Datasheet > N_03J00681

N_03J00681

更新时间： 2022-03-22 06:51:07

品牌	Logo	应用领域
京瓷/艾维克斯 - KYOCERA AVX		/
页数	文件大小	规格书
38页	823K
描述
NTC Thermistors

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N_03J00681 数据手册

NTC Thermistors

Application Notes

R_S

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.

R_NTC

V_in

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).

Figure 11

This voltage can be used to detect the presence (V₂) or

absence (V₁) of liquid around the thermistor or measure the

flow speed.

Voltage

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.

Current

in/R

Figure 12

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.

R_NTC

In its design, the thermistor will be selected with a thermal

capacity higher than the surge energy to absorb.

Equipment

Figure 13

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.

Power

Unprotected equipment

Protected equipment

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.

NTC absorbed power

The time delay is also strongly dependent upon the ambient

temperature, as shown in Figure 15.

Time

Figure 14

T = 50°C

Current

T = 40°C

T = 25°C

Time

Figure 15

1...5 6 789 10 11...38

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