1. Scope NTC
| This specifications cover shape, dimensions, electric characteristics etc for |
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2. Part number system
| Sensor Type | FWG2-1 | | | | | | | | | | | | | | | |
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| B Constant | 395 | 395 | = | 3950K | | | | | | | | | | | |
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| B Constant Tolerance | F | F/3=±0.3%, F/2=±0.5%, D=±0.75%, F=±1.0%, G=±2%, H=±3%, J=±5% |
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| Resistance at 25℃ | 104 | 100K | | | kohm | | | | | | | | | | | |
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| Resistance tolerance | F | F/3=±0.3%, F/2=±0.5%, D=±0.75%, F=±1.0%, G=±2%, H=±3%, J=±5% |
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| Drawing No. | 25 | / | | | | | | | | | | | | | |
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3. Electrical Characteristics
| | Item | | | | Particular | | | | Mark | | Char. | | Unit | | Tol |
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| Resistance（Rs) | Resistance at | | 25 ℃ | ( in liquid ) | | R 25 | | 100.00 | | Ω | | ± 1.0% |
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| | Resistance(re.) | Resistance at | 100 ℃ | ( in liquid ) | | R 100 | | 6.576 | | Ω | | ± -4% |
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| | B Constant | B value between t1 and t2 ℃ | | | | B25/50 | | 3950 | | K | | ± 1.0% |
| | | Bt1-t2 = | Ln(Rt1/Rt2) / [ 1/(t1+273.15)-(1/t2+273. | | | | | | | |
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| | | The time required foe the temperature of a thermi | | | | | | | | | |
| Thermal time constant. | to change into 63.2% of temp. range: 0-> 25℃ | | | τ | | 2 | | sec | | approx. |
| | | ( in stirred air) | | | | | | | | | | | | | | | |
| Dissipation constant | in still air | | | | | | | | δ | | 0.4 | | ?/K | | Max. |
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| Operating Temp range | | | | | | | | | -50 ~ | 350 | | ℃ | - |
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| The maximum power rating | in still air | | | | | | | | | | 15mW | | | | |
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| Insulation resistance | 500VDC. in air | | | | | | | | | | 50MΩ Min | | | |
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| The maximum current rating | in still air | | | | | | | | | | 2mA | | | | |
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| The maximum operating | in still air,The current for the resistance | | | | | | 0.1A | | | | |
| | current | change not to 2% | by self heating | | | | | | | | | | |
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4. Reliability chracteristics
| Testing item | | | | Test Conditions | | Changing ratio after test |
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| 4-1 High temp. aging test | Exposed in air at 200±5℃ for 1000hrs ± 4hrs. | | ΔRT | ≤ ±3% |
| | | | | | | | ΔB ≤ ±2% |
| 4-2 Low temp. aging test | Exposed in air at -50±5℃ for 1000 Hrs ± 4hrs. | | ΔRT | ≤ ±3% |
| | | | | | | | ΔB ≤ ±2% |
| 4-3 Heat cycle test | Following temp. cycle 1000 cycles continuously | | ΔRT | ≤ ±3% |
| | -30±5℃(In air,15min) | ? Room Temp.(max 5min) | | ΔB ≤ ±2% |
| | ? 200±5℃(in air,15min) | | | |
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| 4-4 Free fall | After three times natural fall to a maple board from 1m high, | | ΔRT | ≤ ±3% |
| | there should be no visible damage. | | ΔB ≤ ±2% |
| 4-5 vibration test | Frequency range : 5-50HZ , Amplitude: 7.0mm ,3g, | | ΔRT | ≤ ±3% |
| | Duration: 1 day | | | | ΔB ≤ ±2% |
| 4-6 Life test | Store | in 95%RH，60℃,DC5V, air conditions for 10000hrs | | ΔR25 | ≤ ±3% |
| | | | | | | | ΔB ≤ ±2% |
| 4-7 Waterproof test | Store | in water，70℃ , for 4000hrs | | ΔRT | ≤ ±3% |
| | | | | | | | ΔB ≤ ±2% |
| 4-8 Salt spray test | Pull 49N static weight in the direction of terminal ,for 10s | | ΔRT | ≤ ±3% |
| | | | | | | | ΔB ≤ ±2% |
5. Inspection standard
Products is inspected by landom sampling inspection plan.
| 5-1 | Sampling inspection standard | | | |
| 5-2 | Sampling inspection type | | | |
| 5-3 | Acceptable quality level | | | |
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| | | Inspection item | Level | | AQL |
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| | | Resistance | | | |
| | | | BELLOW 50KP : n=32(C=0), 50 ~ 100KP : n=64(c=0) | |
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| | | B Constant | ABOVE 100KP:n=96(c=0) | |
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| | | Shape & Dimensions | n=10(c=0) | |
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| | | Appearance | G-II | | 1.0%(c=0) |
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6. Packing & Marking
6-1 Packing
Packing and package shall be enough so that damage or soil will not be caused by transporting. See attached Taping & Packing spec
6-2 Marking
Shall be marked P/N, Quantity,DATE, Lot No. etc on packing box.
7. Appendix
| 7-1 | : Drawing |
| 7-2 | : R-T TableRt=Rs * exp( A+B/T+C/T^2+D/T^3), T in degrees Kelvin |
| | A= | -13.738 | | | | |
| | B= | 3621.962 | | | | |
| | C= | 345637.777 | | | | |
| | D= | -60908403.697 | | | |
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8. Appendix
| TYPE | A(mm) | B(mm) | D(mm) |
| FWG2-1 | 1.25 | 2.5MAX | 0.25 |
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| FWG2-2 | 2.00 | 4MAX | 0.3 |
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| FWG2-3 | 0.85 | 2.0MAX | 0.15 |
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NTC thermistor diameter of 0.8 MM FUWEN shenzhen rich temperature sensing technology co., LTD
