YSI 95 User Manual
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SI MODEL 95
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SI MODEL 95
SI MODEL 95
SI MODEL 95
Handheld
Handheld
HandheldHandheld
Dissolved Oxygen
Dissolved Oxygen
Dissolved OxygenDissolved Oxygen
nd
nd
nd
nd
Temperature System
Temperature System
Temperature SystemTemperature System
Operations
Manual
CONTENTS
CONTENTS
CONTENTSCONTENTS
SECTION 1 INTRODUCTION.........................................................................................................................................1
SECTION 2 PREPARING THE METER ........................................................................................................................2
2.1 U
NPACKING.................................................................................................................................................................2
2.2 W
ARRANTY CARD ......................................................................................................................................................2
2.3 B
ATTERIES ..................................................................................................................................................................2
2.4 C
ALIBRATIO N /S TORAGE CHAMBER ............................................................................................................................3
2.5 H
AND STRAP...............................................................................................................................................................3
2.6 T
HE METER CASE .......................................................................................................................................................3
SECTION 3 PREPARING THE PROBE.........................................................................................................................4
3.1 C
HOOSING THE RIGHT MEMBRANE CAP.....................................................................................................................4
3.2 M
EMBRANE CAP INSTALL A TION.................................................................................................................................4
SECTION 4 OPERATION.................................................................................................................................................6
4.1 T
URNING THE INSTRUMENT ON .................................................................................................................................7
4.2 C
ALIBRATIO N..............................................................................................................................................................7
4.3 M
AKING MEASUREMENTS ..........................................................................................................................................8
4.4 S
TIRRING.....................................................................................................................................................................9
4.5 S
AVING DATA..............................................................................................................................................................9
4.6 R
ECALLING STORED DATA..........................................................................................................................................9
4.7 E
RASIN G STORED DATA............................................................................................................................................10
4.8 T
OGGLING BETWEEN %-AIR SATURATION AND MG/L...............................................................................................11
4.9 D
ISSOLVED OXYGEN FILTER.....................................................................................................................................11
4.10 D
ISPLAY BACKLIGHT ..............................................................................................................................................11
SECTION 5 PRINCIPLES OF OPERATI ON.............................................................................................................12
5.1 MEA C
5.2 DO R
5.3 F
5.4 F
LARK OXYGEN SENSOR ................................................................................................................................12
EADINGS FROM THE CAT HODE REDUCTI ON.....................................................................................................13
ORMATION OF AGCL AT THE ANODE ......................................................................................................................13
UNCTION OF THE EL ECTROLYTE .............................................................................................................................13
SECTION 6 MAINTENANCE OF THE MEA SENSOR...........................................................................................14
6.1 A
NODE SERVICE........................................................................................................................................................14
6.2 C
ATHODE SERVICE....................................................................................................................................................14
6.3 D
ISSOLVED OXYGEN PROBE PRECAUTI ONS.............................................................................................................15
6.4 P
ROBE STORAGE .......................................................................................................................................................15
SECTION 7 DISCUSSION OF MEASUREMENT ERRORS...................................................................................16
SECTION 8 TROUBLESHOOTI NG............................................................................................................................17
SECTION 9 WARRANTY AND REPAIR...................................................................................................................19
APPENDIX A - GENERAL SPECIFICAT I ONS..........................................................................................................24
APPENDIX B - REQUIRED NOTICE...........................................................................................................................26
APPENDIX C - ACCESSORIES AND REPLACEMENT PARTS............................................................................27
APPENDIX D - UNIT CONVERSION...........................................................................................................................28
APPENDIX E - OXYGEN SOLUBILI T Y T ABL E.......................................................................................................29
APPENDIX F - CALIBRATION VALUES TABLE.....................................................................................................31
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SECTION 1
SECTION 1 INTRODUCTION
SECTION 1SECTION 1
The YSI Model 95 Handheld Dissolved Oxygen and Temperature Sy stem is a rugged, microprocessor based, digital meter with an attached YSI m icroelectrode array (MEA) dissolv ed oxygen
probe. The MEA sensor eliminates the need for stirring in most environmental applications
allowing measurement of DO in the field without an external stirring dev ice. I t also reduces
measurement errors caused by insufficient or inconsistent stirring .
The YSI Model 95 has the following features:
• Microprocessor control
• Minimal stirring dependence
• Low maintenance MEA DO probe
• Push-button calibration
• Cap membranes for easy membrane replacement
• Simultaneous display of temperature and DO in % air saturation or mg/L
• Automatic salinity com pensation w ith m anual entering of salinity value
• Automatic temperature com p ensation
• Data storage for 50 sets of readings with on screen recall
• Waterproof case (IP65)
The YSI Model 95 has a non-detachable, combination sensor available with cable lengths of 10, 25,
50 or 100 feet. The Model 95D has a detachable cable. The probe utilizes easy to install cap
membranes and the probe body has been manufactured with stainless steel to add rugged durability
and sinking weight. The silver anode of the MEA DO sensor requires no servicing for up to 10,000
hours (four years) of operation under normal operating conditions (no sulfite contam ination).
