Factory Original Corrosion Resistant Temperature Sensing Bulb Assembly for Capillary Thermostat

• Customization: Available
• Certification: CE
• Brand: Thermal International
• Model NO.: BS-302
• Applicable Temperature: -35℃~180℃
• Over-Temperature Tolerance: Can Withstand Set Temperature +40℃ (Short Time)
• Sensing Medium Pressure: 0.1~1.7MPa (Varies with Temperature)
• Bellwall Pressure Resistance: ≥1.0MPa (Some Models Can Reach 7MPa)
• Temperature Error: ±2~4℃ (High Precision Models Can Reach ±1.5℃)
• Response Time: ≤7s (Static Environment)
• Transport Package: Carton Packaging
• Specification: Temperature Sensing Bulb Assembly
• Trademark: Thermal International
• Origin: China
• HS Code: 73219000
• Production Capacity: 50000PCS/Week
• Package Size: 45.00cm * 40.00cm * 40.00cm
• Package Gross Weight: 15.000kg

Product Description

Product Description

Factory Original Corrosion Resistant Temperature Sensing Bulb Assembly for Capillary Thermostat

The Temperature Sensing Bulb Assembly of Capillary Thermostat is the core sensing and actuating component of a mechanical temperature control system. It achieves automatic temperature control of the equipment through the physical principle of "temperature → pressure → mechanical action," and is commonly found in various devices requiring constant temperature or overheat protection.

Working Principle: 
Achieved entirely through physical thermal expansion and contraction: 
When the temperature of the measured area rises, the medium inside the sensing element expands due to heat, and the pressure is transmitted to the bellows through the capillary tube; 
The bellows elongates under pressure, triggering a linkage mechanism (such as a microswitch or gas valve) to adjust the equipment's operating state (such as reducing the heat output or shutting down the compressor); 
When the temperature drops, the medium contracts, the bellows resets, and the equipment returns to its original operating state.

Core Advantages: 
1. Electrical-free Safety: Purely mechanical structure, no power supply required, suitable for gas appliances, explosion-proof equipment, etc.; 
2. Environmentally Resistant: Metal material is corrosion-resistant and vibration-resistant, and can withstand high and low temperatures (-35℃~180℃); 
3. Cost-effective: Simple structure, high cost-performance for mass production, making it the mainstream choice for household appliances.

Specification

Product Name	Temperature Sensing Bulb Assembly / Bellows Sensor
Temperature Sensing Bulb	Diameter: Commonly Φ6~16mm (e.g., gas water heaters are mostly Φ8~12mm); Length: 75~250mm (some longer models can reach over 300mm).
Capillary Tube (connecting tube)	Diameter: Φ2~4mm (mainly copper); Length: Standard 2m, customizable 3~7m (up to 10m)
Bellows Components	Diameter: Φ10~25mm; Length: 20~50mm (compression/expansion stroke approximately 5~15mm)
Temperature Range	Applicable Temperature: -35℃~180℃ (Gas water heaters commonly use 40~100℃, air conditioners commonly use 0~70℃) Over-temperature Tolerance: Can withstand set temperature +40℃ (short-term).
Pressure Parameters	Temperature sensing medium pressure: 0.1~1.7MPa (varies with temperature); Bellows pressure resistance: ≥1.0MPa (some models can reach 7MPa);
Control Accuracy	Temperature error: ±2~4℃ (high-precision models can reach ±1.5℃); Response time: ≤7s (static environment).
Materials	Temperature sensor/capillary tube: Copper, chrome-plated copper (corrosion resistant); Bellows: Phosphor bronze, stainless steel (high temperature/high pressure resistant).
Interface specifications	Threads: M8, G1/2, etc. (for equipment mounting holes); Connection methods: Flange, compression fitting, etc. (commonly used in industrial equipment).

Product Pictures

Packaging & Shipping

Certifications

FAQ

FAQ

Q1 Are you trader? 
A1 We are factory.
 
Q2 What's your lead time for 5000pcs?
A2 We need around 20days after down payment received. .
 
Q3 You payment term?
A3 We accept LC, T/T 20% remittance +80% before delivery, DP.
 
Q4 Can we print our LOGO on heating element?
A4 Yes.
 
Q5 Do you offer guarantee? 
A5 Yes. We offer 1 year guarantee.