conversion of turbine flow meter
My apologies for the query, but this software is all new to me. I have a cDaq-9188 8 medium chassis containing several modules including 2 off 9401 counter modules, I run signal express version 6.0.0.
My problem is that I have 3 miniature flowmeters turbine (GEMS units FT-110 series) which give various pulse widths depending on what is the 5V square waves. I brought to the entrance of my 9401 and look of good signals so guess that's my express configuration signal which is the cause of the problem,
I connected the + ve and gnd outputs of the flowmeters Com, DIO1 + Com and DIO3, DIO0 + Com on one of my 9401 cards.
I can see the increment in the number of pulses on measurement & automation Explorer when I run test for this module Panel and watch the chefs of edge that my system can see the pulse from trains.
When configuring the express signal I need it to read in l/min, 58-575Hz corresponds to 0.5 to 5 l/min, but I can't seem to convert the pulse in l/min.
If I select DAQmx acquire > counter entry > frequency it gives me the possibility of updated the custom scale, but every time that I run it I get the error signalling DAQ assistant upward. I tried many synchronization settings with no luck. The only time where I have this power as successfully is using counter entry > County of edge, but I'm stuck on how to convert l/min as it has no function of scale (I know!)
Any help appreciated.
I think that he is referring to l/min in litres per minute, and I guess the Freq of flow are the values of this compilation on the scale.
If this is the case; Carl, it seems to me you must configure a custom scale. You can do it in the channel settings tab in the DAQmxAcquire stage. Under custom scale select Create new, and then select map scale. Min/max Freq should match your flow min/max.
I have attached a few screenshots for reference.
Let us know if we are on the right track, otherwise we might need more information; FOR EXAMPLE. file seproj and a bit more info on the flow meter (type of connection, the output signal, etc.).
In addition, a brief look at the documentation on this flow meter recommends the use of a pull-up resistance. Might want to look there as well.
Tags: NI Products
I use the following hardware configuration to measure a flow meter flow turbine.
Material: 1000 SCXI Chassis
SCXI 1102 voltage input module
SCXI-1303 terminal connection block
Flowmeter: output signal is the frequency of the alternating current (30mv peak-to-peak). Sensor is a magnetic sensor type.
I tried to convert the signal of output voltage in the area of frequency using the FFT, but I get the wrong data.
I wonder if anyone can suggest good troubleshooting techniques so that I can understand what is mess up my position or my technique of measurement in labview itself will not completely? (From my understanding I think that I can measure the frequency of the ac voltage signal generated by the sensor of the FFT. By measuring the frequency I can calculate the water flow)
I am aware that a potential cause might be the ground loop in the system. The signal is based solely on the SCXI-1102 with factory default bias and pullup resistior network. I see no other reason reading wrong or fault in my measurment. Also the flowmter is brand new and there is no risk of damage to the sensor.
I'm sorry if I'm missing out on any important detail to answer that I am relatively new on the techniques of data acquisition.
It's conditioning of signals... and that's what you want to do, so it's not so far
And if your signal about 30mV Ridge to Ridge, it fits perfectly in the beach of crete to 200mV Ridge... I wouldn't say no need of amplification... the + 100mV is not a minimum of signal, this is the maximum signal in this range
Hang it up, take a measurement in single channel mode with one all 10kSPS sample rate take 100ms (1000points) and feed in single tone detection...
display with a graph of signal, stop the vi, in the rigth diagram, click the graph icon and create a constant, save that in a vi and post here if you need help in signal processing
After a lot of tinkering, I seem to have developed an effective VI for use with a type/pelton turbine flowmeter. The flow meter outputs a stream of pulses which
can count on the counter of my 6501 line. Unfortunately this eureka moment happened somewhat by chance, and I'm hoping someone
could be kind enough to explain step by step or in terms very simple for beginners (me) works of VI, thank you.
Welcome to the Forums and LabVIEW.
If you don't the have already made, please work through the tutorials online to get started with LabVIEW. The answers to some of the questions you may have are probably there.
A brief description of your VI:
1. the overall structure is a loop For. It works for the number of iterations that is connected to the Terminal in your case 5 N.
2. the calendar of the loop is determined by the longest time required for any part of the code inside the loop execution. On the first iteration, the DAQ Assistant configures the counter and starts measurement. On all subsequent iterations, he reads everything simply an indictment. On these iterations, the 25 les 25 ms ms expect will dominate. This VI runs approximately 40 iterations per second (for 5 iterations).
This means that the program will take place on 5 * 25 ms = 0.125 sec and then stops. If you run for more 1/8 of a second to help run it continuously button, STOP. Which is intended for certain types of troubleshooting only.
3. the table of waveform and the flow rate meter only shows the last value of the five iterations. (This suggests also that you use run continuously)
4. the registers at offset in this VI nothing do. The upper shift register calculates the cumulative number of the flow meter, but the result is never used. The underpass registry has nothing connected to the Terminal inside the loop on the left. It could be replaced by a terminal.
1. in order to avoid using run continuously, replace the loop with a while for loop. Add a stop button on the front panel and connect it to the stop it real terminal in the loop. Move the graphic terminals of waveform and flow inside the loop.
