In the field of industrial temperature measurement, platinum resistance thermometers (PTS) are widely used for monitoring the temperature of gases, liquids, and solid surfaces due to their high accuracy and stability. Armored platinum resistance thermometers and threaded probe-type PTSs are two common structural forms, differing significantly in design, installation methods, and applicable scenarios. Correctly distinguishing between these two types of sensors is crucial for selecting the appropriate temperature measurement equipment. This article will systematically explain the differences between the two from four dimensions: structural design, installation method, performance characteristics, and application scenarios, providing a basis for decision-making in industrial applications.
II. Structural Design: Comparison of Integrated Armored and Separate Threaded Types
Structural Characteristics of Armored Platinum Resistance Thermometers
Integrated Drawing Process: Armored platinum resistance thermometers utilize an integral drawing technology, fusing the platinum resistance element, stainless steel protective sleeve (such as 304 or 316L material), and insulating filler (such as magnesium oxide) into a non-removable rigid structure. Its outer diameter is typically 3-8mm, possessing bendability (minimum bending radius up to 5 times the outer diameter), facilitating installation in confined spaces or complex paths. With no internal air gaps, it has a fast thermal response, making it suitable for monitoring rapid temperature changes.
Sealed Design: Internal gaps are filled with inorganic insulating material, achieving an IP68 protection rating and effectively isolating the sensor from moisture, dust, and corrosive media.
Structural Features of the Threaded Mounting Probe Platinum Resistance Temperature Detector:
Modular Design: This sensor consists of a temperature-sensing element (platinum resistance element), a metal protective tube (such as stainless steel or Hastelloy), and a threaded connector. The temperature-sensing element is encapsulated within the protective tube, and the top connects to the device via a threaded connector (such as M6, M8, or G1/2). The threaded design allows users to adjust the installation angle or position as needed, such as flexibly rotating the probe direction at pipe bends.
Modular Flexibility: The modular structure facilitates the replacement of damaged components. For example, in high-temperature or corrosive environments, the protective tube or threaded connector can be replaced individually without replacing the entire sensor.
III. Installation Method: The Convenience of Armoring and the Flexibility of Threaded Connectors
Advantages of Armored Platinum Resistance Temperature Detectors:
Quick Installation: The integrated design simplifies the installation process, allowing direct insertion into pipes or equipment without the need for additional fixing devices. For example, in sterilization equipment in the pharmaceutical industry, armored sensors can be quickly installed inside the reactor, reducing downtime.
Adaptable to complex environments: Their flexibility allows them to bypass obstacles, making them suitable for scenarios with dense piping or limited space.
Installation features of the movable thread mounting probe type platinum resistance thermometer:
Flexible adjustment: The movable thread design allows users to adjust the probe's installation angle or position according to actual needs. For example, the probe direction can be rotated at pipe bends to ensure full contact between the sensing element and the medium.
Easy maintenance: The split design allows the movable thread connector to be separated from the sensing element, facilitating individual inspection or replacement of the thread connector without disassembling the entire sensor.
IV. Performance characteristics: A trade-off between response speed and installation flexibility
Performance advantages of armored platinum resistance thermometers:
Fast response speed: The compact armored structure shortens the thermal response time, making it suitable for scenarios requiring rapid temperature monitoring, such as boiler control in the power industry.
Easy maintenance: The integrated design reduces maintenance points; daily inspections only require attention to appearance and sealing.
Performance Characteristics of Threaded Probe Platinum Resistance Temperature Detectors
High Installation Flexibility: The threaded design allows users to adjust the probe's installation angle or position according to actual needs, such as rotating the probe at pipe bends to ensure measurement accuracy.
Optimized Stability: The split design reduces interference from the external environment on the sensing element, improving long-term stability.
V. Application Scenarios: Adaptation to Harsh Environments and Flexible Installation Needs
Application Scenarios of Armored Platinum Resistance Temperature Detectors:
Harsh Environments: Suitable for environments with humid, dusty, or corrosive media, such as reaction vessels in the chemical industry or sterilization equipment in the pharmaceutical industry.
Space-Constrained Scenarios: In scenarios with dense piping or limited internal space, the flexible nature of the armored sensor simplifies installation.
Application Scenarios of Threaded Probe Platinum Resistance Temperature Detectors:
Flexible Installation Needs: Suitable for scenarios requiring adjustment of the probe's installation angle or position according to actual needs, such as at pipe bends or in complex internal structures of equipment.
High Maintenance Convenience Requirements: The split design offers significant advantages in scenarios requiring frequent inspection or replacement of threaded joints.
