Seametrics DO2 User manual

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DO2DO2
Dissolved Oxygen
Smart Sensor and Datalogger
Instructions

DO2 INSTRUCTIONS
Seametrics • 253.872.0284 Page 3 seametrics.com
Introduction .....................................................................................................................................4
What is the Seametrics DO2 Sensor?...............................................................................................4
Initial Inspection and Handling ..........................................................................................................4
Do’s and Don’ts........................................................................................................................................4
Installation and Operation...........................................................................................................5
Connecting the DO2 to a Computer................................................................................................5
Installing the Aqua4Plus Software ....................................................................................................5
Installing the Sensor...............................................................................................................................6
Real-time Data ..........................................................................................................................................6
Data Logging.............................................................................................................................................7
Reports.........................................................................................................................................................9
Maintenance .................................................................................................................................. 12
Troubleshooting ........................................................................................................................... 13
Erratic Readings..................................................................................................................................... 13
Grounding Issues.................................................................................................................................. 13
Appendix A: Technical Specications................................................................................... 14
Appendix B: Field Calibration ................................................................................................ 16
Appendix C: Reading the Seametrics DO2 Sensor
via Direct Read...................................................................................................................... 17
Reading Via Modbus®......................................................................................................................... 17
Setting Baud Rate................................................................................................................................. 17
Reading Via SDI-12 .............................................................................................................................. 18
Appendix E: Error Code Chart ............................................................................................... 20
Limited Warranty/Disclaimer - Seametrics DO2 Dissolved Oxygen Sensor ........ 23
©1997 - 2016 Seametrics. All rights reserved.
Registered trademarks and trademarks belong to their respective owners.
TABLE OF CONTENTS

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What is the DO2 Sensor?
The Seametrics DO2 Smart Sensor is the next generation in trouble-free oxygen
sensing design. Utilizing uorescence of a stable, immobilized ruthenium-based
lm matrix, the sensor provides precision optical transmission and detection to
measure oxygen concentration in the uid outside of the sensor.
This industry standard digital RS485 interface device records over 250,000 records
of dissolved oxygen, temperature, and power supply voltage data, operates with
low power, and features easy-to-use software with powerful features.
The unit is programmed using the easy-to-use Aqua4Plus control software. Once
programmed the unit will measure and collect data on a variety of time intervals.
The internal microprocessor runs on 12 VDC and automatically turns the sensing
unit on and o, as needed, to conserve power.
Initial Inspection and Handling
Upon receipt of your smart sensor, inspect the shipping package for damage. If
any damage is apparent, note the signs of damage on the appropriate shipping
form. After opening the carton, look for concealed damage, such as a cut cable. If
concealed damage is found, immediately le a claim with the carrier.
Do’s and Don’ts
Do handle the device with care.
Do store the device in a dry, inside area
when not in use.
Do install the device so that the connec-
tor end is kept dry.
Don’t scratch the sensing window.
Don’t support the device with the con-
nector. Use a strain relief device to
take the tension o the connec-
tors.
Don’t allow the device to free-fall down
a well as impact damage can oc-
cur.
Don’t bang or drop the device on hard
objects.
INTRODUCTION

DO2 INSTRUCTIONS
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Connecting the DO2 to a Computer
The DO2 cable is terminated with a weather-resistant connector. Connect the
weather-resistant connector to your computer’s USB port as shown below.
Installing the Aqua4Plus Software
The Seametrics DO2 sensor comes with the Aqua4Plus host software that is installed
on your PC or laptop. Use this software to program the datalogger, to retrieve
data from the logger, to view collected data, and to export data to external les
for use with spreadsheets or databases.
Refer to the Aqua4Plus software manual for details on installing and using
Aqua4Plus.
Using the Sensor Without Aqua4Plus
Most users will use the sensor with Seametics Aqua4Plus software. However, this
sensor is quite versatile, allowing you to do the following:
• Read via the Modbus®protocol using your own software.
• Read via SDI-12 protocol.
• Display readings on a panel meter.
If you want to use one of these methods, see Appendix C or contact Seametrics
for further details.
INSTALLATION AND OPERATION
Cap
Sensor
Cableless
Configuration
PC or Laptop
USB Port
USB to RS485
Adapter
Sensor
Aux. Box
Sensor Cable
Connect the sensor to an auxiliary power supply
then to your PC using USB to RS485 adapter.

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Installing the Sensor
Lower the sensor to the desired depth. Fasten the cable to the well head using tie
wraps or a weather proof strain-relief system. Take a measurement to insure the
sensor is not installed below its maximum range.
Be sure the supplied cap is securely placed on the weather-resistant connector
at the top of the cable. Do not install such that the connector might become
submerged with changing weather conditions. The connector can withstand
incidental splashing but is not designed to be submerged.
INSTALLATION AND OPERATION
Real-time Data
Connect to sensor and select the Real-time data tab
To start real-time readings click Start, readings default to table view. To switch to
Real-time graphing view click the graph icon

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INSTALLATION AND OPERATION
Real-time readings default to a 1 second interval for 1 minute, to adjust enter your
desired settings here:
To save this data to the Reports section click the button located next to the
Single button in the Real-Time tab. This will permanently save this real-time
data set to your Reports database.
Data Logging
Select Set Up Logging from the sensor screen. If there are no les currently on
the sensor you’ll see the Set Up Logging button active under the Data Files tab
as well as in the upper menu. Once les have been started/logged on the sensor
they will be displayed under the Data Files tab.

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INSTALLATION AND OPERATION
Set Up Logging Window
Here you will name your data le and set up the recording interval and duration
of each logging phase. Select your desired recording interval and duration for
each phase, Aqua4Plus 2.0 will display the available memory at the bottom of
the window.

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INSTALLATION AND OPERATION
Reports
Data downloaded from your sensor is stored in the Reports section of
Aqua4Plus 2.0 for viewing and editing. The les will be saved to default data
folder on your PC as well. See Program Settings for default data folder location.
In the main view you’ll see a list of reports sorted by date, size, or le name as
selected here:
You can also search reports by keyword using the search box
Click on a report to bring up the report details.
Reports are displayed in graphing view by default. You can zoom to specic
sections by selecting a section with you mouse or by adjusting the slider below
the graph.

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INSTALLATION AND OPERATION
Click to view data as a table
Click to view data statistics
Click to switch to full screen graphing view
Graph saving and export options are available here:
You may change the display units within the graph view by selecting the
appropriate channel here:

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INSTALLATION AND OPERATION
The Information tab is a new feature allowing users to add metadata to their
reports such as site location, eld notes, or comments. The Schedule tab will
display the logging setup details for the report.
Click Export to export the report as a .csv le or .a4d le for distribution or use
in 3rd party software.
Click Delete to delete the report from Aqua4Plus 2.0
You can also import .a4d les from compatible sensors into Aqua4Plus 2.0 by
clicking at the top of the Reports screen.
A Word About Units
Readings from the Multi-Parameter Sensor can be displayed in various units,
such as degrees Celsius or degrees Fahrenheit for temperature. Select the units
you want from the Sensor Settings button.

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MAINTANANCE
Maintenance
Sensor: There are no user-serviceable parts. If problems develop with sensor
stability or accuracey, contact Seametrics. If the unit has been exposed to hazardous
materials, do not return without notication and authorization.
Cable: Cable can be damaged by abrasion, sharp objects, twisting, crimping,
crushing, or pulling. Take care during installation and use to avoid cable damage.
End Connections: The contact areas (pins & sockets) of the connectors will wear
out with extensive use. If your application requires repeated connections other
types of connectors can be provided. The connectors used by Seametrics are
not submersible, but are designed to be splash-resistant.
DO Window Cleaning: During deployment the sensing window on the DO2 may
collect debris or growth. Heavy debris/growth can aect the accuracy of the DO
readings over time. Periodically check the window and clean if necessary. Note:
the DO window is very sensitive and prone to scratching, DO NOT use abrasive
cleaners. We recommend using a wash bottle and DI water to remove the loose
debris. If there is a stubborn growth over the window you may clean it with a
very soft cloth or Q-tip and a very light touch. Take care not to exert too much
pressure or scratch the window surface during cleaning. A mild detergent may
be used if necessary, such as Alconox. The main body of the unit may be cleaned
with a mild detergent as well.

