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Daviteq Tower Vibration (TVS)  Sensor
LoRaWAN
Sigfox
Sub-GHz
NB-IoT

Daviteq Tower Vibration (TVS) Sensor

TVS

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Replaced SKU

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1. Introduction

Overview

Daviteq Tower Vibration (TVS) sensor is a special vibration sensor to monitor the vibration of telecommunication towers, electrical towers, wind turbine and lighting poles... With advanced vibration sensor and digital processing, it delivers accurate vibration parameters like displacement, frequency, and tilt angles... With a built-in Wind speed and wind direction sensor, it can deliver the vibration parameters associated with the wind speed and wind direction at the same time.


The TVS can be integrated into the wireless transmitter from Daviteq, such as Sub-GHz WS433, LoRaWAN WSLRW, and Sigfox WSSFC, to build the complete Wireless Tower Vibration Sensors.

The TVA is also powered by the solar panel and chargeable batteries in the wireless transmitter.


Specification

Sensor technology: High precision Dual-axis vibration sensor. tilt sensor and Solid-state wind sensor

Measurement: Displacement, Frequency, static Tilt angles, Wind speed, and Wind direction

Displacement range: ±1200mm

Displacement resolution: 1mm

Displacement accuracy: ±5% RD for Range 50-1200mm, ±0.5% RD for Range < 50mm

Frequency range: 0.15∼1.00 Hz

Frequency resolution: 0.01 Hz

Frequency accuracy: ±0.1 Hz

Tilt angle range: ±30°

Tilt angle resolution: 0.001°

Tilt angle repeatability: ±0.01°

Wind speed range: 0 - 50 m/s

Wind speed resolution: 0.1 m/s

Wind speed accuracy: ±3% of Reading

Wind direction range: 0-360°

Wind direction resolution: 1°

Wind direction accuracy: ±1°

2. Principle of Operation

TVS includes 3 measurement modules: motion displacement module, tilt module and wind module. Motion displacement module measure displacement and frequency X axis and Y axis.  Tilt module measures tilt for X axis and Y axis while wind module measure wind speed and wind direction.


Operation principle of motion displacement module

When the sensitive parts are acted on by external force (displacement), the pendulum mass M deviates from the original equilibrium position to produce a small relative displacement, which is detected by the differential displacement detector C with high sensitivity, and the output is After the voltage change proportional to the relative displacement is amplified by the servo amplifier S, the proportional feedback amplifier P, the differential amplifier D and the integrating amplifier I are directly input into the driving coil connected to the pendulum with the driving current In to generate a strong electromagnetic feedback back to zero torque. When external displacement or force occurs, the pendulum always remains at the original zero position, and the feedback current required to maintain the zero position is used to detect the magnitude of the vibration and provide the output, which is called the principle of force balance. For this reason, as long as the electrical parameters of the integrate feedback circuit of the system are adjusted, the natural period and damping coefficient can be changed to achieve a response frequency of 0.15~20Hz and ultra-low frequency motion displacement detection of mm level, without being affected by the external climate and environment.


Operation principle of tilt module

Tilt module utilizes the three-axis high-accuracy MEMS acceleration sensor to calculate the static Euler angles of the object it is mounted on.


The microprocessor of the Wireless transmitter will capture the raw signal of 2-axis acceleration the calculate the tilt angle of X, Y. Here are the final output values of the device.


X Tilt value

  • 16-bit signed integer

  • X_TILT_VALUE = X_TILT_VALUE_X1000 / 1000

  • Range: -30.000 to 30.000

Y Tilt value

  • 16-bit signed integer

  • Y_TILT_VALUE = Y_TILT_VALUE_X1000 / 1000

  • Range: -30.000 to 30.000




3. Calibration

The Daviteq TVS sensor is factory calibrated. For the tilt module of the device is calibrated in 3 positions:

        1. X tilt and Y tilt equal 0°

        2. X tilt equals +30°

        3. Y tilt equals +30°

After fixing the device, please perform the CALIBRATION_ENABLE command on the main device (depending on the type of device, which is Sigfox or LoRaWAN or Sub-GHz...).

4. Application Notes

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5. Installation Notes

The TVS sensor is built-in with the main device. Therefore, please refer to the installation guidelines for the sensor as below:

  • Tilt angle must in measurement range from -30 to 30 degree.

  • The sensor needs to be installed parallel to the surface of the measured surface or on the base bracket.

  • The sensitive axis of the sensor should be parallel or coincident with the displacement direction of the measurement surface.

  • The installation plane should be as rigid, hard and smooth as possible, the base of the sensor should be in rigid contact with the installation plane as much as possible, and the installation plane should be selected as far as possible at the center of mass of the measured target to reduce the disturbance of dynamic acceleration.

  • Tighten the screws evenly in turn to avoid excessive mechanical stress causing the installation bottom surface to deform and cause installation errors.

  • Try to ensure that the installation base is level to reduce the measurement error caused by the uneven installation base of the sensor.

6. Troubleshooting

  1. The wireless transmitter is still running and sending data. However, all the measurement parameters are not updated with new values.

    1. The connection between the TVS sensor and the wireless transmitter is broken: Contact the manufacturer for repair or replacement.

    2. The battery is almost draining off: Check the battery status and replace it when necessary.


  2. The measured values are not as expected.

    1. The installation direction is not correct: Re-check the installation.

    2. The sensor is drifting: Contact the manufacturer for repair or replacement.

    3. The calibration position or calibration process is incorrect: Re-calibrate the device with right position and right process.


  3. The reading values are very noisy even though the sensor is in a standstill position.

    1. The sensor got a problem: Contact the manufacturer for repair or replacement.

    2. External factors at installation location such as wind, vibration, temperature, sun, heat might affect the tilt value: Remove or limit external factors such as wind, vibration, temperature, sun, heat at installation location.

    3. The sensor is NOT rigidly connected to the measured structure: fix the installation to make sure rigid connection.


  4. The value of HW_Error equal 1

    1. The lost connection between the measurement modules and the wireless transmitter: Contact the manufacturer for repair or replacement.

    2. The sensor TVS sensor got a problem: Contact the manufacturer for repair or replacement.


7. Maintenance

The SMT soil sensor is a maintenance-free sensor. 

8. Default Configuration