YSI 550A - Page 8

Page 4 Y S I Environmental YSI 550A
CALIBRATION/STORAGE CHAMBER
The YSI 550A DO Instrument has a convenient
calibration/storage chamber that can be attached to the
instrument’s back. The calibration chamber can be
used from either side of the instrument, by moving the
rubber stopper to either end.
If you look into the chamber, you should notice a small
round sponge in the bottom. Carefully put 3 to 6 drops
of clean water into the sponge. Turn the instrument
over and allow any excess water to drain out of the chamber. The wet sponge creates a 100% water
saturated air environment for the probe. This environment is ideal for dissolved oxygen calibration and
for storage of the probe during transport and non-use.
The YSI 550A DO Instrument’s storage chamber can be conveniently used from either side of the
instrument.
1. Remove the chamber from the
instrument by unscrewing the two
screws.
2. Remove the rubber stopper from
the chamber by pulling the “tail”
free of the small hole on the
chamber.
3. Re-attached the rubber stopper to
the storage chamber by threading
the “tail” through the opposite small hole on the chamber.
4. Re-attached the storage chamber to the instrument using the two screws.
HAND STRAP
The hand strap is designed to allow comfortable operation of the YSI 550A DO Instrument with
minimum effort. If the hand strap is adjusted correctly, it is unlikely that the instrument will be dropped
or bumped from your hand. The hand strap can be conveniently used from either side of the instrument.
To switch the hand strap from one side to the other:
1. Pull the two velcro strips apart.
2. Pull the strap free of the upper and lower hooks.
3. Feed the strap through the hooks on the other side of the instrument.
4. Adjust the strap length so that your hand is snugly held in place.
5. Press the two velcro strips back together.
TAIL
SMALL HOLE
FOR STOPPER’S
TAIL
STOPPER
CALIBRATION CHAMBER