Instruction manual

81
Output Time Limit
Type in the text box the maximum amount of time that the pH pump can be continuously running
before the controller shuts off the pump and activates an Output Time Limit alarm. This is
intended to prevent the pump from emptying an entire drum of chemical because of a problem
somewhere in the system.
Note that the pump will not run again until someone resets the timer! The time limit should be set
at approximately twice the normal worst case on time.
Output Mode
Click on the radio buttons to manually control the pH relay. The normal selection will be Auto,
where the controller uses the various set points to open and close the relay. You can force the relay
open (pump off) regardless of the set points by selecting Off, or force the relay closed (pump on)
regardless of the set points by selecting Hand.
If you select Off, the pump will not run again until either Hand or Auto is selected! If you select
Hand, the pump will run until either Auto or Off is selected, or until the Hand Time Limit
(programmed in the next menu) expires.
The Off mode is handy to prevent the pump from running while you are changing set points. The
Hand mode is handy to be able to test the pump, wiring, etc without needing to change set points.
Hand Time Limit
Type in the text box the maximum number of minutes that the pH output can be activated in the
Hand mode. Any value between 0 and 1440 is acceptable. A value of 0 means the output can be
left on indefinitely.
Click on the “Submit” button to save the changes.
Event Log
Click on the link to view the event log. The event log contains the date and time of each relay
activation and deactivation. The data will be a 1 if the relay is closed and a 0 if the relay is open.
The log also shows the state of the flow switch, with a 1 denoting flow, and a 0 denoting no flow.
A window will open to ask if you would like to open the file or save it to disc. Select the method
you would like to use. The file is a .csv (comma separated variable) file that will open in a
spreadsheet such as Excel.
6.24 ORP Output Menu (only appears if an ORP option card is installed)
ORP Control Mode
Click on the radio button of the option that matches your installation:
Direct ORP Sensor should be selected if you will be controlling the ORP relay based upon a
signal from an ORP electrode.
Direct ORP Sensor with Spike should be selected if you want to control the ORP relay to a lower
ORP set point for most of the time, and occasionally control to a higher set point for a defined
period of time.