2 check your pulse to the algorithm of flow rate. The time for the count interval must be considered. For example if the meter registers 25 pulse in 25 Member States, which represents 1 000 pulses per second. This isn't which will show your VI.
3. see examples of code that uses counters.
I have a magnetic flow meter, which gives me a measured 4-20mA signal. I'm reading this signal using the 9203 module. As he wrote in the technical data I have to use external power supply. I have 2 sons of my August flowmeter + and GND. I connect August + food + and GND to AI0 after that - from feeding to Com in 9203. I am doing everything correctly? I see not all values change.
Thanks for any help.
Have you tried looking at the output with only a voltmeter digital or similar on the output?
It would be a good guide to tell you what really is the signal.
The 9203 gives a FXP signal in amperes, so if you expect 8ma your jpg shows 7.16 to 7,74 my which is close.
As I said earlier, I found that the signal of the 9203 is rather noisy and apply filtering to clean up the signal, I guess thatâs you measure the flow rate of the signal change very quickly compared to the sampling frequency 9203.
Also check if the WHAT GND is connected to the MASS of other output signals.
See you soon
I am trying wire a ST75 meter to my DAQ system consisting of a device PCI 6052E DAQ, SCXI 1102 b card and a block to connect SCXI-1300. 1102 b has four 249 Ohm resistors connected to channels 0-3 for use with the current of the flow meter signals.
The flow meter has two output signals 4-20 my and RTN, SINK, SOURCE and com connections The documentation is not clear how to connect the sensor to the Terminal Board, other than to say if the two output signals is used, one of the sons of RTN are used. So far, I can not get the signal from the flow meter to work in LabView, so I don't know if I have it plugged properly. Currently I have 1 wire OUTPUT on the Terminal Board + CH2, CH2 - wire to the chassis ground terminal and the COM lead on the sensor.
Thanks in advance.
Towards the end of the manual there are wiring diagrams:
SINK/SOURCE/COM are used for pulse ouptuts. It seems that there are two outputs, one for 4-20mA temperature the other for flow.
The one you need (flow) conjnction with RTN wired to use the + and - (or COM) your DAQ hardware.
Can someone direct me to a VI for a liquid of Sensiron meter? I use a DSM of 1600-20
Thanks to the folks at Stanford and the University of Santa Clara, it works now, I'll join the vi
on my laptop the meter does not read and he tells me that the driver is missing, but when I try to download on the site the hydrotechnik nothing happens
You should probably contact the meter manufacturer.
I have sensor Omega FTB 1302 and NI DAQ 6229. Sensor has analog output. I do not know how to connect these sensor and daq.please help
I have the mass flowmeter and controller of Bronkhost. I tried to control using RS232 communication and I found labview progrma developed by Bronhkost to set the desired value and read the measured values. These works of independent Labview programs and when I try to set and read the measured values by connecting one after the other. I can adjust the temperature setting to the controller, but I can't read the measured values. Therefore, I here enclose labview programs, developed by Bronkhost. Any body who has done it before please help me with my troubles.
I'm trying to use LV with Modbus bookstores to read/write information to a Flowmeter Micromotion. The meter is connected to the PC via a B & B electronics isolated converter USB RS485. VISA see the converter very well. However, every time I try the meter reading, I get an error "VISA: (Hex 0xBFFF003E) could not complete operation because of the i/o error."despite all my efforts. " Can't understand you my problem, maybe it has to do with how I address the meter? I posted my code for any future reference.
Thank you, it turns out that my camera had been incorrectly wired. I can now read the information I need from the flow meter.
I have a NI9203 Module, NI PS15 power supply and an FV103 Omega flow meter (http://www.omega.com/ppt/pptsc.asp?ref=FV100#ManualList) -j' have attached the wiring diagram for this post from pg 7 of the manual.
(am using labview and a cRIO-9074 but that's all works well)
I try over their but don't know exactly what I need to wire what.
I currently have:
+ 24 VDc wire from meter to + on the power supply
-24 VDc wire from meter to-on food
4-20mA output signal flow meter to the AI0 on 9203 module cable
Is to correct the above, and I also need to plug something into the COM port on the 9203?
Thanks in advance for any help,
I checked with a multimeter and the flow meter's output signal correctly... I disconnected and reconnected everything and looks like it is working fine now (perhaps a son was not fixed to correctly or something)
Thanks for your help,
I'm relatively new to LabVIEW and I'm trying to collect data from multiple sources with calendar sync on the acquisition, but I can't understand. My problem is that I have two inputs frequency meter, an optical tachometer reading one pulse per revolution and a max flow meter machines with a 12000 k coefficient. I can't find a way to synchronize the calendar with my multiple analog inputs. I tried to first get the speedometer to synchronize with the analog inputs following the example linked here. (https://decibel.ni.com/content/docs/DOC-10785) So far every time I run it I get an error on the DAQmx read timeout or an error "several sample clock pulses have been detected" (see image). It seems if I slow the way to down to say 10 hz and make sampling rate ensure that the tachometer signal is more than 800-1000 rpm (13-17 Hz) before starting the VI then the program will run without error until the ROTATION speed is below this threshold, then the "sample Multiple clock pulses" error occurs. The code is attached below.
