Shaft encoders convert shaft rotation to pulses
for accurate and precise measurements of river stage
or other water applications. Mechanical float and
pulley assembly rotates with fluctuating water
level. As a float rises or falls, a pulley rotates
the shaft of the encoder, generating signals for
both rotation direction and amount. SDI-12 absolute
encoders read the signals and send a calculated
water level to the datalogger. Incremental (quadrature)
encoders emit two pulse trains, one "up" and
one"down", which are recorded by the datalogger. The
datalogger adds or subtracts from a running total to
calculate the water level. The encoders are used
with water level measuring systems (such as the
GS-71, GS-86, GS-98) and output directly to a data
logger or telemetry system. The shaft encoders
measure the rising or falling water level to a USGS
primary record requirement accuracy of 0.01 foot.
Float Gage - Model 8850
