YSI 55 - Manual (Page 7)

3
3. Preparing The Meter
3.1. Unpacking
When you unpack your new YSI Model 55 Handheld Dissolved Oxygen System for the first time,
check the packing list to make sure you have received everything you should have. If there is
anything missing or damaged, call the dealer from whom you purchased the Model 55. If you do not
know which of our authorized dealers sold the system to you, call YSI Customer Service at 800-765-
4974 or 937-767-7241, and we'll be happy to help you.
3.2. Warranty Card
Before you do anything else, please complete the Warranty Card and return it to YSI. This will
record your purchase of this quality instrument in our computer system. Once your purchase is
recorded, you will receive prompt, efficient service in the event any part of your YSI Model 55
should ever need repair.
3.3. Batteries
There are a few things you must do to prepare
your YSI Model 55 for use. First, locate the six
AA-size alkaline batteries which were
included. Use a screwdriver or a small coin to
remove the thumbscrew on the bottom of the
instrument. This thumbscrew holds the battery-
chamber cover in place. The battery-chamber
cover is marked with the words "OPEN" and
"CLOSE."
O-RING
POLARITY LABEL
HAND STRAP
BATTERY CHAMBER LID NOTE: On some models, the battery cover
thumbscrew may be unscrewed by hand (a
screwdriver may not be required).
There is a small label inside each of the two
battery-chamber sleeves. These labels illustrate
the correct way to install the batteries into each
sleeve of the battery-chamber.
NOTE: It is very important that the batteries be installed ONLY as illustrated. The instrument
will not function if the batteries are installed incorrectly.