Follower Arm Potentiometers

MAINTAIN CONSTANT TENSION – The follower arm potentiometer is used to maintain constant tension when using a brake for producing unwind (payout) tension, or when using a clutch for rewind tension.

The arm rides on the roll, measuring the roll diameter. As the roll size decreases, the arm moves downward, rotating the potentiometer shaft. The power supply current automatically decreases, which decreases the brake (or clutch) torque to maintain constant tension.

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Follower Arm Potentiometers

Model Case Resistance
(Oms)
Electrical Angle
(Degrees)
Mechanical Angle
(Degrees) - No Stops
Drag Torque
(oz.-in.)
Overhung Load
(Lbs)
Model
F-12-6
Case
Aluminum
Resistance
(Oms)
500
Electrical Angle
(Degrees)
65
Mechanical Angle
(Degrees) - No Stops
360
Drag Torque
(oz.-in.)
4
Overhung Load
(Lbs)
20
Model
FM-4-2
Case
Miniature
Resistance
(Oms)
500
Electrical Angle
(Degrees)
65
Mechanical Angle
(Degrees) - No Stops
360
Drag Torque
(oz.-in.)
1
Overhung Load
(Lbs)
2