IOP 019B.0
Effective Date: 1/26/2017
Page 6 of 8
completely saturated and to allow the sensors to stabilize.
3.
Press and hold
Cal
for 3 seconds. Highlight
Dissolved Oxygen
and press enter
to confirm.
4.
The meter will indicate
Calibrating %DO
on the display
5.
The instrument will use the internal barometer during calibration and will
display this value in the bar at the bottom of the display.
6.
Calibration Successful will display for a few seconds to indicate a successful
calibration and then the instrument will return to the Run screen.
7.
If the Calibration is unsuccessful, an error message will display on the screen.
Press the Cal key to exit the error message and to return to the Run screen. See
Troubleshooting section of the user manual for possible solutions.
VII.
Measurements
A.
Ensure the cable and sensors are tightly connected to the meter.
B.
Be sure the meter has been calibrated.
C.
Place the sensors in the sample to be measured.
D.
Shake the probe in the sample to release air bubbles.
E.
Allow temperature reading to stabilize.
F.
Stir the sample water with the probe at a moderate pace. You must provide 6 inches of
water movement per second across the DO sensor membrane to obtain an accurate
reading. Be careful not to create a vortex which allows air bubbles to pass against the DO
membrane.
G.
After at least 5 minutes and once the values stabilize, record the measurement.
IIX.
Sensor storage
A.
Short term storage
The cable assembly is supplied with a sensor storage container, or sleeve, that attaches to
the cable. The container is used for short-term storage (less than 7 days). Be sure to keep
a small amount of moisture (tap water) in the container during storage. This is done to
maintain a 100% saturated air environment which is ideal for short-term sensor storage.
The sensors should not be submersed in water. The intent is to create a humid air storage
environment.
B.
Long term storage
1.
Dissolved oxygen sensor - Dissolved oxygen sensors should be stored in a dry
state for long term storage. First, remove the membrane cap and thoroughly
rinse the sensor with clean water. Next, either blow it dry with compressed air or
allow to air dry completely. Install a clean, dry new membrane cap over the
sensor to keep it dry and to protect the electrodes. After storing the sensor for a
long period of time, it is necessary to “condition” the sensor by putting a new
membrane with electrolyte solution on the sensor and then turning the
instrument on to allow the sensor sufficient time to stabilize.
