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    Lorenz Torque Sensors Terms and Definitions

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    omar shady
    This document defines various technical terms and specifications related to torque sensors, including definitions for passive sensors, active sensors, measuring range, repeatability, nominal torque, accuracy class, service torque, limit torque, signal, bandwidth, sensitivity, supply voltage, protection level, control signal, reading rate, moment of inertia, twist angle, ultimate torque, control signal excitation, pulses/revolutions, and abbreviations. It provides an overview of key sensor characteristics and performance metrics.

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    Lorenz Torque Sensors Terms and Definitions

    Uploaded by

    omar shady
    20 views2 pages
    This document defines various technical terms and specifications related to torque sensors, including definitions for passive sensors, active sensors, measuring range, repeatability, nominal torque, accuracy class, service torque, limit torque, signal, bandwidth, sensitivity, supply voltage, protection level, control signal, reading rate, moment of inertia, twist angle, ultimate torque, control signal excitation, pulses/revolutions, and abbreviations. It provides an overview of key sensor characteristics and performance metrics.

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    This document defines various technical terms and specifications related to torque sensors, including definitions for passive sensors, active sensors, measuring range, repeatability, nominal torque, accuracy class, service torque, limit torque, signal, bandwidth, sensitivity, supply voltage, protection level, control signal, reading rate, moment of inertia, twist angle, ultimate torque, control signal excitation, pulses/revolutions, and abbreviations. It provides an overview of key sensor characteristics and performance metrics.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    20 views2 pages

    Lorenz Torque Sensors Terms and Definitions

    Uploaded by

    omar shady
    This document defines various technical terms and specifications related to torque sensors, including definitions for passive sensors, active sensors, measuring range, repeatability, nominal torque, accuracy class, service torque, limit torque, signal, bandwidth, sensitivity, supply voltage, protection level, control signal, reading rate, moment of inertia, twist angle, ultimate torque, control signal excitation, pulses/revolutions, and abbreviations. It provides an overview of key sensor characteristics and performance metrics.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 2

    Obere Schloßstr.

    131  07172 /93730-0


    LORENZ MESSTECHNIK Gm bH 73553 Alfdorf Fax 07172 /93730-22

    Torque Sensors Terms and Definitions


    The definitions of the technical characteristics of all sensors largely relate to the VDI/VDE/DKD - guideline
    2639.

    Passive Sensor measurement characteristics up to nominal


    A passive sensor is a sensor without amplifica- torque.
    tion. The output signal, supplied by the sensor, is
    in the range of approx. 3 mV/V (depending on the
    applied strain gauge, the geometry and the mate-
    rial of the measuring body).
    Active Sensor
    An active sensor is a device with an amplifier.
    Usually the output signal of the sensor is ±10 V,
    ±5 V, 0...20 mA, 4...20 mA, 10 ±10 mA or 12 ±8
    mA. All sensors by Lorenz Messtechnik GmbH
    can be supplied with these output signals.
    Measuring Range
    The measuring range is the load range in which
    the guaranteed error limits may not be exceeded.
    Bridge Resistance
    Repeatability Bridge resistance is the ohmic resistance of the
    The repeatability is the maximum admissible out-
    complete measuring bridge.
    put signal change in relation to the output signal
    (indication in %). Temperature Coefficient of the Sensitivity
    The temperature coefficient of the sensitivity is the
    Nominal Torque change – related to the nominal sensitivity - of the
    Nominal torque is the upper limit of the measuring
    actual sensitivity resulting from a temperature
    range in which the specified error limits may not
    change of 10 K.
    be exceeded.
    Temperature Coefficient of the Zero Signal
    Accuracy Class The temperature coefficient of the zero point is
    The maximum single error of the sensor output
    the change – related to the nominal sensitivity - of
    signal (indicated in %) is smaller than the value
    the output signal of an unloaded sensor resulting
    related to the accuracy class. Hereby, the toler-
    from a temperature change of 10 K.
    ance of the sensitivity is not considered.
    Nominal Temperature Range
    Service Torque The nominal temperature range is the range of
    Service torque is the torque which the sensor may
    the ambient temperature in which the sensor
    be stressed with above nominal torque without
    complies with the technical data and error limits.
    changing its specified characteristics. The service
    torque range should be used in exceptional cas- Service Temperature Range
    es, only. The service temperature range is the range of the
    ambient temperature in which the sensor can be
    Limit Torque operated without occurrence of permanent
    Limit torque is the maximum permissible load of
    changes of the measurement characteristics.
    the sensor in which destruction of the measuring
    Within the service temperature range, specified
    system is not expected. At limit torque, the specif-
    error limits no longer apply.
    ic error limits no longer apply.
    Excitation Voltage
    Signal The excitation voltage is the required supply volt-
    Signal is the digital output signal of the sensor at
    age to allow error-free operation of a passive sen-
    angle and speed measurement. Generally, the
    sor.
    signal is 5 V TTL (either 5 V or 0 V).
    Sensitivity
    Band Width / Max. Dynamic Load (according Sensitivity is the output signal of a passive sensor
    DIN 50100) at nominal torque less the preload signal.
    Band width – related to nominal torque – is the
    sinusoidal varying dynamic load in the direction of Nominal Sensitivity
    the measurement axis of the sensor, which is The nominal sensitivity is the theoretically prede-
    tolerated by the sensor at a stress of 107 vibration termined rated value (sensitivity) of a passive
    cycles without causing significant changes of the sensor.

