Bill,
Refering to the relation of your test hole to the air source: If you place an orifice on the edge of your test hole nearest the air source, then move the orifice to the oposite edge of the test hole, the flow rate through your orifice may change because of the different angles the air can take through the test hole to the air source. If the air source is located directly below the test hole, this angle does not change.
John
KISS Pitot bench design
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by Nick » Tue Dec 20, 2005 3:14 am
I've been looking for sensors, where did you get yours? I was just looking at the Dataq site. I would be interested in doing something very similar. I saw you can also export data directly to excel.
Nick
Nick
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by 86rocco » Tue Dec 20, 2005 11:14 am
I recognize those sensors, they're the MPX2010DP by (aka Motorola), they're 0-10 mB differential pressure sensor, they're available from for $14.43 each. Personally, I'd prefer the MPX5010DP sensor instead, it's very similar except that it's output is amplified to fall inside the range of 0-5v, they're also available from digikey for $18.34.
There are also a couple of nice sensors in the Freescale MPXV7000 series, these sensor are similar to the MPX5000 series except they are bidirectional for example, the MPXV7007DP's range goes from -7.0 to + 7.0 mb, so there'd be no need to swap hoses or the like when switching from intake to exhaust. Honeywell also has some very nice bidrectional sensors but they tend to be a bit more pricey and harder to come by.
There are also a couple of nice sensors in the Freescale MPXV7000 series, these sensor are similar to the MPX5000 series except they are bidirectional for example, the MPXV7007DP's range goes from -7.0 to + 7.0 mb, so there'd be no need to swap hoses or the like when switching from intake to exhaust. Honeywell also has some very nice bidrectional sensors but they tend to be a bit more pricey and harder to come by.
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by Nick » Wed Dec 21, 2005 12:22 am
My brothers are computer nuts, and insist that my old school manometers could be replaced with electronics to make life easier. So here is my question. If I used the sensors that had amplified voltage already, how do I wire it up. I was thinking that 2 pins go to 5v power and the other 2 go to the Data. Is it that easy? Are you willing to share your schematics? I'm not trying to put John out of business here, But I've built everything else on this property, so why stop now.
Nick
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by 86rocco » Wed Dec 21, 2005 7:50 am
If your brothers are true computer geeks, you're more than halfway there, the toughest part is getting the software right, the hardware's easy.
First you'll need something to hook the sensors up to, a data aquistion device, personally I'll be using the but that's really overkill for this job, make a couple nice low cost units, either the DI-194RS or the DI-148U should do nicely. Then of course you'll need the the sensors, something like the , that sensor requires only 3 wires, a +5v supply voltage, signal voltage and a ground which is shared by both the supply and signal circuits. Hook the power and ground to the sensor with a decoupling capacitor close to the sensor, also hook the same ground up to the signal ground of the data logger and the signal voltage up to one of the analog inputs of the data logger.
First you'll need something to hook the sensors up to, a data aquistion device, personally I'll be using the but that's really overkill for this job, make a couple nice low cost units, either the DI-194RS or the DI-148U should do nicely. Then of course you'll need the the sensors, something like the , that sensor requires only 3 wires, a +5v supply voltage, signal voltage and a ground which is shared by both the supply and signal circuits. Hook the power and ground to the sensor with a decoupling capacitor close to the sensor, also hook the same ground up to the signal ground of the data logger and the signal voltage up to one of the analog inputs of the data logger.
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