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Pressure Transmitter Terms

Accuracy – The combination of the error of nonlinearity, repeatability and hysteresis, expressed as a percentage of full scale output.
 
Axial Load – A load applied alongside or parallel to and concentric with the primary axis.
 
Best Fit Straight Line – The sensitivity of a sensor that is preferably in a straight line, but usually has minute non-linearity. BFSL takes all the data points from the curve and describes a straight line through these data points so that the divergence (and thus the error) between the curve and the straight line is at a minimum.
 
Burst Pressure – The maximum amount of pressure that may be applied to an object without the object rupturing.
 
Calibration – A test in which known values of pressure are applied to the instrument and output readings are recorded under specific conditions. (http://www.calibratingservices.com)
 
Dead Volume – The volume of the pressure port of a transducer at room temperature and barometric pressure.
 
Differential Pressure – The difference between the actual measured pressure and a fixed reference point.
 
Error – The difference between the true value of the pressure that is sensed and the value indicated by the transducer
 
Excitation – The voltage or current applied to the input terminals of the transducer to supply its proper operating conditions.
 
Gauge Pressure – The difference between the atmospheric pressure and a variable pressure.
 
Hysterisis – The maximum difference in output within the range when the value is approached with increasing pressure and then with decreasing pressure for full range traverses.
 
Linearity – The maximum deviation of the calibration curve (average of upscale and downscale readings) from a straight line positioned to pass through the upper and lower range values.
 
Noise – Undesirable signals that can increase the amount of error. Examples of noise include radio frequency interference, electromagnetic interference, hum from power lines and broadband or white noise.  
 
Output – The electrical signal that results from applied pressure to the transducer.
 
Peak Pressure – The greatest pressure desired that is sensed during a measurement session.
 
Pressure Rate – An orderly change in pressure over a specific time.
 
Repeatability – The closeness of agreement among a number of consecutive measurements of the output for the same value of the input under the same operating conditions, approaching from the same direction, for full range traverses.
 
Sensing Element – The part of the transducer that reacts directly as a response to pressure.
 
Variable Pressure – A change in the pressure that is being measured or controlled.
 
Zero Balance – The rated output signal of a transducer without a load applied and rated excitation, typically articulated as a percent of rated output.