Metex 2200C Conductivity Analyzer/Controller - Manual (Page 11)

Model 2200C Page 9
4.5 Analog Outputs
4.5.1 The analog output signals consist of a non-isolated 0-1 mA, 0-5 Vdc, and isolated 4-
20 mA signals.
4.5.2 From the factory all of the analog outputs have a linear range corresponding to the
full range of the instrument. The analog outputs can be programmed to another
linear range by entering two values:
• Output High: This is the conductivity value at which you wish to have 100%
output.
• Output Low: This is the conductivity value at which you wish to have 0% output.
4.5.3 When programming, you must ensure that the output range has a span of at least
10% of the full range of the instrument. For applications that require the output to
decrease as the process value increases, i.e. an inverted output, the Output High
value will be less than the Output Low. See Section 5.3.
4.5.4 The instrument may be used to measure the temperature of the process either in °C
or in °F. The 2200C does not control temperature but the 0-5 Vdc and 0-1 mA
analog outputs can be dedicated to follow the process temperature. See Section
5.10.
4.6 Operation Menu
4.6.1 The operation menu allows the user to recall and to adjust the parameters, required
by the analyzer functions.
4.6.2 When the analyzer is powered up, the program will display the conductivity reading.
None of the LED’s in the operation's menu will be illuminated.
4.6.3 Five buttons on the panel are used to operate the menu. Use the CALL button to
step through the items in the menu. The red LED beside each item makes it very
easy to follow the menu. The function of the RUN button is to return to the on-line
conductivity display from anywhere in the menu. The analyzer has a built-in timer,
which returns the unit to the online mode if no button has been pressed for 10
minutes. This time-out has the same effect as pressing the RUN button.
4.6.4 When in the menu mode, the display will shows the current value of the parameter,
such as the Setpoint of the control relay. The two arrow buttons are used to adjust
the display value up or down. To accept the new value press ENTER twice. While
in the operations menu, the relay outputs and the analog outputs remain on hold.