BJW51 Type Mechanical Explosion-Proof Temperature Controller
The BJW51 type mechanical explosion-proof temperature controller is specifically designed for explosive hazardous environments. It employs a reliable mechanical temperature sensing principle, requires no external power supply, and can automatically control the medium temperature in pipelines or tanks. It is an ideal automatic control component for process heat tracing or freeze protection in industries such as petroleum and chemical.
This product is an explosion-proof temperature controller compliant with the GB3836-2000 national standard, with an explosion-proof marking of "ExnAnCIICT6Gc". It is mainly composed of components such as the core housing, terminal box, base, temperature control element, temperature sensing capillary tube, and temperature adjustment knob. Its core working principle is to sense the controlled medium temperature via a temperature bulb, utilizing the thermal expansion and contraction of an internal liquid working medium to drive the opening and closing of mechanical contacts (T1, T2), thereby achieving automatic power supply cut-off and restoration for precise temperature control. The product structure incorporates both flameproof enclosure and resin encapsulation (potting) protection, ensuring safety for use in hazardous locations.
Main Industries: Petroleum, chemical, natural gas, pharmaceutical, and other industries with explosion risks.
Hazardous Area: Applicable in Zone 2 explosive gas mixture environments, with a temperature class of T3 to T6.
Specific Use: Used for automatic control of the medium process temperature in pipelines or tanks. Typically applied for the start/stop control of electric heat tracing systems, achieving heat tracing, temperature maintenance, or freeze protection.
Intrinsic Safety Explosion-Proof: Features the "ExnAnCIICT6Gc" explosion-proof marking. It adopts a composite structure of flameproof enclosure and resin potting, ensuring safe use in specified explosive gas environments.
Mechanical Drive, Reliable and Maintenance-Free: Pure mechanical working principle, requires no external power supply. Simple structure, reliable operation, strong anti-interference capability, essentially maintenance-free.
Automatic and Precise Temperature Control: Directly senses medium temperature via the capillary temperature bulb. High control accuracy (±2.5°C), small switching differential (≤4°C), effectively maintains stable process temperature.
Flexible Installation, Wide Applicability: The temperature bulb can be installed via capillary tube extension, allowing the main body to be placed in a safer or more convenient location. Available in land-use and marine-use types, adapting to various environments.
|
Item |
Specification/Parameter |
|---|---|
|
Product Name/Model |
Temperature Controller / BJW51 |
|
Explosion-Proof Marking |
ExnAnCIICT6Gc |
|
Explosion-Proof Type |
Flameproof and Increased Safety Type (nA), Encapsulated Type (nC) |
|
Equipment Protection Level (EPL) |
Gc |
|
Applicable Area & Temperature Class |
Zone 2, T3-T6 |
|
Rated Voltage |
220V / 380V |
|
Rated Current |
15A |
|
Temperature Control Range |
10°C ~ 150°C |
|
Temperature Control Accuracy |
±2.5°C |
|
Switching Differential |
≤4°C |
|
Explosion-Proof Certification |
CNEx16.1255X |
|
Main Structural Components |
Core housing, Terminal box, Base, Temperature control element, Temperature sensing capillary tube, Temperature adjustment knob, Potting material |
Standard Product: The BJW51 model shown in the document is the standard configuration, including the complete controller body, temperature sensing capillary tube, and temperature bulb.
Customization Service: The document does not explicitly list other configuration options. However, based on industry practice, the following customization possibilities can be inquired with the manufacturer:
-
Special Temperature Range: Customize a specific control temperature range different from 10-150°C, within the limits allowed by the mechanical structure.
-
Capillary Tube Length: Customize a specific length of the temperature sensing capillary tube according to installation distance requirements.
-
Special Certification: If certification for specific regions or industries beyond marine standards is required.
FAQ
How does this temperature controller work? Does it need to be connected to a power supply?
This product is a mechanical temperature controller. Its working principle is based on physical thermal expansion and contraction. The liquid medium inside the temperature bulb expands when heated, generating pressure that drives the internal mechanical mechanism, thereby directly controlling the opening and closing of the contacts (T1, T2). It itself does not require an external operating power supply. Its contacts are used to control the power supply of the heat tracing circuit (e.g., heating cable), achieving automatic switching.
The product's temperature control range is 10-150°C. How do I set the desired control temperature?
During installation, what are the requirements for installing the temperature bulb (end of the temperature sensing capillary tube)?
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