Metex 2200R ORP Analyzer/Controller - Manual (Page 19)

Model 2200R Page 17
5.10 Cycle Feature for Relays A and B
3.5.1 The 2200R has a cycling feature for the control relays. 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.
c) If you wish to have cycling control for Relay A, you must put DIP switch NO. 3
of Bank S2 in “ON” position. Similarly, if you wish to have cycling control for
Relay B, put DIP switch No. 4 of Bank S2 in “ON” position (See Section 4.7). If
either of these two switches is in “OFF” position, the corresponding Relay will
act in a simple ON-OFF manner.
d) The following example describes how to enter the ON and OFF times for Relay
A cycling control.
iii) Enter the menu by pressing Call, proceed by pressing CALL until the
CYCLE A LED illuminates.
iv) 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.
v) 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.
vi) With this configuration when the process reaches the Relay A Setpoint
the relay will cycle continuously 30 seconds activated, 60 seconds
deactivated until the Deadband Relay A setting is passed.
NOTE: As shipped from the factory the OFF time is set at 10 seconds and the
ON time is set at 5 seconds.
iii) If desired, program Relay B cycling as above, but using the cycle B
menu item.
5.11 Alarm High
3.5.1 The instrument is fitted with a relay, which is set to activate on both high and low
alarm conditions. The deadband is factory set. To set the ALARM HIGH proceed
as follows.
e) Press CALL to enter the menu, proceed by pressing CALL until the ALARM
HIGH LED is illuminated. Use the arrow keys 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.