SI-H Force Transducers

Please Contact WPI for Pricing

Order code

  • For use with the SI-BAM21-LC or SI-BAM21-LCB ONLY
  • For use with the SI-H line of muscle testers
  • Nearly insensitive to temperature and light
  • Extremely linear
  • Virtually indestructible with normal use
  • See Details for part numbers
  • Contact WPI for specific optical transducer force ranges.

Click here to view the current Data Sheet


Different transducer bodies can be exchanged and set and zeroed to the same bridge amplifier at the touch of a button. After a simple calibration with an appropriate weight, the system is ready to use.



Order code Size
SI-KG2 0-2N, 0-200g
SI-KG4 0-50mN, 0-5g
SI-KG4A 0-20mN, 0-2g


Mounting Devices

A variety of convenient fiber mounting devices are available in two lengths and two shaft diameters.


  • The 32mm length is ideal for standard, isometric forces.
  • Choose the 22mm length when using a motor.

Shaft diameter :

  • Use the 0.8mm for the KG4 and KG7B force transducers.
  • Use the 0.5mm for the KG4A and KG7.

The KG2 have unique mounting devices.

  Range Range (g)
Noise (μN) Compliance (µm/mN) Resonance Frequency Compatible
SI-KG2 0-2 N  0-200 250  0.15  1.3 kHz  SI-H only
SI-KG2B 0-0.2 N  0-20  80 0.15 590Hz  SI-H only
SI-KG4 0-50 mN  0-5 15 0.5  1.2 kHz  SI-H only
SI-KG4A 0-20 mN  0-2 4 1 1.2 kHz  SI-H only

Milting, H., Janssen, P.M., Wangemann, T., Kögler, H., Domeier, E., Seidler, T., Hakim, K., Grapow, M., Zeitz, O., Prestle, J., and Zerkowski, H-R.: FK506 does not affect cardiac contractility and adrenergic response in vitro. Eur J Pharmacol. 2001 Nov 2;430(2-3):299-304

Minekus,J., Visser, A., and Mastrigt, R v.,: Supramaximal stimuli do not evoke a maximal contraction in urinary bladder smooth muscle fibre. Urol. Int. 67:62-68 (2001)

Minekus,J., and Mastrigt, R v.,: Length dependency of the contractility of the urinary bladder smooth muscle. J.Muscle Res. Cell Mot. 20:101-102 (1999)

Müller-Ehmsen, J., Brixius, K., Hoischen, S., and Schwinger, R. H. G.: Inotropic and Coronary Vasodilatory Actions of the K-Adenosine Triphosphate Channel Modulator Nicorandil in Human Tissue. The Journal of Pharmacology and Experimental Therapeutics JPET 279:1220-1228, 1996

Müller-Ehmsen, J., Frank, K., Brixius, K., and Schwinger, R. H. G.: Increase in force of contraction by activation of the Na+/Ca+-exchanger in human myocardium. Br. J. Clin. Pharmacol. 1997; 43:399-405

Müller-Ehmsen, J., Brixius, K., Schulze, C., and Schwinger, R. H. G.: Na+ Channel modulation and force frequency relationship in human myocardium. Naunyn-Schmiedeberg`s Arch. Pharmacol.(1997) 355:727-732

Zobel, C., Brixius,K., Pietsch, M., Münch, G., Bölck, B., and Schwinger, R. H. G.: Unchanged sarcoplasmic reticulum Ca2+-ATPase activity, reduced Ca2+ sensitivity, and negative force-frequency relationship in transgenic rats overexpressing the mouse renin gene. J.Mol.Me3d. (1998) 76:533-544)

Anthony J. Bakker and Helen M. Berg. Effect of taurine on sarcoplasmic reticulum function and force in skinned fast-twitch skeletal muscle fibres of the rat Journal of Physiology (2002), 538.1, pp. 185-194

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