    Email: info@lorenz-sensors.com Technical changes under reserve 170114e.doc


    Internet: www.lorenz-sensors.com 1/2
    Obere Schloßstr.131  07172 /93730-0
    LORENZ MESSTECHNIK Gm bH 73553 Alfdorf Fax 07172 /93730-22

    Supply Voltage
    Supply voltage is the required operating voltage to
    allow error-free operation of an active sensor.
    Level of Protection according to DIN EN
    60529; VDE 0470
    The level of protection of a housing is determined
    by the letters IP and a two-digit code number. The
    number indicates the contact protection, foreign
    object protection and water protection for electri-
    cal equipment.
    Control Signal
    By a control resistance, a signal, corresponding to
    the sensitivity of the sensor, is generated in the
    sensor.
    Advantages: Recalibrations are reduced. Zero
    point and sensitivity can be con-
    trolled before each measurement.
    Function: Reading Rate / Sample Rate
    By parallel switching of the resistor RK to the The reading rate or sample rate indicates the
    measuring bridge R1, the measuring bridge is number of measurements per second.
    electrically de-tuned, so that a measuring signal of
    50 % or 100 % of the sensitivity is available at the Moment of Inertia
    output. The moment of inertia is the moment which a
    body opposes to the acceleration torque. The
    mass moment of inertia should be as small as
    possible to keep the stress of the measuring sec-
    tion as low as possible during the acceleration
    process.
    Limit Thrust Load
    The limit thrust load is the maximum force in axial
    direction (axial force) with which the sensor may
    be loaded.
    Twist Angle
    Limit Shear Force
    The twist angle occurs at the initiation of the nom-
    The limit shear force is the maximum shear force
    inal torque between test side and drive side of the
    (radial force) with which the sensor may be load-
    specimen. By a shift of the torsion angle, the natu-
    ed.
    ral resonance of the measuring body changes as
    well. To avoid interference caused by natural res- Output Signal
    onance changes, the torsion angle should be Output signal is a conditioned signal, necessary
    minimized. for the error free function of an active sensor.
    Ultimate Torque Limit Speed
    Ultimate torque is the stress which causes per- The limit speed (in rotating devices, usually ex-
    manent changes or destruction. pressed in r.p.m.) is the upper limit of the speed
    range that the sensor can permanently withstand.
    Control Signal Excitation
    For a sensor with an analog output the control
    signal can be switched on /off via a voltage signal. Explanation of Abbreviations
    Two switching positions can be defined: f.s. – Full Scale
    L < 2,0 V (Low- signal) and H > 3,5 V (High- sig-
    nal).
    The control signal of a sensor with a digital output Labels
    signal can be controlled by software. Label for the compliance with the
    Pulses / Revolutions safety requirements according to
    Pulses / revolutions are recorded at angle / speed the CE-guidelines
    measurement. By a second 90° offset encoder
    track and flank evaluation, the pulses / revolutions
    can be quadrupled.

    Email: info@lorenz-sensors.com Technical changes under reserve 170114e.doc


    Internet: www.lorenz-sensors.com 2/2

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