The BTM-400PLUS measures the static tension of flat, V and ribbed belts of rubber, leather, fabric and composite materials acurately by measuring the natural frequency (Hz) of a segment of the belt. Just tap the section you want to measure while facing the sensor to that section it then converts it into tension units of newtons (N) or pounds force (lbf).
The instrument uses a pulsed ruby red light source to measure the natural frequency of the vibrating belt. Unlike competitive models, the BTM-400PLUS is NOT affected by ambient noise, providing quick reliable results in all production and field applications.
Maximum measurment frequentie 800 Hz, however most belts will break near 400Hz
Supplied with bothplug-in and cable-connected sensors
Includes two (2) separate Sensors – a plug-in type for one-handed operation and a cable-connected type for measuring belts with limited access space
Compact, easy-to-use design
Readings unaffected by nearby magnetic fields or noise
Displays tension in newtons (N) or pounds force (lbf) or natural frequency in Hertz (Hz) - selectable
Displays Menu in English, German, Spanish, Portuguese, French or Italian & others - selectable
The BTM-400PLUS is supplied as a complete kit, including:
- BTM-400PLUS belt tension meter
- plug-in sensor
- cable connected sensor
- 9-volt battery
- instruction manual
- delivered in a foam-fitted, hard plastic carrying case.
10 - 400 Hz (and higher)
± 5% or better
2 line LCD, 16 characters per line
free span length: up to 9.990 m belt mass: up to 9.999 kg/m
Free stand length: up to 9.99 m Belt mass: up to 9.999 kg/m
Operation: +10 °C ... 50 °C Transport: -5 °C ... +50 °C
85% RH, max.
126 x 80 x 37 (LxWxH)
Weight net (gross)
Approx. 170 g (approx. 660 g)
External Probe Dimensions
*BTM-400PLUS can measure up to 800 Hz, however most belts will break near 400Hz
**Static tension (T) accuracy depends on the precision of
entered values for free belt span (L), density (d) and natural
frequency (f) of the vibrating free belt span, that has been plucked or
struck, as noted in the relationship: T = 4dL2f2.
Note that highest accuracy is achieved in the frequency mode where
readings are accurate to <1%, ± 1 Hz.