Metex 2200C Conductivity Analyzer/Controller - Manual (Page 28)

Model 2200C Page 26
with the factory set default values. This means that the range selection and the
conductivity calibration must be performed after an "ESCAPE" procedure. After
that, all the control, alarm and scaling parameters mentioned above must be set to
the user values.
9.2.4 To perform the ""ESCAPE"" proceed as follows.
a) Turn off the power.
b) Press and hold the RUN button for about 3 seconds, while turning on t he
power. The FAIL LED will turn red and status code 7 will be obtained to show
that the "ESCAPE" procedure was just performed.
9.2.5 After the "ESCAPE" procedure it is necessary to do the following:
a) Tune the analog outputs and the temperature output span to suit your particular
application and loop. See Sections 7.4, 7.5, and 7.6.
b) Calibrate the system, as described in Section 5.2.
c) Set up the user values for:
• Output High and Low - See Section 5.3.
• Control Relay - See Sections 5.4 and 5.5.
• Alarm Relay - See Sections 5.7 and 5.8.
d) After all the above operations are performed the FAIL LED will turn
"green” and status "0" should be obtained.
e) The unit may be tested now, using the TEST menu item (See Section
5.8.), or the built-in self-testing feature, (See Section 9.1.5.)
e) Bring the unit on line for measurement and control.
9.3 Printed Circuit Board Replacement
9.3.1 a) To replace printed circuit boards, shut off all power to the 2200C, including any
independent power to the relay contacts. Make a record of the external wiring,
then disconnect the wires. Unplug the ribbon cable connector.
b) The power supply circuit board is fastened to the back of the enclosure by four
screws, remove the screws and the board is free. Reverse the procedure to
mount a replacement board.
c) The microprocessor circuit board is located on the swing-out assembly behind
the door. Swing the assembly out, lift it up to unseat the lower hinge pin (the
upper hinge pin is spring loaded.) The assembly is now free. The circuit board