Aysix Technologies 2000CE User manual

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MODEL 2000CE
PROCESS ANALYZER
MODEL 10
OPTICAL DISSOLVED OXYGEN
SENSOR
MODEL 15/15L
OPTICAL SUSPENDED SOLIDS
SENSOR
REVISION – November 28, 2005
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FAX: [phone]
TEL: [phone]
L5L 3N9 MISSISSAUGA
2595 DUNWIN DR.#2
AYSIX TECHNOLOGIES

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TABLE OF CONTENTS
Product Description..................................................................................3
Packaging...................................................................................................3
INSTALLATION ..........................................................................................4
Analog Outputs..........................................................................................5
Digital Output.............................................................................................5
Relay Outputs.............................................................................................5
OPERATION................................................................................................6
Run Mode....................................................................................................6
Main Menu ..................................................................................................6
Setup Mode.................................................................................................6
Relay............................................................................................................7
Clean Mode.................................................................................................8
Demand Clean............................................................................................8
Analog Output............................................................................................8
Modbus Setup Mode.................................................................................9
SENSOR SETUP......................................................................................10
DO Sensor.................................................................................................10
SS SENSOR CALIBRATION...................................................................12
CH 2 MODE...............................................................................................13
Test Mode.................................................................................................14
ERROR MESSAGES................................................................................16
MAINTENANCE........................................................................................17
GUARANTEE AND REPAIR POLICY.....................................................17
Drawings...................................................................................................18
Appendix A- Modbus Protocol.............................................................A1
Appendix B – CA-2 Jet Clean System................................................. B1

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GENERAL INFORMATION
Product Description
The Model 2000 Process Analyzer is a two channel analyzer designed for the continuous
measurement of dissolved oxygen and/or suspended solids in mixed liquor aeration basins. The
microprocessor-based electronics of the Model 2000 analyzer provide a high degree of flexibility and ease
applications. The DO sensor to be used with this analyzer is an optical type sensor that measures the
fluorescence and quenching reactions of a ruthenium complex that is immobilized in a sol-gel matrix. The
SS sensor operates on the principle of single gap light absorption as a means of detecting the presence of
suspended solids.
The Model 10 Dissolved Oxygen sensor is designed for the continuous monitoring of dissolved
oxygen in water and wastewater where parts per million accuracy is required. The unit will display
dissolved oxygen content in either PPM, mg/l or %SAT. The resolution in PPM and mg/l mode is 0.01
over a range of 0.00 to 3.99 and 0.1 over a range of 4.0 to 20.0. The resolution in %SAT mode is
0.1%SAT over a range of 0.0 to 99.9%SAT and 1%SAT over a range of 100 to 400%SAT. Temperature
is displayed in 0.1 degree Celsius increments over a 0.0 to 50.0 degree Celsius range or 1 degree
Fahrenheit increments over a 32 to 122 degree Fahrenheit range. It incorporates self-cleaning optics via
air or water jet.
The Model 15 TSS sensor has been designed for medium ranges (0 to 30,000 mg/l) as commonly
found in aeration basins of wastewater treatment plants. The Model 15L sensor has been designed for low
ranges (0 to 1500 mg/l) as commonly found in effluent streams. Both sensors utilize an infrared emitter to
minimize color effects and compensates for emitter variations due to temperature by measuring source
brightness. They incorporate self-cleaning optics via air or water jet.
Packaging
The analyzer is housed in a NEMA 4X enclosure (see Drawing IIG01N111 for Outline and Mounting)
and is designed for outdoor mounting. For areas where the environmental temperature is expected to
drop below 14 degrees Fahrenheit (-10 degrees Celsius) for extended periods of time, the optional
automatic heater assembly is recommended.
of use. The instrument is designed to operate with any combination of Aysix sensors in a variety of

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INSTALLATION
1. The Model 2000 analyzer should be located convenient for an operator to read and technician to
install and maintain. A rear rail mounting kit is available for the standard enclosure (see Drawing
IIG01N110). This mounting kit is design for a standard 2” handrail but can be adapted to square
or angle handrails as well.
DO NOT! Locate the analyzer where it is likely to be
damaged during unrelated or other periodic maintenance such
as pressure washing catwalks.
easily mounts to most handrails and slide locks the sensor into place with out the use of tools.
(See drawings IIG02N004, IIG02N005, IIG03N004 and IIG03N005). Again, this sensor mounting
kit is design for a standard 2” handrail but can be adapted to square or angle handrails as well.
WARNING! – Before opening; switch off
the analyzer line power at the circuit breaker to avoid
risk of shock. Line power is present on terminals even
when analyzer is switched off.
WARNING! – Circuit breaker meeting IEC-
947-3 must be on line supply, in close proximity to
equipment and shall be marked as the disconnecting
device for the equipment.
3. Open the enclosure of the Process Analyzer. Pass all connection cables through glands or ½”
conduit in the bottom of the enclosure (gland and conduit are not supplied). The sensor input
connections are made to terminal blocks TB5 (labeled SENSOR 1) and TB7 (labeled SENSOR 2)
(see drawing IIG04R111). The four wires are color coded and there is a cable shield. Connect the
RED wire to the terminal labeled “RED”. Connect the GREEN wire to the terminal labeled “GRN”.
Connect the WHITE wire to the terminal labeled “WHT”. Connect the BLACK wire to the terminal
labeled “BLK”. Connect the cable SHIELD to the terminal labeled “SHLD”. The analog outputs
are available on the terminal block labeled TB1 and the relay outputs are available on the terminal
block labeled TB6.
4. Power Selector Switch: Check switch S4 on the circuit board to be sure that it is set for the type of
power being used (115 volts or 230 volts). Power connections should now be made to the
terminal block labeled TB3. Turn power "on" by using switch S3. Close and secure the enclosure.
5. Switch the circuit breaker on and the unit will now power up.
6. Once the unit is turned on, the unit will initialize and then jump into the "RUN" mode and begin
displaying Channel 1 “CH 1” content on the upper portion of the display and Channel 2 “CH 2”
content on the lower portion of the display.
2. Mount the sensor in the desired location. Aysix can supply a sensor handrail mounting kit that

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Note: The Model 10 D.O. sensor undergoes a
thorough and accurate test and calibration
procedure before shipment from the factory.
Calibration of the D.O. reading at startup is not
necessary and is not recommended.
Analog Outputs
Two isolated 4-20 or 0-20 milliamp signals capable of driving 600 ohms are available from the
terminal block labeled TB1. See drawing IIG04R111 for details. The analog #1 output, for channel #1, is
labeled "I 1" and the analog #2 output, for channel #2, is labeled “I 2”. The common or ground for these
signals are labeled "ICOM”.
Digital Output
A Modbus communications (RS-485) output is available from TB2. This is a three wire signal with a
transmit plus (labeled X+), a transmit minus (labeled X-), and a transmit ground or common (labeled X
COM). See drawing IIG04R111 for details. The RS-485 interface is electrically isolated from the
measurement and microprocessor circuitry of the Model 2000. The communications protocol for the
Digital Output is fully described in Appendix A.
RelayOutputs
There is one independent programmable set point control relay for each channel. These relays are
Form-C with contacts rated 10/6 amps resistive load at 125/250 VAC. Two Form-A relays with contacts
rated 10/6 amps resistive load at 125/250 VAC are used for the jet clean function. The connections for
the relay outputs are available from TB6. See drawing IIG04R111 for connection details.

