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Honeywell Sensotec Frequently Asked Questions |
What is zero balance for a pressure transducer?
Zero Balance is the pressure sensor output when no pressure and proper
supply voltage are applied. Zero balance is expressed as a percentage of
full scale. For Gage pressure sensors, zero balance is measured at atmospheric
pressure (0 PSIG). For absolute pressure sensors, it is measured at full
vacuum (0 PSIA). Ideally, the output would be exactly zero, but it is not
due to several factors.
The electrical and mechanical components of transducers have inherent stresses
and offsets during the assembly process. These offset the zero balance.
Zero offset present during manufacture
During manufacture resistance is added to the bridge network to ensure
satisfactory zero balance for new transducers.
Zero balance resistor added to bridge network
Operating environment and transducer history can change the zero balance.
Factors include temperature, transducer age, and transducer overload.
If users notice a change in their zero balance, they may want to adjust
their balance using either external instrumentation or local zero adjustments.
Annual testing and certification can ensure precise output throughout the
life of the transducer.
Pressure transducer with zero and span adjustment pots behind protective
screws
Sensotec Note:
Sensotec adjusts it pressure sensors to have a zero balance for most sensors
of less than 1% and less than 0.5% for the TJE. Many amplified sensors have
zero and span adjustment potentiometers on the sensor itself so that customers
can carry out adjustment over the lifetime of the sensors.
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