10. Accessories And Replacement Parts .......................................................................18
11. Appendix A - Solubility Table ....................................................................................19
12. Appendix B - Conversion Chart ................................................................................21
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1. General Description
The YSI Model 55 Handheld Dissolved Oxygen System is a rugged, micro-processor based, digital
meter with an attached YSI dissolved oxygen probe.
The YSI Model 55 is designed for field use and is available with cable lengths of 12, 25 or 50 feet.
The body of the probe has been manufactured with stainless steel to add rugged durability and
sinking weight. The large Liquid Crystal Display (LCD) is easy to read and is equipped with a backlight for use in dark or poorly lighted areas.
The Model 55's micro-processor allows the system to be easily calibrated with the press of a few
keys. Additionally, the micro-processor performs a self-diagnostic routine each time the instrument
is turned on. The self-diagnostic routine provides you with useful information about the function of
the instrument circuitry and the quality of the readings you obtain. For a list of these diagnostic
features, see chapter 7 Troubleshooting.
The system simultaneously displays temperature in
(milligrams per liter) or % air saturation. The system requires only a single calibration regardless of
which dissolved oxygen display you use. You can switch back and forth from % air saturation to
mg/L with a single push of the MODE key.
o
C and dissolved oxygen in either mg/L
A calibration chamber is built into the instrument. A small sponge in the chamber can be moistened
to provide a water saturated air environment which is ideal for air calibration. This chamber is also
designed for transporting and storing the probe. When the probe is stored in the chamber, the moist
environment will prolong effective membrane performance and probe life.
The instrument is powered by six AA-size alkaline batteries. A new set of alkaline batteries will
provide approximately 100 hours of continuous operation. When batteries need to be replaced, the
LCD will display a "LO BAT" message.
The YSI Model 55 instrument case is splash resistant. You can operate your Model 55 in a steady
rain without damage to the instrument.
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2. Specifications
Probe Operating Environment
Medium: fresh, sea, or polluted water
Temperature: -5 to +45
o
C
Depth: 0 to 12, 0 to 25 or 0 to 50 feet (depending on cable length)
Meter Ambient Operating/Storage Temperature: -10 to +50
o
C
Material: ABS, Stainless Steel, Acrylic, and other materials.
Range..........................0 to 200 % air saturation
Accuracy ....................± 2 % air saturation
Resolution ..................0.1 % air saturation
Dissolved Oxygen mg/L
Sensor Type................Calculated from % air saturation, temperature and salinity.
Range..........................0 to 20 mg/L
Accuracy ....................± 0.3 mg/L
Resolution ..................0.01 mg/L
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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 800-7654974 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 batterychamber cover in place. The battery-chamber
cover is marked with the words "OPEN" and
"CLOSE."
O-RING
HAND STRAP
POLARITY LABEL
NOTE: On some models, the battery cover
BATTERY CHAMBER LID
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.
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Turn the instrument on by pressing and releasing the ON/OFF button on the front of the instrument.
The instrument will activate all segments of the display for a few seconds, which will be followed by
a self test procedure which will last for several more seconds. During this power on self test
sequence, the instrument’s microprocessor is verifying that the instrument is working. If the
instrument were to detect a problem, a continuous error message would be displayed. If the
instrument does not operate, consult chapter 7 Troubleshooting.
NOTE: The information on the display will be meaningless since the probe has not yet been
prepared.
You may also want to take the instrument into a dark room and, with the instrument ON, hold down
the LIGHT key. The instrument back-light should illuminate the LCD so that the display can be
easily read.
3.4. Calibration/Storage Chamber
The Model 55 has a convenient calibration/storage
chamber built into the instrument’s side. This
chamber provides an ideal storage area for the probe
during transport and extended non-use. 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 which is
ideal for dissolved oxygen calibration.
CALIBRATION CHAMBER
3.5. Hand Strap
The hand strap is designed to allow comfortable operation of the Model 55 with minimum effort. If
the hand strap is adjusted correctly, it is unlikely that the instrument will be easily dropped or
bumped from your hand.
To adjust the hand strap on the back of the meter, unsnap the leather cover and pull the two Velcro
strips apart. Place your hand between the meter and the strap and adjust the strap length so that your
hand is snugly held in place. Press the two Velcro strips back together and snap the leather cover
back into place.
3.6. The Meter Case
The meter case is sealed at the factory and is not intended to be opened, except by authorized service
technicians. Do not attempt to separate the two halves of the meter case as this may damage the instrument, break the water-proof seal, and may void the manufacturer's warranty.
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