Precision Water Level Instrument
Unidata Manual 6293 - Precision Water Level Instruments Issue 2.1
19
4.6.2 Span & Zero Configuration.
The “zero” value is the level for I = 4mA. The “span” value is the level for I = 20mA.
To save power the 6541B zero & span values can be transposed providing a 20/4mA
output.
PRESS & HOLD UP &
DOWN BUTTONS
TURN WLI ON [Sw 8]
HOLD BUTTONS
FOR ~5S
SET ZERO VALUE WITH
BUTTONS
END
WAIT ~5S
START
DISPLAY WILL FLASH
“ZERO”
SET SPAN VALUE WITH
BUTTONS
WAIT ~5S
DISPLAY WILL FLASH
“SPAN”
NORMAL OPERATION
WILL
RESUME