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OPERATION
Note! – In “Normal Operation” the hinge
cover is to remain tightly screwed closed. Under no
circumstance is it necessary for the operator to open
the enclosure.
Run Mode
The RUN mode is the normal operating mode of the analyzer and is entered upon power-up. When
the Run mode is entered the analyzer will determine what types of sensors are attached to each channel.
The supplied sensors have been calibrated at the factory. The display is continuously updated with the
current measurement values. Also, the analog output and the relays are updated according to the current
conditions and their programmed functions. In the event of an error or alarm condition the display will
indicate the problem in plain English text.
Sensor information for the Model 10 D.O. sensor is stored in non-volatile memory of the sensor.
Sensor information for the Model 15/15L TSS sensor is stored in non-volatile memory of the analyzer. If a
Model 15/15L is connected to the analyzer and the sensor information does not match the information
stored in the analyzer, the analyzer will display a configuration message. The configuration message for
the Model 15/15L TSS sensor is “**Zero sensor**”. These messages will appear whenever the sensor is
changed.
While in the RUN Mode, the time to next scheduled clean cycle can be viewed by pressing and
holding either arrow key. A clean cycle can be demanded by pressing the ENTER key while in the RUN
Mode, see the section on Demand Clean.
Main Menu
The Main Menu is accessed by pressing the “MENU” key while in the RUN mode of operation. There
are three options available from the main menu. Use the arrow keys to switch between RUN, SETUP &
TEST, and then press the "ENTER" key to select.
Setup Mode
This mode of operation allows the user to customize the unit to the specific operation and needs of the
facility. There are a total of five subcategories that may be adjusted.
Operation of the SETUP MODE proceeds as follows:
First, after pressing the "MENU" key, use the “ARROW” keys to move the cursor to the SETUP
option, then press the “ENTER” key. A menu with six options will be displayed. The options are;
RELAYS
ANALOG OUTPUT
MODBUS
SENSOR 1 SETUP
SENSOR 2 SETUP
CH 2 MODE

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Second, use the “ARROW” keys to move the cursor to the desired setup function, then press the
“ENTER” key. The sub-menu for that group will be displayed. Use the “ARROW” keys to move the cursor
to specific item to be changed, then press the “ENTER” key. When the user is finished making the
adjustment, press the “MENU” key to return to the previous page.
Finally, to return to the RUN MODE, press the “MENU” key until the MAIN MENU is displayed. Use
the “ARROW” keys to move the cursor to the run option, then press the “ENTER” key.
Relay
From the setup menu, use the “ARROW” keys to move the cursor to the “1-Relays” option, and then
press the “ENTER” key. There are 11 menu options for configuring the relays.
RELAY 1 OP MODE – defines operation mode of relay 1
RELAY 1 ON SETPOINT – defines when relay 1 will energize
RELAY 1 OFF SETPOINT – defines when relay 1 will de-energize
RELAY 1 FAIL MODE – defines the relay 1 state during an alarm condition
RELAY 2 OP MODE – defines operation mode of relay 2
RELAY 2 ON SETPOINT – defines when relay 2 will energize
RELAY 2 OFF SETPOINT – defines when relay 2 will de-energize
RELAY 2 FAIL MODE – defines the relay 2 state during an alarm condition
RELAY 3 OP MODE – defines operation mode of relay 3.
CLEAN SCHEDULE – defines how often relay four will energize cleaning
CLEAN JET TIME – defines duration of time the clean relays will be energized
CLEAN RECOVERY TIME – defines how many long the reading holds.
The following section is a brief discussion of considerations for configuring the relays 1 and 2.
Note: Do not attempt to adjust relay set points
values until a working sensor has been
connected to the channel. Otherwise, the
analyzer may not display the correct units (TSS
or D.O.) for the channel.
Low Setpoint
If a relay “OP MODE” has been set as a LOW setpoint, then the corresponding relay will energize if
the reading falls below the value set in the “ON SETPOINT” parameter. Once the relay has been
energized by a low reading, it will not be deenergized until the reading rises above the value set in the
“OFF SETPOINT” parameter. The relay “OFF SETPOINT” value MUST be greater than or equal to the
“ON SETPOINT” value in this mode.
High Setpoint
If a relay “OP MODE” has been set as a HIGH setpoint, then the corresponding relay will energize if
the reading rises above the value set in the “ON SETPOINT” parameter. Once the relay has been
energized by a high reading, it will not be deenergized until the reading falls below the value set in the
“OFF SETPOINT” parameter. The relay “OFF SETPOINT” value MUST be less than or equal to the “ON
SETPOINT” value in this mode.

