Aquametrix 2200D Dissolved Oxygen Controller/Analyzer User Manual - Manual (Page 20)

Model 2200D/P91 Page 18
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 RUN LED will flash to warn that Utility Menu is in use. 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
LED display. Press CALL to step through the menu items.
Below is the cross-reference between menu items:
Display LED Meaning in Utility Menu
Output High Temperature Output 100% (5 Vdc)
Output Low Temperature Output 0% (0 Vdc)
%Sat/ppm 0-1 mA / 0-5 Vdc Output Adjust Low
Test 0-1 mA / 0-5 Vdc Output Adjust High
Calibration 4-20 mA Output Adjust Low
Temperature 4-20 mA Output Adjust High
Status Altitude Compensation
7.3 Temperature Output
7.3.1 The 0-5 Vdc and 0-1 mA outputs may be programmed to track the temperature of
the process. The factory outputs have a linear range corresponding to 0°C to 40°C,
(or 32°F to 104°F.) Suppose you wish the output to span 10°C to 45°C. Proceed
as follows:
a) Enter the Utility Menu as described in 7.2.1.
b) Press CALL to indicate OUTPUT HIGH, which is the “Temperature output,
100% point” in the Utility Menu. (See table in 7.2.2). Now use the arrow button
to show 45.0 on the display. Press ENTER. The display will flash until ENTER
is pressed again to confirm entry.
c) Press CALL to indicate OUTPUT LOW, which is the “Temperature output, 0%,
point” in the Utility Menu. (See table in 7.2.2). Now use the arrow buttons to
show 10.0 on the display. Press ENTER twice as above.
d) Press RUN to return to on line or press CALL to proceed to another item in the
Utility Menu.
7.4 Adjust 0-1 mA / 0-5 Vdc Output
7.4.1 It may be desirable to fine tune the 0-1 mA / 0-5 Vdc output to take into account the
characteristics of your particular loop. The following method involves a high and
low calibration and requires the use of a digital multi-meter (DVM). Proceed as
follows ignoring the instrument display:
a) Turn off the power to the instrument. Connect your DVM to the 0-5 Vdc output
terminals on the power supply board.
b) Turn on the power. Enter the Utility Menu as described in 7.2.1.
c) Press CALL to indicate “%sat/ppm”, which is "0-1 mA/ 0-5 Vdc output adjust,
low" in the Utility Menu (See table in 7.2.2). Use the arrow keys to make your
DVM read 1.25V. Press ENTER twice to confirm.
d) Press CALL to indicate TEST, which is "0-1 mA / 0-5 Vdc Output adjust, high" in
the Utility Menu (See table in 7.2.2.) Use the arrow keys to make your DVM
read 3.75V. Press ENTER twice to confirm.