Does anyone know of a better way to synchronize the entries of frequency of the counter with analog inputs? I would like to have a VI that can display 0 RPM (and possibly 0 flow as well, but I think I need to understand the timing of a meter before I have add another, because it seems that I can't have two counters to the same task). Any help on this would be greatly appreciated.
LabVIEW version 13.0
Chassis cDAQ-9178 with NI 9401 for both counter inputs and NI 9205 for the analog inputs.
I know the error requires to restart the task at least (this particular error puts the material in a State that cannot be recovered from during execution of the task - I've been down this road before) but I'm surprised that you would have to delete and re-create the task altogether. And then I had to do this to workaround other questions in the past. It is awkward and should be considered a bug, if this is indeed the behavior.
Honestly, regardless of this bug, the way the material dealing with the situation of several sample clock edges makes measures of sampling frequency clocked essentially unusable for purposes of synchronization (in my opinion anyway) If you encounter a more slow than your sample clock rate. You are supposed to be "synchronization" of the measure, but it really no longer applies if you have to restart the task over and over again (if you must delete it or not).
Workarounds can get kind of creation (which isn't really a good thing). For example, you can configure a measure of implicit frequency to keep a buffer of frequencies and use a leader board task (source is the frequency signal, sample clock is the sample clock HAVE) to establish a correlation between the index of your buffer of frequency for singing HAVE sample clock.
We ordered the cRIO 9035 system with several Modules.
One of them is the NI9401.
I want to use this module to count the pulses of a flow meter.
In front, I am a beginner and started just look at a lot of tutorials and created Basic VI
- This Module has onboard counters, or is it only possible to use the 'material' - counters in the chassis through this Module?
I ask this, because I can put the Module via "Digital specialty Setup" as a counter.
If I do, it would be possible to simply create a while loop, place the channel on the inside and tie him to a digital item?
Or is the only way to count impulses (rising edge) to use VI as the 'edge counter VI' the example of VI?
- My flow meter uses a Hallsensor and produces rectangular pulses at 40 Hz max.
It is absolutely necessary to use a FPGA or can I use a VI on the host computer?
We use 4 of these flowmeters (and many more sensors like Termocouples (NI 9211), solenoid valves (NI 9482) or a AKD-servomotor (NI 9472).)
All the measured data should be written to a file (for example, form exel).
Magnetic valves must be triggered if a certain number of pulses is counted.
Yet once, it is absolutely necessary to use a FPGA or can I use a VI on the host computer?
I know there is a lot to do and I have to learn a lot more, but I'm on it (its for my Masterthesis).
For now, the answers to questions about existing or not existing edge counter would be great.
Thank you for your support.
Greetings from the Germany,
Greetings from Munich (since it is a public forum, I am obliged to answer in English, in any case).
(1) when you use a cRIO you don't have a strict meter limitation (especially if you program the FPGA) for your digital inputs. Maybe read you something about that and that only applies to the cDAQs (because he (mostly) counters come from cDAQ chassis so they are more limited)
"If I do, it would be possible to simply create a while loop, place the channel on the inside and tie him to a digital item?"
"Or is the only way to count impulses (rising edge) to use VI as the 'edge counter VI' the example of VI?
I'm not sure which exact VI you are referring to, but on the FPGA you could implement a custom counter. That would work too.
(2) you can do two ways (Scan Engine Mode and FPGA)
If you write a master's thesis, you may be eligible for a greatly reduced price. The course Embedded Control and Monitoring (http://www.ni.com/training/embedded/) would be very useful for you:
Forderprogramme as research, training und Lehre - National Instruments Germany GmbH
- This Module has onboard counters, or is it only possible to use the 'material' - counters in the chassis through this Module?
I use the PXI-8431/2 to read data from the flow meter PDS ELITE (Modbus RTU). Receiving data, the RS485 protocol request to terminals 4 and 5, but this configuration does not seem to work. When I connect the RS-485 converter USB of Microflex I get the data correctly, so somehow between the PIN lay and PXI this problem there.
Can someone help me?
See you soon,.
I think that what was Hossein trying to send you is the following:
Can you also tell me a little more what you use to read the data? What environment. You have 2-wire or 4-wire Modbus RTU?
I am Thiyagi.I am working in WABCO INDIA Ltd. I bought Bronkhorst Flowmeter. I use the tiara DAC Professional version. I want the meter to DIAdem.Flowmeter of the interface have a RS232 communication. In my pc, I have a COM1 port. DIAdem DAC which icon I want to use to connect the flow meter.
You can already succeeded, but still, here's what I used to do:
I could do this with flowmeters mass Bronkhorst and Brooks, and had a pretty good success using their method of DDE (dynamic data exchange). To do this, download their software from FlowDDE of Bronkhorst.com, start the DDE driver and he can communicate with the MFM. Once it works, insert a DDE lockk in CAD DIAdem, configure it appropriately and it should work.
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