Metex 2200R ORP Analyzer/Controller - Manual (Page 23)

Model 2200R Page 21
7.0 UTILITY MENU
7.1 Utility Menu Functions
3.5.1 The Utility Menu enables authorized personnel to perform the following:
• Calibrate the range of the instrument
• Fine tuning the 0-1 mA/ 0-5 Vdc output
• Fine tuning the 4-20 mA output
7.2 Access to Utility Menu
7.2.1 The Utility Menu is protected by password. To access the Utility Menu press and
hold both RUN and ENTER for five seconds until the PASSWORD LED illuminates.
The green STATUS light will flash. Now with the arrow keys make the display read
the password, 7. Press ENTER.
7.2.2 The Utility Menu is entirely separate from the Operation Menu but uses the same
menu LED’s. Press CALL to step through the menu items.
Below is the cross-reference between menu items:
Operation Menu Utility Menu
Calibration Range Calibration
Relay A Setpoint 0-1mA / 0-5Vdc Adjust low
Relay A Deadband 0-1mA / 0-5Vdc Adjust high
Alarm High 4-20 mA Output Adjust Low
Alarm Low 4-20 mA Output Adjust High
7.3 Range Calibration
3.5.1 You may calibrate the range of your instrument by making adjustments to the circuit
board on the swing-out panel. To calibrate the range proceed as follows:
c) Enter the Utility menu as described in 7.2.1.
d) Press CALL to indicate CALIBRATION which is “Range Calibration” in the Utility
Menu. Refer to table in 7.2.2.
e) Rinse the probe and hold it in the air. Adjust potentiometer R52 (zero) [see
diagram] to make the display 2.50
f) Rinse the probe and place it in 500mV buffer. Adjust potentiometer R53 (span)
[see diagram] to make the display read 1.43.
g) Press RUN to return to on line or press CALL to proceed to another item in the
Utility Menu.
f) After returning to on-line, recalibrate as described in Section 5.2.