Aquametrix 2200P pH Analyzer/Controller User Manual - Manual (Page 23)

Model 2200P Page 21
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 MENU to step through the menu items.
Below is the cross-reference between menu items:
Operation Menu Utility Menu
Calibration Range Change
Temperature Temperature Calibration
Output High Temperature Output 100% (5Vdc)
Output Low Temperature Output 0% (0Vdc)
Relay A Relay On 0-1mA / 0-5Vdc Adjust low
Relay A Relay Off 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 Change
7.3.1 The following ranges are offered for the 2200P:
• 0 to 14 pH
• 2 to 12 pH
• 0 to 10 pH
• 4 to 10 pH
7.3.2 You may change the range of your instrument by making adjustments to the circuit
board on the swing-out panel. The analog output limits will change automatically
when you change the range. You may also wish to adjust the range expand at this
time. See Section 5.4. To change the range proceed as follows:
a) Enter the Utility menu as described in 7.2.1.
b) Press MENU until the CALIBRATION LED illuminates which is “Range Change”
in the Utility Menu. See table in 7.2.2.
c) Rinse the probe then place it in a 7 pH buffer. Adjust potentiometer R52 (zero)
[see diagram] to make the display read the value shown in the table below for
the range you have selected.
d) Rinse the probe and place it in either 4 pH buffer or 10 pH buffer. Adjust
potentiometer R53 (span) [see diagram] to make the display read the value
shown in the table below for the buffer and range you have selected.
e) Press RUN to return to on line or press MENU to proceed to another item in the
Utility Menu.
Display reading with probe in buffer: