1. Althen Sensors
  2. Sensors
  3. Strain sensors & strain gauges
  4. Strain gauges for embedding in concrete or mortar
  5. KM strain transducer

KM strain transducer

lnternal strain of concrete, synthetic resin


Key features

  • Self-temperature compensated transducer having a linear thermal expansion coefficient similar to concrete
  • Low elastic modulus enables inner strain measurement during the very early stages of curing
  • Simultaneous measurement of strain and temperature except for KM-30 ,KM-50F
  • Surface strain measurement is also available onto retaining wall, strut, sheet pile, etc.
  • KM-30/KM-100B/-100HB/-100BT Only CE Marking Compliant

About the KM strain transducer

The KM series strain transducers are designed to measure strain in materials such as concrete, synthetic resin which undergo a transition from a compliant state to a hardened state. Their extremely low modulus (KM-M:25N/mm2) ,(others:40N/mm2) and waterproof construction are ideally suited for internal strain measurement during the very early stages of curing. They are totally impervious to moisture absorption, producing excellent stability for long-term strain measurement. Relative temperature measurement is also possible with the KM-B. The built-in thermocouple sensor of the KM-BT enable actual temperature measurement in addition to strain measurement. Adding to the above embedment use, surface strain measurement onto concrete, H-beam steel is also available with various optional fittings.The new KM-M type small-diameter strain transducer has a smaller diameter than the conventional product and is suitable for measuring concrete with a thin cover thickness and surface strain. The KM series is compliant to CE marking except for KM-50F and KM-M.

Protection ratings: IP67 equivalent for KM-30
IP68 equivalent for KM-100B to KM-100BT / KM-M

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Technical Specifications

Specification Value
Capacity ±5000 x 10-6 strain
Rated output (Approx.) KM-30 2.5mV/V(5000 x 10-6 strain)
Rated output (Approx.) KM-50 4.0mV/V(8000 x 10-6 strain)
Rated output (Approx.) KM-100B | 100-HB | 100-BT 2.5mV/V(5000 x 10-6 strain)
Rated output (Approx.) KM-100M | 100-HM | 100-MT 2.5mV/V(5000 x 10-6 strain)
Non-linearityKM-30 | KM-50 | KM-100B | 100-HB | 100-BT 1%RO
Rated output (Approx.) KM-100M | 100-HM | 100-MT 2%RO
Temperature range KM-30 -20 to +60℃
Temperature range KM-50 | KM-100B | KM-100BT | KM-100M | KM-100MT -20 to +80℃
Temperature range KM-100HB | KM-100HM -20 to +180℃