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BERU Sensors — Highly accurate and extremely reliable

Electronic control systems which pick up a wide variety of different parameters with highly accurate sensors are being used increasingly in motor vehicles. BERU sensors are developed in co-operation with the automotive industry and are adapted exactly to the respective application in the vehicle. The emphasis is on functional safety under extreme operating conditions.

The sensors which are represented here are special developments for the automobile industry and its systems suppliers.

You will find the sensor range for the International Aftermarket (IAM) in the latest Sensor Catalogue or in the BERU Product finder.


Temperature sensors

sensor-temperatur.jpg

Function:

Temperature sensors are used for the exact measurement of ambient temperatures. BERU High Temperature Sensors (HTS) for applications in diesel particle filters, oxidation catalytic converters, SCR systems, NOx storage cats and turbo chargers provide stability, and structural versatility in a measuring range of minus 40 to plus 950 degrees Celsius.

Areas of application: Temperature range:
Engine and transmission: fuel, coolant, oil, air -40 to 160 degrees Celsius
Exhaust gas systems -40 to 1,000 degrees Celsius
Auxiliary heaters -40 to 600 degrees Celsius

Measuring principle:

The sensor measures the temperature with a temperature-dependent resistor, e.g. a hot wire (NTC) or a thin-film platinum measuring resistor. The characteristic is stored in a control unit and therefore allows calculation of the temperature.

Variants:

  • High temperature sensor (HTS)
  • Miniaturised sensors

Speed sensors

sensor-drehzahl.jpg

Function:

Sensors for measuring speeds.

Area of application:

Engine control (crankshaft, camshaft), gear (drive and power takeoff speed), ABS systems (wheel speed).

Measuring principles:

Inductive transmitter
A measuring method in which a coil measures changes in the magnetic flow created by a tooth/gap geometry. The rotational movement of the gear wheel induces a voltage in the coil. The necessary magnetic field is supplied by the integrated permanent magnet. The transmitter wheel speed determines the amplitude and frequency of the induced alternating voltage.

Hall transmitter
Electronic measuring principle with the "Hall Effect". The sensitive element of the speed governor is a static or dynamic "Hall-IC" which gets its bias from a permanent magnet (back bias). The "Hall" evaluates the magnetic flow density in the hall plates and assigns them switching states (high/low) with an evaluation circuit. If a gear wheel moves past the sensor, the sensor signal projects the tooth geometry. The signal amplitudes are largely independent of the speed and distance from the gear wheel which gives it a clear advantage over inductive systems. In addition, the high integration of the Hall sensors enables intelligent sensors which have self-calibration functions for example.

Variants:

  • Inductive sensors with and without permanent magnet
  • Hall sensors with direction of rotation detection
  • Hall sensors with 2-wire interface

Other BERU products with sensor applications can be found on the pages: