Dual Contact Temperature Switch

Overview of Dual Contact Temperature Switch

The Dual Contact Temperature Switch is a mechanical sensing instrument designed for the simultaneous monitoring and dual-stage control of temperatures in flowing neutral gases and liquids. Utilizing a capillary and bulb-style sensor, the device operates on the principle of liquid expansion. As the temperature at the bulb increases, the internal fluid expands through the capillary to actuate two independent micro-switches. This "dual contact" design allows for complex control logic, such as an early warning alarm followed by a system shutdown, or the sequential control of multiple heating elements.

Features of Dual Contact Temperature Switch

• Wide Adjustable Range: Offers a broad temperature control spectrum from -30°C to 280°C, suitable for both refrigeration and high-heat industrial processes.

• High Synchronization Precision: Features a synchronization error of ≤0.5%, ensuring high consistency between the lower switching values of the two contacts.

• Remote Sensing Capability: Equipped with a 1.5-meter capillary, allowing the controller to be mounted on a central panel while the sensing bulb is placed directly within the process medium.

• Robust Media Compatibility: Designed for neutral gases and liquids. For corrosive environments, a stainless steel thermowell can be added to protect the standard copper bulb.

• Vibration Resistance: Built to withstand mechanical stress with vibration resistance up to 20 m/s², ensuring stable setpoints in proximity to industrial machinery.

• Flexible Installation: Can be mounted in any orientation without affecting measurement accuracy, providing versatility for various pipeline and tank layouts.

• High Load Switching: Integrated micro-switches support AC 220V 6A (resistive), capable of directly managing heavy-duty industrial relays and contactors.

Applications of Dual Contact Temperature Switch

• Industrial Boilers & Heaters: Providing two-stage temperature control to prevent overheating and maintain energy efficiency.

• Lubrication Systems: Monitoring oil temperatures in large gearboxes and turbines, with one contact for a cooling fan and the second for an emergency alarm.

• HVAC & Large Cooling Towers: Controlling fan speeds or compressor cycles based on ambient or process fluid temperatures.

• Chemical Processing: Regulating temperatures in non-corrosive fluid tanks and gas flow lines.

• Power Plants: Ensuring critical fluid temperatures in auxiliary systems remain within safe operational limits.

Price of Dual Contact Temperature Switch

The price for the Dual Contact Temperature Switch is influenced by the specific temperature range required and the choice of additional protective accessories, such as stainless steel thermowells for the sensing bulb. Standard configurations with a 1.5m capillary offer a cost-effective solution for dual-stage control. For a formal quotation tailored to your specific temperature setpoints and media conditions, please contact the ZINACA Instruments sales department.

OEM Service

ZINACA Instruments provides specialized OEM services for dual contact temperature controllers:

Custom Capillary Lengths: Manufacturing capillaries longer than the standard 1.5m to accommodate large-scale industrial installations.

Specialized Protection: Providing custom-fit stainless steel or specialized alloy sleeves for bulbs used in aggressive chemical media.

Private Labeling: Permanent laser marking of your brand logo, model numbers, and specific electrical ratings on the housing.

Setpoint Pre-configuration: Factory setting of specific upper and lower switching limits based on your application’s logic requirements.

Technical Specifications