Advantages
No Vibrating Wire Sensor Configuration Parameters
Any Manufacturers Sensor
High Operating Frequency
Minimised Sensor Wear
High Signal / Noise Ratio
Ensemble Averaged Results over multiple measurement cycles
No false peaks
Automatic frequency tracking for excitation signal
Temperature Compensation/ analogue 0-2.5V DC support.
High impedance circuit support
High Reliability for sensor cable deterioration
The only user configuration options associated with the use of the Vibrating wire sensor operations are the jumper settings used to assign the analogue input signal type and a User assigned parameter used to set the number of channels to scan. The greater the sensors being used the slower it takes for the slower it takes for the instrument to respond.
Maintaining the sensor excitation signal at resonance and in phase to the sensor echo signal ensures a good quality results from the sensors even when there is cable deterioration between the sensor and interface.
Disadvantages
Cable length restriction to 4Km (12,000 ft)
Long cable lengths above 4Km are not possible due to the propagation delay in transmitting the excitation pulse to the sensor. The propagation delay can cause the excitation pulse to be out of phase with the echo and act to reduce the over all signal amplitude.
Keynes controls have cable free systems that can get over the range problem and will do this at a lower cost than installing and maintaining long cable systems installations.
Conclusion
The VibWire-108 is very simple to operate and does not require prior knowledge of the vibrating wire sensor or operating conditions in order to make a measurement.
The instrument supports high impedance sensor circuit loads and will operate correctly even when the line resistance increases considerably above that of the sensor coil. This means that for most practical deployments cable reduction due to damage will have little if any effect on the overall measurements.