Connecting Omega PX309-10KG5V pressure transducer to SCXI 1520

I have an Omega PX309-10KG5V Pressure transducer that operates between 0-5V and requires a 9V excitation (http://www.omega.com/Pressure/pdf/PX309-5V.pdf).
I am having trouble getting the transducer running on my SCXI box with a SCXI 1520 card. I think I should be using custom voltage with excitation. I am not sure what I am missing.
Any help is appreciated.
Thanks!

floydie83 wrote:
I have an Omega PX309-10KG5V Pressure transducer that operates between 0-5V and requires a 9V excitation (http://www.omega.com/Pressure/pdf/PX309-5V.pdf).
I am having trouble getting the transducer running on my SCXI box with a SCXI 1520 card. I think I should be using custom voltage with excitation. I am not sure what I am missing.
Any help is appreciated.
Thanks!
What does this have to do with LabVIEW?
Post at http://forums.ni.com/t5/Signal-Conditioning/bd-p/300

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Rs232 read and write from pressure transducer with command.

New to LabVIEW and have my first task. I have connected to a Setra pressure transducer via rs232 in Com port 4. I'm trying to track and log pressure over a given period of time. A command of "P" must be sent to the transducer for it to return a pressure reading. By searching, so far I have VISA open, close, read and write on my block diagram. I tried to create a constant from the VISA read resource name and connect it to COM4, but that did not work. Not sure how to accomplish my goal or how to wire everything up correctly. Any help for a beginner is appreciated.

That error is due to some process already having exclusive rights to the port. Do you have Hyperterminal or something else the could be using the COM port open? Did you not close out the VISA reference during previous runs?
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Applying Excitation Load to the SCXI-1520

We use the SCXI-1520 signal conditioner to test and calibrate bridge sensors that we manufacture and it works great. While the system is not used (i.e. when the operator connectes a sensor to the system) the SCXI-1520 is automatically isolated by using relays in a switching system. The primary intent for this is to avoid possibly damaging the signal conditioner. (Operators do regretful things.) This means that the excitation power is floating with no load while the signal conditioner is disconnected,. I was wondering if it would be appropriate to have the system automatically apply a load resistor to the excitation source to keep it "warmed up" so to speak. Most sensors are a 350 ohm bridge and may be as high as 5000 ohms. I was thinking of applying a common 330 ohm 1/2 watt resistor as a load. (We are currently only using two channels at a time.) Although I'm sure it would not make things worse, I just wonder if it's worth the bother. Please advise...

In my opinion, I don't think it is worth the trouble. The temperature
of the SCXI-1520 probably won't change much from connecting a load to
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-Logan K

How to connect SCXI or PXI with 6 pin pressure transducer

hello, I am trying to connect ASCX series differential transducer to SCXI or PXI , but my difficulty is that it has 6 pins they are
pin 1 external offst adjustment
pin 2 vs
pin 3 +output
pin 4 ground
pin 5 n/c
pin 6 do not use
my problem is how to connect this sensor to ni 9237..
I am attaching data sheet of that pressure transducer
Attachments:
Acr8.tmp.pdf ‏331 KB

Without spending too much time looking at the documentation, from using previous similar transducers, the primary two connections you are concerned with are the "+output" and the "ground". The other connections are also important, but aren't directly the concern of the Data Acquisition Hardware. The "+output" produces a variable dc voltage relative to the "ground" input that is a product of the applied pressure, with the maximum output voltage, as shown on the chart, indicating maximum pressure. So you would connect those, through a suitably shielded, moderately short length, wire to the "DAQ" analog input. You will also have to supply the transducer with it's required + supply voltage at pin 2 "vs", and the power supplie's negative to the ground. There are whitepapers on this NI site about connecting to data acquistion hardware and I strongly suggest reading them a couple of times as well as anything online you can find. Writing the DAQ software, in LabVIEW or whatever, can be trivial compared to making the correct, low noise, connections to sensor hardware.
I didn't read how the offset adjustment signal is produced or its use, figure it is designed to allow you to "tune out" some signal offset caused by differences between sensors of a type (they will not all have the same "fullscale output" as indicated in the chart).
As you proceed, please keep asking.
Putnam
Certified LabVIEW Developer
Senior Test Engineer
Currently using LV 6.1-LabVIEW 2012, RT8.5
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Pressure transducer

Hi,
I am using the NI cDAQ-9172 and NI 9205(AI + 10v) with pressure transducer OMEGA model no PX309-001G5V,(pressure range 0-1 ,output 0-5v) to measure the pressure difference but It seems it is not working properly . I need your help to know how to connect the pressure transducer to NI 9205. Also I am not sure which option in terminal configuration in labview program should be chosen . there are options like RSE,NRSE,Differential and Pseudodifferential.
I am looking forward to hearing from you. (Shishij)

Hello!
How have you tried connecting your device so far? Here is a link to another forum post that discusses how to connect a pressure transducer to a NI 9205:
http://forums.ni.com/t5/Multifunction-DAQ/Need-NI-9205-module-to-read-pressure-transducer/m-p/251663...
Also, the following article on field wirings provides great details about all of the different configurations that you can set up when connecting your device:
http://www.ni.com/white-paper/3344/en/
Thanks!
Stephanie S.
Application Engineer
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Setting up DAQ system for testing (using pressure transducer, linear position sensor and strain gauges)

Hello,
I like to get your suggestion in setting up the DAQ system. I am very beginner in this issue.
These SCXI listed below are what we have in the laboratory. I will use DAQ card 6062E.
SCXI 1000
SCXI 1520
SCXI 1140
SCXI 1142
SCXI 1305 , 1302 , 1300
SCXI 1122
SCXI 1100
I will use linear position sensor in my experiment. But I'm not sure which SCXI shoud I connect to this sensor.
This sensor gives 4-20mA output. it requires +13 to +28Vdc excitation.
I will use pressure transducer (strain gauge type) which gives 100mV output and requires 10Vdc supply.
I will use strain gauges 350 ohm.
Regarding to the number of channels used in my experiment, I will use 1 channel of pressure transducer, 1 channel of linear position sensor and 3 or 4 strain gauges.
Could you please suggest me which SCXI should be used with pressure transducer, linear position sensor and strain gauges.
Now I'm thinking to use SCXI 1520 with strain gauges and pressure transducer. Is that ok?
But I'm not so sure on the linear position sensor which gives current output.
And regarding to sampling rate, I like to get minimum of 60-70 KS/s for pressure transducer. And around 1KS/s for linear position sensor and 1KS/s for each channel of strain gauge are enough. Can I archieve these sampling rate from the available SCXI modules mentioned before? I attached the datasheet of pressure transducer and linear position sensor for you. Please see attached files.
I'm reallly look forward for your suggestion.
Thank you in advance,
Ganchai.
Attachments:
XPM6_mini. pr. transducer.pdf ‏115 KB
linear-position-sensor.pdf ‏1683 KB

Hi Ganchai,
I would recommend the 1520 with a 1314 terminal block for connecting your pressure transducer and strain gauge. It is designed for excitation, bridge completion and has many other features to fit these applications. For your linear position sensor, try using the 1100 module with an additional precision shunt resistor. For example, our 1308 terminal block has built in 249Ohm shunt resistors for taking current inputs for your 1100. These connections should give you the readings you would like.
As far as sampling rate goes, you should be fine with your requirements. Good luck and I hope you are succesful.
PBear
NI RF

Simple pressure transducer

Hi
Does anyone have a simple pressure transducer vi with offset null built into code. I am fairly new to labview and most examples I have seen are way to complex for me to figure out what is going on. Is it better to use DAQmx or DAQ assistant? I have two pressure transducer (omegadyne-10V excitation) hooked up to a SCXI-1327 TB with a 1121 module. I wrote a program to convert mV to pressure using linear scale but that's all I know how to do at this point! And I want to know how to read both tranducers. Thanks!
Solved!
Go to Solution.

Hello tacky,
The DAQ Assistant is built off of the DAQmx driver and is typically a good tool for basic tasks but can fall short when doing advanced configurations. In your particular case, you will need to use the individual DAQmx VIs to perform your task. I was able to find the the following Example, Load Cell Data Acquisition with Null Offset and Shunt Calibration, searching the online community. Keep in mind you will need to make some modifications to make the example applicable for you. You will need to change the scaling appropriately, excitation and shunt calibration.
Hope this helps.
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Hello Forum,
I have been using Dresser DXD digital pressure transducer drivers with LabVIEW 2009 without any problems. Recently I upgraded LabVIEW to 2010 and I noticed that data acquisition using the driver became slow and it returns a warning "Dresser DXD default setup is not supported". The warning code is 1073479936. I could not locate this code in the shared folder under the NI installation folder. Do you know what could be the problem with the driver and how I can fix it.
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Zacharia
Solved!
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Hello forum,
I could solve the problem with slow data acquisition by using a simpler serial read-write VI.
Thanks as always for the attention
Zacharia

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Guys:
I have seen the post here about the Temp Humidity sensor: Ref: http://forums.ni.com/t5/forums/replypage/board-id/170/message-id/749141
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http://www.screencast.com/t/RUDOisSvqC
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Ref: http://forums.ni.com/t5/forums/replypage/board-id/170/message-id/749141
Attachments:
SHT75_IOWarrior.llb ‏139 KB
iowkitdll.txt ‏71 KB

Cameron... Wondering if you knnow how to get a 2's compliment for a 12 bit value in LabVIEW?
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Anyone know if I am properly sending the commands at 1, 2 and 3 of the image below?
At issue, I think, is getting the two's compliment of the two 8 bit registers at Data LSB and Data MSB using LabVIEW...
I have been working with the wizards at http://www.codemercs.com/258/?L=1 who have been EXTREMELY helpful.
They have an AWESOME I2C to USB converter that you can get OEM devices to work for your I2C project. It is a single channel version of the NI-8451
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Thanks a million!
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Attachments:
SensirionCalls.png ‏121 KB
Sensirion_Differential_Pressure_SDP6x0_Sample_Code_V1.pdf ‏97 KB
LabVIEW_IOWarrior_V150Second.zip ‏1403 KB

How does the system Validyne pressure transducer -- Validyne CD280-Dual-- SCB-68-- PCI-6024E-- LABVIEW work and how can we calibrate the pressure transducer?

