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Economical solid state pressure sensors

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kleh(at)dialupatcost.ca
Guest

Posted: Tue Jun 03, 2014 4:55 am Post subject: Economical solid state pressure sensors

I only seem to get a few hundred hours out of name brand 

electromechanical engine pressure sensors so I tried a 30 psi $25. solid 

state Chinese sensor for coolant pressure monitoring. Quite a bit 

cheaper than what I was using and seemingly good specifications which 

I've copied below. While it calibrates perfectly at room temperature, it 

reads at least 5 psi low when it gets hot (ie. 4 psi when it should be 

9). The zero point changes similarly and I confirmed all this with raw 

voltage readings and scope traces to make certain. This sensor was 

mounted on the firewall and tee'd into a 5/16" coolant hose so the 

coolant likely warmed it up to about 80*C. Seems it would need to be 

installed on a stub line on the cool side of the firewall to be useful. 

The temperature specification of Maximum:0.05%FS/ºC would indicate up to 

1.5 psi zeroing error over a 100*C range which would be acceptable to me 

if that was the case and other errors were minor. This particular sensor 

may be outside of stated tolerances. In any case, the compensation 

temperature range of -20 to +80*C seems to be meaningless. I'd also 

hoped to replace the oil pressure sensor but it seems these economical 

sensors are not the answer for under the cowl.



Ken



Brand new pressure transducer. 316 Stainless steel body.

Input: 0-30 psi(Gauge Pressure);

Output: 0.5-4.5V linear voltage output. 0 psi outputs 0.5V, 15 psi 

outputs 2.5V, 30 psi outputs 4.5V.

Works for oil,fuel or air pressure.Can be used in oil tank,gas 

tank,diesel tank etc.

Accuracy: +/-1%FS;

Thread: 1/8” NPT;

Wiring Connector: Packard plug-in unit is included;

Wiring: Red: +5V; Black: ground; Green: signal output;

It's an advance pressure sender than traditional mechanical pressure sender;

Overload Capacity: 2-4 times;

Working Temperature: -40—+120ºC;

Compensation Temperature: -20—+80ºC;

Protection Class: IP67;

Pressure Medium: The gas and liquid which is compatible with 316L 

stainless steel;

Load Resistance: ≤((supply power-6.5V/0.02A)Ω;

Long-term stability: Less than 0.1%FS/year;

Temperature Effect on Zero: Typical:0.02%FS/ºC; Maximum:0.05%FS/ºC;

Temperature Effect on Sensitivity: Typical:0.02%FS/ºC; Maximum:0.05%FS/ºC;

Shock Resistance: 1000g;

Anti-Shock: ≤+/-0.01%FS(X,Y,Z axes, 200Hz/g);

Response Time: ≤1ms;

Insulation Resistance: >100mΩ  500VDC;

Weight: 55g;

Explosion-proof Class: ExiaTTCT6;

Electromagnetism Compatibility: EN50051-1.

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nuckolls.bob(at)aeroelect
Guest

Posted: Tue Jun 03, 2014 10:23 am Post subject: Economical solid state pressure sensors

At 07:55 AM 6/3/2014, you wrote:




I only seem to get a few hundred hours out of 

name brand electromechanical engine pressure 

sensors so I tried a 30 psi $25. solid state 

Chinese sensor for coolant pressure monitoring. 

Quite a bit cheaper than what I was using and 

seemingly good specifications which I've copied 

below. While it calibrates perfectly at room 

temperature, it reads at least 5 psi low when it 

gets hot (ie. 4 psi when it should be 9). The 

zero point changes similarly and I confirmed all 

this with raw voltage readings and scope traces 

to make certain. This sensor was mounted on the 

firewall and tee'd into a 5/16" coolant hose so 

the coolant likely warmed it up to about 80*C. 

Seems it would need to be installed on a stub 

line on the cool side of the firewall to be 

useful. The temperature specification of 

Maximum:0.05%FS/ºC would indicate up to 1.5 psi 

zeroing error over a 100*C range which would be 

acceptable to me if that was the case and other 

errors were minor. This particular sensor may be 

outside of stated tolerances. In any case, the 

compensation temperature range of -20 to +80*C 

seems to be meaningless. I'd also hoped to 

replace the oil pressure sensor but it seems 

these economical sensors are not the answer for under the cowl.



    I have one of those transducers in a 300 psi version . . .

    in fact . . . it's in my pocket right now. We ordered

    it in to consider for a future development program.

    I'll see if I can get a quick look-see on accuracy

    and temperature effects.



    The numbers you're citing are pretty poor . . . I can't

    imagine anyone putting so much into a stainless case

    and cutting short the electronics . . . electronics

    that are pretty much jelly-bean parts. If you're going

    to round-file the aberrant transducer, drop it to

    me in the mail . . . I'd like to peek at it on the

    bench too.



   Bob . . .

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