Description
PR6424/006-030+CON021 Product Introduction
This is an Emerson EPRO brand eddy current shaft displacement sensor system, consisting of a sensor probe (PR6424/006-030) and a preamplifier (CON021), widely used in turbine TSI (turbine supervisory instrument) safety monitoring systems.
1、 Core positioning
PR6424/006-030: Eddy current sensor probe, used for measuring axial displacement and differential expansion.
CON021: Standard preamplifier (signal conversion module), protection level IP20.
Attention: PR6424 series is used for measuring shaft displacement/differential expansion; The PR6423 series is only used for shaft vibration measurement, and the two should not be confused.
PR6424/006-030+CON021 Emerson Displacement Sensor System
2、 Working principle
Based on eddy current testing technology. The probe and preamplifier form a high-frequency oscillator. When the probe is close to the metal surface being measured (such as a turbine rotor), the change in air gap causes the oscillation amplitude to attenuate, thereby converting mechanical displacement into electrical signal output. The amplitude attenuation is directly proportional to the gap distance.
Linear calibration has been completed using 42CrMo4 calibration material at the factory, and on-site installation does not require repeated calibration. Simply adjust the air gap to the desired signal.
3、 Key technical parameters
Measurement range: approximately 0 to several millimeters (PR6424 series covers 1 to 20 millimeters)
Applicable temperature: -35 ℃ to+380 ℃
Working voltage: 220V AC
Output frequency: 50kHz
Output signal: AC voltage proportional to displacement superimposed on DC voltage
Linear error: less than or equal to plus or minus 0.5% of full scale
Response time: approximately 15 milliseconds
Protection level: The preamplifier CON021 is IP20
Origin: Germany
4、 Installation configuration options
Thread specifications: M10 × 1 (metric) or 3/8 “-24UNF (imperial) optional
Cable: armored or unarmored, optional with intermediate joint at 1 meter
Connection method: LEMO plug (CON021 standard configuration)
The preamplifier also has an explosion-proof version CON011 (IP67) to choose from, and CON021 is a standard non explosion-proof type
5、 Typical applications
Axial displacement monitoring of steam turbine rotor
Monitoring of turbine expansion difference (relative expansion difference between rotor and cylinder)
Compatible with MMS6000/A6000 series monitoring systems
State monitoring and protection of rotating machinery in thermal power plants, chemical industries, etc
6、 Maintenance points
Daily inspection: monthly check for cable damage, loose joints, and probe dust accumulation
Cleaning: Wipe with a dry soft cloth, do not use corrosive cleaning agents
Replacement: Power off operation, record the original wiring, zero point calibration and signal testing are required after installation
Storage: Dry and ventilated environment, -20 ℃ to 60 ℃, avoid direct sunlight
Summary in one sentence: This is a set of eddy current shaft displacement/differential expansion monitoring sensors originating from EPRO in Germany, specially designed for the safe operation of rotating machinery such as steam turbines. It has high accuracy, high temperature resistance, and relatively easy installation. If used in explosion-proof areas, the preamplifier needs to be replaced with the CON011 model.