Hello there,
I am completely new to the LABVIEW software.
I am learning an existing LABVIEW code of my pressure acquisition system (attached) which has the data path as following: Validyne pressure transducer --> Validyne CD280-Dual--> SCB-68--> PCI-6024E--> LABVIEW and I have some question:
1. How does the complete system from transducer to the LABVIEW work? ie if we apply the pressure at the transducer, it will change the resistance of the transducer then ....?
2. How can I find the equation which express the relationship between the pressure and the voltage at the oupt of the Validyne CD280-Dual in the LABVIEW?
3. If I want to do the calibration for the transducer, what are steps?
Thanks,
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Experiment.vi ‏143 KB
Plogger.vi ‏21 KB

Hello there,
I do not understand what subVIs you are refering to but I have tried to run the LABVIEW program using the files I attached and it worked fine (pls see the attached pressure plot).
As I mentined before, I am new to LABVIEW so maybe I do not know.
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Pressure plot.jpg ‏111 KB

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Rajat,
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Using 9472 to power pressure transducer

Can I output 10V from the 9472 to power a pressure trasducer ???
The pressure transducer uses 10mA, and the 9472 can output .75A per channel [page 17 of the manual]
Can this be done ??

Hello Vernster
The NI-9472 is a Sourcing Digital Output Module which means that the module’s digital outputs switch between an externally supplied voltage (Vsup) and ground (COM). The module itself does not supply the voltage and current. See the attached image.
This image is from page 12 of the NI 9472 manual.
The specification you mentioned is the maximum current that can be passed through one channel of the module not the maximum current the module can supply.
The NI-9472 can be used for your application if you supply the Vsup terminal with a 10V external power supply that is capable of outputting the 10 mA, however, if you want a constant power supply for your pressure transducer, it would be easier to directly power it with the external power supply.
Have a great day.
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Message Edited by Chris_K_ on 12-17-2007 06:47 PM
Message Edited by Chris_K_ on 12-17-2007 06:49 PM

Reading a thermocouple with the SCXI 1520

Does the SCXI 1520 have something to account for the interface connection heat, and is it needed? I've heard this is what the thermocouple modules do, and it is necessary.

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I Am Getting Inaccurate Readings When Some Channels of the SCXI-1520/SCXI-1314 Are Open Circuits

Am Getting Inaccurate Readings When Some Channels of the SCXI-1520/SCXI-1314 Are Open Circuits
My hardware is :-
PCI MIO 16E-1 - 1 no.
SCXI-1000 chassis - 1 no.
SCXI-1520 - 4 nos.
SCXI-1314 - 4 nos.
MAX is showing all hardware ( DAQ card + Chassis + SCXIs), set in Multiplexer mode.
I am using MAX task to configure channels ( as per requirement ) and then use the same task in Labview 7.1
When I am trying to generate task only for connected channels then reading are coming some times....... but when i generate task for all channels including (not connected channels) then the reading are either on - side or on + side (max or min).
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tell me some solution
Thanks
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No, DAQmx is superior and I strongly recommend you used DAQmx
Elijah, I guess I understood the problem that Sunder is facing, coz even I had experienced it 2 years back
What happens is if you scan only the channels to which sensors/strain gauges are connected, all is fine and you get good strain readings.
But if you happen to include an unconnected channel into the scan list, all the subsequent channels after the open channel will show saturated readings.
Right, Surender??
The problem we found, lies in the settling time of the E series DAQ card's ADC. Even we were using PXI 6071 E
Once the ADC saturates on reading an open channel, it cannot settle fast enough to read the next channel.Hence, the next channel also reads saturated value, instead of the correct value.
This is irrespective of the sampling rate because, this happened even when we did continuous sampling at low scan rates of 10 to 100 samples /sec
We found 2 solutions to this problem
Disable Simultaneous sampling and hold for the SCXI 1520 module ( using a DAQmx property node)
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Intermittent channel in SCXI-1520

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Part of the reason I don't want to send it in for evaluation is we are using it in production. (We make strain gauge based load cells.) We are expanding operations and so I've ordered an additional module and chassis. However, I will not be able to get to it till January.
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Connecting Omega PX309-10KG5V pressure transducer to SCXI 1520

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