The temperature of Thermocouple on Labview

Similar Questions

• Temperature measurement and the CJC using thermocouples on a USB - 6229 BNC

  Hello

  I'm trying to get the measurements of temperature using type K thermocouples on the box nor usb-6229 BNC. SignalExpress software doesn't let me choose 'Built In' to the Source of the CJC. So, I must select 'Constant', which means that I then have to follow the evolution of the temperature during the day with a separate meter and adjust the value of CJC accordingly to maintain an accurate reading. Is there a way around that to avoid having to monitor the room temperature at the junction?

  Thanks in advance

  Mike

  Hi Mike,.

  It seems that you have managed to find a solution for you have this problem, which is great news.

  However, for future use, if you had bought the 6229 with massive ending (rather than the interface BNC) then you might have interfaced unit with a block of connection SCB-68 (see link)

  http://sine.NI.com/NIPs/CDs/view/p/lang/en/NID/1180

  The SCB-68 has a CYC source built-in, so you might have used in conjunction with 6229 (mass layoffs).

  A bit of in the way, but I thought you may be interested.

  Best wishes to you all

• update of the temperature

  I'm new to labview one I have the code to get the temperature with a thermocouple sensor. But I was wondering how to do the update of temperature (not every second but maybe every minute) isn't just a simple loop? I'm confused. If someone could help me that would be great, I have attached the code below.

  Gotti_uncc wrote:

  The first acquisition of data read must be locked in the while loop?

  If you want to update constantly...

• Measure the voltage and the temperature simultaneously with PCI-6281

  Measure the voltage and the temperature at the same time at the same time. However, when I put the voltage and temperature in a loop, the acquisition of voltage is significantly delayed. When I put the voltage and temperature in two different loop, none of them works.  There is an example in aid of Labview as shown. This structure works fairly quickly? In addition, how a volgate get and temperature Analog DBL 1Chan 1Samp? I check the exported excel, the first column is 0, 1 the second column contains the value of the voltage, temperature value. I wonder how can I get these two values for each scan.

  ,

  Assuming that the DAQ cards can handle it, you can set an analog trigger for the channel of the tension.  Then you just X samples to get your 100us data value.  Keep the last sample.

• programming the temperature

  Hello Experts,

  I have the Watlow Ez area chaffeau laboratory oven thermostat. Its been properly connected to the computer and I can give the set point and read the value of process in Labview.

  But I need to add in labview so that there will be a different temperature for different time intervals.

  for example, 200 C stand for 4 hours then

  go to 300 c and hold it down for 3 hours

  go to 400 and hold for 4 hours and like that.

  But I don't know how to start with this.

  Please help me!

  Best regards

  Atul

  Or you need to change your program, you can implement mine inside

  Or you can change mine to do stuff that makes you as well.

  What you can do, is just before sending a new sequence of your oven, you can read the values of the furnace process.

  Thus, to create a new case in the state-engine: "read parameters", and in this case, you can read your settings.

  I've adjusted the earlier VI and said the new case.

• 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.

• Measure the voltage and the temperature at the same time with a single card PCI 6014 DAQ?

  Hello guys,.

  I'm doing a charger measuring the voltage of the battery, the charge current and the temperature of the battery using a 6014 cardboard...

  I want to use my PCI6014 DAQ card to measure 2-channel analog voltage input and 1 temperature Channel Analog input using thermocouple type k measurement of voltage or temperature isolation is OK, but I can't understand how to measure the voltage and the temperature at the same time... I want to use input differential...

  Thank you in advance, all the tips

  YSL

  Create a task and add channels to the task, as follows:

  

  Christian

• Update bar color of char in the evolution of the temperature values

  Hello everyone. I actually read a temperature sensor and plot the data in the form of a bar graph. I am acquiring the data every second, and present them in a chart bar. the challenge is to show different colour on the bar chart that the temperature will dangerous.when playback security are safe, the graph must be red red, when there is just the graph must be orange and dangerous. I'm using Labview 2012.I need to get started as I'm actually learning the software.

  future prospects for the hearing from you guys.

  Yannstephen

  Using a range of set a defined value is something that comes up fairly often. Here are two solutions that may apply to you. The first uses logical operators and work as expected.

  

  However there are disadvantages to consider: what happens if you decide to add more beaches that have different meanings? This solution is well-suited and will become very difficult to maintain. The second solution solves this problem by using a Structure box. Note that the case structure only accepts integer values in the terminal of selector. You can read about workaround implemented here.

