Thermocouple Connection Heads Suppliers

Jiangsu Zhaolong Electrics Co., Ltd. is a Thermocouple heads manufacturer and temperature-sensor production base in China. We design and produce thermocouple connection heads that protect the sensitive junction, secure the terminal block, and provide a dependable interface between the field sensor and the control loop. Our cooperation with Shanghai R&D institutions and academies has shaped a product range used in chemical, petrochemical, power, metallurgy, building-material and daily-chemical plants around the world.

The heads we ship are specified together with the thermocouple or RTD assembly, not as a standalone item. That is why our available range includes standard connection heads, corrosion-resistant housings, explosion-protected versions and the movable ferrule union used to adjust insertion depth inside a thermowell or protection tube.

Thermocouple Head Range and Configuration

Our thermocouple heads are configured around the mounting, environmental and electrical requirements of each installation:

• General-purpose connection heads for thermocouple and RTD termination in dry indoor and sheltered outdoor positions. They keep dust, condensation and accidental contact away from the terminal block.
• Weather-protected heads for outdoor plants and humid process areas, with gasketed covers and cable-entry options that match the specified gland.
• Explosion-protected heads for hazardous-area assemblies. We hold national explosion-proof production qualification for explosion-proof thermocouples and RTDs, covering the complete head-and-sensor assembly.
• Movable ferrule union to connect the head to the thermowell or protection tube and permit axial adjustment of the measuring point while maintaining a stable mechanical joint.

Application Fit by Industry

In chemical plants, reactor jackets, storage tanks and pipelines are monitored continuously, so the head must keep the connection stable under process vapors, heat tracing and caustic washdown. In petroleum and petrochemical facilities, the complete assembly is expected to remain mechanically dependable for long turnaround intervals.

• Chemical processing: reaction vessels, storage tanks, pipelines and dosing systems.
• Oil, gas and petrochemical: refining units, compressors, pipeline stations and storage facilities.
• Power and cement plants: high-temperature sensor assemblies, often paired with ceramic or refractory protection tubes.
• Daily chemical production: reactors, mixers and temperature-sensitive process equipment where maintenance access is frequent.

Engineering, Customization and System Integration

We manufacture heads for both normal and special specifications. If your project requires a different thread, terminal layout, cable entry position or housing material, we can develop the head from a drawing or sample. Customized production is our core business.

Head selection is coordinated with the complete loop. We also design and install automatic temperature control boxes, control rooms and remote monitoring temperature control systems, so the head, wiring, assembled thermocouple, transmitter and controller are treated as one system rather than separate purchases.

Materials, Terminals and Mechanical Interfaces

• Housing material and finish selected for the process atmosphere, ambient corrosion and mechanical impact.
• Internal terminal blocks designed for consistent electrical contact and reduced signal drift.
• Cable entry threads and glands specified for armored, braided or flexible cable.
• Mounting thread and ferrule arrangement matched to the thermowell or thermocouple sleeves.
• Ingress protection level matched to the installation location.

Quality Control and Testing

Every product is manufactured with quality supervision throughout the process. Our testing equipment includes low-temperature test tanks, noble-metal high-temperature test furnaces, Pt-Rh high-temperature test furnaces, oil tank test furnaces and base-metal test furnaces. Factory testing confirms accuracy and stability within the operating temperature range, and calibration is supported with reference equipment covering -200 °C to +2000 °C.

We operate under GB/T 19001-2016/ISO 9001:2015, hold CE certification, multiple invention and utility-model patents, ISO 14001 environmental management system certification, and national explosion-proof production qualification for thermocouples and RTDs.

Maintenance, Spare Parts and Service

Thermocouple heads are routine service points. Caps, terminal blocks, glands, ferrules and gaskets can be replaced without disturbing the thermowell, which shortens turnaround time. We maintain spare parts supply for sensors and accessories, offer professional calibration services, and provide a warranty period of up to 12 months for non-human damage.

Information We Use to Configure Your Solution

To prepare a head configuration and quotation, we start with the following project input:

• Sensor specification: thermocouple type and calibration, RTD curve, number of elements.
• Mechanical mounting: head thread, thermowell or protection tube size, ferrule requirement.
• Site conditions: ambient temperature, humidity, chemical atmosphere, hazardous area classification.
• Cable entry and gland: thread standard, cable outer diameter, armored or unarmored cable.
• Electrical arrangement: terminal count, grounding requirement, transmitter inside the head.
• Acceptance requirements: calibration certificate, inspection level, material traceability.

Frequently Asked Questions

What is the difference between a thermocouple head and a thermocouple connector?
A head is an enclosure that protects the junction, terminal block and wiring connection of a temperature sensor assembly. A connector is a smaller plug-and-socket arrangement for quick disconnection. We supply both; for thermocouple connectors, the same alloy-compensation and polarity logic applies.

Can you supply a thermocouple head for an explosion-proof sensor assembly?
Yes. We hold national explosion-proof production qualification for explosion-proof thermocouples and RTDs. Send the hazardous area classification, gas group and enclosure thread so we can match the head, gland and sensor as a complete assembly.

Do you make non-standard thermocouple heads?
Yes. Standard and special specifications are our normal scope. We can produce according to a drawing or sample; terminal count, cable entry direction, thread sizes and housing material can be adjusted for the site requirement.

What information do you need for a quotation?
Provide the sensor type and calibration, mounting thread to the thermowell or protection tube, working temperature, ambient conditions, hazardous area requirement, cable type and quantity. Include a drawing if a special head is required.

Why use a movable ferrule union?
It allows the temperature sensor to be positioned at different insertion depths in the same thermowell or protection tube while holding the head firmly. This is useful when process conditions or tank level changes shift the optimum measuring point.