Mackenzie Cox

Disregard, I figured it out.

I have several sensors reading in daqami and labview and have had no issues. When I connected my flow sensors, however, the values on daqami look perfectly find, but the values in labview are way way off. This is the same in instacal's "test" feature. I have all of my calibration settings the same in daqami and instacal. Do you know how I can fix this?

I actually got it all working. Thank you for your help

If I am not getting an output with my voltmeter, which I am not, do I attached the resistor between the blue on the flow meter and the black of the flow meter? or the black of the voltmeter?

I removed all of the sensors and connected the white to H, blue and brown to (-) and (+) 18V, and then connected blue to every possible configuration of L and GND. I still have not had luck. Would you recommend changing the flow sensor settings to current output and trying to use the resistor and connect it that way? I called the manufacturer and they said to connect it with "Brown to 18V+, Blue to 18V-, black (or white if it is configured that way) to the DAQ input, and then the blue wire to negative on the DAQ." What does negative on the DAQ correspond to? Whenever I connect blue to 18V- and GND, the other sensors go haywire (and I did unplug all of the other sensors and try this, it still did not work)

Hi I bought this flow sensor: https://www.instrumart.com/products/45963/eh-picomag-electromagnetic-flow-meter Part number: DMA20-AAACA1 Here is the manual: https://www.instrumart.com/assets/Picomag-Manual.pdf I want to connect the sensor to my USB 2416 so that I can read a voltage off of it on daqami. I cannot get it wired correctly to give me the correct voltage based on the scaling. Can you give me some guidance? I have the blue wire connected to 18V- and the brown to 18V+, which I am pretty sure is correct since the flow meter is working at the screen on it is reading the right value, I just need to know how to connect the white and black wires to the USB 2416 to get the readings on my computer. Thanks

Sorry, maybe I was not clear, I am not asking for new DAQ equipment, I am asking for a flow sensor instrument that you guys recommend that will work well with the voltage reading capabilities of the USB DAQ device we already have.

Do you have a recommendation for just a flow meter that will work with the normal channels, not the counter input?

I had issues getting this working so we had to order another one. In the mean time, if this does not work, do you have a recommendation for a flow sensor that can work just out of the box, without the need for the frequency isolation module and additional items?

Can you try to help me understand why the counter channels and the rest of the high and low input channels cannot work at the same time? Is this something in the DAQ system itself, or something on our end somehow? It is not intuitive how to connect the sensor to the back panel or the back panel to the DAQ system, and I feel like the flow sensors should work in the counters with everything else.

How is the flow sensor connected to the board? Just the white wire to com? What about red and black?

I went ahead and bought the frequency isolation module. How do I connect this with the DAQ and my flow sensor?

Okay, I will see if that works. And I use Lab view.

We have a spare power supply. Earlier you recommended trying to power the flow sensor independently from the other sensors. Would you recommend trying that first before buying the frequency-to-voltage converter? Would we just connect red to that positive supply, black to the negative supply, and then the white/green wire to the counter? Do we need to ground it to the DAQ somehow?

Even when I connect the white wire to the counter, the other sensor values diverge to incorrect values. Is there a way I can use these flow sensors without using the counter? When I connect them I can get a voltage, but I have no idea how to interpret the voltage I am getting in terms of flow rate.

I thought the USB-2416 was fine up to 24V? I am almost certain there is not an issue with the flow sensor, as it works great, so long as the green wire is connected.

Connecting the white lead instead of the green gives me the same issues with the thermocouples and on top of that the flow sensors don't work in this configuration. I also tried connecting the black wire to the ground terminal on the USB 2416 with both the green wire configuration, and the white wire configuration, neither of these resolved the issue.

Yes, that is correct. The flow sensors are connected to an external power supply. They are connected to green to CTR#, Black to 24V-, Red to 24V+. Here is the info on the flow sensors: https://dwyer-inst.com/PDF_files/F_40.pdf https://dwyer-inst.com/products/flow/flow-transmitters/paddlewheel-in-line/seriessfi-100t.html The thermocouples themselves are working fine, it is just the DAQ that is having trouble reading them. I attached the 100kOhm resistor to GND from one of the thermocouple CHL. I am still running into the same issue.

They were giving very wide ranging negative temperatures (they should be, and have been, consistently reading something between then 70-80F range). I unplugged everything except these liquid thermocouples and they started working again when the flow rate sensors I have hooked up to the counters were unplugged. So when I plugged the flow sensors into the counters yesterday (CTR0 and CTR1), all of the liquid thermocouples stopped working... Any ideas on how to fix this?

I have these liquid thermocouples: https://www.mcmaster.com/1245N27/ Which I previously had hooked up and working fine. Recently, all of the thermocouples of this kind that are hooked up to my DAQ (USB-2416) have stopped working. All other thermocouples are working fine, and when testing these thermocouples with a multimeter, I know they are working find and giving reasonable readings. Any idea why they would have all just stopped working in the DAQ?

I figured out how to wire the flow sensor using the counters, but cannot find a way for LabVIEW to reference the counter channels. Typically, you can use the MCC "Create Channel" block to call to the CHH and CHL pins, but I cannot seem to locate how to call to the counters.

Okay, I connected it with black to CHL and white to CHH and red to 24+. I am getting a roughly consistent value now, but you said this value is equal to the pulse train? How do you convert from the pulse train to the frequency?

I am using Labview to read everything. Here is the link to where we purchased it from https://dwyer-inst.com/products/flow/flow-transmitters/paddlewheel-in-line/seriessfi-100t.html. There is an instruction manual on that page here: https://legacy.dwyer-inst.com/PDF_files/F_40.pdf?_gl=1*g8yor8*_ga*ODY3MjQ0NzMzLjE2OTA5NzcyNzI.*_ga_9H4TZPR8R2*MTY5MTA4MzQ4MS4zLjEuMTY5MTA4Mzc3MC4wLjAuMA..&_gl=1*g8yor8*_ga*ODY3MjQ0NzMzLjE2OTA5NzcyNzI.*_ga_9H4TZPR8R2*MTY5MTA4MzQ4MS4zLjEuMTY5MTA4Mzc3MC4wLjAuMA.. It has a few ideas for how to wire it up, but I have been unsuccessful at getting labview (or daqami, where I do the testing before I set it up in labview) to read it correctly. I had red to positive power supply, black to negative, and tried having green to CH H CH L or white to CH H or CH L and neither have been successful. I have the channel I am connecting it to calibrated for voltage.

I have this flow rate sensor that I got from Dwyer and it included some instructions for set up, but I can't seem to get it to give me a reading without jumping a whole bunch. Can you guys tell me how to connect it properly?

I also have two pressure sensors connected that require a power supply. From troubleshooting, I realized that when the power supply is disconnected, labview is able to read the thermocouple sensors fine. The issue here is obviously I need the thermocouples and pressure sensors to be able to be read at the same time. Does this provide any insight?