  

  I hope this helps!

  -Nate

• . Misfortunes of ICO in the Windows registry for my LabVIEW Application

  Wow, adding that last bit of spit-and-shine in a LabVIEW program can turn into any process.

  I defined a type of file with a .tpml (XML file of the temperature profile).  When my user double clicks on a file of this type, it launches my LabVIEW application.  All this is worked and works well.  I even setup for my program add entries to Windows registry key so that the .tpml file type is associated with my program executable.  This is related to my previous post here.

  The problem I have is that I did a fantasy for my LabVIEW program icon and these well DOCUMENTED files.  The problem is that the key of Windows registry entry that associates this file in my program, causing the ATTESTED to the 16 icon file icon x 16 my program executable.  If I remove the association in the register, it goes back to the .ico file I made.

  I don't know if I can add my ATTESTED to my .exe file icon so that an association between the two causes the correct icon to be displayed in Windows, or if there is some other entry registry key that I need to do to replace Windows and requires to use my DOCUMENTED file. ICO for the icon.  Anyone know?

  These are the registry keys that makes my Installer:

  HKEY_CLASSES_ROOT\

  .tpml = "tpmlfile".

  . tpml\DefaultIcon = [INSTALLDIR] data\TPMLFile.ico

  tpmlfile = temperature profile XML file

  tpmlfile\shell\open\command = [INSTALLDIR] Profile Editor.exe '%1 '.

  I have all of the isthmus and the brightness I want in this program with the exception of this problem with the icons (less a few problems the keyboard TAB).  As I said, if I remove the entry "tpml\shell\open\command" in the registry, the DefaultIcon works OK.  With this registry in place entry, it uses by default the icon 16 x 16 for "Profile Editor.exe".

  Any ideas?

  Thank you very much for your time and input!

  -Nic

  The solution was that I needed the DefaultIcon key as a child of tpmlfile entry NOT .tpml.  Here is my final registry keys that work like a champ!

  HKEY_CLASSES_ROOT\

  .tpml = "tpmlfile".

  tpmlfile = temperature profile XML file

  tpmlfile\DefaultIcon = [INSTALLDIR] data\TPMLFile.ico

  tpmlfile\shell\open\command = [INSTALLDIR] Profile Editor.exe '%1 '.

  -Nic

• How to measure the temperature of 4 RTD simultaneously?

  I'm implementing a systerm requiring several measures the temperature. I am able to make a measure of RTD. But if I have the same code to create two measures of mirror, I get an error - 50103 "the resource specified is reserved". I just started using LabVIEW, so any help is valuable. If there is already material available on this topic, could point me there please.

  You can have as many channels of the same type (in this case of analog input) in a task.  If your simple solution would be to have four channels in your task.  You also need to set your Read DAQmx for multiple channels.

• read the temperature of the chassis of a cRIO in Scan Mode?

  I am trying to create a section for monitoring my VI which monitors the status of the cRIO 9022 and backplane (9104) I use. I understood how monitor memory, CPU utilization, and the input power voltage.

  I know that you can monitor the temperature of the chassis using the FPGA options, but I want to keep my cRIO in Scan mode. Is it possible to access the scan mode chassis temperature probe?

  I found the solution I was looking for. NOR has built a VI to get the temperature of the cRIO, but it's not easy to find or in the open air.

  It is located here:

  c:\Program Files\LabVIEW 8.6\examples\CompactRIO\Controller Specific\9022 voltage and temperature Monitor\cRIO-902 x Support files

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  Drop in the cRIO app and the Vi shows the temperature of the CPU cRIO in ° C card.

• Noise on the readings of thermocouple on the NI PCI-6225

  Hi all

  I have a problem with what appears to be static electricity caused by noise on thermocouples.

  We test with a sand as a medium flowing through a plexiglas window and measure the temperature in the stream. The interaction of mixture air/sand flowing through the plexiglas creates a significant amount of static electricity and our thermocouple readings are severely affected. Is there a way to filter the signal so that my data and off-scale obvious signal analysis tools ignore?

  The filtering I see seems to apply only to high frequency noise. I would like to cut the signals from the TCS to ignore all of the above measures 700DegF and under 32Degf.

