Metex 2200C Conductivity Analyzer/Controller - Manual (Page 13)

Model 2200C Page 11
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 CALL, the relays and the analog
outputs are automatically placed on hold and remain on hold until the instrument
returns to on line. The output hold will remain for a maximum of 10 minutes after
the last button was pressed, if this feature has been enabled. See Section 4.7.
4.9 Parameter and Operation Checking
4.9.1 The instrument continuously checks all parameters in its memory, while measuring
the conductivity. When it detects an invalid value, it flashes the LED in the
operation menu to indicate the parameter that is at fault. You must then access the
operations 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 2200C. When in the
test mode the display will show a value between 0 and the max range the unit has
been configured for. 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
conductivity. 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.
4.11 Control Relay AUTO/OFF/ON Switch
4.11.1 The AUTO/OFF/ON button is used to set the operating mode of Relay A. This
useful feature allows the operator to check the operation of the device controlled by
the relay. On power up the control relay always returns to the AUTO setting. Be
sure to return to AUTO after completing your test if you wish to work automatically.
4.12 Utility Menu
4.12.1 The Utility Menu is provided to enable authorized personnel to change the range
and to fine tune the analog outputs. Refer to Section 8.0.
4.13 Watchdog Timer and Self Diagnostics
4.13.1 The 2200C continuously monitors the condition of all key components of the
measuring system to ensure that the measurements are reliable. Invalid entries and
memory loss are indicated on the panel. Refer to Section 8.0.