Hach EC1000, Instruction Manual

Page: 32 / 128

32
repeat percentages or values. When all entries are made, return to the Controller MODE
options and select CURVE.
Example—(Assuming PH was selected for the controller MODE)
Press
ENTER
.
Select the percent (of reagent addition) for the first point (X axis) by pressing the
RIGHT
ARROW
key and the
DOWN ARROW
key or the
UP ARROW
key.
Press
ENTER
.
Select the PH value by pressing the
RIGHT ARROW
key and the
DOWN ARROW
key or the
UP ARROW
key.
The Controller prompts the user to continue entering the percentages and PH values
through nine entries (corresponding to number of points selected). The green LED display
continues to show which point selection is being made at any time even if the user scrolls
back to the beginning of the sequence.
Press
ENTER
then
CLEAR
followed by the
DOWN ARROW
key to advance to:
The function of the output trim adjustment is slightly different from the rest of the edit
functions. When the zero (minimum scale) trim is selected, the controller output is driven
to zero (minimum scale), and the output value is displayed with the right hand digit
flashing. If the output is too low, pressing and holding the
UP ARROW
key causes the
output to ramp up.
When the output is correct, release the
UP ARROW
key. If the output is too high, use the
DOWN ARROW
key. If a large adjustment is required (e.g., adjusting the controller zero
from 4 mA to 0 mA), use the
RIGHT ARROW
key to move the flashing digit to the left.
When the
UP
or
DOWN ARROW
keys are used, the output ramps faster.
Press
ENTER
.
Press
ENTER
.
This is the trim controller zero setting (in terms of mA output).
Press the
DOWN ARROW
key or the
UP ARROW
key to adjust the output.
Press
ENTER
.