YSI 5000 User manual

YSI MODEL 5000
YSI MODEL 5100
Dissolved Oxygen
Temperature
SERVICE MANUAL

i
TABLE OF CONTENTS
Section 1 General Description..................................................................................................... 1
Section 2 Specifications................................................................................................................ 2
Section 3 Software Flow Chart.................................................................................................... 3
Section 4 Setup.............................................................................................................................. 4
4.1 Display Setup.................................................................................................................... 4
4.2 Report Setup.....................................................................................................................6
4.3 Autostable Setup .............................................................................................................. 7
4.4 System Setup..................................................................................................................... 8
Section 5 Calibration.................................................................................................................. 10
5.1 Dissolved Oxygen Calibration.......................................................................................10
Auto Cal........................................................................................................................... 10
DO Cal (manual).............................................................................................................11
5.2 Barometer....................................................................................................................... 13
5.3 Salinity............................................................................................................................. 13
5.4 Zero Calibration............................................................................................................. 14
Section 6 Diagnostics.................................................................................................................. 15
6.1 History............................................................................................................................. 15
6.2 Sensor.............................................................................................................................. 16
6.3 Reset Ps ........................................................................................................................... 16
Section 7 Troubleshooting Chart .............................................................................................. 17
Section 8 Test Procedure............................................................................................................ 19
Section 9 Maintenance................................................................................................................ 21
9.1 5000 and 5100 Instruments ........................................................................................... 21
Batteries........................................................................................................................... 21
9.2 5910 and 5905 Dissolved Oxygen Probes..................................................................... 22
Electrode Cleaning .........................................................................................................22
Section 10 Software Upgrade Procedure.................................................................................. 23
Section 11 Disassembly/Assembly Procedures......................................................................... 25
Section 12 Circuit Description................................................................................................... 26
Section 13 Schematic Diagrams ................................................................................................30
Section 14 PC Board Layout...................................................................................................... 37
Section 15 PC Board Components............................................................................................ 39
Section 16 Accessories and Replacement Parts ....................................................................... 40
Section 17 Warranty and Repair .............................................................................................. 41

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YSI Incorporated Model 5000/5100 Service Manual 1
SECTION 1 GENERAL DESCRIPTION
MODEL 5000 FEATURES
The Model 5000 is a microprocessor based, menu-driven, dissolved oxygen meter designed to
perform laboratory measurement of dissolved oxygen and Biochemical Oxygen Demand (BOD).
The angled profile makes these instruments both functional and attractive. A large graphical
display provides on-screen menus, and large data fields for ease of operation and readability. The
angle and position of the keypad make operation of the 5000 comfortable. The tactile and audio
response from each key stroke give you the confidence that every command has been received.
The Model 5000 is compatible with all existing YSI dissolved oxygen probes when used with the
YSI Model 5011 adapter. The new YSI Model 5010 self-stirring BOD Probe allows you to
operate the probe from the instrument’s power supply, eliminating the need for a separate power
cable for the probe.
Internal memory for storing up to 100 sets of data, and an RS232 port allow you to upload data
from the Model 5000 directly to your computer. Or you can use your Model 5000 with YSI BOD
Analyst software.
MODEL 5100 FEATURES
The YSI Model 5100 has all of the same functionality of the Model 5000 plus many automated
and application specific features.
The YSI 5100 is the first DO instrument to offer built-in application software for the calculation
of Oxygen Uptake Rate (OUR) and Specific Oxygen Uptake Rate (SOUR). These application
features simplify compliance with USEPA 503 regulations for vector attraction and provide
useful tools for plant operation decisions.
For laboratories with larger volumes, the Model 5100 offers bar code scanner and BOD Analyst
software capability. These tools greatly reduce the labor required for processing BODs and
calculating BOD values. The RS232 serial port makes it easy to capture data electronically.
The model 5000 and 5100 software can be upgraded easily using your computer. When YSI
upgrades these instruments, you’ll be able to get a floppy disk from YSI and simply upgrade the
software in a few minutes.
Calibration of the Model 5100 has been greatly simplified when compared to other dissolved
oxygen instruments. With it’s internal barometer, the Model 5100 is able to automatically
compensate for changes in barometric pressure so there is no need for charts, altitude information
or external barometric pressure information.

