Metex 2200C Conductivity Analyzer/Controller - Manual (Page 15)

Model 2200C Page 13
c) The system is now calibrated. Press RUN to place the instrument on line or
use the CALL key to proceed to other menu items.
5.3 Analog Output Range Expand
5.3.1 To increase the resolution of the analog outputs, the range may spread over any
section of the scale. As long as it spans at least 10% of full scale. The best way to
describe this setup is by example. Suppose you wish the outputs to span from
400uS to 600uS. Proceed as follows:
a) Enter the menu by pressing CALL until the OUTPUT HIGH LED is illuminated.
Use the arrows keys to make the display read 600. Press ENTER. The display
will flash until ENTER is pressed again to confirm the value.
b) Press CALL and the OUTPUT LOW LED will illuminate. Use the arrow keys to
make the display read 400. Press ENTER. The display will flash until ENTER is
pressed again to confirm the value.
c) The analog output will now be at 0% when the conductivity of the solution is
400 µS and will increase to 100% when the conductivity of the solution is 600
µS.
d) Press RUN to place the instrument on line or press CALL for another menu
selection.
NOTE: A range expand of less than 10% of full scale is an invalid entry which will
be indicated by the LED flashing when you return to RUN. To correct,
return to the menu and correct the output settings.
5.4 Control Relay Setpoint
5.5.1 The Control Relays are configured by programming the Setpoint and Deadband.
•Setpoint: is the value at which the relay will energize
•Deadband: is the value at which the relay will de-energize
As shipped from the factory, Control Relay, is configured to control rising
conductivity. However, you may change the direction of the relay by changing the
position of the DIP switch. (Refer to Section 4.7)
5.5.2 The relay setpoint may be set at any point on the scale.
To program the setpoint. Proceed as follows:
a) Enter the menu by pressing CALL, proceed by pressing CALL until the RELAY
SETPOINT LED is illuminated. Now use the arrow keys to make the display
read the desired value. Press ENTER. The display will flash until ENTER is
pressed again to confirm the value.