YSI 600DW-B Sonde - Manual (Page 33)

Sondes Section 2
2.6 GETTING READY TO CALIBRATE
2.6.1 INTRODUCTION
HEALTH AND SAFETY
Reagents that are used to calibrate and check this instrument may be hazardous to your health. Take a
moment to review health and safety information in Appendix A of this manual. Some calibration standard
solutions may require special handling.
PREPARING THE 6572 FREE CHLORINE PROBE FOR CALIBRATION
Before calibration of the free chlorine sensor can be carried out, it needs to be “activated” according to the
following instructions:
• Remove the 6572 free chlorine probe from the sonde bulkhead (if it has been installed previously).
Make certain that a membrane has been installed correctly as documented in Section 2.3 above.
• Prepare a diluted solution of commercial chlorine bleach consisting of 1 part bleach to 200 parts
purified water (distilled or deionized). For example, mix 1 mL of chlorine bleach with 200 mL of
purified water.
• Place the free chlorine probe in the diluted bleach and leave for approximately 60 seconds.
CAUTION: Do not leave the probe in bleach for longer than 1 minute or the break-in time for the
probe will be excessive.
• Rinse the sensor tip and membrane with purified water and set aside in a beaker of tap (NOT deionized
or distilled) water. DO NOT REINSTALL THE PROBE IN THE SONDE BULKHEAD AT THIS
TIME.
Now follow the instructions below for calibration of the other sensors.
CONTAINERS NEEDED TO CALIBRATE A SONDE
The calibration cup that comes with your sonde serves as a calibration chamber for all calibrations except
free chlorine and minimizes the volume of calibration reagents required. However, if you are using the
6026 or 6136 turbidity, the 6025 chlorophyll, or the 6130 rhodamine WT probes, you should visually verify
proper movement of the wiper mechanism before beginning the calibration procedures.
Instead of the calibration cup, you may use laboratory glassware to perform many calibrations. If you do
not use a calibration cup that is designed for the sonde, you are cautioned to do the following:
9 Perform all calibrations with the Probe Guard installed. This protects the probes from possible physical
damage.
9 Use a ring stand and clamp to secure the sonde body to prevent the sonde from falling over. Much
laboratory glassware has convex bottoms.
YSI Incorporated Drinking Water Monitoring Systems Operations Manual 2-26