times. This does not happen below 800 C see attached photos and assume that the first photo is the right base temperature:

  

  

  

  When I joined the first box to an external drive thermocouple with its own digital screen, I don't see this radical change when switching of the relay on and outside. It has remained relatively constant.

  Why I see such a big change with the 9211 module? I'm not process the signal somehow, just a direct reading, and the module itself is configured to play the K type thermocouples. The heater contactor and thermocouples are relatively far.

  Any help is appreciated.

  Linus

  Hi Craig,.

  Yes, I could solve this problem. a LabVIEW engineer suggested this solution and it worked. See Section 3 (Nonreferenced) floating measurement of Sources at this link:

  http://www.NI.com/white-paper/3344/en/#toc3

  
  The source of the problem was instrumentation amplifier input bias currents, causing the voltage level of the floating source to be moved out of reach. I need to add polarization resistors to provide a path of DC since the instrumentation amplifier inputs to the instrumentation amplifier ground and anchor this voltage level at a few references. I followed resistors in FIgure 10 and added two 100 kOhm for each of my thermocouples. Since then, I have much more fluctuating readings.

  Hope this helps,

  Linus

• incorrect thermocouple reading

  I have an NI PXI-1033 with an NI TB-2709 block and I'm under Labview 9. I'm just trying to read the temperature with a thermocouple to any of the eight channels. Unfortunately, when I look at the reading of the measure and menu task Automation Explorer value fluctuates all about the difference from peak to Valley about 50 degrees C. I tested the thermocouple on a multimeter and it gives a good reading. What's wrong. Help, please.

  Once I updated the chassis ground to the shield of the input cable that the noise went away.

• Reading of fluctuation thermocouple k type

  I'm new to Labview please anyone can help would be appreciated.

  I'm trying to read the temperature using thermocouple type K with a NI 9213 module in Labview.

  I used two individual channels.  One is the ambient air temperature.

  The second is one is inside the PVC piping Assembly read the temperature of the air flow which also has moisture.

  Ambient air temperature reading is working perfectly fine.

  Reading the inside of PVC piping is fluctuating.  The temperature varies randomly between 4-7 degrees Celsius.

  My question is what causes this fluctuation of reading.  Is - this air flow inside the tube.  Vibration?  Moisture?  CYC?

  Please help someone?

  Thank you very much in advance

  Danh

  
  

• Try to get an accurate reading of the thermocouple

  I have connected to OR cDAQ-9174 9201. I have the 9201 an OMEGA TAC80B - k Thermo-to - Analog Converter. I have it connect through sheets bananas with the Red wire to AI0 and com I have a K type thermocouple connected OMEGA. When I run my VI I get strange reading of negative values on the wave of Temp table. I tested the OMEGA with a THERMOMETER, and it works. I don't know what the issue is here. I try to get the temperature reading.

  
  

• Thermocouple reading (w / Source built-in CJC) only works on the random strings of CBS

  I'm using LabVIEW 8.2.1, a card PCI-6255 and a block of connection SCB-68. I have a Type K thermocouple with a calibrator thermocouple which I'm trying to measure. It is the problem, first, using the attached VI, I tried to read this TC with AI0. Whenever I have use AI0 I get error saying THAT integrated CSF is not available. When I use another channel, this error disappears. The second problem, when I use a different channel than the AI0, I am only able to read Treasury on random channels correctly. For example, it works on AI13 to AI15. For channels that does NOT work, I am able to see the correct voltage thanks to MAX, but DID read TC VI not for any reason any gives an accurate reading.

  Nobody knows why, I wouldn't be able to use AI0, and why I only use certain channels for this TC? This is absolutely insane and I tried swapping the CBS, the map of the DAC and cables. I also reinstalled drivers and LabVIEW.

  Please help this is driving me crazy!

  Thank you

  BKB,

  The CCM should be configured for differential.   Following quote found here http://digital.ni.com/public.nsf/allkb/96B996BAD82A84E9862570690066B03F

  «If you configure the switches on the SCB-68 to allow the probe on single-ended channel 0 (I 0) rather than differential has channel 0 (HERE 0 and AI 8), you cannot use a task of temperature DAQmx.»

• How do you make thermocouples to read below-200 c? LabVIEW doesn't let me.

  I use the SCXI1102 thermocouple with the K type thermocouples.  This is an M series data acquisition card in a PXI chassis.  My problem is that I want to measure temperatures up to 35 K and LabVIEW won't let me.  When I try to set the value min minus-200 C, then I get the following error when I try to run my program:

  ... min temp falls outside the limits of polynomial precision scaling...

  ... define the scale of Thermocouple to Table Type property...

  How can I do this?  I'm more than willing to enter into the table of correspondence of the NIST values, but I don't know how.

  In addition, it does not when I try to use the Kelvin units.  But I don't mind everything by adding 273 to work around this problem.

  Hey, Astro.

  THE AI. Property ChanCal.ScaleType (Analog Input"General Properties" channel calibration' scale parameters' scale Type) differs from the AI. Thrmcpl.ScaleType Property (Analog Input"temperature" "scale of the Thermocouple Type).  THE AI. ChanCal.ScaleType property allows you to change the method that uses of the calibration scale, while I. Thrmcpl.ScaleType property allows you to change the method that uses the scale of thermocouple.

  If the AI. Thrmcpl.ScaleType is not in your list of properties, see this article in the knowledge base for more information about this missing DAQmx channel property.  After that you are able to locate this property DAQmx Channel, embed it in your code, as shown in the following screenshot:

  

  I would like to know if it works.  I hope that you are having a great day!