Change language
Change language

ROTEC MEASUREMENT TECHNOLOGY

Sensors for torsional vibration analysis

Magnetic and optical sensors for rotational speed, direction of rotation and valve movement.

ROTEC Type A differential sensor

ROTEC MEASUREMENT TECHNOLOGY

Magneto-resistive differential sensors

Magneto-resistive differential sensors detect rotational speed at ferromagnetic gears. Different designs accommodate the available installation space.

TYPE A

TYPE A

Two-part design - the preferred direction can be set after mounting the sensor

Suitable for the standard temperature range -15°C to 100°C

Optionally with direction of rotation detection (4-fold sensor)
View data sheet
TYPE B

TYPE B

Short sensor length
Suitable for the standard temperature range -15°C to 100°C
High temperature sensor (temperature range -15°C to 160°C) with integrated cable, incl. adapter cable
View data sheet
TYPE C

TYPE C

Angled 90° sensor head
Suitable for the standard temperature range -15°C to 100°C
High temperature sensor (temperature range -15°C to 160°C) with integrated cable, incl. adapter cable
View data sheet
Discuss your measurement task

ROTEC MEASUREMENT TECHNOLOGY

Magneto-resistive differential sensors

Magneto-resistive differential sensors detect rotational speed at ferromagnetic gears. Different designs accommodate the available installation space.

TYPE A

TYPE A

Two-part design - the preferred direction can be set after mounting the sensor

Suitable for the standard temperature range -15°C to 100°C

Optionally with direction of rotation detection (4-fold sensor)
View data sheet

TYPE B

TYPE B
Short sensor length
Suitable for the standard temperature range -15°C to 100°C
High temperature sensor (temperature range -15°C to 160°C) with integrated cable, incl. adapter cable
View data sheet

TYPE C

TYPE C
Angled 90° sensor head
Suitable for the standard temperature range -15°C to 100°C
High temperature sensor (temperature range -15°C to 160°C) with integrated cable, incl. adapter cable
View data sheet

ROTEC MEASUREMENT TECHNOLOGY

Magneto-resistive differential sensors

Magneto-resistive differential sensors detect rotational speed at ferromagnetic gears. Different designs accommodate the available installation space.

TYPE A

TYPE A

Two-part design - the preferred direction can be set after mounting the sensor

Suitable for the standard temperature range -15°C to 100°C

Optionally with direction of rotation detection (4-fold sensor)
View data sheet
TYPE B

TYPE B

Short sensor length
Suitable for the standard temperature range -15°C to 100°C
High temperature sensor (temperature range -15°C to 160°C) with integrated cable, incl. adapter cable
View data sheet
TYPE C

TYPE C

Angled 90° sensor head
Suitable for the standard temperature range -15°C to 100°C
High temperature sensor (temperature range -15°C to 160°C) with integrated cable, incl. adapter cable
View data sheet
Discuss your measurement task

ROTEC MEASUREMENT TECHNOLOGY

Magneto-resistive differential sensors

Magneto-resistive differential sensors detect rotational speed at ferromagnetic gears. Different designs accommodate the available installation space.

TYPE A

TYPE A

Two-part design - the preferred direction can be set after mounting the sensor

Suitable for the standard temperature range -15°C to 100°C

Optionally with direction of rotation detection (4-fold sensor)
View data sheet
TYPE B

TYPE B

Short sensor length
Suitable for the standard temperature range -15°C to 100°C
High temperature sensor (temperature range -15°C to 160°C) with integrated cable, incl. adapter cable
View data sheet
TYPE C

TYPE C

Angled 90° sensor head
Suitable for the standard temperature range -15°C to 100°C
High temperature sensor (temperature range -15°C to 160°C) with integrated cable, incl. adapter cable
View data sheet
Discuss your measurement task

ROTEC MEASUREMENT TECHNOLOGY

Laser sensors and grating patterns

Laser sensors detect rotational speed by scanning a black-and-white zebra pattern. Grating tapes and discs are available in standard sizes. A correction mechanism in RAS Software accounts for the join when grating tape is used.

Laser sensor (SeLas 4/5)

Laser sensor (SeLas 4/5)

Scanning of the object from the front or via a deflecting mirror at a 90° angle possible.

Fibre optic cable available with textile or metal sheathing.

View data sheet
Grating patterns

Grating patterns

High-quality grating patterns support the quality of the rotational speed signal.

Grating tapes and discs are available in standard sizes. Custom patterns are available on request.

Discuss your measurement task

ROTEC MEASUREMENT TECHNOLOGY

Laser sensors and grating patterns

Laser sensors detect rotational speed by scanning a black-and-white zebra pattern. Grating tapes and discs are available in standard sizes. A correction mechanism in RAS Software accounts for the join when grating tape is used.

Laser sensor (SeLas 4/5)

Laser sensor (SeLas 4/5)

Scanning of the object from the front or via a deflecting mirror at a 90° angle possible.

Fibre optic cable available with textile or metal sheathing.

View data sheet

Grating patterns

Grating patterns

High-quality grating patterns support the quality of the rotational speed signal.

Grating tapes and discs are available in standard sizes. Custom patterns are available on request.

ROTEC MEASUREMENT TECHNOLOGY

Laser sensors and grating patterns

Laser sensors detect rotational speed by scanning a black-and-white zebra pattern. Grating tapes and discs are available in standard sizes. A correction mechanism in RAS Software accounts for the join when grating tape is used.