YSI Incorporated Model 5000/5100 Service Manual 2
SECTION 2 SPECIFICATIONS
OXYGEN MEASUREMENT
Ranges: mg/L: 0.0 to 60.0 mg/L
% air saturation: 0.0 to 600.0% air saturation
mbar: 0.0 to 1500
Accuracy: mg/L: ±0.1% plus 1 Least Significant Digit (LSD)
% air saturation: ±0.1% plus 1 LSD
mbar: ±1% plus 1 LSD
Resolution: mg/L: 0.1%, or 0.01 mg/L , whichever is greater
% air saturation: 0.1% air saturation
mbar: 1 mbar
TEMPERATURE MEASUREMENT
Range: -5.0 to +50.0°C
Accuracy: ±0.1°C
Resolution: 0.01°C
BAROMETRIC PRESSURE MEASUREMENT
Range: 450 to 825 mmHg (600 to 1100 mbar)
Accuracy: ±1% plus 1 LSD within ±10°C ambient temperature from calibration point
Resolution: 1 mmHg
TEMPERATURE COMPENSATION
The mg/L mode is automatically temperature-compensated to an accuracy of ±1% of DO
readings between 0 and 5°C, and to an accuracy of ±0.6% of readings between 5 and 45°C.
The % air saturation mode is automatically temperature-compensated to an accuracy of ±0.5% of
calibration values between 0 and 5°C, and to an accuracy of ±0.3% of values between 5 and
45°C.
SALINITY COMPENSATION
Range: 0.0 to 40.0 ppt
Accuracy: ±.02 mg/L
OPERATING ENVIRONMENT
0 to 45°C, 10 to 90% relative humidity, non-condensing
WATER RESISTANCE
The Model 5000 and 5100 are designed exclusively for indoor use and are NOT waterproof.
POWER
The Model 5000 & 5100 are powered by an AC adapter or 4 C-size alkaline batteries. A new set
of alkaline batteries will power the selected instrument for approximately 30 hours (not including
stirring).

YSI Incorporated Model 5000/5100 Service Manual 3
SECTION 3 SOFTWARE FLOW CHART
The following section shows the software flow chart for the 5000/5100. The two operating
modes, Main and Application, are shown at the top with the soft-key functions that are accessed
in each mode below them. Functions in shaded boxes are only available on the model 5100.
MAIN
Store
Reveiw
Clear
Send
CALIBRATE
Auto Cal
DO Cal
SETUP
Display
Report
Stable
System
APPLICATION
OUR
SOUR
Remote
Print All
Delete All
Size
Unit
Contrast
Last Digit
SDF
CDF
Range
Next
Audio On/Off
Time/Date
Version
RS-232
Start
Setup
End
Print on/off
Start
Setup
End
Print on/off
Skip
Up
Down
Confirm
DIAGNOSIS
Recall
Print on/off
Print All
Print on/off
Print All

YSI Incorporated Model 5000/5100 Service Manual 4
SECTION 4 SETUP
From Main mode, press the [CALIBRATE] soft-key to enter the calibration menu. Notice that
the dark bar in the top right corner of the display shows the current mode.
98.0 % 8.15 mg/L Calibrate
0.0 ppt 740
mmHg
24.38°C 11:33AM
AUTO CAL DO CAL SETUP DIAGNOSTICS
Next, press the [SETUP] soft-key to enter the Setup menu. The bottom row of the display will
show the following soft-key setup selections.
8.15*
mg
/L
24.38°C 11:33AM
DISPLAY REPORT STABLE SYSTEM
These four selections are used to change the instrument setup.
4.1 DISPLAY SETUP
Press the [DISPLAY] soft-key to show the following menu.
8.15*
mg
/L
24.38°C 11:33AM
SIZE UNITS CONTRAST LAST DIG.
The [SIZE] soft-key cycles among the two possible display arrangements for Main mode. One
selection shows as many parameters as possible, the other shows Dissolved Oxygen in large type
with temperature and time in small type.
Setup
Display

