Vibrating Wire Sensor Configuration
The vibrating wire devices transmit in raw units: frequency and thermistor resistance. To automatically convert these values to temperature and pressure, the calibration coefficients of the piezometer and thermistor need to be configured.
There are two methods available for converting the thermistor resistance to temperature:
By default, the temperature is automatically calculated with pre-set Steinhart-Hart coefficients. The default coefficients are derived by applying nonlinear regression to the following HMA Vibrating Wire Piezometer (Model 1200) resistance temperature table.
For the pressure calculation, the required fields are:
When the temperature is unavailable due to a sensor error, the pressure is calculated without temperature compensation, i.e. C_T=0.
After inputting the coefficients, select the date of when to begin the calculation of the temperature and pressure. Click Update and Recalculate to save and apply the changes.