China Manufacturer of Air Conditioning Temperature Sensor

The following is the core technology analysis and application guide of air conditioning temperature sensor, comprehensive structure, principle and selection points:
Air conditioning temperature sensor 5K 10K 15K 20K 50K 100K Air Conditioner Tube Sensor rubber head copper head.

TPE temperature probe 2K, 5K, 10, 100K air conditioning temperature sensor

Air Conditioning Temperature Sensor 5K, 10K, 15K, 20K, 50K NTC Sensor Probe

In+Out TC 100K Air Conditioner Temperature Sensor For Samsung Haier Hitachi LG

eu. Core type and functional positioning

Sensor type‌	Installation location	Core function	Typical resistance (25℃)
Indoor ambient temperature sensor	Indoor unit air inlet	Monitor room temperature, control compressor start/stop/frequency conversion operation	5KΩ/10KΩ/15KΩ
‌Indoor pipe temperature sensor‌	Evaporator copper tube surface	Refrigeration anti-freezing, heating anti-cold wind, control indoor unit wind speed	Same ambient temperature or higher
Outdoor ambient temperature sensor	Back of outdoor unit condenser	Monitor ambient temperature, adjust outdoor unit fan speed	10KΩ~50KΩ
‌Compressor exhaust temperature sensor	Exhaust pipe metal surface	Monitor exhaust temperature (＞150℃), prevent overheating protection	50KΩ/100KΩ
Outdoor pipe temperature sensor	Condenser coil	Defrost control and overheating protection	10KΩ~50KΩ

Nota:
Household air conditioners are mainly based on NTC thermistors (temperature↑resistance↓);
The resistance of different sensors of the same air conditioner may be different (such as Panasonic inner ring temperature is usually 15KΩ, tube temperature is 25KΩ).

II. Key performance parameters and selection
‌Accuracy requirements‌
Ambient temperature sensor: ± 0,5 ℃ (±0.1℃ for high-precision models);
Pipe temperature sensor: ±1℃ (key for anti-freeze protection).

‌Temperature range‌
Conventional environment: -30℃~+80℃ (epoxy resin encapsulation);
High temperature area: exhaust gas sensor needs to withstand 150℃↑ (glass seal/gold electrode encapsulation).
‌
B value selection‌
Standard B value: 3435K/3950K, affecting the slope of the temperature-resistance curve;
High B value (4100K) improves the sensitivity in the high temperature zone.

III. Typical faults and diagnostic logic
mermaid Copy Code
graph LR
A[Air conditioning abnormal protection] –> B[Check sensor resistance]
B –> C{Measured resistance at 25℃}
C — Deviation from nominal value ±3%↑ –> D[Replace sensor]:ml-citation{ref=”11″ data=”citationList”}
C — Normal –> E[Check the connection line]
E — Open circuit/short circuit –> F[Maintenance harness]:ml-citation{ref=”8″ data=”citationList”}
E — Normal –> G[Mainboard ADC failure]:ml-citation{ref=”9″ data=”citationList”}

‌Case‌: Haier air conditioner internal unit pipe temperature sensor nominal 10KΩ, if the actual measurement <9.7KΩ or >10.3KΩ, it needs to be replaced.

Iv. Installation and maintenance specifications
‌Positioning criteria‌
The ambient temperature sensor needs to be exposed to the air flow and avoid local heat sources;
The pipe temperature sensor must fit tightly to the copper tube (filled with thermal conductive silicone grease).
‌Replacement steps‌
Turn off power → remove the control board → unplug the plug → replace the new sensor → restore the test;
It is strictly forbidden to bend the lead (which may cause internal fracture).

V. Technology Evolution Direction
‌Multi-sensor Fusion‌: The new air conditioner uses 4-6 sensors to link and realize dynamic temperature control through spatial temperature field modeling;
‌Intelligent Calibration‌: Automatically detect sensor resistance drift when powered on, and software compensation improves long-term stability.

‌Appendix: Resistance Quick Comparison Table‌