Hardware Transducers Calculating Sensitivity and ... have mislaid one. 2 Full Scale Output All GDS ... Transducers - Calculating sensitivity and full...
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125
Helpsheet
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Hardware Transducers Calculating Sensitivity and Full Scale Output
1 Introduction Many GDS transducers work using an excitation voltage, and return a linear output in millivolts directly proportional to the parameter being measured. To correlate this millivolt output with an actual quantity trying to be measured it is necessary to calibrate the transducer. The full-scale output value, the excitation voltage and the range of the transducer enables the sensitivity of the transducer to be calculated. All transducers calibrated by GDS have the sensitivity value shown on the calibration certificate, but some certificates require a calculation to be made. Copies of all calibration certificates are kept at GDS UK, so do not hesitate to contact us if you have mislaid one.
2 Full Scale Output All GDS transducers are supplied with a calibration certificate, which shows the millivolts that the transducer will output when at it’s maximum range. This is the full scale output and is usually given as a the value at full scale in millivolts. Some transducer calibration certificates give this full scale output value as millivolts per volt. In this case this value will need to be multiplied by the excitation voltage used (usually 10 Volts) to give the full scale output at that specific excitation voltage. Example 1 Full Scale Output = 29.95mV Excitation Voltage used at calibration = 10V So long as we are ALSO using the transducer with 10V excitation, the transducer FULL SCALE OUTPUT = 29.95mV. Example 2 Full Scale Output = 2.995mV/V Excitation Voltage used at calibration = 10V Here, the full scale output is given per volt excitation. Here we must multiply the full scale output supplied by the excitation voltage used. Using an excitation of 10V therefore fives a FULL SCALE OUTPUT = 2.995 x 10 = 29.95mV.
GDS Helpsheet 125 - Page 1
3 Calculating the Sensitivity of the Transducer To calculate the sensitivity value of a transducer, simply divide the range in units of the transducer by the full scale output value (as calculated in section 2).
Sensitivity =
Transducer Range FullRangeO utput
4 Example sensitivity calculations GDS Load Cell (required units are kN) Example1: GDS BA4958 Submersible Load Cell Range = 4kN Full scale output = 19.55mV Excitation Voltage used at calibration = 10V Excitation Voltage that will be used in Lab = 10V
Sensitivit y =
kN = kN / mV mV
Sensitivity =
4 = 0.2kN / mV 19.55
Example2: GDS BA4958 Submersible Load Cell Range = 4kN Full scale output = 1.955mV/V Excitation Voltage used at calibration = 10V Excitation Voltage that will be used in Lab = 10V
Sensitivity =
kN = kN / mV mV / V ×V
Sensitivit y =
4 = 0.2kN / mV 1.955 ×10
GDS Pressure Transducer (required units are kPa) Range = 500psi Full scale output = 200mV Excitation Voltage used at calibration = 10V Excitation Voltage that will be used in Lab = 10V To convert from PSI to kPa multiply by 6.8948
Sensitivity =
psi × 6.8948 = kPa / mV mV
GDS Helpsheet 125 - Page 2
500 × 6.8948 = 17.237kPa / mV 200
Sensitivity =
GDS Displacement Transducer (required units are mm) Range = 50mm Full Scale Output = 1000mV/V Excitation Voltage used at calibration = 10V Excitation Voltage that will be used in Lab = 10V Sensitivity value is shown on calibration certificate = 0.005mm/mV
Sensitivit y = Sensitivity =
mm = mm / mV mV
50 = 0.005mm / mV 10000
GDS Hall Effect Transducer (required units are mm) Range = 6mm Full Scale Output = 2727mV Excitation Voltage used at calibration = 10V Excitation Voltage that will be used in Lab = 10V Sensitivity value shown on calibration certificate = 2.2micron/mV = .0022mm/mV
Sensitivity =
mm = mm / mV mV
Sensitivity =
6 = 0.0022mm / mV 2727
GDS Mid Plane Pore Pressure Transducer (required units are kPa) Range = 15bar g Full Scale Output = 1.13mV/V/bar Excitation Voltage used at calibration = 5V Excitation Voltage that will be used in Lab = 5V To convert from bar to kPa multiply by 100