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TROUBLESHOOTING
Erratic Readings
Erratic readings can be caused by a poor connection, damaged cable, moisture
in the unit, or a damaged transmitter. In most cases, erratic readings are due to
moisture getting into the system.
The rst thing to check is the connection. Look for moisture between contacts
or a loose or broken wire. Next, check the cable for cracking or fraying. If the
connections and cable appear OK, but the readings are still erratic, the transmitter
may be damaged. Contact Seametrics for evaluation and repair. Erratic and
erroneous readings can also occur due to improper grounding. See Grounding
Issues, below.
Grounding Issues
It is commonly known that when using electronic equipment, both personnel and
equipment need to be protected from high power spikes that may be caused by
lightning, power line surges, or faulty equipment. Without a proper grounding system,
a power spike will nd the path of least resistance to earth ground – whether that path
is through sensitive electronic equipment or the person operating the equipment. In
order to ensure safety and prevent equipment damage, a grounding system must be
used to provide a low resistance path to ground.
When using several pieces of interconnected equipment, each of which may have its
own ground, problems with noise, signal interference, and erroneous readings may
be noted. This is caused by a condition known as a Ground Loop. Because of natural
resistance in the earth between the grounding points, current can ow between the
points, creating an unexpected voltage dierence and resulting erroneous readings.
The single most important step in minimizing a ground loop is to tie all equipment
(sensors, dataloggers, external power sources and any other associated equipment)
to a single common grounding point. Seametrics recommends connecting the
shield to ground at the connector end.

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APPENDIX A: TECHNICAL SPECIFICATIONS
The Seametrics DO2 Smart Sensor is a microprocessor based digital intelligent sensor
designed to measure dissolved oxygen, utilizing fluorescence of a stable,
immobilized ruthenium-based lm matrix.
GENERAL
Probe Diameter 1.66” (4.22 cm)
Tube Material Acetal & 316 stainless steel or titanium
Probe Material Epoxy, polyurethane, and PVC
Wire Seal Material Fluoropolymer and PTFE
Submersible Cable Polyurethane, polyethylene,
or ETFE available
Terminating Connector Available
Communication RS485 Modbus® RTU
Direct Modbus Read Output 32-bit IEEE oating point
Internal Math 32-bit oating point
Operating Temp. Range 0° C to 55° C
Storage Temp. Range -40° C to 80° C
LOGGING
Memory 260,000+ records
Log Types Variable, user-dened,
step logarithmic, proled
Programmable Baud Rate 9600, 19200, 38400
Logging Rate 8x/sec maximum
Software Complimentary Aqua4Plus
Networking 32 available addresses per junction
w/batching capabilities (up to 255)
SENSOR
File Formats .xls / .csv / .a4d
Measuring Range 0 - 25 ppm
Accuracy 1% of reading or 0.02 ppm —
whichever is greater
Sensitivity / Resolution 0.01 ppm below 4.00,
0.1 ppm above 4.0
Stability 0.01 ppm
Repeatability 0.01 ppm
Sensor Drift Less than 1% per year
Temperature Range 0° C to 55° C
Response Time 95% in less than 60 seconds
Maximum Pressure 100 PSI

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APPENDIX A: TECHNICAL SPECIFICATIONS
For Modbus®—
with 5-pin connector
For SDI-12 —
with 5-pin connector
For SDI-12 —
without connector
White
Purple
Yellow
Brown
Blue
Shield
12 VDC+ (Vaux)
Modbus D-
Modbus D+
SDI-12 (Not used)
Ground
1
2
3
4
5
5-Pin
Connector
White
Purple
Yellow
Brown
Blue
Shield
12 VDC+ (Vaux)
Modbus D-(Not used)
Modbus D+ (Not used)
SDI-12 Signal
12 VDC – (Gnd)
1
2
3
4
5
5-Pin
Connector
White
Purple
Yellow
Brown
Blue
Shield (may be green)
12 VDC+ (Vaux)
Modbus D-(Not used)
Modbus D+ (Not used)
SDI-12 Signal
12 VDC – (Gnd)
Earth ground
POWER
External Power Pack Required (9-15VDC)
Seametrics Power Pack described below.
Other power options available.
Contact Seametrics for details.
Enclosure Material Polycarbonate (1P67)
Enclosure Dimentions 5.5” x 3.1” x 2.6”
(14 x 7.9 x 6.6 cm)
(excluding connec-
tors)
Power Supply 12VDC (8 AA cells)
Connectors 1 communication
port
1-3 sensor ports
WIRING
Seametrics Power Pack
Calibration can only be done when there are no sessions stored on the sensor. If
there are any sessions stored on the sensor, upload any data you want and then
erase the session before continuing.

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APPENDIX B: FIELD CALIBRATION
DO Calibration
Calibration can only be done when there are no sessions stored on the sensor.
If there are any sessions on the sensor, upload any data you want and then
erase the session before continuing.
Place the DO2 sensor in your reference solution, allow a few minutes for
temperature to stabilize.
Obtain the DO saturation using an alternate method, then select the calibration
button.
Enter the saturation in the reference box, next click Calibrate.
While the DO2 is calibrating you’ll see this:
Once complete close the calibration window and check readings in the real-
time data section.

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Reading Via Modbus®
While the DO2 comes with Seametrics’ easy to use Aqua4Plus software, you can
also use standard Modbus® RTU or SDI-12 equipment to easily take readings, so
as to tie into your existing equipment or networks.
You may need to use Aqua4Plus to set the baud rate. (You do not need to set the
baud rate for SDI-12).
Setting Baud Rate
Your sensor comes congured to communicate at 38,400 baud, with 8 data bits,
one stop bit, and no parity. The sensor can also be set to 19,200 or 9600 baud, if
needed for your application. Change using Sensor Settings.
Taking Measurements
Read measurements using Modbus function 03 – Read Holding Registers.
Readings are located in two registers each, starting at address 62592. (Sensor
register addressing is zero based, i.e., starts at zero. If your equipment uses one
based addressing, you will need to add one to the register addresses.)
Register addresses for DO2 Sensor
Zero Based One Based
Temp (on board) 62592 62593
Pressure 62594 62595
Power 62596 62597
DO 62598 62599
Temp (on probe) 62600 62601
Power On Function
In order to save power, the power to the sensing probe on the DO2 is normally
o, even when the DO2 sensor itself is powered. The sensing probe requires a
warm-up or stabilization time before returning valid readings. The sensing probe
is turned on when a reading is requested or when a Power On command is written
to the DO2.
(Note: If you are recording sessions, reading with Aqua4Plus, or using SDI-12, you do not need
to be concerned with the stabilization period. It is automatically taken care of in these situations.
You only need to be concerned when using your own device to take Modbus readings.)
APPENDIX C: READING THE DO2 VIA DIRECT READ
Data Format
The data is returned as 32-bit IEEE oating-point values, high word rst, also
referred to as big-endian or oat inverse.

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There is a “power on” register on the DO2 (register 62720 or 0xF500). When a
positive value “n” is written to this register, the power is turned on to the sensing
probe and remains on for n/4 seconds. When a reading is requested, the timer
is reset and the sensing element remains on for another n/4 seconds. To force
the power o immediately after a reading, for power savings, write a zero to the
register. If the power to the entire DO2 sensor is turned o, this value defaults to
30 (or 7.5 seconds).
Recommendations to ensure proper warm-up/stabilization and to conserve power:
• Write Power On value of 30 (30/4 = 7.5 seconds)
• Power turns on
• Starts sampling about two times per second
• Wait 7 seconds then request a reading
• Returns most recent sample
• Resets Power On value to 30 (30/4 = 7.5 seconds)
• Write Power On value of 0 (zero)
• Turns power o
• Retains last reading
•
If you Cannot Write to the Power On Register
If you are reading your device using a meter or other device that cannot write the
Power On but simply takes readings on a specied schedule, be sure to set the
polling interval to less than 7.5 seconds. This will ensure that the sensing probe
is always powered up and readings should be fresh and stable. Note that the rst
reading when you turn on the sensor and meter will be old but will refresh within
a second or two.
For further information and detailed Modbus examples, see Seametrics application
note, “Modbus Direct Read on Smart Sensors” available from our web site at
www.seametrics.com.
Reading Via SDI-12
Addressing
Default SDI-12 Address: 0
SDI-12 Command Nomenclature
<a> = Sensor address
{crc} = SDI-12 compatible 3-character CRC
<cr> = ASCII carriage return character
<lf> = ASCII line feed character
highlighted values indicate variable data
SDI-12 Commands
//*** Sensor Identication
<a>I! <a>13 INWUSA SMDO2.01ssssssssss<cr><lf>
APPENDIX C: READING THE DO2 VIA DIRECT READ

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// note: 2.01 will change to reect current
// rmware revision
// ssssssssss = device serial #
//*** Acknowledge Active, Address Query
<a>! <a><cr><lf>
?! <a><cr><lf>
//*** Change Address
<a>A<b>! <b><cr><lf> // change address from <a> to <b>
//*** Request measurement
<a>M! <a>0045<cr><lf> // request all measurements
<a>D0! <a>+23.1374+14.9829+12.1616+3.9829<cr><lf>
// read: temperature (on board),
// pressure
// power
// DO
<a>D1! <a>+19.1374<cr><lf> // read: temperature (on probe)
//*** Request measurement with CRC
<a>MC! <a>0045<cr><lf> // request all measurements w/CRC
<a>D0! <a>+23.1374+14.9829+12.1616+3.9829{crc}<cr><lf>
// read: temperature (on board),
// pressure
// power
// DO
<a>D0! <a>+19.1374{crc}<cr><lf> // read: temperature (on probe)
//*** Concurrent measurement
<a>C! <a>0045<cr><lf> // request all measurements
<a>D0! <a>+23.1374+14.9829+12.1616+3.9829<cr><lf>
// read: temperature (on board),
// pressure
// power
// DO
<a>D0! <a>+19.1374<cr><lf> // read: temperature (on probe)
//*** Concurrent measurement with CRC
<a>CC! <a>0045<cr><lf> // request all measurements w/CRC
<a>D0! <a>+23.1374+14.9829+12.1616+3.9829{crc}<cr><lf>
// read: temperature (on board),
// pressure
// power
// DO
<a>D0! <a>+19.1374{crc}<cr><lf> // read: temperature (on probe)
For further information and SDI-12 examples, see the Seametrics application note, “DO2
Interface Specication (SDI-12 and Modbus)” available from our web site at:
www.seametrics.com
APPENDIX C: READING THE DO2 VIA DIRECT READ

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Any reading over 1000 indicates an error, as detailed in the chart below. To use this
chart, look up the 1000+ reading from your sensor and note the Sensor Error code
in the second column. Then note the Errors 0 – 5. See error descriptions after chart.
Errors
Aqua4Plus Reading Sensor Error Code 5 4 3 2 1 0
1001 01 √
1002 02 √
1003 03 √ √
1004 04 √
1005 05 √ √
1006 06 √ √
1007 07 √ √ √
1008 08 √
1009 09 √ √
1010 10 √ √
1011 11 √ √ √
1012 12 √ √
1013 13 √ √ √
1014 14 √ √ √
1015 15 √ √ √ √
1016 16 √
1017 17 √ √
1018 18 √ √
1019 19 √ √ √
1020 20 √ √
1021 21 √ √ √
1022 22 √ √ √
1023 23 √ √ √ √
1024 24 √ √
1025 25 √ √ √
1026 26 √ √ √
1027 27 √ √ √ √
1028 28 √ √ √
1029 29 √ √ √ √
1030 30 √ √ √ √
Errors
APPENDIX D: ERROR CODE CHART