YSI 6500 Environmental Process Monitor - Manual (Page 42)

Laboratory and Field Calibration Section 4
6. You do not need to remove the probe guard to rinse and dry the probes
between calibration solutions. The inaccuracy resulting from simply
rinsing the probe compartment and drying the outside of the sonde is
minimal.
7.
For the 600R, 600XL and 600XLM, remove the stainless steel weight
from the bottom of the sonde by turning the weight counterclockwise.
When the weight is removed, the calibration solutions have access to the
sensors while displacing a minimal amount of fluid in the calibration
cup. This also reduces the amount of liquid that is carried between
calibrations.
8. Make certain that port plugs are installed in all ports where probes are
not installed. It is extremely important to keep these electrical
connectors dry.
RECOMMENDED VOLUMES FOR USE WITH THE CALIBRATION CUP
Follow these instructions to use the calibration cup for calibration procedures
‰ Ensure that a gasket is installed in the gasket groove of the calibration cup bottom cap, and
that the bottom cap is securely tightened. Note: Do not over-tighten as this could cause
damage to the threaded portions of the bottom cap and tube.
‰ Remove the probe guard, if it is installed.
‰ Remove the o-ring, if installed, from the sonde.
‰ Inspect the installed gasket on the sonde for obvious defects and if necessary, replace it with
the extra gasket, supplied.
‰ Screw cup assembly into place on the threaded end of sonde and securely tighten. Note: Do
not over tighten as this could cause damage to the threaded portions of the bottom cap and
tube.
‰ Sonde calibration can be accomplished with the sonde upright or upside down. A separate
clamp and stand, such as a ring stand, is required to support the sonde in the inverted
position.
‰ To calibrate, follow the procedures in the next section, Calibration Procedures. The
approximate volumes of the reagents are specified below for both the upright and upside
down orientations.
When using the Transport/Calibration Cup for dissolved oxygen calibration, make certain that the
vessel is vented to the atmosphere by loosening the bottom cap or cup assembly, depending on
orientation, and that approximately 1/8” of water is present in the cup.
Table 1
YSI Incorporated 6500 Environmental Process Monitor 39