The CHECKLINE BTM-400PLUS accurately measures the static tension of flat, V and ribbed belts of rubber, leather, fabric and composite materials by measuring the natural frequency (Hz) of a segment of the belt that has been tapped and then converting 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.
Similar to SKF PHL FM 10/400
- 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
- NIST and ISO-17025 Traceable Calibration Certificate – OPTIONAL
| Measuring Range* | 10 – 800 Hz |
| Indicator error | ±1 Hz |
| Total error | < 5 % |
| Sensing Distance*** | 0.200″ – 1.6″ (5 – 40 mm), typically (2.5″/60 mm max, depending upon ambient light & surface of belt to be measured) |
| Casing | ABS Plastic |
| Display | 2 line LCD, 16 character per line |
| Input Range | free span length: up to 9.990 m belt mass: up to 9.999 kg/m |
| Belt Density | Belt Density (d = kg/m or lb/ft) |
| Belt Span | Min, approx. 10 cm (4 inch) Max, no maximum (as long as belt will oscillate) |
| Warranty | 1 Year |
| Light Source | Red LED |
| Light Size | at 50mm – 6mm Square at 150mm – 15mm Square |
| Power Supply | 9V battery |
| Metric Units | MASS must be entered in kg/meter SPAN in “meters” |
| English Units | MASS must be entered in lbs/ft SPAN in “inches” |
| Operation Video | https://www.youtube.com/watch?v=-l4-uG0JIAc&feature=youtu.be |
| Country of Origin | Germany |
*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.
***Sensing distance can be extended when ambient light level is low also by adding a piece of reflective tape in the “target area” of the belt.
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