Glossary of Terms Absolute Pressure – The pressure measured relative to zero pressure (vacuum). Ambient Conditions – The conditions (pressure, temperature, etc.) of the medium surrounding the case of the transducer. Or the environment of an enclosure (room, cabinet, etc.) surrounding a given device or equipment. Burst Pressure – The pressure which may be applied to the sensing element or the case (as specified) of a transducer without physical damage of either the sensing element or transducers case. Differential Pressure – The difference in pressure between two points of measurement. Excitation – The external supply applied to a device for it’s proper operation. Gage Pressure – Pressure measured relative to ambient atmospheric pressure. Referred to as pounds per square inch. Hysteresis – The maximum difference in output at any measured value within the specified range, when the value is approached first with increasing and then with decreasing pressure. Linearity – The closeness of a calibration curve to a specified straight line. Expressed as the maximum deviation of any calibration point on a specified straight line during any one calibration cycle. Pressure Transmitter – Provides a linear current output proportional to applied pressure. Pressure Transducer – Provides a linear D.C. voltage output proportional to applied pressure. Proof Pressure – The maximum pressure which can be applied to the sensing element of a transducer without changing the transducer performance beyond specified tolerances. Repeatability – The ability of a transducer to reproduce output readings when the same pressure value is applied to it consecutively under the same conditions, and in the same direction. Response Time – The length of time required for the output of a transducer to rise to a specified percentage of its final value as a result of a step change of pressure. Thermal Error – The maximum change in output, at any pressure value within the specified range, when the temperature is changed from room to specified temperature extremes. Thermal Zero Shift – The zero shift due to changes of the ambient temperature from room temperature to the specified limits of the operating temperature range. Thermal Span Shift – The span shift due to changes of the ambient temperature from room temperature to the specified limits of the operating temperature range.