Metex 2200R ORP Analyzer/Controller - Manual (Page 27)

Model 2200R Page 25
b) To check the temperature channel move the slide switch S41 from position “ON
LINE” to position TEST. Go to the TEMPERATURE Menu item. The display
should be 25.0°C ± 0.1°C, in which case the analyzer is in order and the
problem is in the sensor. Otherwise the problem is in the analyzer.
For normal operation both slide switches S40 and S41 must be in
“ON LINE” position.
9.3
“Escape” Procedure
9.3.1 If the instrument appears to be "DEAD", for example not responding to the buttons,
or not performing on line measurement and control, always try the reset feature
first, as described in 6.4.1.
9.3.2 a) The "ESCAPE" procedure is to be used normally at the factory only, when the
unit is powered with a new MCU. As a result, the internal non-volatile memory
(EEPROM) is "FORMATTED" and the factory values are loaded into it.
b) The "ESCAPE" procedure is to be used if a unit is serviced for a new MCU
insertion, in case where the MCU was not calibrated at AquaMetrix, or in case
of a memory loss problem, when so advised by AquaMetrix service support.
9.3.3 Before performing the "ESCAPE" procedure it is important to know that this
procedure provides the option to erase all programmed values and replace them
with the factory set default values. This is true for the control setpoints and
deadbands, the alarm settings and the analog outputs scaling. Also, the
temperature and the ORP calibration points will be set to their initial values. This
means, that the temperature and the ORP 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.
9.3.4
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 STATUS LED will turn red and status code 7 will be obtained to
show that the "ESCAPE" procedure was just performed.
9.3.5 After the "ESCAPE" procedure it is necessary to do the following:
a)
Calibrate the temperature as described in Section 7.4.
b) Tune the analog outputs and the temperature output span to suit your particular
application and loop. See Sections 7.5, 7.6 and 7.7.
g) Leave the Utility Menu by pressing RUN.
h) Calibrate the ORP, as described in Section 5.2.
i) Set up the user values for:
• Output High and Low – See Section 5.4
• Control Relay A – See Sections 5.5 and 5.6
• Control Relay B – See Sections 5.7 and 5.8
• Alarm Relay – See Sections 5.10 and 5.11