
4.3 Keys
CAL key
When the CAL key is pressed, the instrument prompts for the calibration
access code:
Code 22 for calibration
Code 0 or any code for calibration data checking.
Press the CAL key to acknowledge the calibration data or to proceed
within the calibration menu.
ENTER key
The ENTER key has serveral functions:
Opens the Setup menu in measuring mode
Stores (acknowledges) data entered in Setup mode
Moving on within the function groups.
PLUS key and MINUS key
The PLUS and MINUS keys have the following functions:
Selection of function groups
Setting of parameters and numeric values
Relay operation in manual mode (see Ch. 4.4).
Pressing the PLUS key allows you to switch between the current input
in % and mA.
Repeatedly pressing the PLUS key displays the following settings in
sequence as secondary measured values:
1. Temperature display in °F
2. Hide temperature display
3. Measured value display in mV
4. Current input signal in %
5. Current input signal in mA
6. Back to basic setting
Repeatedly pressing the MINUS key outputs errors:
1. The current errors are displayed one after the other (max. 10)
2. After all the errors are displayed, the standard display is unhidden.
In function group F, you can define an alarm for each error code
separately.
REL key
The REL key toggles between the relay and manual cleaning start in
manual mode. In automatic mode you can output the corresponding
switch-on points (limit contactor) ot set points (PID controller) when
pressing the REL key. Pressing the PLUS key allows you to display the
settings of the following relay. Press the REL key to return to measuring
mode (automatic return after 30s).
AUTO key
The AUTO key is used to toggle between the automatic and manual
modes of operation.
Escape function
Press the PLUS and MINUS keys simultaneously to return to the main
menu. Press the PLUS and MINUS keys again to return to measuring
mode.
Locking the keypad
Pressing the PLUS and ENTER keys simultaneously for minimum 3s
locks the keypad against unintentional entries. However, all settings can
still be read. The code prompt displays the code 9999.
Unlocking the keypad
Pressing the CAL and MINUS keys simultaneously for minimum 3s
unlocks the keypad. The code prompt displays the code 0:
Operation Liquisys M CPM 223 / 253
18 Endress+Hauser
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