YSI 6 series Bedienungsanleitung PDF herunterladen (Seite 8)

6. The probe is now ready to be calibrated. Set the Auto Sleep RS-232 for the intended application:

ON for UNATTENDED STUDIES and OFF for SAMPLING MEASUREMENTS. Set the sonde

into the calibration cup with approximately 1/8 inch of water. Do not engage the threads, and do not

allow water to contact the membrane. You may also use the wet-towel method. The sonde must now

sit in this saturated environment for at least 10 minutes before the DO calibration can begin.

Warning: The sonde must be idle and not in the “Run” mode for 5 minutes prior to starting the DO

calibration.

Calibrate the sonde in DO %; be sure to enter your local barometric pressure in mmHg. In

Unattended mode (RS-232 Auto-Sleep ON) the DO probe will be calibrated automatically once the

barometric pressure is entered and the warm-up time counter counts down to zero. For Discrete or

Sampling, press the Enter key when the DO readings are stable. Wait at least 3 minutes after you

enter the barometric pressure before you press the Enter key again to calibrate for Discrete/Sampling

DO measurements.

7. When the calibration is completed, go to the sonde’s Advanced Menu and then to the “Cal

Constants” and record the “DO Gain”. The gain should be 1.0 with a range of 0.7 to 1.4. The probe

is now calibrated and ready to prepare for the study. As with the other parameters, any warning

messages displayed by the sonde during the calibration are a cause for concern and must be

investigated before collecting field data with the sonde.

Warning: Avoid having the DO probe membrane contact the calibration cup or sensor guard during

transfers. Keep the DO probe in sight when removing or installing the sensor guard and cal cup.

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YSI 6 series Bedienungsanleitung Seite 8