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Honeywell Sensotec Frequently Asked Questions |
When Should I have Zero and Span adjustments on my pressure
detector?
Zero and span may shift due to deformation due to installation, temperature,
repeated loading, or sensor aging. The preferred method to adjust zero and
span is through the use of external instrumentation. This allows users to
track the changes they've made and revert back to previous values if needed.
Users may have pressure detectors with zero/span adjustments directly on
the unit. This also allows for zero and span adjustment, but does not allow
the user to track changes or revert to previous values. Once adjusted, the
sensor is no longer calibrated as it was from the factory. Users should
also consider the operating environment of the transducer when selecting
whether or not to use sensors with zero/span adjustments. If the sensor
is going to be inaccessible, then it would be better to not have adjustments
directly on the sensor.
A significant advantage of having the adjustment screws is that users can
get calibrated, precise output by use of annual testing and certification,
even as the transducer wears or ages in service.
Pressure transducer with zero and span adjustment pots behind protective
screws
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