Teledyne 4220 - Manual (Page 131)

4220 Flow Meter
Section 5 Options and Accessories
5-23
Note
You must use the Isco Temperature Probe with the D.O. Probe
to provide temperature compensation.
Wrap both the D.O. Probe and Temperature Probe in a damp
cloth. Wait ten minutes for it to stabilize, then proceed.
Go to step 1 on the flow meter. Select PROGRAM, then step
through the units of measure with Enter until you reach the
menu for pH measurement. Select NOT MEASURED. Press
Enter. Then D.O. UNITS will appear. Select either MG/L or
PPM. Press Enter. Exit the program and re-enter going to step
3.
Note that you must select measurement of D.O. in step 1 or the
D.O. menu will not appear in step 3. If you cannot get the D.O.
menu to appear in step 3, recheck your selections in step 1.
Remember that you must select NOT MEASURED for pH in step
1 or D.O. will not appear on the menu for the rest of the program.
Select D.O. Press Enter. This display will appear:
Altitude is just off the screen. You can select D.O. STANDARD if
this calibration medium is available to you. Do not select ABS
(absolute) BAROMETRIC PRESSURE unless you are at sea
level or know how to correct for this value. The barometric
pressure provided from the Weather Bureau is corrected for
altitude. Select ALTITUDE.
Then:
Enter the altitude for your location. This is critical to the probe's
accuracy. The following display will then appear:
The reading is in milligrams of oxygen per liter. If you chose
PPM in program step 1 for D.O. units, the reading would be in
parts per million.
5.11 Installation of
Parameter Probes in
Mounting Rings
The parameter probes are installed in essentially the same way
as the submerged probe level sensor. The probes and their car-
riers snap onto Isco Spring Rings and the base section of Isco
SELECT PARAMETER TO ADJUST
NONE LEVEL D.O.
D.O. CALIBRATION
D.O STANDARD, ABS BAROMETRIC PRESSURE,
ALTITUDE UNITS OF MEASURE
FT, M
ENTER ALTITUDE
ALTITUDE = XXXXX FEET (or meters)
WRAP D.O. PROBE IN MOIST CLOTH
PRESS ENTER WHEN STABLE: X.XXX MG/L