ALF319 Hand Brake Force Sensor

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Key features

• Low profile with finger grip
• Precise measurement with uneven load distribution
• Good extraneous load rejection
• Connector for easy cable replacement
• Force measurement unaffected by handbrake lever angle

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About the ALF319 Hand Brake Force Sensor

The ALF319 handbrake loadcell offers an excellent technical solution to measurement of an ergonomic force. The double shear web design and rigid low profile finger grip combine to maintain the same precision of measurement along the entire finger grip length. The typical unevenly distributed force applied by the human hand is measured with good repeatability and minimum error in a sense normal to the lever axis.

The ALF319 has been fitted directly to a handbrake lever and also adapted for production tests by using an easy fit socket molding, as care must be taken to ensure that the hand clamping forces are not measured in addition to the handbrake pull force the molding used a ‘dorsal fin’ to ensure hand clamping was avoided.

The standard range is manufactured in aluminium.

Uneven Hand Loading Errors
The uneven load distribution of a human hand has been replicated by applying point loads over the length of the loadcell. In the worst case, the extreme ends, the error is limited to <1% of the applied force.

Handbrake Angle Vector Errors
The ALF319 handbrake loadcell measures force perpendicular or normal to the handbrake lever. Variations of lever inclination angle can produce angular deviations between the applied force and the loadcell’s normal measurement axis. For angular deviations up to 33° to the loadcell's normal axis the load errors are limited to <1% of the applied force.

Notes
1. AL = Applied load.
2. RL = Rated load.
3. Temperature coefficients apply over the compensated range.

Connections
The ALF319 loadcell is fitted with 2 metres of PVC insulated 4 core screened cable type 7-1-4C. The cable is connected to the loadcell with a miniature 4 pin connector so that cable can be easily replaced if it is damaged.
Excitation + = Red, Excitation - = Blue, Signal + = Yellow, Signal - = Green, Screen = Orange.
The screen is not connected to the loadcell body.

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