RTD Thermal Resistance WZPM2-06-85-M18-B: Anti-Fatigue Fracture of Wires on Vibration Equipment

Common industrial equipment like pumps and motors generate constant vibration during operation. As key components for measuring the temperature of these devices, RTDs face a major challenge when installed in these devices: fatigue fracture of the leads due to prolonged vibration. Once the RTD Thermal Resistance leads break, temperature measurement fails, impacting normal equipment operation and potentially causing malfunction. The WZPM2-06-85-M18-B double-branch RTD is designed specifically for the specific characteristics of vibrating equipment like pumps and motors. Its unique internal structure effectively resists fatigue fracture caused by prolonged vibration. Let’s take a closer look at how this RTD’s internal structure works.

1. Reducing Vibration Pull on Leads at the Source

The WZPM2-06-85-M18-B double-branch RTD uses more than simply tying the leads. It utilizes an embedded clamp design that secures the leads to the inner wall of the RTD housing. Vibration generated by pumps and motors is first transmitted to the RTD housing and then to the clamp. The soft gasket acts as a buffer, reducing the force directly transmitted to the wires by vibration. Furthermore, the embedded mounting prevents the wires from wiggling inside the RTD, preventing constant friction and collision with other components due to vibration, and also reduces stretching and bending of the wires. Many conventional RTDs suffer from fatigue fractures over time due to the wires’ insecure mounting. The wires of an RTD are crucial for transmitting temperature signals, and any problems with the wires can negatively impact the entire RTD’s measurement function. The wire mounting design of the WZPM2-06-85-M18-B dual-branch RTD takes into account the operating environment of vibrating equipment, ensuring the wires remain stable during long-term vibration and minimizing fatigue damage.

2. Vibration-Resistant Insulation

In addition to securing the wires, the insulation layer of the WZPM2-06-85-M18-B RTD also provides vibration resistance. It’s made of a flexible, high-temperature-resistant material, unlike conventional insulation layers, which are hard and brittle. When the pump or motor vibrates, the insulation layer deforms slightly, absorbing some of the vibration energy and preventing it from being transmitted directly to the wires inside. Furthermore, this elastic material tightly wraps the wires, preventing any gaps between them and the insulation layer, even during vibration. This prevents the wires from wiggling and rubbing against the insulation layer.

When using a RTD in vibrating equipment, the insulation layer must not only insulate but also protect the wires from vibration. The insulation design of this RTD achieves both, preventing leakage and reducing vibration impact on the wires, further minimizing the risk of wire fatigue fracture.

3. Core Encapsulation to Reduce Wire Stress

The core encapsulation process of the double-end RTD WZPM2-06-85-M18-B is also very sophisticated. The connection between the core and the wires is sealed with a high-strength potting compound. Once cured, the potting compound firmly secures the connection between the core and the wires, forming a single, integrated unit. This prevents relative displacement of the core and wire connection when the RTD is subjected to vibration, reducing stress on the wire at the connection point.

The core and wire connection of conventional RTDs is often loose, making it prone to loosening during vibration. Repeated stress on the wire at the connection point can easily lead to fatigue fracture. The core encapsulation process of this RTD ensures a more secure connection between the core and wire, reducing the risk of wire fracture at the core and ensuring the long-term stability of the RTD in vibrating equipment.

4. Synergistic Vibration Resistance with a Dual-Branch Structure

The WZPM2-06-85-M18-B end-face RTD features a dual-branch structure, meaning it contains two independent measuring elements and wires. This dual-branch structure is also unique in preventing vibration-induced wire fatigue fracture. The two wires are arranged parallel inside the RTD and secured with a dedicated bracket. When the equipment vibrates, both wires simultaneously absorb the vibration force, preventing one wire from being subjected to excessive stress while the other is subjected to insufficient stress.

The dual-branch structure also provides a backup function. Even if one set of wires fails due to extreme vibration, the other set will continue to function, ensuring the RTD does not suddenly lose its temperature measurement function. However, from the perspective of fatigue fracture resistance, the coordinated force distribution of the dual-branch structure is even more important. It ensures more even force distribution between the two sets of wires, reduces fatigue on a single set of wires, and extends the service life of the entire RTD wire.

The dual-branch structure of RTDs offers significant advantages in vibrating equipment. It not only improves measurement reliability but also structurally protects the wires from fatigue damage caused by vibration, making the RTD more suitable for operating environments such as pumps and motors.

5. Detailed Treatment of Connections: Eliminating Weak Points for Wire Fracture

The connection between the wires and the external terminal blocks within the RTD is also a vulnerable point to fatigue fracture due to vibration. The dual-branch end-face RTD WZPM2-06-85-M18-B features special treatment in this area. A sheath is added where the wires meet the terminal blocks, encasing the connection and reducing direct vibration impact. The wires are also bent slightly before entering the sheath, creating a “buffer section.” When vibration is transmitted here, the buffer section absorbs the vibration energy through slight deformation, preventing excessive strain on the wires at the connection point.

Many RTD wire breakages occur at the connection point with the terminal block due to inadequate vibration-resistant treatment of this area. This connection point is subjected to repeated stress during vibration, causing the wires to fatigue easily. The detailed treatment of the connection points on this RTD effectively eliminates this “weak link,” ensuring that the wires are vibration-resistant from both the internal and external connections.

6. Practical Application: Vibration Resistance on Pumps and Motors

When the double-branch RTD WZPM2-06-85-M18-B is installed on a pump, the vibration generated by the pump’s operation is transmitted to the RTD through the mounting base. During this process, the RTD’s embedded wire clamps stabilize the wires, preventing them from swinging back and forth. The elastic insulation layer absorbs some of the vibration energy, reducing impact on the wires. The potting compound encapsulating the core prevents displacement of the core and wire connection points, protecting the wires from stress. The dual-branch structure simultaneously applies stress to the wires, while the sheathing and buffer sections at the connection points protect the connection points. This entire internal structure effectively offsets the effects of pump vibration on the wires, preventing fatigue fractures even during long-term pump operation.

The same applies to motors. The vibration frequency of motors and pumps differs, but the internal structure of this RTD can accommodate vibrations of varying frequencies. The elastic insulation layer’s deformability can be adjusted according to the vibration frequency, and the embedded clamp’s securing force ensures that the wires do not loosen under varying vibration conditions. In actual use, many motors equipped with this RTD have maintained intact wires and stable temperature measurements after long-term operation, without any failures due to wire fatigue fractures.

The performance of the double-branched WZPM2-06-85-M18-B RTD demonstrates that when selecting an RTD for vibrating equipment, one must not only consider measurement accuracy but also its internal vibration-resistant structure. Ordinary RTDs are prone to lead fatigue fracture in vibrating equipment because their internal structure fails to address vibration requirements. Simple wire bundling, brittle insulation, and loose connections between the core and the wire all contribute to continuous wire damage from vibration. RTDs with internal structures designed specifically for vibration environments, such as the WZPM2-06-85-M18-B, can provide long-term, stable operation in equipment like pumps and motors, minimizing the risk of lead fatigue fracture.

If you are experiencing lead fatigue fracture in RTDs for vibrating equipment like pumps and motors, or need an RTD specifically designed for these applications, such as the double-branched WZPM2-06-85-M18-B, please contact us. Our professional technical team can provide one-on-one RTD selection advice and technical support based on your equipment vibration conditions and temperature measurement requirements. This can help prevent equipment downtime and measurement failures caused by RTD wire breakage, ensuring the stable operation of your industrial equipment.

E-mail: sales@yoyik.com
Tel: +86-838-2226655
Whatsapp: +86-13618105229
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