Pressure transducer

Simon Diagnostician United Kingdom Posted   Latest   Edited  

Hi everyone I'm looking to build my own pressure transducer for in-cylinder testing and I have found a PT 0-400 bar range but it's output is in mA and not volts , now how do i set scope up for this shall I just use the amp clamp input?? Sorry if it's a stupid question. 

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Brandon Diagnostician
Pennsylvania
Brandon Default
 

Sorry Simon, I don’t know how I can help. how Many wires interfaces with this device?

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Simon Diagnostician
United Kingdom
Simon Default
 

Hi , it's just a power and ground and a signal output 4-20mA output, power input 8v-32v.

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Mario Diagnostician
Florida
Mario Default
 

I don't see how that's going to end well. If you'd like i can sell you my 5v regulated style transducer setup. It's a custom box, 12v power supply. Two transducer inputs, one vacuum input. Two pressure sensors. I don't use it anymore since I've upgraded. But you also didn't mention what scope it was for. Anyway if you're interested let me know

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Simon Diagnostician
United Kingdom
Simon Default
 

Why would it be bad ??

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Mario Diagnostician
Florida
Mario Default
 

Oops didn't see the spec sheet until now. What scope?

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Simon Diagnostician
United Kingdom
Simon Default
 

I have a pico , Snap on zeus, modis, vantage pro, and a bosch kts650.

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Randy Curriculum Developer
North Carolina
Randy Default
 

If you could please send me some specifics about that transducer including manufacturer and part number I'll see if I can clarify that for you. I suspect the output is actually varying voltage but the application or possibly the description documents confuse the raw output of the sensor.

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Simon Diagnostician
United Kingdom
Simon Default
 

This is the spec sheet

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Mike Mobile Technician
South Carolina
Mike Default
 

This is interesting. So does this unit have 3 wires? I'm assuming a power & ground, and then a signal out?

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Dmitriy Analyst
Ontario
Dmitriy Default
 

Hi Simon, sorry to say that but I have some disappointing news, and they are not about 4-20mA issue. 400 bars is about 5800psi. With stated accuracy +/-0.5% of FS (full scale), that is 30psi. You are likely to have issues with accuracy in the region of interest for in-cylinder testing, 0-200psi. Some of the errors may be offset or calibrated out, but be ready for that. The next issue is

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Simon Diagnostician
United Kingdom
Simon Default
 

Thank you for that explanation , I understand more now.

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Stephen Engineer
New Mexico
Stephen Default
 

Hi Simon, I'd like to echo everything that Dmitriy has said and just add to and round out the info that he's provided. I would add this; 4-20ma type devices are commonly used in industrial applications (think like a large factory maybe) where there might be a large amounts of electrical noise from all kinds of motors and devices running and or long distances between where the device is and the

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Simon Diagnostician
United Kingdom
Simon Default
 

Hi yes makes more sense now thank you

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Christopher Technician
Texas
Christopher Default
   

I'm actually thinking about doing the same thing, but with a TE M5200 transducer (several options for electrical & hose connections, pressure ranges, as well as supply & output voltage). What are you using for a power supply? Datasheet link: te​.​com/commerce/Docum… FYI, it's not on the datasheet, but an engineer at TE told me the resolution is 1KHz. Also, one of the listed

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Keith Diagnostician
Oklahoma
Keith Default
 

I have made my own transducer setup, including a separate 5v power supply that allows for 2 devices(transducer, map sensor, etc.) I have tested about a dozen different types of transducers, from $12 to $200..... Some important things I looked for were a ratio-metric linear voltage output compound transducer that operated in 5-15vdc range. A ratio metric linear voltage output sensor allowed

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Simon Diagnostician
United Kingdom
Simon Default
 

Thanks for the reply I appreciate all the info people have given .

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Christopher Technician
Texas
Christopher Default
 

Which transducer did you ultimately go with?

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Simon Diagnostician
United Kingdom
Simon Default
 

I think I'm gonna just go with the wps500 and need to cover diesel and petrol

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