Mass Flow Meter

Hi all,
I am using PCI 1710 board to control fuel cells vlaves and Mass Flow Meter.
Could any one help in getting the mass flow meter show me the Flow rate of the Gas.
I am using Burkert 8006 Mass flow meter and I wanna connect the MFM to the PCI 1710 and jus want to show me the flow rate. Could any one tell me, to which pin should i connect the MFM to, it has a 15 Pin Sub HD Socket. (Currently taking output from the Process Value Output and Process value ground and connected to the PCI1710 A11 and A10(Analog)). Thank. Awaiting your response.
Regards,
Vijay

What connections do you have to this device? According to the manual you should have a 9 pin D sub connector for the 8006 model. If you have a 15 pin D sub I will try the 15 Pin D sub connections that are in the book on page 7.
If this does not work I am not sure what to tell you. It should use RS-232 with these connections. Did you get a MFM that has communication protocols?
Tim
Johnson Controls
Holland Michigan

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Vi's for profibus with bronkhorst mass flow meter

Hi!
Does anyone know of vi's to help me implement control of flow
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Jan Ole

It sounds like this is some type of serial instrument that you will need to communicate with using the serial VIs. If you know the commands which this instrument accepts, try calling those using the LabVIEW <-> Serial example. I also found this website which claims to have downloadable VIs you can use with such an instrument. Hopefully these options will get you started!
J.R. Allen

Changing flow meter's mode during the measurement

Hi,
I have the CMOSens EM1 gas flow meter which can be setted to either temperature mode or flow rate mode. However, I will need both temperature data and flow rate (in ml/min) data in order to calculate the mass flow rate in kg/min. I am very new to LabVIEW so I have no idea what I can do. What I have in mind is ... doing the measurement with the sensor in temperature mode for ~ 1 second, then change to flow mode for ~ 1 second and change back to temperature mode and so on, until we stop the measurement. So output in data file might be something like this ...
Time   Data
0       temp
1       flow
2       temp
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where temperature and flow data can be in different column. Note that the fastest sensor response time is 5 ms.
Any suggestion what I can do in LabVIEW??
Thank you so much in advance.
Bew

Hi SnowMule
Thank you for your suggestion. The data from flow meter is already in volume per minute so I only need to know density of gas at temperature T to find mass flow rate (...do I miss anything?). It's nitrogen gas and there's some online database availble to get the gas density from known temperature. That's why I want to read the temperature from the flow meter as well.
Additional thermocouple would be a solution if I cannot have LabVIEW to do the job for me.
Thanks again!

Turbine flow meter conversion

Hi,
Apologies for the query but this software is all new to me . I have a 9188 cDaq 8 way chassis containing several modules including 2 off 9401 counter modules, I am running signal express version 6.0.0.
My issue is I have 3 miniature turbine flow meters (Gems units FT-110 series) which are giving out 5V square waves at varying pulse widths dependant upon what the flow is. I've scoped the input to my 9401 and the signals look good so am assuming it's my signal express configuring that is causing the problem,
I've wired the +ve and gnd outputs of the flowmeters to DIO0 +Com, DIO1 + Com and DIO3 + Com on one of my 9401 cards.
I can see the pulse count increment on measurement & automation explorer when I run the test panel for that module and look at the edge counts so my system can see the pulse trains coming in.
When configuring signal express I need this to read in l/min, 58-575Hz should equate to 0.5-5 l/min, however I cannot seem to convert the pulses to l/min.
If I select DAQmx acquire>counter input>frequency it gives me the option of custom scaling but every time I run it I get the DAQ assistant error flagging up. I tried numerous timing settings with no luck. The only time I've got this to count succesfully is using counter input>edge count but I'm stuck on how to convert this into l/min as there is no scaling function (that I'm aware of!)
Any help appreciated.
Solved!
Go to Solution.