INTRODUCTION
INTRODUCTIONINTRODUCTION
The Model 95’s micro-processor allows the system to be easily calibrated with the press of a few
buttons. Additionally, the micro-processor performs a self-diagnostic routine each time the
instrument is turned on. The self-diagnostic routine provides useful information about the function
of the instrument and probe. For a list of these diagnostic codes, see Section 8, Troubleshooting.
A probe calibration/storage chamber is built into the instrument case. A small moist sponge in the
chamber provides a water-saturated air environment that is ideal for air calibration of the dissolved
oxygen probe. This chamber also provides a convenient place to store the probe when the system is
not in use. The Model 95 case is waterproof (rated to IP65) allowing operation in the rain without
damage to the instrument.
Six AA-sized alkaline batteries power the Model 95. A new set of alkaline batteries will provide
approximately 150 hours of continuous operation. When batteries need to be replaced, the LCD will
display a “LO BAT” message.
The YSI Model 95 is designed for use in environmental, aquaculture, and industrial applications
where accurate dissolved oxygen and tem perature measurements are desired with minim al stirring .
YSI Incorporated Model 95 1
SECTION 2
SECTION 2 PREPARING THE METER
SECTION 2SECTION 2
2.1
2.1 UNPACKING
2.12.1
When you unpack your new YSI Model 95 Handheld Dissolv ed Oxy g en and Tem perature Sy stem
for the first time, compare the packing list with the contents of the shipping box. If there is anything
missing or damaged, call the dealer from whom you purchased the Model 95. If y ou do not k now
which 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 y ou.
2.2
2.2 WARRANTY CARD
2.22.2
Please complete the Warranty Card and return it to YSI. The warranty card allows the entry of your
purchase of this instrument in our computer system. Once your purchase is recorded, you will
receive prompt, efficient service if any part of your YSI Model 95 needs repair during the warranty
period.
2.3
2.3 BATTERIES
2.32.3
UNPACKING
UNPACKINGUNPACKING
WARRANTY CARD
WARRANTY CARDWARRANTY CARD
BATTERIES
BATTERIESBATTERIES
PREPARING THE METER
PREPARING THE METERPREPARING THE METER
There are a few things you must do to prepare your YSI Model 95 for use. First, locate the six AAsized alkaline batteries that were included. Use a screwdriver or a small coin to remove the
thumbscrew on the bottom of the instrument (see figure below). This thumbscrew holds the batterychamber cover in place. The battery-chamber cover is marked with the words "OPEN" and
"CLOSE."
NOTE: On some models, the battery cover thumbscrew may be unscrewed by hand (a screwdriver
may not be required).
Battery chamber
cover
Thumb screw
Polarity marking
O-rings
Hand strap
YSI Incorporated Model 95 2
Preparing the Meter Section 2
There is a small molded insert 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.
CAUTION: It is very important that the batteries be installed ONLY as illustrated. The instrument
will not function and may be damaged if the batteries are installed incorrectly.
Turn the instrument on by pressing and releasing the ON/OFF button on the front of the
instrument. The liquid crystal display (LCD) should come on. Allow a few seconds for the
instrument to complete its diagnostic routine. If the instrument does not operate, consult Section 8,
Troubleshooting.
You may also want to take the instrument into a dark room and with the instrument ON, hold down
the LIGHT button. The instrument back light should illuminate the LCD so that the display can be
easily read.
2.4
2.4 CALIBRATION/STORAGE CHAMBER
2.42.4
The Model 95 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 about 10 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 that is ideal for dissolved oxygen
calibration.
CALIBRATION/STORAGE CHAMBER
CALIBRATION/STORAGE CHAMBERCALIBRATION/STORAGE CHAMBER
2.5
2.5 HAND STRAP
2.52.5
The hand strap (see figure on previous page) is designed to allow comfortable operation of the
Model 95 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 vinyl 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 vinyl cover
back into place.
2.6
2.6 METER CASE
2.62.6
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.
YSI Incorporated Model 95 3
HAND STRAP
HAND STRAPHAND STRAP
METER CASE
METER CASEMETER CASE
Figure 1
SECTION 3
SECTION 3 PREPARING THE PROBE
SECTION 3SECTION 3
The YSI Model 95 dissolved oxygen probe is shipped wet with a shipping membrane installed. This
protective membrane cap on the probe tip must be removed and replaced with a new membrane cap
filled with MEA probe solution before using the probe. Follow the instructions below to install the
new membrane cap.
