The API 4059 G accepts a strain gauge, bridge, load cell, or a summed input
from up to four sensors, and provides a proportional, isolated DC voltage or current
output. It includes filtering and processing to allow effective use of low-level
transducers in the noisy environments found in industrial applications. The full
3-way (input, output, power) isolation makes this module useful for ground loop
elimination, common mode signal rejection or noise pickup reduction.
The adjustable bridge excitation power supply generates a stable source of
excitation voltage to drive from one to four 350 Ω (or greater) bridge type sensors
such as load cells, pressure transducers and strain gauges and amplifies
and converts the resulting millivolt signal into the selected output. Sense lead
circuitry is included to cancel the effects of leadwire resistance, if required.
Input, output, excitation and zero offset are field-configurable, via external rotary
and slide switches. Common ranges are on the module label. Offsets up to
±100% of span can be used to cancel sensor offsets or non-zero deadweights
(taring). Non-interactive zero and span simplifies calibration.
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