I think he's referring to l/min as Liters per minute, and i'm assuming the Freq to Flow are the values that corrolate to the scaling.
If that's the case; Carl, it sounds to me you need to setup a custom scale. You can do this in the Channel Settings tab in the DAQmxAcquire step. Under custom scaling select Create New and select Map Range Scale. You min/max Freq should equal your min/max flow rate.
I've attached some screenshots for reference.
Let us know if we're on the right track, otherwise we may need more info; I.E. .seproj file and a bit more info on the flow meter (connection type, output signal, etc).
Also, a brief glance at the documentation on that flow meter recommends the use of a pull-up resistor. May want to look at that as well.
SCXI- 1000 Chassis w/ 1346 adapter
PCI 6281 DAQ card
SCXI- 1520 Bridge Board w/ 1314 Terminal Block (x2)
SCXI- 1180 Feedthrough Panel w/ 1302 Block
Signal Express 2014.
Win7 Enterprise
Attachments:
freq_lpm.JPG ‏82 KB
dmxA.JPG ‏100 KB

Cole-Parmer DAQ with ABB Aquamaster-S Flow Meter

I have a Cole-Parmer 18200-00 DAQ that I'm using to measure the flow rate using an ABB Aquamaster S. The flow meter sends out a pulse that is equivalent to the flow rate in the system. I'm having some trouble writing a program that would give me an accurate flow measurement. I tried converting the pulse into a voltage by using a resistor connected into the analog port but instead of getting a fixed or approximate number for the flow rate I get a range of flows. I'm guessing I should connect the flow meter to a counter port but I don't know how ?
I might even be on the wrong track to beging with. Please Help ??
I'm attaching the current program I have writtent and the flow settings on the flow meter.
Attachments:
Flow Meter.vi ‏86 KB
Flow Program.docx ‏14 KB

Unless I am confused by your text document, you can simply count pulses.
One pulse means that the pinwheel rotated one time.
They have calibrated one revolution to mean that 1/20th of a Liter has passed.
Therefore, your volume will be:
V = (# pulses) * 1/20
And your flow rate would be:
Q = V / (t2 - t1)
where t is time in whatever units you want.
Cory K

Connect to MKS Alta 1480 Device Net Mass Flow Controller

I have a MKS Alta 1480 mass flow controller (MFC), MFC Manual, Labview 8.2 and NI PCI-CAN card. I know have the MFC wired correctly because I can operate it using another program on the PC that used the deviceNet interface. I want to talk to it via Labview. Everything looks OK using measurement explorer. I have the NI-DNET pallet. I know the MACID. I have downloaded the EDS from the manufacturer.
Here is what I am lacking: A general clue about the DeviceNet interface. Is there any example code out there that could get me started? Are there any tutorials on how to figure out the Dnet protocol? I am used to serial devices command--> response. I don't know anything about Class, Object, attirbutes.
Thanks,
Joe
Solved!
Go to Solution.

Joe, you can read MFC Flow value from S-Analog Sensor Object.
Class Id 49 (0x31), Instance Id 1 (0x01), Attribute Id 6
(0x06)
The default Data Type is Integer and Data Units is counts
If you want read from assembly object, you will
have establish polled IO connection, then use Read DeviceNet IO.vi to read
flow.
Attachments:
MFC Integer Flow.png ‏4 KB

Mks mass flow controllers only giving 2 sig. figs. over deviceNet and labview

We can only read 2 digits (before the decimal point) on an MKS deviceNet mass flow controller using Labview 2013. Does anyone know a solution to increase the resolution on this device? We should be able to read 3 digits past the decimal point.

