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You are here : Home → PRODUCTS → Inclination measuring instruments > Inclination measuring sensors > Digital Inclination Sensors

Inclination sensor ZEROTRONIC

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Availability: 2021 - 03 - 22

Describe:

*Remarks:ME = Full-scale errors (are mainly due to drift of zero)MW = Read Out (errors are mainly due to change of gain) no filter = raw valuesno filter = raw valueswith filter = floating average over 10 valuesHTR-calibration will reduce temperature coefficient by approx. 5 timesTA = ambient temperatureZEROTRONIC SENSOR TYPE 3 TECHNICAL SPECIFICATIONS The preceding page lists the technical data of the Type 3 and Type C sensors.The values shown there require a few detailed explanations.In contrast to a BlueLEVEL, which is (typically) used in a controlled environment and for a limited measuring period, applications with ZEROTRONIC sensors are usually different. These range from measurements under laboratory conditions, to long-term measurements of objects, which are exposed ...

Explain:

The sensors of the ZEROTRONIC-family have a digital inclination sensor and a digital data transmission. Working digitally, they provide the option to compensate for temperature changes and allow data communication over long distances without any loss of data. The combination of all these features ensures that theses sensors fulfil highest requirements regarding precision, resolution and temperatur stability. ZEROTRONIC SENSOR-GROUP ZEROTRONIC-sensors have established themselves in the market as the benchmark when it comes to high-precision inclination measurement in demanding applications. The ZERTRONIC family of sensors features the following characteristics: High resolution and high precision Excellent temperature stability Measuring ranges of ±0.5 to ±60 degrees Synchro...

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The combination of all these features ensures that theses sensors fulfil highest requirements regarding precision, resolution and temperatur stability.

ZEROTRONIC SENSOR-GROUP

ZEROTRONIC-sensors have established themselves in the market as the benchmark when it comes to high-precision inclination measurement in demanding applications.

The ZERTRONIC family of sensors features the following characteristics:

High resolution and high precision
Excellent temperature stability
Measuring ranges of ±0.5 to ±60 degrees
Synchronized registration of measuring values for several sensors
High immunity to shock
High immunity to electromagnetic fields

Inclination sensor ZEROTRONIC

Choice of two sensor types depending on the application:

ZEROTRONIC Type 3

ZEROTRONIC Type C

Common characteristics of the 2 sensors:

The outer dimensions and the electrical characteristics are identical.
The measuring element is based on a pendulum swinging between two electrodes. Depending on the inclined position of the system, the pendulum will change its position in relation to the electrodes and in so doing, the capacitance between the pendulum and the electrodes will change. The change of these capacitances is measured digitally.
The sensor cell is completely encapsulated and thus protected against changes in humidity.
Both sensors are calibrated over the complete measuring range with reference points stored in the EEPROM of the sensor.
Both sensors are equipped with a temperature sensor and are temperature calibrated allowing an excellent compensation for temperature changes.

Difference in characteristics of the two Sensors:

The pendulum of the ZEROTRONIC Type 3 is larger, which provides a significantly better signal-to-noise ratio for smaller inclinations. The ZEROTRONIC Type 3 is therefore better suited for high precision applications where only small inclinations are measured.
The mass of the pendulum of the ZEROTRONIC Type C is smaller than the one of sensor Type 3. This provides a higher stability if the sensor is permanently inclined.
Only ZEROTRONIC Type 3 provides the option of analog output (see page 110).

Inclination sensor ZEROTRONIC

The following list of characteristics should allow a proper differentiation and proper application of the 2 sensors:

ZEROTRONIC Type 3

High resolution, high precision for inclinations up to 10°
Excellent signal-to-noise ratio
Excellent repeatability
Excellent linearity
Excellent temperature stability

ZEROTRONIC Type C

Excellent precision for inclinations between 10° and 60°
Excellent repeatability
Excellent long-term stability in inclined position
Excellent linearity
Excellent temperature stability

Some typical applications for the ZEROTRONIC Type 3

Applications in which high precision and high resolution is first priority, and where only small inclinations are measured:
Adjustment of machines (e.g. pitch and roll)
Precise adjustment of absolute zero
Precise measurement of small inclinations in a heavy duty environment; e.g. exposure to outside temperature

Some typical applications for the ZEROTRONIC Type C include

Larger inclinations
Applications in which the sensor remains in inclined position over a longer eriod of time

CALIBRATION OF DIGITAL SYSTEMS

Each single sensor is individually calibrated over the complete measuring range as well as over the complete temperature range the sensor is going to be used in. These calibration values are stored as reference points in the EPROM of the sensor.

Two temperature calibrations are available:

The standard temperature calibration is well suited for sensors that are used in a typical laboratory or a machine shop environment: temperatures around 20° C and slow temperature changes.

The HTR-calibration (High Temperature Range) is suited for those sensors that are exposed to outdoor conditions. These sensors are calibrated at various temperatures, which ensures that they function well across the entire temperature range the sensor can be used, which is from – 40 °C to + 85 °C. Thanks to the extended and more elaborate temperature calibration, the HTR- sensors show a substantially lower temperature coefficient, which is about 1/5 of the value of a standard temperature calibration (see technical specification).

Remark:

Even with an HTR-calibration it has to be ensured that the sensors are protected against direct sunlight and that temperature changes are impacting the sensors evenly from all sides.

Inclination sensor ZEROTRONIC

WORKING PRINCIPAL

The high stability and accuracy of the ZEROTRONIC-sensors is among others based on the fact that only one single oscillator is applied which is switched by a SELECTOR alternatingly to the two electrodes. This approach ensures that temperature influences can be minimised and the long term stability is optimised. The frequency-differences between the two oscillating circuits are measured digitally and out of these values the inclination is calculated.

Due to this concept the signal to noise ratio can be optimised and the inclination can be detemined very accurately.

Inclination sensor ZEROTRONIC

DYNAMIC CHARACTERISTICS

Inclination sensors are highly sensitive acceleration sensors which are measuring he deviation from earth gravity. Each non-constant movement produces accelerations which will impact the inclination sensor: the stronger these external acceleration-components, the lower the resulting accuracy of the inclination measurement will be.

Inclination measurements on moving objects are basically possible if these physical parameter are kept in mind.

Examples of applications which are functioning well:

Roll measurement on machines which are moving evenly along one axis.
Inclination measurement on a boat which is in a protected harbour-area.
Inclination measurement on a container which is lifted.

By adapting measuring speed and integration time the accuracy can be optimised.
Examples of applications which are not functioning:

Inclination measurement on a train during a turn (the Coriolis acceleration is too big)
Inclination measurement on a boat on open sea (the accelerations due to the motion of the sea are too large)

Inclination sensor ZEROTRONIC

Various

Also the following expressions are common for an inclination sensor:

Tilt sensor
Digital inclinometer
Digital inclination sensor
Inclination sensors

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