Xylem 6308DT INDUSTRIAL DISSOLVED OXYGEN TRANSMITTERS User Manual
Page 12
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accurately, you will need the following information:
(a) The approximate pressure (in mbar) of the region in which you plan
to take your dissolved oxygen measurements.
(b) The approximate salinity of the water you will be analyzing. Fresh
water has a salinity of approximately zero. Sea water has a salinity
of approximately 35 parts per thousand (ppt).
f) Calibration Procedures
1. Place 5-6 drops of distilled water into the sponge inside the calibration
bottle. Turn the bottle over and allow any excess water to drain out of the
bottle. The wet sponge creates a 100% water saturated-air environment for
the probe, which is ideal for calibration, transport, and storage of the
Model 6308DT probe.
2. Screw in the bottle into probe allowing at least 5 mm space between the
probe and the sponge.
3. Wait around 30 minutes for the dissolved oxygen and temperature
readings to stabilize. Pressing the [ ] ENTER key will start the
calibration.
4. If you are calibrating in % then the 100% calibration will be displayed. An
error will be displayed if the input is not within the normal DO range. A
[ ] icon will flash, pressing the [ ] ENTER key will start the
calibration. If the input is not within the DO calibration limit then an error
message will be displayed. If all is well then it will save the new
calibration and move to the next page.
5. If you are calibrating in ppm then the current reading in ppm will be
displayed. If you press the [ ] ENTER key, the unit will capture the
current value and then you can change the value by using the [MODE/-],
[ ] UP and [ ] DOWN keys. If you are satisfied with the ppm
value, you need to press the [ ] ENTER key to save the new calibration.
If the DO input is within calibration range then the new calibration will be
saved and move to the next page, otherwise an error message will be
displayed.
6. DO Control Setting
(a) HI RELAY 1 - The action for this relay is fixed to HIGH. In HI-
action, the relay will turn ON if the DO is greater or equal to
RELAY 1 value, which is modified by the hysteresis value and