18
5.2 Sensor
Menu
The sensor menu provides the following settings: Calibration history (informational
only), 1 point calibration, Days between Calibration, Units of measure, Control
mode, and New sensor set-up. Each is discussed in detail below. Refer to the Sensor
Menu Chart.
Note: If you are programming the unit for the first time, scroll to the Cu Mode menu
and set the "Cu Mode" option first, choosing either Electroless Copper or Microetch
mode. Then press
PREV
to choose units of measure. Then press
NEXT
to set the
rest of the menus.
Cal'd
Displays the date of the last sensor calibration.
1 Pt Calibration
Press
ENTER
to perform a 1 point calibration of the copper sensor. This calibration
is best performed at normal operating temperature.
Keep the immersible sensor in place or have solution flowing through the flow-
through sensor. Take a sample of the solution and note the concentration displayed
by the WCU controller. Carefully perform the normal laboratory analysis of the
copper concentration. Calculate the offset by subtracting the displayed value from
the lab results. If the lab analysis is significantly different, adjust the offset in the 1
point calibration menu, using the arrow keys to change the value and the +/- sign. If
the controller's display is higher than the lab analysis, the offset should be negative.
The maximum offset for a one point calibration is 7 g/l(0.7 oz/gal) from the last new
sensor setup value. If you have an offset larger than this, then perform a new sensor
setup (see next page).
Days Btwn Cal
Use the arrow keys to set the number of days that you would like to go by before
recalibrating the sensor. The controller will prompt you to recalibrate when that time
has expired. Setting this to zero days will disable the calibration reminder.
Conc. Units
Press
ENTER
to change the units of measure. Use the Up and Down arrows to
toggle between grams per liter and ounces per gallon, then press
ENTER
to make
your selection. The controller will warn you to check your set points, since all set
point values will stay the same even though the units of measure may have changed.
Cu Mode
Press
ENTER
to change the controller from Electroless copper mode to Microetch
mode by toggling between the two choices using the Up and Down arrow keys. The
controller will warn you to check your set points, since these do not change when
the Cu Mode is changed.
