传感器与传感模块批发供应商
在Towobo上从经过验证的制造商批量采购温度传感器、压力传感器、接近传感器、流量传感器、运动传感器（IMU）和IoT传感模块。全球传感器市场超过2000亿美元。
Sensor categories and key specifications
Sensor products for wholesale sourcing span a broad range of physical measurement principles: temperature sensors — thermocouples (Types J, K, T, E, N, R, S for high-temperature industrial applications), Pt100/Pt1000 RTDs (precision resistance temperature detectors, -200°C to +600°C), NTC thermistors (compact negative temperature coefficient sensors, -40°C to +125°C, used in HVAC and consumer electronics), IC temperature sensors (LM35, DS18B20, TMP117 — direct digital output, simplified measurement, used in PCB-level temperature monitoring); pressure sensors — piezoresistive MEMS sensors (gauge, absolute, differential — 0–10 mbar to 0–1000 bar range, I²C/SPI or 4–20mA/0–10V output), capacitive pressure sensors (for low differential pressures, high accuracy), piezoelectric sensors (for dynamic pressure measurement); proximity and position sensors — inductive proximity switches (for metal target detection), capacitive proximity switches (for liquid level and non-metallic targets), photoelectric sensors (through-beam, retroreflective, diffuse), magnetic Hall effect sensors, and LVDT/RVDT displacement transducers; motion and inertial sensors — accelerometers (MEMS, ±2g to ±400g), gyroscopes (MEMS, degrees/second), IMU modules (combined accelerometer + gyroscope ± magnetometer); and gas and chemical sensors — O2, CO, CO2 (NDIR), VOC (electrochemical and photoionisation), H2, and combustible gas sensors for industrial safety and air quality monitoring.
IP protection, ATEX certification, and industrial vs consumer grade
Industrial sensor purchasing requires attention to several critical specifications beyond the basic measurement parameters. IP (Ingress Protection) rating: IP67 (dust-tight, water immersion to 1m for 30 minutes) is the minimum for most industrial sensor installations; IP69K (high-pressure, high-temperature water wash-down resistant) is required for food processing and washdown environments. ATEX certification (Atmosphères Explosibles — EU Directive 2014/34/EU) is required for sensors used in potentially explosive atmospheres — common in oil and gas, chemical plants, grain handling, and paint booths. ATEX zones: Zone 0/1/2 for gas/vapour/mist hazardous areas; Zone 20/21/22 for dust. IECEx is the international equivalent of ATEX. SIL (Safety Integrity Level) rating (IEC 61508, IEC 61511) is relevant for sensors in safety instrumented systems (SIS) in process industries. Industrial sensors from Siemens, Endress+Hauser, WIKA (Germany), Honeywell, TE Connectivity (USA), and Keyence (Japan) cover the premium end. Mid-tier industrial sensors from Chinese manufacturers (Turck China, Autonics, FineSME) offer competitive pricing for general industrial applications. For IoT and smart building applications, MEMS-based sensor modules from Chinese manufacturers (Winsen Electronics for gas sensors, Sensirion China operations, InvenSense/TDK-based IMU modules) offer good performance-cost ratios for non-critical applications.
Frequently asked questions
What is the difference between a sensor and a sensor module?
A sensor is the fundamental transducer element that converts a physical quantity (temperature, pressure, proximity) into an electrical signal — typically an analogue voltage, current (4–20mA), resistance change, or capacitance change. A sensor module combines the sensing element with signal conditioning electronics (amplifier, ADC, microcontroller) to provide a processed digital output (I²C, SPI, UART, Modbus RTU) or standardised analogue output (0–10V, 4–20mA). Sensor modules simplify integration into electronic systems — the BMP280 (pressure + temperature, I²C/SPI) and AHT20 (humidity + temperature, I²C) are examples of compact sensor modules widely used in IoT devices. Industrial sensor modules additionally include the mechanical housing, connector (M12), and EMC shielding required for installation in industrial environments.
What is a typical MOQ for wholesale sensors from China?
Standard industrial proximity sensors (inductive, capacitive, photoelectric — M12 or M18 barrel type): 10–50 pieces minimum from Chinese manufacturers. Temperature sensors and transmitters (PT100 RTD, 4–20mA output): 10–50 pieces. Pressure transmitters (gauge or absolute, 4–20mA): 10–50 pieces. MEMS sensor ICs and bare sensor chips: 100–500 pieces in tape-and-reel. IoT sensor modules (complete PCB-based modules with communication interface): 50–200 pieces. Gas sensor modules: 20–100 pieces. Complete sensor assemblies with housing and cable: 10–50 units. For large automation projects requiring hundreds or thousands of identical sensors, direct manufacturer sourcing on Towobo offers significant cost advantages over distributor pricing.
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