User Manual
Model 2200P Page 13
4.7.3 The following table describes the use of the 16 DIP switches:
Bank S1
Dip Switch Description ON OFF
1 Selects temperature unit
°C °F
2 Password Feature Disabled Enabled
3 Fail-Safe mode for Relay A Enabled Disabled
4 Direction of Control for Relay A Falling Rising
5 Alarm Relay to be activated for memory loss Disabled Enabled
6 Fail-Safe mode for Alarm Relay Enabled Disabled
7 Reserved
8 0-5V / 0-1mA Select PH Temperature
Bank S2
Dip Switch Description ON OFF
1 Fail-Safe mode for Relay B Enabled Disabled
2 Direction of Control for Relay B Falling Rising
3 Cycling Control for Relay A Enabled Disabled
4 Cycling Control for Relay B Enabled Disabled
5 Reserved
6 Reserved
7 Reserved
8 Reserved
Note: Items in “BOLD” are the factory settings that the unit will be shipped with.
4.8 Output Hold
4.8.1 Output hold, is a function, which freezes all output signals at the last value to
prevent the occurrence of wild distortions during programming and maintenance.
4.8.2 When the Operations Menu is entered by pressing MENU, the relays and the
analog outputs are automatically placed on hold and remain on hold until the
instrument returns to on line. (unless you have used the arrow buttons while in
TEST) The output hold will remain for a maximum of 10 minutes after the last button
was pressed.
4.9 Parameter and Operation Checking
4.9.1 The instrument continuously checks all parameters in its memory, while measuring
the pH. When it detects an invalid value, it flashes a LEDs in the operation menu to
indicate which parameter is at fault. You must then access the operation menu to
take corrective actions.
4.10 Simulated Input for Testing
4.10.1 TEST is function that can be used to check the setup of the 2200P. When in the test
mode the display will show a value between 0.00 and 14.00. The arrow keys are
used to change the display. The relays and analog outputs will react to the changes
of the display as if it were monitoring the pH. This feature enables the user to verify
that the controller has been configured correctly, and that it will correctly react to the
process. Of course, the relays and outputs are no longer on hold once the arrow
buttons are used in TEST mode.