3018 Series

Product Description

The 3018 series eddy current sensors utilize the eddy current principle to deliver non-contact monitoring of shaft vibration, axial displacement and speed in 

rotating machinery. The proximity driver supplies a high-frequency excitation signal to the probe, creating a high-frequency alternating electromagnetic field 

at the probe tip. Eddy currents and opposing magnetic fields are induced on the target metal shaft surface, and changes in shaft gap cause variations in the 

probe coil equivalent impedance. The proximity driver converts this impedance change into a standard voltage signal, where the dynamic component reflects 

shaft vibration conditions and the static component corresponds to average gap, delivering high-precision non-contact monitoring for continuous online 

monitoring of critical rotating equipment.

The system consists of probe, extension cable and proximity driver, capable of simultaneous dynamic and static measurements. It is primarily used for 

monitoring radial shaft vibration, axial displacement, keyphaser and speed in rotating machinery. The system continuously monitors rotor operating conditions, 

identifies fault characteristics such as imbalance, eccentricity, bearing wear and shaft cracks, and provides critical data for early fault diagnosis.

Key Specifications

Electrical Specifications

• Supply Voltage: -18 VDC to -30 VDC

• Probe Tip Diameter: 8 mm

• Sensitivity: 7.87 mV/μm (200 mV/mil)

• Linear Range: 0.35 mm to 2.35 mm

• Frequency Response: 0 to 10 kHz (±3 dB)

• Environmental Specification

Operating Temperature：                                                                                                                                                                   

• Probe: -50 °C to +160 °C

• Extension Cable: -50 °C to +160 °C

• Proximity Driver: -40 °C to +85 °C    

Storage Temperature：

• Probe: -50 °C to +160 °C

• Extension Cable: -50 °C to +160 °C                                                                                                                                                               

• Proximity Driver: -50 °C to +100 °C

Operating Humidity：

• Probe & Cable: 100% RH condensing; not submersible (connectors must be sealed)

• Proximity Driver: 5% to 95% RH, non-condensing

Hazardous Area Approvals:

•  ATEX: 

             II 1G, Ex ia IIC T4 Ga

             II 2D, Ex ib IIIC T105 °C Db

                 （-40 °C to +85 °C）

• CNEx:       

        Ex ia IIC T6 Ga

        Ex ib IIIC T80 °C Db

• CSA/NRTL/C:

               Ex ia IIC T4/T5

              Class I Zone 0 / Class I Division 1

              Groups A, B, C