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Honeywell Sensotec Frequently Asked Questions |
What is Output Span Temperature effect?
Output Span refers to the output between zero and full scale. The output
span is the output value of the sensor at full pressure (Calibration factor),
expressed as mV/V. A sensor with a calibration factor of 3 mV/V will exhibit
30 mV at full pressure if it is being supplied with 10V power.
Output span
Output span varies with temperature. In the example figures below, a constant
800 PSI is applied to the transducer. As the transducer is elevated to a
higher temperature the output changes- even though pressure has not.
Constant pressure and voltage yield constant output
Output changes with temperature for a given Pressure and Voltage
Span Temperature Compensation Resistors offset Temperature effects
Uncompensated and compensated error plots
During manufacture compensating resistors are added to minimize the variation
in span due to temperature. A graph of effective temperature compensation
is shown. The temperature effect on span is measured as a percentage change
in rated output per degree of temperature change.
Sensotec Note:
A typical Sensotec transducer has a specification of 0.002% Reading / degree
F. This means that a 10,000 psi sensor measuring 5000 psi will exhibit 0.1
psi error for each degree of temperature change.
Pressure transducer with zero and span adjustment pots behind protective
screws
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