Hi David,
Could you also specify the type of mass flow controller device?
According to our engineer, we had the APIs to set the attributes of DeviceNet device, but the specific type of the device is required. Attached is the document of some device type. You could turn to page 75 to see there the S-Analog Sensor Object Attributes::FlowDataType could be Get/Set.
Attachments:
1485A-1480A-185A-180Aman.pdf ‏964 KB

Mass flow controller

hello,
does anyone have or know of a vi that can be used to read and display mass flow of a gas?
i have a mass flow controller(MFC) and it reads the gas flowing thru a pipe (or a tube, forexample). i want to be able to take the readings or signals from the MFC and display it on the front panel.
does anyone have something(VI) of the sought that i can maybe modify to do what i'm trying to do?
thanks
-r

A lot of MFC's have an analog out denoting the "is" value of the mass flow.
Connecting this analog out (from the MFC) to an analog in of a DAQ card will allow you to record the values.
This is an easy thing to do (If your MFC has a simple analog out), so I'm not sure if you'll find ready-made functions for it.
Shane.
Using LV 6.1 and 8.2.1 on W2k (SP4) and WXP (SP2)

Positive displacement flow meter

I have a spur gear positive displacement flow meter and a sensor which counts the number of impulses (square-waves). 1800 impulses indicate 1 gallon. How can I measure the volumetric flow rate in Gallon per second? What I plan to do is to count the number of impulses in 0.01s and times as N, and then times 1 gallon/1800 to get the volume, and then divide the product by 0.01. What if the square wave is not complete when the 0.01s period is not complete.

Ravens Fan wrote:
Look for Basic Level Trigger Detection.vi down kind of deep in the waveform, analog waveform palette. It will allow you to search for a rising edge or falling edge in the waveform. Repeatedly do that find all the rising edges in a given sample of the waveform.
Also, look in the example finder. Something like the Trigger Counter example might give you some ideas.
I know how to use the Basic level Trigger detection now, and I am trying to counter the number of rising edges. I am intend to use a cases struture to do it. When the trigger detection is true, then do the loop. The problem is how to memorize the value of last time. I also looked at an example file from the forum. But that one makes me confused.
Attachments:
basic trigger detection.vi ‏52 KB
Detect All Triggers.vi ‏25 KB

DAQ and Coriolis Flow Meter

Hey,
Can someone help me... I need to hook up a Coriolis Flow Meter with the Transmitter IFT9701 to the NI-DAQ - FP1000 but I can't find the wiring diagram.
There are just three wires coming out of the transmitter (red, black and plain) and gives an output of 19.8 volts on a multimeter.
Also, If you have any VIs or know where they are to find the flow rate measured my the flow meter, kindly send me the link or the file to [email protected]
Thanks in advance!!
Have a great day!
Regards,
Saranathan

There are just three wires coming out of the transmitter (red, black and plain)
-- What does "plain" mean - do you mean uninsulated?
If so, I would guess a 4-20 mA output.
and gives an output of 19.8 volts on a multimeter.
That's meaningless unless you tell us if and how it's powered, and what resistor you used to measure.
Did you look up the specs?
It is indeed a 4-20 mA output.
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
Culverson.com
Blog for (mostly LabVIEW) programmers: Tips And Tricks

Labview programming to convert weight measurement into mass flow

Hello,
I have continuous analog input measurement from weight scale. I want to convert the weight measurement to mass flow measurement.
E.g.:
1st minute weight measurement: 200kg
2nd minute weight measurement: 300 kg
3rd minute weight measurement: 350 kg
and so on.
I want to convert those weight into mass flow which is
1st mass flow300-200)keg/1min = 100kg/min
2nd mass flow: (350-300)kg/1 min = 50 kg/min
and so on.
So the weight and should be updated every minute, whatever the time value of while loop iteration.
Can somebody give solution of this case with labview programming? (structure in block diagram)
Thanks,
Eko

Hi Eko,
is this some kind of homework?
Well I suggest to use two shift registers to hold mass and time, then two subtract nodes to get the difference of current and old vlaue for both and finally a simple divide to get the mass flow...
Look here to get the basics!
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

Producing a voltage that coresponds to a setpoint for a mass flow controller.