3.1
3.1 CHOOSING THE CORRECT MEMBRANE CAP
3.13.1
Two different membrane caps are available for the Model 95. The YSI Model 9501 Membrane Cap
Kit is supplied with the Model 95. This kit contains six 0.5 mil (.0005") membrane caps and a bottle
of MEA probe solution (KCl).
NOTE: YSI 9501 Membrane Caps offer the fastest response to changes in DO and are
recommended by YSI for most applications.
For conditions with low flow or stagnant water, a 1 mil (.001") mem brane is av ailable (YSI Model
9502 Membrane Cap Kit). This membrane requires less stirring than the 9501, but has a m uch
slower response. Use this membrane when minimal stirring (<2"/sec) is available.
3.2
3.2 MEMBRANE CAP INSTALLATION
3.23.2
CHOOSING THE CORRECT MEMBRANE CAP
CHOOSING THE CORRECT MEMBRANE CAPCHOOSING THE CORRECT MEMBRANE CAP
MEMBRANE CAP INSTALLATION
MEMBRANE CAP INSTALLATIONMEMBRANE CAP INSTALLATION
PREPARING THE PROBE
PREPARING THE PROBEPREPARING THE PROBE
WARNING: Use only YSI MEA probe solution in the m em brane cap. Any other solution will
damage the MEA sensor.
To install a new membrane cap on your YSI Model 95 dissolv ed oxy g en probe:
1. Unscrew and remove the probe sensor guard (see Figure 2 ).
2. Unscrew and remove the old mem brane cap.
3. Thoroughly rinse the sensor tip with distilled water.
4. Hold the membrane cap and add 8 to 9 drops of MEA probe solution (about half full).
5. Tap the bottom of the cap with your finger a few times to remove any trapped air bubbles.
CAUTION: Do not touch the membrane surface.
6. Screw the membrane cap onto the probe tightly by hand (to prevent leakage of electrolyte). A
small amount of probe solution should overflow.
7. Shake off any excess probe solution and rinse the stainless steel thoroughly with distilled water
to prevent corrosion.
YSI Incorporated Model 95 4
Preparing the Probe Section 3
Fill new membrane
cap with 8-9 drops
of MEA probe
solution.
Unscrew guard
Unscrew cap
Tap cap with finger
to remove bubbles.
Screw cap on
tightly by hand
Screw guard on
tightly by hand
Figure 2
WARNING: Use only YSI MEA probe solution in the membrane cap. Any other solution will
damage the MEA sensor.
YSI Incorporated Model 95 5
SECTION 4
SECTION 4 OPERATION
SECTION 4SECTION 4
The following diagram is an overview of the operation of the Model 95. See the following sections
for details of operation.
OPERATION
OPERATIONOPERATION
Figure 3
YSI Incorporated Model 95 6
Operation Section 4
4.1
4.1 TURNING THE
4.14.1
With the batteries installed correctly, press the ON/OFF button. 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 system is working properly. If the instrument were to detect a
problem, a continuous error message would be displayed. See the section entitled Troubleshooting
for a list of error messages.
NOTE: It is normal for an error to be displayed for a second or two when the system is first
4.2
4.2 CALIBRATION
4.24.2
Dissolved oxygen calibration must be done in an environment with a known oxygen content. Since
the amount of oxygen in the atm osphere is k nown, it makes an excellent environment for calibration
(at 100% relative humidity). The calibration/storage chamber contains a moist sponge to create a
100% water saturated air environment.
TURNING THE INSTRUMENT ON
TURNING THE TURNING THE
turned on.
CALIBRATION
CALIBRATIONCALIBRATION
INSTRUMENT ON
INSTRUMENT ONINSTRUMENT ON
Before calibrating the YSI Model 95, complete the procedures discussed in the Preparing the
Meter and Preparing the Probe sections of this manual.
To accurately calibrate the YSI Model 95 you will need to k now the follow ing inform ation:
• The approximate altitude of the region in which you are located.
• The approximate salinity of the samples that you will be measuring. Fresh water has a salinity
of approximately zero. Sea water has a salinity of approximately 35 (parts per thousand, ppt). If
you are not certain what the salinity of the sample water is, use a YSI Model 30 SalinityConductivity-Temperature system to determine it.
1. Ensure that the sponge inside the instrument's
calibration chamber is wet. Insert the probe into the
calibration chamber.
2. Turn the instrument on by pressing the ON/OFF
button. Wait for the dissolved oxygen and
temperature readings to stabilize (usually 15
minutes is required after turning the instrument on).
If the instrument was already on, press the MODE
button until dissolved oxygen is displayed in mg/L
or % air saturation. To enter the calibration menu,
use two fingers to press and release both the UP
ARROW and DOWN ARROW buttons at the
same time (DOWN AR R OW slightly ahead).
Figure 4
YSI Incorporated Model 95 7
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