YSI 556 MPS - Manual (Page 40)

Section 6 Calibrate
YSI 556 MPS YSI Incorporated Page 34
without displacing a lot of fluid. This also reduces the amount
of liquid that is carried between calibrations.
9. Make certain that port plugs are installed in all ports where
sensors are not installed. It is extremely important to keep
these electrical connectors dry.
6.1.3 Recommended Volumes
Follow these instructions to use the transport/calibration cup for calibration
procedures.
9 Ensure that an o-ring is installed in the o-ring groove of the
transport/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.
9 Remove the probe sensor guard, if it is installed.
9 Remove the o-ring, if installed, from the probe module and
inspect the installed o-ring on the probe module for obvious
defects and, if necessary, replace it with the extra o-ring
supplied.
9 Some calibrations can be accomplished with the probe module
upright or upside down. A separate clamp and stand, such as a
ring stand, is required to support the probe module in the upside
down position.
9 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.
9 When using the Transport/Calibration Cup for dissolved oxygen
% saturation calibration, make certain that the vessel is vented
to the atmosphere by loosening the bottom cap or cup assembly
and that approximately 1/8 inch (3 cm) of water is present in the
cup.