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Help CenterCHNTEK QTB251-B Sputtering Thin Film Pressure Sensitive Element
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The strain resistances are sputtered directly on the 17-4ph stainless steel substrate by using MEMS (micro-mechanical and micro-electronic) technology. The stress on the substrate produces elastic deformation and outputs a millivolt-level signal which is linearly related to the measured pressure. With the characteristics of good long-term stability, high reliability and small size, QTB251 has a wide range of applications, especially for pressure measurement in automotive electronic stability system (ESP) and electronic hydraulic braking system (EHB).
l Circuit principle and pin definition
Pin No. |
1 |
2 |
3 |
4 |
5 |
Function code |
V- |
S+ |
V+ |
S- |
Vt |
Function definition |
Negative power supply |
Positive output |
Positive power supply |
Negative output |
Temperature Sensitive Signal |
Note: Temperature sensitive resistor is optional
l Product parameters
measured media |
Gas and liquid compatible with stainless steel |
||
measuring range |
25MPa |
||
accuracy |
±0.2%FS、±0.5%F |
Insulation resistance |
≥1000MΩ/500V DC |
nonlinearity |
0.1%FS、0.2%FS |
breakdown pressure |
500%FS |
hysteresis |
0.1%FS |
Permission overload |
200%FS |
repeatability |
≦0.1%FS |
mechanical vibration |
20g（20～5000HZ) |
sensitivity |
1.6～2.4mV/V |
response time |
≤0.1ms |
long-term stability |
≤±0.1%FS/year |
material |
17-4PH |
operating temperature |
-40～+125℃ |
reliability |
Resistant to 1 million shocks |
Zero temperature drift |
±0.03%FS/℃ |
Overall dimensions |
Outside diameter of strain surface : 5mm, Outside diameter of the step : 7.5mm, height : 5mm |
full scale temperature drift |
±0.03%FS/℃ |
identifiability |
Unique ID code, which can be used to query the manufacturing, testing and calibration information of the chip. |
l Product Selection
Accuracy Level
code |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
|
Accuracy level （FS%） |
2.0 |
1.0 |
0.5 |
0.2 |
0.1 |
0.05 |
0.02 |
0.01 |
Temprature Level
|
Code (The first digit) |
temperature upper limit(℃) |
Code (The second digit) |
temperature lower limit(℃) |
1 |
0 |
1 |
+85 |
2 |
-10 |
2 |
+105 |
3 |
-25 |
3 |
+125 |
4 |
-40 |
4 |
+150 |
Measuring range representation: three digits, the third digit represents the number of zeros after the first two digits, and the unit is Pa
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