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A capillary tube thermostat is a mechanical or electronic device that controls equipment operation by sensing temperature changes through a capillary tube and a temperature-sensing bulb. Key information follows:

Operating Principle

A sealed system consists of a temperature-sensing bulb, a capillary tube, and a bellows/diaphragm, filled with a working fluid (such as Freon). After the temperature-sensing bulb detects changes in ambient temperature, the working fluid pressure is transmitted through the capillary tube to the actuator, actuating the switch contacts. Some models use a microswitch to react to fluid expansion for control, with a temperature range of 0-500°C.

Main Types

Mechanical: Models such as the WJA-400 and KTS-300, with knob adjustment, are suitable for equipment such as electric water heaters and deep fryers, with an adjustment range typically between 30-400°C.

Electronic: Models such as the Honeywell H6062A1000, feature a digital display and are used for precise temperature control.

Application Scenarios

Household Appliances: Water boilers, کوره های برقی, تهویه مطبوع, OTC.

Industrial Applications: High and low voltage switchgear, capillary tube radiant air conditioning systems (such as three-constant systems).

Parameters and Features

Capillary tube lengths typically range from 0.7 به 1.8 متر.

Contact configurations include SPST (single-pole, single-throw), with a rated voltage of up to 230V.

Purchasing References

Brands such as YAXUN and Yuduo are available on platforms like JD.com and Taobao. Prices range from $1 به $50, depending on the temperature range and number of pins (به عنوان مثال, 2-pin vs. 3-سنجاق).

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