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Relay #3:
Relay 3 has three modes, ALARM, CA2 CLEAN, and SPECIAL.
ALARM MODE: In this mode, the relay is energized for normal operation and will become
deenergized if an error condition occurs. Consequently, loss of power can be sensed remotely as an
alarm condition.
CA2 CLEAN: This mode must be chosen if a model CA2 compressor cleaning assembly is used.
Both relays 3 and 4 are needed to operate this compressor.
SPECIAL: This mode is set if customer supplied air or water is being used with one or two solenoid
valves (see drawing IIG04R113) Or, if a CA1 compressor is being used to clean both sensors. In this
mode the analyzer will energize relay #4 for a clean duration and then de-energize #4 and energize relay
#3 for a clean duration.
Clean Mode
The jet clean system is intended to be connected to relays 4 and/or 3. The relays are connected to
drawing IIG04R113 and IIG04R112 for details.
The CLEAN SCHEDULE program parameter determines how often the jet clean cycle will occur. This
parameter can be set to values of 10 minutes to 24 hrs. Typically, a clean interval of 2 hrs works well for
aeration basins. In colder climates, condensation may form then freeze in the jet-clean tubing. To
prevent this, set the clean interval to 10 or 20 minutes. If this is set to “0” then cleaning is turned off.
The CLEAN JET TIME program parameter determines how long the jet clean cycle will last. The
CLEAN PULSE can be set to values of 1-second to 90-seconds with a 1-second resolution. Typically, a
clean pulse of 30-seconds works well for aeration basins. A clean cycle will consist of the channel 1
sensor being cleaned for the programmed clean jet time immediately followed by the channel 2 sensor
being cleaned for the programmed clean jet time. The analyzer will hold the measurement reading during
the clean cycle and the recovery period which is equal to the programmed clean jet time.
The CLEAN RECOVERY parameter determines how long the analyzer will hold the DO reading after
the cleaning jet time has expired. The default setting is 1 minute which is adequate in most applications.
However, increased recovery time may be required for applications where the sensor is in stagnant water
or dead zones.
Demand Clean
When the analyzer is in the RUN mode pressing the "ENTER" button will cause a clean cycle to begin.
Performing demand clean doesn’t affect the normal clean schedule.
Analog Output
From the SETUP menu, use the ARROW keys to select the “ANALOG OUTPUT” option, then press
the ENTER key. The ANALOG OUTPUT SETUP menu has 8 parameters for configuring these outputs.
ANALOG 1 TYPE – select either 4-20mA or 0-20mA operation for the Analog 1 output.
ANALOG 1 FULL SCALE –defines the value that will cause the Analog 1 output to go to 20mA.
ANALOG 1 MIN SCALE – defines the value that will cause the Analog 1 output to go to 0/4mA.
ANALOG 1 FAIL MODE – defines the value of the Analog 1 output during an alarm or error condition.
Choose between holding the last good reading, 0/4mA, or 20mA.
the Aysix compressor, CA-2, or a customer supplied air or water source and a shut-off valve. See

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ANALOG 2 TYPE – select 4-20mA operation, 0-20mA operation, or 4-20mA output of channel
1’s temperature (only available if channel 1 is a DO sensor) for the
Analog 2 output.
ANALOG 2 FULL SCALE –defines the value that will cause the Analog 2 output to go to 20mA.
ANALOG 2 MIN SCALE – defines the value that will cause the Analog 2 output to go to 0/4mA.
ANALOG 2 FAIL MODE – defines the value of the Analog 2 output during an alarm or error condition.
Choose between holding the last good reading, 0/4mA, or 20mA.
Modbus Setup Mode
From the setup menu, use the “ARROW” keys to select the “MODBUS” option, then press the
“ENTER” key. There are two menu options for configuring the serial digital output.
Comm Address – defines the address of the analyzer
Comm Baud Rate – defines the baud rate of the digital output
Appendix A describes the Modbus protocol implementation in the Model 2000.