  Thank you

  Hi Emi_emii,

  It might be useful to see what the current state of your VI acquisition is - just to get an idea of your overall architecture. I see a couple of alternatives.

  1. You could do some external signal filtering to get rid of the extra load on your son of thermocouple - see this valuable whitepaper on the topic of wiring: http://www.ni.com/white-paper/3344/en/
  2. The extent of the filtering software, you could use the cooker and force the function (http://zone.ni.com/reference/en-XX/help/371361J-01/glang/in_range_and_coerce/) on your data and the use of the Boolean output to hide your actual data or simply to force your MAX/MIN values

  Hope this helps!

• Measurement of the temperature with the PCI-6229

  I was announced in an old thread and do not receive and answer, so I thought I try a new.

  Link to the old thread: http://forums.ni.com/ni/board/message?board.id=250&thread.id=14920&view=by_date_ascending&page=1

  I'm trying to measure temperatures using thermocouples using the PCI-6229 and I use two SBC-68LPR to make the connection.  They are not reference on them joints.

  After moving down from enugh to careful reading of the old thread I mentioned above and I think I knew what I should do.  Here's what I do now:

  Create a task - DAQmxCreateTask

  Create a channel for this task - DAQmxCreateAIThrmstrChanVex thermistor

  Create a number of channels of thermocouple for this task (DAQmxCreateAIThrmcplChan) using the cjcsource DAQmx_Val_Chan option and specifying the string thermistor as the source channel

  Start this task - DAQmxStartTask

  Get the temperatures - DAQmxReadAnalogF64

  Stop the task - DAQmxStopTask

  Disable the task - DAQmxClearTask

  I have not yet hooked, but I doubt that it is the cause of the error.

  A few more details (pardon my Delphi):

  Create the channel of the thermistor

  TmPcName: = ' Dev1/IA.19 ";

  Secret: = DAQmxCreateAIThrmstrChanVex)
  TcTaskHandle, / / task handle
  @TmPcName, / / physical channel name
  @TmChName, / / name of channel
  -80,                                   // Min range
  80,                                    // Max range
  DAQmx_Val_DegC, / / units, ° C
  DAQmx_Val_ResistanceConfiguration_4Wire, / / 2-wire, 4-wire, etc.
  DAQmx_Val_ExcitationSource_External, / / source of excitement, external
  1, / / value of excitement
  9.376e-4,                         // a
  2.208e-4,                         // b
  1.276e-7,                         // c
  30000);                            Resistance of reference

  Creation of the channel of thermocouple:

  TcPcName: = ' Dev1/ai23;

  Secret: = DAQmxCreateAIThrmcplChan)
  TcTaskHandle, / / task handle
  @TcPcName, / / physical channel name
  '',                                     // Channel name
  0,                                    // Min range
  1000, / / Max range
  DAQmx_Val_DegC, / / units
  DAQmx_Val_DegC, / / type of Thermocouple
  DAQmx_Val_Chan, / / source CJC
  25, / / value of CYC, so DAQxm_Val_ConstVal
  @TmPcName);             CJC channel, so DAQxm_Val_Chan

  It looks like 4 scales is required for voltage excitement thermistor measurements.

  In addition, it seems that external excitation is necessary in my case, PCI-6229.

  Everything works if I use a CJCConstant.  When I do this I use the same code to create channels of thermocouple, but I spend creating the channel of the thermistor.  When I try to use a CJCChannel I get an error saying "value required is not supported for this property value," which occurs when I call DAQmxStartTask.  I don't have no idea of what this message refers to and the best I can tell the properties that I've specified sense.  The constant termistor are from actual thermistor, that I found on travailleursduweb.com.

  I could also use some help to know how to connect the thermistor.  Looks like I need to fab, a thermistor circuit myself, with a stable voltage to power the termistor and use a double-ended analog and reference to the channel.

  Thank you

  Mike

  The error of thermocouple type was a type-o in the post.   Thanks for catching it.

  I think I found the problem.

  I wrote a small program to test for Thermistors and I went to using the routine exctation of tension for a common routine of excitement (... IEX instead of... Vex).  I had been by specifying a minimum value less than 0.  I changed it from-80 to 0, and it works now.  However, I got an error in division by zero, intermittently, when you read a thermistor channel.  The error is not in my code.  It occurs when you call DAQmxReadAnalogF64 for the first time and I'm not all mathematical related to this call.  I'm still looking into it.

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