Metex 2200C Conductivity Analyzer/Controller - Manual (Page 22)

Model 2200C Page 20
7.3.2 To change the range of your instrument to any range shown above proceed as
described below. (Note that changing the range may require a change of
conductivity cell.)
a) Enter the Utility Menu as described in 7.2.1.
b) Press CALL until the RANGE LED illuminates, which is “Range Change” in the
Utility Menu. See table in 7.2.2.
c) The display will now show the range as currently configured. Use the arrow
buttons until the display shows the desired range. Press ENTER. The display
will flash until ENTER is pressed again to confirm entry.
d) Return to the Operation Menu and press CALL until the CELL CONSTANT LED
illuminates. The display will show the cell constant required by the new range.
You can also check the new range by calling RANGE. If the required cell
constant is other than the one used with the previous range it will be necessary
to purchase a cell with the correct constant.
e) Recalibrate. Refer to Section 5.2.
f) Press RUN to return to on line or press CALL to proceed to another item in the
Utility Menu.
7.4 Temperature Output
7.4.1 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
100°C, (or 32°F to 212°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 until the OUTPUT HIGH LED illuminates, which is “Temperature
output, 100% point” in the Utility Menu (See table in 7.2.2). Use the arrow keys
to make the display read 45.0. Press ENTER. The display will flash until
ENTER is pressed again to confirm entry.
c) Press CALL and the OUTPUT LOW LED will illuminate, which is “Temperature
output, 0% point” in the Utility Menu (See table in 7.2.2). Use the arrow keys 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.
7.5 Adjust 0-1 mA / 0-5 Vdc Output
7.5.1 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. (DMM). Proceed as
follows ignoring the instrument display: