I. Core Parameters

Parameter	Specification
Thermocouple Grade	Type S (Platinum-10% Rhodium/Platinum)
Thermocouple Wire Material	Positive pole: Platinum-10% Rhodium alloy; Negative pole: Pure platinum
Thermocouple Wire Diameter	Φ0.35mm, Φ0.4mm, Φ0.45mm, Φ0.5mm
Structural Form	Dual-element type (2 sets of independent temperature-sensing elements integrated in one protection tube)
Temperature Measurement Accuracy	1.0 (600~1100℃); 1 + 0.003(t-1100) (1100~1600℃)
Temperature Range	1300℃ for long-term use; 1600℃ for short-term use
Protection Grade	IP65
Nominal Pressure	Normal pressure
Wiring Interface	M20×1.5, NPT1/2"
Thermal Element	PtRh10-Pt

II. Product Features

High-precision Reference Grade Performance: Inherits the high-precision characteristics of Type S thermocouples, can be used as a standard temperature-sensing element to meet stringent temperature measurement requirements.

Compact Structure & Space-saving: The dual elements share one protection tube, occupying the same installation space as a single-element thermocouple without the need for additional reserved installation positions.

Clear Environmental Adaptability: Suitable for oxidizing and inert atmospheres, and can be used in vacuum environments for short periods; Strictly prohibited for use in reducing atmospheres or scenarios containing metal/non-metal vapors.

III. Related Component Specifications

1. Core Functional Components

Dual-element Temperature-sensing Wires: 2 sets of independent PtRh10-Pt alloy wires with diameters ranging from Φ0.35mm to 0.5mm. Thinner wires deliver faster response, while thicker wires offer enhanced durability.

Protection Tube: 99% alumina ceramic tube (Φ16/25mm), resistant to high temperatures up to 1600℃, and capable of withstanding high-temperature oxidation and mild corrosion inside furnaces.

Junction Box: IP65 protection grade, built-in 2 sets of independent terminals to support separate wiring for 2-channel signals. Waterproof/explosion-proof junction boxes are available as options.

2. Auxiliary Installation Components

Mounting Accessories: Movable flanges, threaded connectors, and fixing brackets, customizable to match the interface dimensions of equipment as required.

Compensation Wires: Special SC-type compensation wires (2 sets of independent circuits), preventing signal interference and ensuring long-distance transmission accuracy.

Matching Instruments: Can be connected to 2 display recorders simultaneously, or to a single dual-channel temperature control device.

IV. Product Advantages

Redundant Backup for Higher Reliability: Dual-channel independent temperature measurement. If one element fails, the other can continue working, avoiding production line shutdowns and reducing operation and maintenance costs.

High Accuracy & Excellent Consistency: The dual elements are made of the same batch of precious metal materials, resulting in minimal temperature signal deviation, ideal for scenarios requiring precise data comparison.

Lower Installation Cost: Compared to installing 2 single-element thermocouples, the dual-element type only requires 1 installation point, saving equipment drilling and installation labor hours.

Strong Durability: The alumina ceramic protection tube resists high-temperature shocks, and the precious metal wires have excellent oxidation resistance. The service life can reach 1–3 years under normal working conditions.

Wide Compatibility: Supports customization of multiple specifications (protection tube length, mounting method, junction box type) to meet the equipment requirements of different industries.

V. Frequently Asked Questions (FAQ)

Q: What is the difference between a dual-element Type S thermocouple and 2 single-element thermocouples?

A: The dual-element type integrates 2 sets of elements in one protection tube, featuring small installation space and low cost. Two single-element thermocouples require 2 independent installation holes, suitable for temperature measurement at different positions. They serve different purposes.

Q: Can the dual-channel signals be connected to the same instrument?

A: Yes, but a dual-channel temperature control/display instrument is required, which supports simultaneous reading of 2-channel temperature data for convenient comparison and monitoring.

Q: How to choose between Φ16mm and Φ25mm protection tubes?

A: The Φ16mm protection tube has fast thermal response, suitable for scenarios requiring rapid temperature measurement. The Φ25mm protection tube has higher mechanical strength and better durability, ideal for working conditions with vibration and impact.

Q: What causes inconsistent signals between the two channels of a dual-element thermocouple?

A: Possible reasons include batch differences in thermocouple wire materials, element position offset during installation, or aging of one channel of wire. Regular calibration is recommended; replace the element if the deviation is excessive.

Q: Can it be used in reducing atmospheres?

A: No. Gases in reducing atmospheres (such as hydrogen and carbon monoxide) will contaminate the platinum-rhodium wire, causing thermoelectric potential drift and eventually losing temperature measurement accuracy.

Q: What is the calibration cycle?

A: For high-precision scenarios (e.g., semiconductors, scientific research), calibration is recommended every 6 months. For general industrial scenarios, annual calibration is sufficient to ensure consistent accuracy of the dual-channel signals.