Crack Displacement Transducers

KG-A Crack Displacement Transducer
±2 mm/±5 mm CE

This displacement transducer is set across a crack on the surface of concrete or across a joint between two concrete blocks to measure the displacement of surface gaps. Its waterproof structure allows this transducer to make stable measurement outdoors over a long period of time. Mounts using an achor bolt (KGF-11) or mounting brackets (KGF-31).
Temperature-integrated model with built-in thermocouple also available.

Protection ratings : IP 65 equivalent

KG-A Crack Displacement Transducer
  • Drip-proof structure
  • Excellent stability over a long period of time
  • High sensitivity, High accuracy
  • Compact, Easy to handle
  • Specifications

    Type Capacity Rated output Non-linearity Temperature range
    KG-2A ±2 mm Approx. 1.5 mV/V (3000 x 10-6 strain) 0.5 %RO -20 to +60 ℃
    KG-5A ±5 mm Approx. 2 mV/V (4000 x 10-6 strain) 1 %RO

    Output polarity


    Measurement moves in the plus direction with regard to an increase of the opening.

KG-B Crack Displacement Transducer X:-2 to +4 mm Y:±3 mm

The KG-B crack displacement transducer is used to measure the displacement in two directions simultaneously: the displacement of openings, such as concrete cracks or joints, and the horizontal shear displacement. It is mounted on a structure by bonding with adhesive. Because the fixing jigs are detachable, the transducer can be demounted and set on a different structure. This allows this transducer to be used repeatedly on different structures. In addition, the small-size feature makes this transducer suitable for indoor measurement.

KG-B Crack Displacement Transducer
  • Compact, Light-weight
  • Easy to handle
  • Repeated use
  • Specifications

    Type KG-3B
    Capacity X-direction -2 to +4 mm
    Y-direction ±3 mm
    Rated output X-direction Approx. -1 to +2 mV/V (+4000 x 10-6 strain, -2000 x 10-6 strain)
    Y-direction Approx. 1.5 mV/V (3000 x 10-6 strain)
    Non-linearity 1 %RO
    Temperature range 0 to +40 ℃