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Quick Response Auto Air-conditioning In-car Temperature Sensor 2k Ohm 3914
Working Principle Of The In-car Temperature Sensor 2k Ohm 3914
The working principle of the outside temperature sensor is the same
as that of the inside temperature sensor.
Sensors outside the car are generally installed in the front bumper
or before the radiator, and are easily affected by the environment,
so they are wrapped in an injection-molded resin case to avoid
responding to sudden changes in temperature. This will enable it to
accurately detect the average temperature outside the car. In
addition, some models have anti-fake input circuits inside the
air-conditioning computer
Input element of automatic air conditioner
①The temperature sensor inside and outside the car: It is a
negative temperature coefficient thermistor sensor, used to sense
the temperature inside and outside the car. When the temperature
changes, the resistance changes, and the temperature signal is sent
to the air-conditioning electronic control unit ECU.
②Evaporator temperature sensor: It detects the temperature of the
air passing through the evaporator or the temperature change on the
surface of the evaporator, and controls the coupling or
disconnection of the electromagnetic clutch of the compressor. The
signal is sent to the electronic control unit (ECU) to control the
fan speed at low temperatures.
Features Of The In-car Temperature Sensor 2k Ohm 3914
【Application description】Measure the temperature change of the air
conditioner;
[Assembly method] The wiring harness is tied and fixed.
● The temperature control response speed is fast.
● Good moisture and water resistance.
● The assembly method is simple and firm.
CWF202F3914FD400BC Specification
| Material Name | Item/PN |
| Lead wire | 2651 #20AWG TS 21*0.18mm ,OD:1.85*3.8mm ,105℃ 300V Grey White |
| Thermistor | R0=6.65KΩ±1.5% R25=2KΩ±3.5% B0/25=3914K±1% MF52 |
| Epoxy Resin | J105/J106B/J05X G108/GU01 Black |
| Item | Sign | Test Conditions | Min. | Normal value | Max. | Unit |
| Resistance at 0℃ | R0 | Ta=0±0.05℃ PT≦0.1mw | 6.55 | 6.65 | 6.75 | kΩ |
| Resistance at 25℃ | R25 | Ta=25±0.05℃ PT≦0.1mw | 1.93 | 2 | 2.07 | kΩ |
| B Value | B0/25 | 3874 | 3914 | 3953 | k | |
| Dissipation factor | σ | Ta=25±0.5℃ | 1.5 | / | mw/℃ | |
| Time constant | τ | Ta=25±0.5℃ | / | / | 3 | sec |
| Insulation resistance | / | 500VDC | 100 | / | / | MΩ |
| High-voltage Insulation Test | / | 1500VAC | 5 | Sec | ||
| Operating temp.range | / | / | -10 | / | +100 | ℃ |
Series Parameters Of The In-car Temperature Sensor 2k Ohm 3914
| Zero power resistance accuracy at 25°C | ±1% |
| B value accuracy | ±1% |
| Tip material | Epoxy |
| Wire specifications | FEP or PVC |
| Product withstand voltage | ≥1500V/AC |
| Operating temperature | -40～+105/150℃ |
Water temperature sensor function
①Measure the temperature of the heat exchanger core and correct the
position of the mixing door. Some models use
The engine water temperature sensor is replaced.
②Protection function to prevent the compressor from working under
high temperature. Some models adopt
Use engine water temperature sensor instead, some models use water
temperature switch instead.
③Control the fan. When the water temperature is too low, the system
will start the fan preheating control. also
That is, when the water temperature is too low, and in heating
conditions, in order to prevent the blowing wind from being cold,
when the water temperature is lower than the set temperature of the
system, the wind machine will work at low speed or not work. Some
models use engine water temperature sensors instead, and some
models use water temperature switches instead.
Evaporator temperature sensor function
The FAW-Toyota Corolla automatic air conditioner is equipped with
an evaporator temperature sensor, and some automatic air
conditioners are not installed. The evaporator temperature sensor
is used to measure the surface temperature of the evaporator,
correct the position of the mixing door, and control the
compressor. When the surface temperature of the evaporator is lower
than a certain value, the compressor will not work and prevent
frost on the evaporator surface.
Note: Some models have two evaporator temperature sensors, one of
which is used to correct the position of the mixing door, and the
other is used to prevent the evaporator from frosting
