KM203EX

Product Description

The KM203EX is a high-performance vibration transmitter with a high-protection stainless steel housing and terminal block output, designed for measuring 

periodic vibration in various rotating machinery, typically mounted on bearing housings to detect bearing wear and absolute vibration.

The sensor features an integrated construction with shear-mode piezoelectric elements, amplification and integration circuits encapsulated in an internal 

metal housing, which provides electrical and thermal isolation from the external stainless steel housing. This dual-housing design prevents ground loop 

formation to eliminate electrical interference and minimizes the effects of temperature shock and base stress. It employs two-wire loop-powered operation, 

providing a 4–20mA standard signal proportional to vibration amplitude that can be directly connected to PLC, DCS or SCADA systems, providing reliable 

data for equipment predictive maintenance.

The transmitter features a fully sealed structure with IP66 ingress protection, excellent EMI immunity, supports long-distance signal transmission, and offers 

corrosion and salt spray resistance for strong environmental adaptability, making it suitable for harsh industrial environments such as chemical plants, 

offshore platforms and high-salt spray areas.

Key Specifications

Electrical Specifications

• Power Supply:10-30 VDC, Loop Powered

• Frequency Response

     10-1000 Hz (±5%)

      3-2000 Hz (±3 dB)

• Repeatability: ±2%

• Max Transverse Sensitivity: 5%

• Turn on time: 25 s

• Vibration Limit: 200 g

• Shock Limit: 3000 g

• Loop Impedance: 700 Ω @ 24 VDC

• Resonant Frequency: 12 kHz

  
  

Physical Specifications                                                                                                                                                                   

• Sensing Element: Shear-mode PZT Ceramic

• Housing Material: 316L Stainless Steel

• Output connection: Terminal Block

• Ingress Protection: IP66

• Weight: 545 g

  
  

Environmental Specifications:

• Operating Temperature: -40 °C to +110 °C

• Operating Humidity: 5% to 95% RH, non-condensing

  
  

Hazardous Area Approvals:

•  ATEX: 

             II 1G Ex ia IIC T4 Ga

             II 2G Ex db IIC T4 Gb

             II 2D Ex ib IIIC T130 °C Db

              （-40 °C to +80 °C）

• CNEx:       

     Ex ia IIC T6 Ga,Ex ib ⅢC T80℃ Db 

     Ex db IIC Gb, Ex tb IIIC Db

• CSA/NRTL/C:

              Ex ia IIC T4

              AEx ia IIC T4

              Class I Division 1, Groups A,B,C,D

              Class II Division 1, Groups E,F,G

              Class III Division 1

              T4 @ Ta ≤ 80 °C