Laser sensor (SeLas 4/5)

Laser sensor (SeLas 4/5)

Scanning of the object from the front or via a deflecting mirror at a 90° angle possible.

Fibre optic cable available with textile or metal sheathing.

View data sheet
Grating patterns

Grating patterns

High-quality grating patterns support the quality of the rotational speed signal.

Grating tapes and discs are available in standard sizes. Custom patterns are available on request.

Discuss your measurement task

ROTEC MEASUREMENT TECHNOLOGY

Laser sensors and grating patterns

Laser sensors detect rotational speed by scanning a black-and-white zebra pattern. Grating tapes and discs are available in standard sizes. A correction mechanism in RAS Software accounts for the join when grating tape is used.

Laser sensor (SeLas 4/5)

Laser sensor (SeLas 4/5)

Scanning of the object from the front or via a deflecting mirror at a 90° angle possible.

Fibre optic cable available with textile or metal sheathing.

View data sheet
Grating patterns

Grating patterns

High-quality grating patterns support the quality of the rotational speed signal.

Grating tapes and discs are available in standard sizes. Custom patterns are available on request.

Discuss your measurement task

ROTEC MEASUREMENT TECHNOLOGY

GMR sensor for valve dynamics

The Sensitec GLM711AVB is designed for passive scales with a 1 mm pitch. A bias magnet and sensor element share a compact housing. With a ferromagnetic tooth structure, it provides two analogue signals, sine and cosine, phase-shifted by 90 degrees.

Typical applications include valve lift curves in a fired engine and valve rotation measurement.

GMR Sensor

GMR Sensor

Features GMR sensor

Very compact size
Magnetically biased
Wired ready for connection

Applications

Valve lift measurement in combustion engines
Valve rotation measurement
Tappet rotation measurement
Measurement on gear wheels or gear racks
Measurement on sliding cam mechanisms
Many other applications with toothed structures

View data sheet
Discuss your measurement task

ROTEC MEASUREMENT TECHNOLOGY

GMR sensor for valve dynamics

The Sensitec GLM711AVB is designed for passive scales with a 1 mm pitch. A bias magnet and sensor element share a compact housing. With a ferromagnetic tooth structure, it provides two analogue signals, sine and cosine, phase-shifted by 90 degrees.

Typical applications include valve lift curves in a fired engine and valve rotation measurement.

GMR Sensor

GMR Sensor
Features GMR sensor

Very compact size
Magnetically biased
Wired ready for connection

Applications

Valve lift measurement in combustion engines
Valve rotation measurement
Tappet rotation measurement
Measurement on gear wheels or gear racks
Measurement on sliding cam mechanisms
Many other applications with toothed structures

View data sheet

ROTEC MEASUREMENT TECHNOLOGY

GMR sensor for valve dynamics

The Sensitec GLM711AVB is designed for passive scales with a 1 mm pitch. A bias magnet and sensor element share a compact housing. With a ferromagnetic tooth structure, it provides two analogue signals, sine and cosine, phase-shifted by 90 degrees.

Typical applications include valve lift curves in a fired engine and valve rotation measurement.

GMR Sensor

GMR Sensor

Features GMR sensor

Very compact size
Magnetically biased
Wired ready for connection

Applications

Valve lift measurement in combustion engines
Valve rotation measurement
Tappet rotation measurement
Measurement on gear wheels or gear racks
Measurement on sliding cam mechanisms
Many other applications with toothed structures

View data sheet
Discuss your measurement task

ROTEC MEASUREMENT TECHNOLOGY

GMR sensor for valve dynamics

The Sensitec GLM711AVB is designed for passive scales with a 1 mm pitch. A bias magnet and sensor element share a compact housing. With a ferromagnetic tooth structure, it provides two analogue signals, sine and cosine, phase-shifted by 90 degrees.

Typical applications include valve lift curves in a fired engine and valve rotation measurement.

GMR Sensor

GMR Sensor

Features GMR sensor

Very compact size
Magnetically biased
Wired ready for connection

Applications

Valve lift measurement in combustion engines
Valve rotation measurement
Tappet rotation measurement
Measurement on gear wheels or gear racks
Measurement on sliding cam mechanisms
Many other applications with toothed structures

View data sheet
Discuss your measurement task

QUESTIONS & ANSWERS

Frequently asked questions

Magneto-resistive differential sensors detect ferromagnetic tooth structures. Optical laser sensors scan a suitable grating pattern. Installation space, surface, temperature and the required direction information determine the choice.

Type A is optionally available as a four-fold sensor for direction detection. Suitable signal conditioning passes the direction information to the RASdelta speed card.

When grating tape is used, a correction mechanism in RAS Software can account for the join.

ROTEC supports measurement-point design, sensor installation, measurement and analysis. Training can be tailored to the application.

NEWS & TECHNICAL INSIGHTS

News and insights

Technical insights into rotational measurement and news from the ROTEC network.

Company · 11 June 2026

Rotec China Office officially begins operations

With its Shanghai office and regional contacts, ROTEC is expanding technical support for customers and partners in China.

Explore the China Office
Company · 11 June 2026

Why Rotec Munich has returned to its original name

The return to the original name connects ROTEC’s history with the continued development of precise rotational analysis and measurement technology.

Read the story
Technical insights · 11 June 2026

Measuring transmission error in wind turbine gearboxes

How transmission errors arise and how rotational and order analysis help investigate vibration and noise in wind turbine gearboxes.

Read the technical article