Pendulum Probe DP 243

 

DP 243 is a pendulum-type displacement measurement probe that utilizes the non-contact eddy current measurement principle. It is designed based on the TQ402 sensing technology and is used for low-frequency vibration, structural displacement, and condition monitoring of large rotating machinery. This product detects the relative displacement between the pendulum mechanism and the target, converting mechanical motion into continuous measurement signals. It is combined with the IQS 450 Signal Conditioner to form a complete measurement chain, suitable for online monitoring systems of equipment such as steam turbines, hydro turbines, gas turbines, generators, and compressors. It supports a maximum working temperature of +200°C and can be configured with different measurement ranges, cable lengths, and transmission methods according to on-site requirements, meeting various industrial application scenarios.

For equipment maintenance and procurement personnel, DP 243 focuses more on system compatibility, long-term operational capability, and installation flexibility. The product supports two signal transmission methods: 2-wire (up to 1000 m) and 3-wire (up to 200 m), and can be integrated with the VM600 system and other mechanical protection and condition monitoring platforms. We can provide original model supply, model selection support, complete order code confirmation, global logistics distribution, and after-sales technical services. We also assist customers in confirming the matching IQS 450, EA402 extension cables and related accessories, helping to shorten the procurement cycle and reduce project risks caused by incorrect model matching.

 

DP 243 adopts a measurement method combining a pendulum mechanism with electro-vortex displacement measurement technology. By detecting the position changes of the pendulum relative to the target, it enables continuous monitoring of the low-frequency displacement and structural vibration of the equipment. The entire measurement process does not require mechanical contact, which can reduce wear between the measurement components and the object being measured, while maintaining a stable signal output.

A TQ402 eddy current displacement sensor is installed inside the probe. This sensor is fixed at the top of the pendulum and continuously monitors the relative distance between it and the target. When the equipment tilts, swings, or undergoes low-frequency vibration, the pendulum remains relatively stable due to gravity, while the mounting base moves along with the equipment, resulting in displacement changes between the two. The TQ402 converts these displacement changes into electrical signals and transmits them to the IQS450 signal conditioner for high-frequency excitation, demodulation, and signal processing. The processed signals can be output to the mechanical protection system, status monitoring system, PLC, or DCS to achieve real-time monitoring of the equipment's operating status.

Depending on the distance between the on-site control room and the equipment, different signal transmission methods can be adopted. When the measurement points are far apart, a two-wire current modulation method can be used, with the longest transmission distance reaching up to 1000 meters. This method can also be converted into a voltage signal through the GSI124 isolator for use by the monitoring system. For installation environments with shorter distances, a three-wire voltage modulation method can be employed, directly connected to most mechanical monitoring systems, without the need for additional conversion equipment.

Because DP243 supports various measurement ranges, system lengths, and probe configurations, it can be customized according to the actual working conditions and is widely applied in basic vibration monitoring, structural displacement monitoring, and equipment condition analysis of large rotating machinery such as steam turbines, hydro turbines, gas turbines, compressors, generators, etc., providing continuous monitoring data for the mechanical protection system.

Before installing the DP 243 Pendulum Probe, it is necessary to confirm the probe model, signal output method, wiring form, and compatibility with the existing vibration monitoring system. Depending on the configuration, the DP 243 can adopt different signal transmission methods, including 2-wire current modulation output and 3-wire voltage modulation output. During installation, the correct connection method must be selected according to the input requirements of the on-site monitoring system.
Correct mechanical installation, electrical connection, and system configuration are crucial steps for ensuring the accuracy of vibration measurement data.

Step 1: Clean the installation surface
Step 2: Secure the Pendulum Probe DP 243. According to the equipment installation requirements, fix the DP 243 to the designated measurement position.
Step 3: Cable Arrangement. After the probe installation is completed, it is necessary to properly arrange the connecting cables.
Step 4: Electrical connection. The Pendulum Probe DP 243 can adopt different output methods depending on the different model configurations.
Step 5: After completing the mechanical installation and electrical connections, system debugging is required.