Contacting Multi-Turn Position Sensors

Absolute position feedback for automotive seats

Automotive seats are, either manually or automatically, moved on an associated linear track assembly. Seat position sensors are used to provide comfort by allowing automatic seat adjustment, safety by controlling airbag deployment or convenience through memory functions.

The MT-150 series allows up to 150 turns mechanical travel to feedback linear position of the seat, while the MT-5 series has been designed for seat angle position sensing applications. Both series are sealed and feature a clutch function at end stops. They can be easily customized to meet customer requirements. Absolute position is mechanically stored so there is no need of active electronics thus avoiding problems such as memory being lost by current shortages.

For applications with functional safety requirements, Piher provides non-contacting sensors based on Hall-effect and inductive technology.



MT-150 MT-5
Resistance values 10k 10k
Tolerance ±20% ±20%
Nominal power (at 50°C) 0.15W 0.15W
Linearity ±5% ±5%
Taper Linear Linear
Max voltage 38 Vdc n/a
Voltage range 12.5% to 87.5% (±2.5%) 0.25V to 4.75V
MT-150 MT-5
Mechanical travel 150 turns ±4 up to 5 turns
Life (cycles) 6.000 8.000
MT-150 MT-5
Temperature range -40°C to +85°C -40°C to +85°C