Precision Water Level Instrument
Unidata Manual 6293 - Precision Water Level Instruments Issue 2.1
1
1 6541B WATER LEVEL INSTRUMENT
The 6541B is a float operated precision water level instrument. Float-operated
instruments can be the most accurate way to monitor the level of a water
surface. The Unidata Model 6541B Precision Water Level Instrument can
achieve an operating accuracy and resolution of 0.1mm. This accuracy is
maintained for the service life of the instrument without calibration or
maintenance, apart from battery changes. The instrument has the range to
monitor surface and underground waters, and the precision to monitor rainfall
and evaporation. This Model 6541B instrument supersedes the Unidata Model
6541A instrument.
The instrument is normally connected to the water surface by a float system. As
the water level changes, this rotates the input shaft on which is mounted an
optical encoder. The encoder is continuously monitored and the instrument
tracks any water level changes updating the level displayed on the LCD display.
The very low mechanical friction and inertia of the instrument produce data of
high precision and accuracy. A replaceable battery pack powers the instrument
for more than 1 year.
1.1 Superseded
Instruments
The 6541B instrument supersedes the UNIDATA Model 6541A, 6509, 6531
instruments. For further information see the manuals for these products.
1.2 Manual
Organisation
Throughout this manual the model number 6541 will be used when describing
features common to all the 6541 family of instruments.
When describing features specific to an individual model of the 6541 family, the
model number will be used. For example: 6541B-11-C.
