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Athena Control
Vibration Sensors

WK/WKN SERIES

SHINKAWA Electric

2-wire vibration/thrust transmitter with eddy-current sensor technology. Achieves low-cost vibration monitoring via a two-wire current loop system.

Sensor TypeEddy current, non-contact
Output Signal4 to 20 mA (2-wire)
Frequency Response5 Hz to 6,000 Hz
Power Supply12 to 35 VDC
Explosion ProtectionCSA, ATEX, KTL, TR-CU
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WK/WKN Series

Product Details

OVERVIEW

The WK/WKN series adds a vibration conversion function or thrust conversion function to an eddy current transducer.

Driving by a 2-wire current loop can directly transmit 4 to 20 mA signals so that the cost of the vibration monitoring system is saved.

The WK series uses a separate transmitter box, while the WKN series integrates the transmitter into a compact transducer unit — both sharing the same eddy-current sensor and extension cable components.

WK/WKN Series

2-wire vibration/thrust transmitter with eddy-current sensor technology. Achieves low-cost vibration monitoring via a two-wire current loop system.

No need for vibration monitor or vibration converter

Direct 4 to 20 mA output eliminates the need for separate vibration monitors or signal converters.

Long-distance wiring capable

Current output signal allows long-distance cable runs without signal degradation.

Direct connection to control devices

4-20 mA current loop connects directly to PLC, DCS, and other control systems.

Ideal for small rotating machines

Designed for vibration monitoring of general-purpose compressors, pumps, and motors.

Explosion-proof system

Non-incendive construction available: CSA C/US Class I Division 2, ATEX Ex nA II T4 Gc, KTL, TR-CU.

SPECIFICATIONS

CURRENT OUTPUT (4-20 MA)

4 SPECS
Output Range
0–100, 0–125, 0–200, 0–250, 0–400 μm pk-pk (selectable)
Conversion Accuracy
±1.5% of Full Scale Range
Max Load Resistance
43.5 × (Vps − 12) Ω
Not-OK Function
Output drops to ≤3.6 mA on sensor open/short or out-of-range

GAP OUTPUT (WAVEFORM)

5 SPECS
Calibration Material
JIS SCM440 (AISI 4140 equivalent) flat target
Linear Range
1.4 mm (Gap: 0.3 to 1.7 mm)
Scale Factor
7.87 mV/μm
Scale Factor Error
7.87 mV/μm ±6.5% typ.
Output Impedance
10 kΩ (calibrated at 10 MΩ load)

SYSTEM

3 SPECS
Frequency Response
5 Hz to 6,000 Hz (+0 dB, −3 dB) at 900 μm gap
Power Supply Voltage
12 to 35 VDC
System Cable Length
5 m or 7 m

ENVIRONMENTAL

5 SPECS
Transmitter Operating Temp
0 to 70°C (32 to 158°F)
Transmitter Storage Temp
−34 to +100°C (−29 to +212°F)
Sensor Operating Temp
−34 to +177°C (−29 to +350°F)
Connector Max Temp
125°C (257°F)
Relative Humidity
30 to 95% RH (non-condensing)

PHYSICAL

6 SPECS
Sensor Tip Diameter
Approx. 5.5 mm (0.217 in)
Cable Diameter
Approx. 2.7 mm (0.106 in)
Connector Diameter
Approx. 7.1 mm (0.280 in)
WK Transmitter Size
100 × 74 × 50 mm, approx. 530 g
WKN Transmitter Size (Type 1)
90 × 40 × 46.2 mm, approx. 200 g
WKN Transmitter Size (Type 2)
90 × 74 × 45.2 mm, approx. 200 g

EXPLOSION PROTECTION

4 SPECS
CSA C/US
Class I, Division 2, Groups A, B, C and D
ATEX
Ex nA II T4 Gc
KTL
Ex nA II T4
TR-CU
2Ex nA II T4 Gc X

Use Cases

APPLICATIONS

Engineered for demanding environments across multiple industries and operating conditions.

01Pumps
02Motors
03General-purpose compressors
04Small rotating machinery
05Water & wastewater plants
06Industrial machinery

DOCUMENTS

WK Series Product Catalog

catalog

Coming soon

WKN Series Product Catalog

catalog

Coming soon

WK-142K Specifications

datasheet

Coming soon

WK-142K5 Specifications (9m System)

datasheet

Coming soon

WK-142T Specifications (Thrust)

datasheet

Coming soon

WKN-142K Specifications

datasheet

Coming soon

WKN-142K5 Specifications (9m System)

datasheet

Coming soon

WKN-142T Specifications (Thrust)

datasheet

Coming soon

WKN-142T5 Specifications (9m System)

datasheet

Coming soon

REQUEST A QUOTE

Contact Athena Control for pricing, availability, and technical support for the WK/WKN Series.

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