Vibration Sensors

FK SERIES

Eddy-current non-contact displacement transducers for measuring shaft vibration, axial position, rotating speed and phase mark on turbines, compressors and other critical rotating machinery.

Sensor TypeEddy-current, non-contact displacement

Sensitivity7.87 V/mm

Linear Range2 mm

Frequency ResponseDC to 10 kHz (âˆ’3 dB)

Power Supplyâˆ’24 VDC Â±10%

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Product Details

OVERVIEW

FK series are eddy-current transducers used for measuring shaft vibration, axial position, rotating speed and phase mark (phase reference) from small rotating machinery to large critical machinery such as turbines and compressors in plants.

The system consists of a sensor, extension cable and driver unit. The sensor detects shaft displacement without contact using eddy-current principles, providing high-accuracy measurements for continuous condition monitoring.

Multiple sensor sizes are available (FK-202F, FK-452F, FK-302F, FK-602F, FK-143F, FK-263F, FK-152R) to match different installation requirements and measurement applications. All models comply with API standard 670.

FK Series

Eddy-current non-contact displacement transducers for measuring shaft vibration, axial position, rotating speed and phase mark on turbines, compressors and other critical rotating machinery.

Environmental friendly design

Oil leakage reduction options available across the full sensor lineup for environmentally conscious installations.

Flexible mounting options

Multiple driver mounting configurations including DIN rail, screw mount, and multi-pitch options for easy integration into existing systems.

API standard 670 compliant

Fully meets American Petroleum Institute standard 670 requirements for machinery protection systems on critical rotating equipment.

Intrinsically safe

Certified for hazardous areas worldwide: DEKRA (Japan), CSA C/US, ATEX, Ex-CCC (China), KCs (Korea), TS (Taiwan), TR-CU (Russia), IECEx.

CE marking compliant

Meets European CE regulatory requirements for electromagnetic compatibility and safety.

SPECIFICATIONS

MEASUREMENT PERFORMANCE

9 SPECS

01Calibration Material

JIS SCM440 (AISI 4140 equivalent) flat surface

02Measuring Range

0.25 to 2.25 mm from sensor tip

03Sensitivity

7.87 V/mm

04Sensitivity Error

Within Â±4%

05Scale Factor Error (5m system)

Within Â±5% of 7.87 V/mm

06Scale Factor Error (9m system)

Within Â±6.5% of 7.87 V/mm

07Linearity (5m system)

Within Â±25 Î¼m of 7.87 V/mm straight line

08Linearity (9m system)

Within Â±38 Î¼m of 7.87 V/mm straight line

09Frequency Response

DC to 10 kHz (âˆ’3 dB)

ELECTRICAL

6 SPECS

01Power Supply

âˆ’24 VDC Â±10%

02Current Consumption

Max âˆ’15 mA (10 kÎ© load)

03Max Output Voltage

Approx. âˆ’23 VDC

04Output Impedance

50 Î©

05Output Noise

Approx. 15 mV pk-pk + power supply noise

06Sensor Abnormal Output

Approx. âˆ’0.6 VDC (sensor open/short)

ENVIRONMENTAL

5 SPECS

01Sensor Operating Temp

âˆ’40 to +177Â°C

02Extension Cable Temp

âˆ’40 to +177Â°C

03Driver Operating Temp

âˆ’40 to +80Â°C

04Operating Humidity

30 to 95% RH (non-condensing), sensor body: 100% RH

05Marine Application Temp

âˆ’25 to +70Â°C

TEMPERATURE CHARACTERISTICS

4 SPECS

01Sensor

Less than Â±3% of F.S. (0 to 80Â°C)

02Extension Cable

Less than Â±4% of F.S. (0 to 80Â°C)

03Driver

Less than Â±3% of F.S. (0 to 60Â°C)

04Loop (Total)

Less than Â±6% of F.S. (0 to 60Â°C)

PHYSICAL

5 SPECS

01Sensor Tip Diameter

Approx. 5 mm or 8 mm

02Cable Diameter

Approx. 2.7 mm or 3.6 mm

03Connector Diameter

Approx. 7.1 mm

04System Cable Length

5 m or 9 m

05Driver Mass

Approx. 200 g

EXPLOSION PROTECTION (IEC COMPLIANT)

8 SPECS

01DEKRA (Japan)

Ex ia IIC T4 Ga

02CSA C/US

Class I, Division 1, Groups A,B,C,D T4 / Ex ia IIC T4 Ga / AEx ia IIC T4 Ga

03ATEX (Europe)

Ex ia IIC T4 Ga

04Ex-CCC (China)

Ex ia IIC T4 Ga

05KCs (Korea)

Ex ia IIC T4 Ga

06TS (Taiwan)

Ex ia IIC T4 Ga

07TR-CU (Russia)

0 Ex ia IIC T4 Ga X

08IECEx (Oceania)

Ex ia IIC T4 Ga

Use Cases

APPLICATIONS

Engineered for demanding environments across multiple industries and operating conditions.

01Steam turbines

02Gas turbines

03Compressors

04Generators

05Large/medium pumps

06Fans (plain journal bearings)

07Gearboxes

DOCUMENTS

FK Series Product Catalog

catalog

Coming soon

FK-202F Specifications (IEC compliant)

datasheet

Coming soon

FK-202F Specifications (Oil leakage reduction)

datasheet

Coming soon

FK-452F Specifications (IEC compliant)

datasheet

Coming soon

FK-452F Specifications (Oil leakage reduction)

datasheet

Coming soon

FK-302F Specifications (IEC compliant)

datasheet

Coming soon

FK-302F3 Specifications (15m System, IEC)

datasheet

Coming soon

FK-302F Specifications (Oil leakage reduction)

datasheet

Coming soon

FK-602F Specifications (IEC compliant)

datasheet

Coming soon

FK-602F Specifications (Oil leakage reduction)

datasheet

Coming soon

FK-143F Specifications (IEC compliant)

datasheet

Coming soon

FK-143F Specifications (Oil leakage reduction)

datasheet

Coming soon

FK-263F Specifications (IEC compliant)

datasheet

Coming soon

FK-263F Specifications (Oil leakage reduction)

datasheet

Coming soon

FK-152R Long Cable Specifications (IEC compliant)

datasheet

Coming soon

REQUEST A QUOTE

Contact Athena Control for pricing, availability, and technical support for the FK Series.