Metex 2200C Conductivity Analyzer/Controller - Manual (Page 16)

Model 2200C Page 14
b) Press RUN, to place the instrument on line, or press CALL for another menu
selection.
5.5 Control Relay Deadband
5.5.1 If you have configured the relay to control decreasing conductivity, the deadband
will be higher than the setpoint. i.e. the auxiliary device connected to the relay will
increase the conductivity. If you have configured the instrument to control
increasing conductivity, the deadband will be lower than the setpoint. i.e. the
auxiliary device connected to the relay will decrease the conductivity.
a) Enter the menu by pressing CALL, proceed by pressing CALL until the RELAY
DEADBAND 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.
b) Press RUN, to place the instrument on line, or press CALL for another menu
selection.
5.6 Cycle Feature for Control Relay
5.6.1 The 2200C has a cycling feature for the control relay. This feature if enabled will
cause the relays to cycle based on the on and off times selected. This useful
feature can help eliminate overshooting, saving expensive chemicals.
a) If you wish to have cycling control for the Control Relay , you must put DIP
switch NO. 1 of Bank S2 in “ON” position. (See Section 4.7). If the dip switch is
in the “OFF” position, the Relay will act in a simple ON-OFF manner.
b) The following example describes how to enter the ON and OFF times for the
Control Relay cycling control.
i) Enter the menu by pressing Call, proceed by pressing CALL until the
CYCLE LED illuminates.
ii) With the arrow buttons make the display read the number of seconds
(maximum 600) you wish the relay to be activated. Example 30. Press
ENTER. The display will flash until ENTER is pressed again to confirm
entry.
iii) Press CALL. The LED will flash. Now make the display read the
number of seconds (maximum 600) you wish the relay to be
deactivated. Example 60. Press ENTER. Press ENTER again as
above.