 |
データシートサーチシステム |
|
|
データシートサーチシステム |
|
N_06Q00223 データシート(PDF) 8 Page - AVX Corporation |
|
||||||||||||||||||||||||||||||
N_06Q00223 データシート(HTML) 8 Page - AVX Corporation |
|
|
8 / 38 page  7 LIQUID LEVEL OR FLOW DETECTION The dissipation of a thermistor is significantly different in a liquid or in a gas, in a static fluid or in a stirred one. A liquid level detector or a gas–flow measurement can be designed using this property. In Figure 11, the output voltage measured on the thermistor depends upon the dissipation factor of its environment, and can be illustrated by V-l curves (Figure 12). This voltage can be used to detect the presence (V 2) or absence (V 1) of liquid around the thermistor or measure the flow speed. A good design should define a precise operating temperature range, where dissipation in the high dissipating medium at highest ambient temperature remains higher than the dissipa- tion in low dissipating medium at lowest ambient temperature. SURGE PROTECTION A soft start of sensitive apparatus can be achieved by using NTC thermistors as described in Figures 13 and 14. At turn-on, the NTC absorbs the surge current, limits the current across the equipment and protects it. Then, the thermistor heats, its resistance decreases and most of the power becomes applied to the apparatus. In its design, the thermistor will be selected with a thermal capacity higher than the surge energy to absorb. TIME DELAY The current-time characteristic of a thermistor is used in time delay applications such as delaying energization of a relay after application of power to an electrical circuit. The time delay, time necessary for the thermistor to heat up to the temperature where its resistance allows the current to reach the switching value of the relay, is mainly defined with the nominal resistance of the thermistor. The time delay is also strongly dependent upon the ambient temperature, as shown in Figure 15. Figure 11 Figure 12 Figure 15 Current T = 50 °C T = 40 °C T = 25 °C Time Voltage Vin V2 V1 Vin/RS Current k2 k1 Vin RS RNTC V NTC Thermistors Application Notes Figure 13 Figure 14 RNTC Equipment Power Unprotected equipment Protected equipment NTC absorbed power Time |
同様の部品番号 - N_06Q00223 |
|
同様の説明 - N_06Q00223 |
|
|
リンク URL |
| プライバシーポリシー |
| ALLDATASHEET.JP |
| ALLDATASHEETはお客様のビジネスに役立ちますか？ [ DONATE ] |
Alldatasheetは | 広告 | お問い合わせ | プライバシーポリシー | リンク交換 | メーカーリスト All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Japanese ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
