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Honeywell Sensotec Frequently Asked Questions |
Why is the output of my pressure detector quoted in mV/V?
The output of a strain gage based sensor is directly proportional to the
physical measurement the sensor is detecting and also the excitation voltage
across the bridge network. The full scale output of the transducer varies
directly with the excitation. 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,
but only 15 mV at full pressure if it is being supplied with 5 V.
Full scale output of 30mV/V pressure transducer
Output varies with supply voltage. If users don't know how much the supply
voltage change affected their output, then can not know how much pressure
changed.
Change in output without a change in pressure
Many users monitor transducer output AND power supply excitation. Changes
in output are compared to the supply voltage to discount effects from voltage
shifts. Using the mV/V relationship, users can tell how much of their output
change was due to an actual change in pressure.
We can prove that pressure was constant, even though output changed (Since
the ratio of output to supply is constant, pressure is constant)
This approach is known as a ratio metric measurement because it relies
on the ratio of voltage output to the calibration Factor (mV/V) to determine
pressure.
Sensotec Note:
Sensotec uses ratiometric measurement in all of its signal conditioning
to measurement pressure (and load, torque etc)
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