Description

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CON021  is an eddy current preamplifier model from Emerson’s EPRO series, specifically designed for shaft vibration and displacement monitoring of industrial rotating machinery (such as steam turbines, fans, pumps, and compressors). It is often used in conjunction with eddy current probes such as PR6423 and PR6424 to form a complete TSI (Turbine Monitoring System) sensor module. This model is still in production and is still distributed through distributors. It possesses core advantages such as high precision, non-contact operation, and wide frequency response (0–20,000 Hz), and is widely used in heavy industries such as power, petrochemicals, and metallurgy.

Typical Application Scenarios

Large Steam Turbine Shaft Vibration Monitoring: Used to detect rotor radial/axial displacement, eccentricity, and vibration amplitude.

Fan and Compressor Bearing Condition Assessment: Enables predictive maintenance and provides early warnings of bearing wear or misalignment.

Pump and Gearbox Operation Monitoring: Stable signal output under high temperature, high humidity, and strong electromagnetic interference environments.

TSI System Core Components: Integrated into Emerson MMS3000, 3500, and other industrial monitoring platforms, supporting digital communication and remote diagnostics.

Model Evolution and Alternative Solutions

The CON021  series is still undergoing iteration, with multiple derivative models. These are not direct replacements but are functionally compatible.

Table

Model Description and Applicable Scenarios

CON021  /916-XXX Extended Range Version: Adapted to high-range probes in large displacement or high vibration environments.

PR6423/103-141 + CON021  New Generation Combination: Supports 3500/40 module communication digital TSI. System Upgrade

CON021  /91X-XXX Extended Range Version Designed for High-Sensitivity Applications with the PR6425 Probe

Technical Specifications Summary

Table

Parameter Values

Sensor Type: Eddy Current Non-Contact Displacement/Vibration Sensor Preamplifier

Compatible Probe Models: PR6422 / PR6423 / PR6424 / PR6425 / PR6426

Frequency Response Range: 0 to 20,000 Hz (-3 dB)

Rise Time: <15 μs

Output Voltage Range: -4 V to -20 V (Supply: -23 V to -32 V)

Or -2 V to -18 V (Supply: -21 V to -32 V)

Operating Temperature Range: -30°C to 100°C (-22°F to 212°F

Protection Rating: IP20

Installation Method: Separate connection with the probe, connected to the preamplifier via a dedicated cable.

Measurement Principle: Eddy current effect; eddy currents are induced on the metal surface by the probe coil, detecting relative displacement changes.

System Working Principle Summary:

The CON021  preamplifier receives high-frequency oscillation signals from the PR6423 probe. Through an internal bridge circuit and temperature compensation coil, it converts the eddy current changes into an analog output of DC voltage superimposed with an AC vibration signal, for subsequent acquisition system analysis. Its core is the eddy current effect: the probe coil generates an alternating magnetic field → eddy currents are induced on the surface of the metal object being measured → the eddy current counter-magnetic field affects the original coil impedance → impedance change is converted into a voltage signal.

Installation and Wiring Key Points:

Probe Installation: Must be perpendicular to the surface of the measured axis, at a distance of 0.5–2.0 mm (depending on the measurement range), fixed using a dedicated bracket to avoid mechanical vibration interference.

Cable Connection: The probe and preamplifier use a plug-in connection. Shielded twisted-pair cable is recommended, with a length not exceeding 100 meters.

Power Requirements: A negative voltage power supply (-24V DC) is required. Positive voltage input is strictly prohibited, as it will damage the circuit.

Grounding: The preamplifier casing must be reliably grounded to suppress electromagnetic interference.

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Recommended related products:
PR6423/010-040 CON021
EPRO PR6423/10R-030+CON021 Eddy current sensor
EPRO Eddy current sensor PR6423/013-030+CON021
EPRO PR6423/010-010+CON021 Eddy current sensor
EPRO PR6423/00R-010 CON021
EPRO CON021 PR6423/010-010
EPRO PR6423/10R-030+CON021
EPRO PR6423/016-030+CON021
EPRO CON021/916-200+PR6426/010-140
More……