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3,Dimension and detective diagram
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| 4. Environmental test |
| No. |
Test items |
Test condition |
Standard |
| 1 |
High temp storage test |
144 hours at + 85 ºC |
After the test and place in + 25 ºC (room temp) for 24 hours, the sensitivity and residual vibration change shall not exceed 30% compared with the initial value |
| 2 |
Low temp storage test |
144 hours at - 40 ºC |
| 3 |
High temp and high humidity storage test |
144 hours at + 65 ºC and 85 ± 5% RH |
| 4 |
Thermal shock test |
Parallel 3.9k Ω resistor at both ends of the probe, keep the temp at - 40 ± 5 ºC for 0.5h, and increase the temp to 85 ± 5 ºC within 5 minutes and keep for 0.5h.100 cycles. |
After the test and place in + 25 ºC (room temp) for 24 hours, the sensitivity and residual vibration change shall not exceed 30% compared with the initial value |
| 5 |
Vibration test |
Products bear the vibration with frequency 10-55hz, amplitude 1.5mm,and sweep rate 1oct / min, from X, Y and Z directions for each 2 hours respectively |
After the test and place in + 25 ºC (room temp) for 4 hours, the sensitivity and residual vibration change shall not exceed 30% compared with the initial value |
| 6 |
Monomer drop test |
15 free fall tests carried out from 100 ± 10cm height to 50mm thick wooden floor |
After the test and place in + 25 ºC (room temp) for 4 hours, the sensitivity and residual vibration change shall not exceed 30% compared with the initial value |
| 7 |
Strength test of outlet |
Apply 9.8N pulling force between shell and wire for 30 seconds |
The wire is not loose or falling off, the product function is normal, and the wire is not damaged |
| 8 |
Protection level |
Place the probe in 15cm deep water and soak for 24 hours |
Take out the capasual from the water and install it on the test board to measure the distance. The probe works normally without long sound. |
| 9 |
High and low temp characteristic test |
Keep the temp at -40ºC for 2h,increase to 25ºC and keep for 2h,increase to 85ºC and keep for 2h. |
After the test and place in + 25 ºC (room temp) for 2 hours, the sensitivity and residual vibration change shall not exceed 30% compared with the initial value |
| 10 |
High and low temp working test |
Under high temp 85 ºC, low temp - 40 ºC, working voltage 140 Vp-p, pulse number 20, continuous working 48 hours |
Probe works normally (sensitivity and residual vibration are within normal range) |
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| 5.Test conditions and instruments |
| No. |
Test item |
Test instruments/method |
Test condition |
| 1 |
resonant frequency |
Impedance analyzer |
ambient temperature 25 ± 5 ºC |
| 2 |
static capacitance |
LCR bridge measuring instrument |
ambient temperature 25 ± 5 ºC |
| 3 |
residual oscillation |
KT test equipment |
ambient temperature 25 ± 5 ºC |
| 4 |
sensitivity |
KT test equipment |
0.8m at room temperature, target Φ 75mm PVC pipe |
| 5 |
Angle (X & Y axis) |
KT test board, as per Fig.1 |
Under normal room temperature, the probe is 500mm from the ground, 500mm from the object to be detected, and the object to be detected is Φ 75mm PVC pipe, 1000mm high. The test environment: 2 meters in front and 1.5m in the left and right without obstacles |
| 6 |
Maximum allowable input voltage |
KT test board and Oscilloscope |
140vp-p, pulse width 0.5ms, |
| intermittent: 10ms |
| 7 |
Mean time between failures |
aging test rack |
Test temp 25±5ºC |
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