YSI Pro20 - Manual (Page 6)

I N T R O D U C T I O N
Thank you for purchasing the YSI Pro20, an instrument from the YSI
Professional
Series
product family. The Pro20 features an impact resistant and waterproof (IP-
67) case, backlit display, user-selectable sensor options, internal barometer, and a
rugged, rubber over-mold case.
The Pro20 provides valuable instructions and prompts near the bottom of the
display that will guide you through operation and use. However, reading the
entire manual is recommended for a better understanding of the Pro20’s features.
The Pro20 can not communicate to a PC via a Pro Plus
communications saddle. Connecting the Pro20 to a
communication saddle may cause erratic instrument behavior.
L
G E T T I N G S T A R T E D
INITIAL INSPECTION
Carefully unpack the instrument and accessories and inspect for damage.
Compare received parts with materials listed on the packing list. If any parts or
materials are missing or damaged, contact YSI Customer Service at 800-897-4151
(+1-937-767-7241) or the Authorized YSI distributor from whom the instrument
was purchased.
BATTERY INSTALLATION
This instrument requires 2 alkaline C-cell batteries. Under normal conditions,
battery life is approximately 400
hours at room temperature without using the
back light. A battery symbol
will blink in the lower, left corner of the
display to indicate low batteries when approximately 1 hour of battery life
remains.
To install or replace the batteries:
1) Turn the instrument off and flip over to view the battery cover on the back.
2) Unscrew the four captive battery cover screws.
3) Remove the battery cover, and remove the old batteries if necessary.
4) Install the new batteries, ensuring correct polarity alignment (Figure 1).
2