Hello,
I have a mass flow controller that requires a voltage output signal from my DAQmx board (SCB-68) to maintain a setpoint. This set point is a voltage that corresponds to the desired flow rate. I have produced a scale for this linear controller but I do not know how to use it.
I know how to create a vi that reads a voltage input, I can also write one that sends the same voltage input back throught the output. I can not write one that sends a constant voltage output corresponding to a flow rate.
Could somebody help me out with this?
Dan

Hello,
First, tp upload code (or any document) it is quite easy, just select the file, by clicking the "browse" button... see image below (I'm sorry it's all in french... 'cause I am french ! "Parcourir" means more or less "Browse" ) :
About your app, well adding a channel doesn't require to duplicate the whole code... Developper are always trying to do things with the less code possible . Check VI attached and tell me if it matches your needs.
Message Edité par TiTou le 03-23-200601:26 PM
When my feet touch the ground each morning the devil thinks "bloody hell... He's up again!"
Attachments:
Gen 2 Volt.vi ‏98 KB
Clipboard01.png ‏14 KB

Looking for sensiron liquid flow meter VI

Can anyone steer me to a VI for a Sensiron liquid flow meter? I am using a ASL 1600-20
Thanks
Solved!
Go to Solution.

Hello,
I could not find any code on either NI's Development Zone or on www.ni.com/idnet (where we store drivers for 3rd party hardware). I did find two drivers for humidity sensors from Sensirion. I've attached the link below. While we do not currently have any code written, there are resources available to help you create your own driver. First you will need the manual on the ASL 1600-20. I searched Sensirion's site, but only found the second link below. You may want to contact Sensirion and see if they have any documentation on how to communicate with their flow meter using the serial protocol. We also have some tools available for you at the last link. At the bottom of the page of the third document below, there is a tab for "Learn to Build Instrument Drivers". Here we have many links to videos and article to assist you. Good luck!
Sensirion Drivers on IDNet
http://search.ni.com/nisearch/app/main/p/bot/no/ap/tech/lang/en/pg/1/sn/catnav:id,n2:RS.sensirion,ss...
Micro Flow Meter Series ASL1600 for Liquids
http://www.sensirion.com/en/02_liquid_flow_sensors/03_liquid_flow_meter/03_asl-1600.htm
IDNet (Learn to build drivers)
http://www.ni.com/devzone/idnet/
Regards,
Shawn S. | NIC
Instrument Driver/IVI PSE
National Instruments

Flow Measurement With Turbine Flow Meter Using cFP

Hi I am trying to measure a flow rate using a Gems FT-110 Turbine Flow Rate Sensor. The cable connection has a Red one that says 5-24VDC, a Black one that says 0 VDC and a Brown one showing a square wave. If I am using a compact Fieldpoint, should I use a Counter like the NI cFP-CTR-500? How do I connect the flow meter to the module? Thank you.

This is a sourcing sensor. Look at Fig 3. in the manual .

Flow Meter VI - Pulse Count - Help Needed

Hi,
I am working on developing a Flow Meter VI, I am using a flow meter with a pelton wheen that outputs a stream of pulses in proportion to flow.
The flow meter output is attached to the counter line of my 6501, and the pulse count is multiplied by 1.41 (per datasheet) to give ml.
I have the attached VI but not sure exactly what it is doing, would someone mind explaining how it works and how it could be optimised, thanks.
Regards,
Ger
Attachments:
Flow Meter.vi ‏52 KB

Hi Ger,
Looking at the VI it seems to be just acquiring some data off of your 6501 card, and just edge counting the number of pulses received and then processing the data to give the result of flow. It seems fairly simple in terms of what it is doing, but there are a few optimisations I can reccomend to you. In your VI there is an unused shift register in the first for loop which I would reccomend removing as it doesn't seem to be strictly necessary. In the second for loop, there is an uninitialised shift register, and I would reccomend that you initialise that with a suitable value unless you specifically need it, as otherwise it will just use the default value of the data type, which in this case is 0.
Another optimisation you could use is replacing the DAQ assistant with DAQmx functionality however considering how simple this code is currently, the DAQ Assistant should not cause a problem, however if you wish to expand it in the future I would reccomend looking into using the lower level DAQmx VI's.
Best Regards,
James Kent
James Kent | Applications Engineer | National Instruments UK & Ireland
w: uk.ni.com | ireland.ni.com

Mass Flow Meter

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