Wellerson Bastos, Marcos Pimenta Filho, Luiza Almeida, Marina Ferreira & Mauro Santos Junior
• Comparison with the calibration sheet: Confirm that the initial reading matches the value specified in the calibration sheet. Differences greater than 0.5% of the full scale may indicate issues. GEOKON allows a tolerance of up to 50 Hz2
/100, while Geosense permits up to 100 Hz2 /100[4,7,17] .
• Electrical resistance test: Measure the resistance of the coils and thermistor. The coil resistance should be 180 ± 10 and the thermistor resistance should be approximately 3,000. Infinite readings suggest broken cables, while very low values indicate short circuits[7,17]
.
Figure 7 presents a reference resistance table from the GEOKON 4500S manual, along with an example of a multimeter used for these measurements.
Figure 7. Reference table for resistance measurements between components of a vibrating wire piezometer (Source: Adapted from[4]
)
These steps are essential to ensure that the sensor is in optimal condition before installation. Identifying faults during the initial verification prevents future issues and ensures that the measurements are reliable and consistent with actual field conditions. The initial verification confirms that the sensor is in good working order before being installed, thereby avoiding potential issues that could compromise readings shortly after installation.
4.4. Procedures during installation The proper installation of the piezometer is essential to ensure accurate and interference-free measurements:
• Parameter configuration in dataloggers or readouts: Before installation, it is necessary to check whether the pressure (G) and temperature (K) correction coefficients are configured according to the
values provided by the manufacturer. Dataloggers with default parameters may show significant deviations if not correctly adjusted[7]
. When the piezometer is connected to a datalogger especially
plug-and-play models, such as those from RST Instruments, Worldsensing and Geokon, which come with default equations it is crucial to verify the compatibility between the pre-configured equation and
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