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N_09R00103 Datasheet(PDF) 8 Page - AVX Corporation

Part No. N_09R00103
Description  NTC Thermistors
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Maker  AVX [AVX Corporation]
Homepage  http://www.avx.com
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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




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