YSI Incorporated Model 5000/5100 Service Manual 5
98.0% 8.15
mg/L Display
0.0 ppt 740
mmHg
24.38°C 11:33AM
SIZE UNITS CONTRAST LAST DIG.
The [UNITS] soft-key changes the display unit(s) of Dissolved Oxygen. When you have selected
a large size display, the DO number cycles among the three possibilities, percent, milligrams per
liter and millibars.
92.2*%
24.38°C 11:33AM
SIZE UNITS CONTRAST LAST DIG.
If the small size display has been selected, the dual DO display cycles among the three
possibilities, percent and milligrams per liter, milligrams per liter and millibars or percent and
millibars. An example is shown below.
8.71 mg/L 208
mbar Display
0.0 ppt 740
mmHg
24.38°C 11:33AM
SIZE UNITS CONTRAST LAST DIG.
The [CONTRAST] soft-key allows the user to change the display contrast. The display contrast
will change slightly each time the [UP] or [DOWN] soft-key is pressed.
The [LAST DIG.] soft-key allows the user to suppress the last digit of the DO reading.
8.2*
mg
/L
24.38°C 11:33AM
SIZE UNITS CONTRAST LAST DIG.
Press the [MODE] key to return to the Setup menu. If you wish to return to Main mode, press
[MODE] two more times.
Display
Display

YSI Incorporated Model 5000/5100 Service Manual 6
4.2 REPORT SETUP
From the Setup menu, press [REPORT] to display the following soft-keys.
[SDF] Space Delimited Format Report
[
*
]
SAMPLE ID #
[
*
]
DATE
[
*
]
DO%
[
*
]
TIME
[
*
]
DO m
g
/L
[
*
]
BAROMETER
[
*
]
TEMPERATURE
[
*
]
SALINITY
PRINT Record from
[
0
]
to
[
99
]
SDF CDF RANGE NEXT
The display lists the parameters that can be included in the output string at the RS232 serial port,
the default set has everything selected for inclusion.
You can select the report format that you wish to use by pressing the [SDF] or [CDF] soft-key.
Select [SDF] for Space Delimited Format (standard text). If you are going to import the data to a
spreadsheet, select [CDF] for Comma Delimited Format.
The asterisk character in front of each parameter indicates that the parameter will be included in
the report. Press the [NEXT] soft-key to select the parameter that you want to change. Then press
[ENTER] to turn the asterisk character on or off.
NOTE: After pressing [SDF] or [CDF] to choose the report format, press the [MODE] key to
exit the Report menu. Do NOT press [ENTER] as this will change the currently selected
parameter.
To return to Main mode, press [MODE] two more times.
The [RANGE] soft-key brings up the following soft-key menu.
[SDF] Space Delimited Format Report
[
*
]
SAMPLE ID #
[
*
]
DATE
[
*
]
DO%
[
*
]
TIME
[
*
]
DO m
g
/L
[
*
]
BAROMETER
[
*
]
TEMPERATURE
[
*
]
SALINITY
PRINT Record from
[
00
]
to
[
99
]
UP DOWN DIGIT NEXT
This menu allows specifying a specific range of memory locations for the report. The default
range is 00 - 99 and empty locations will not be sent to a computer or serial printer.
The display digit that has the flashing cursor below it is increased or decreased by pressing the
[UP] or [DOWN] soft-key. If the [UP] or [DOWN] soft-key is held down, the digit will continue
to change until the key is released. The [DIGIT] soft-key makes it easy to make large changes by
selecting the digit you wish to change. Press the [NEXT] soft-key to change between the
minimum and maximum parameter. When the desired number is obtained, pressing [ENTER]
will accept the number and exit the RANGE sub-menu.
To return to Main mode, press [MODE] three more times.
Flashing Cursor