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SENSORSETUP
Each channel has its own sensor setup menu. The analyzer will select the appropriate menu for the
type of sensor that is currently connected to each channel.
DO Sensor
General
The Model 10 sensor has been designed to require very infrequent calibration. Unlike polaragraphic
systems, light fouling of the sensing element should not affect the accuracy of the reading, but should only
slow the response time of the system. (However, heavy biological fouling that prevents reasonable sensor
contact with the water will cause erroneous readings.) With the sensor kept reasonably clean, the
calibration should hold for 6 months to 2 years, depending upon conditions.
Note: The Model 10 D.O. sensor undergoes a
thorough and accurate test and calibration
procedure before shipment from the factory.
Calibration of the D.O. reading at startup is not
necessaryand is not recommended.
The Model 2000 analyzer allows the user to select from two different calibration procedures. The
procedure can be selected by choosing SETUP from the main menu. Once the SETUP menu appears,
use the arrow keys to choose the “SENSOR x SETUP” option where x is the channel number of the
desired sensor.
Sensor Calibration to a Reference
Calibration to a known reference is the easiest, simplest, and also the preferred method of calibration
when calibration is required. Calibration option number 1 “Sensor Ref Cal” allows the operator to make
adjustments to the D.O. reading to agree with any other source of D.O. information. THIS CALIBRATION
PROCEDURE MUST ONLY BE USED ON A CLEAN SENSOR. IF THE SENSOR IS READING
ERRONEOUSLY DUE TO HEAVY BIOLOGICAL FOULING, USE OF THIS CALIBRATION METHOD
WILL RESULT IN UNRELIABLE RESULTS. The sensor must be stable in the water to be used as a
reference before beginning this procedure. From the SENSOR SETUP menu, choose the “Sensor Ref
Cal” option, and press ENTER. The analyzer will now read the sensor for the period of time indicated by
the “dampening” parameter, and display the result as D.O. in PPM. If this result matches the reference,
simply press ENTER to exit. Otherwise, use the arrow keys to adjust the reading to match the reference
value, and then press ENTER to store this new value. This procedure is primarily an adjustment to the
offset value of the sensor, but an adjustment in slope will also be made when this procedure is performed.
Sensor Slope Adjustment (NOT RECOMMENDED)
If performed correctly, the previously described “Sensor Calibration to a Reference” should be all that
is required by the user. “Sensor slope adjustment” should only be attempted upon recommendation from
the factory.
Sensor calibration option 2 “Sensor Slope Adj” allows the user to adjust the span of the sensor, but
this procedure must only be used immediately AFTER the sensor has been “zeroed” using calibration
option 1 with the sensor submerged in a zero oxygen solution. This zero solution may be prepared by
adding two tablespoons of sodium sulfite salt to a gallon of tap water in an open container (bucket). The
sodium sulfite salt will remove all oxygen from the water as it dissolves. Stir the water for about one

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minute to dissolve the salt. Submerge the Model 10 sensor in this water and allow it to rest for at least 30
minutes. For best accuracy, the sensor should be resting face down in the bottom of the container. (The
solution stratifies over time at rest, and the dissolved oxygen content will be closest to zero at the bottom
of the container, while slightly above zero nearer the surface.) Also make sure that no air bubbles are
trapped on the face of the sensing element during the soak. Once the sensor is stable, use the “Sensor
Calibration to a Reference” procedure described previously to set the D.O. reading to 0.00 PPM. YOU
MUST ACTUALLY PERFORM THE CAL TO REFERENCE PROCEDURE IN ZERO WATER EVEN IF
THE SENSOR READS ZERO FROM THE RUN MODE. [NOTE: If the user’s application requires a zero
that is absolutely accurate (frequent readings below 0.5 PPM), then the zero solution needed for this
procedure should be mixed 12 to 24 hours before use, and distilled water should be used in place of tap
water. Freshly mixed solution actually has a value of about 0.10 PPM, but a calm solution at rest for 12
hours will drop down very close to absolute zero.]
Once a sensor has been properly zeroed, a slope adjustment may be made. Place the sensor in a
solution of known D.O. concentration, and allow about 15 minutes to fully stabilize. Choose the sensor
slope adjustment calibration procedure as option 2 “Sensor Slope Adj” from the SENSOR SETUP menu,
and press ENTER. Press ENTER again to bypass the “!Warning! Proper Zero Required” message. The
analyzer will now read the sensor for the period of time indicated by the “dampening” parameter, and
display the result as D.O. in PPM. If this result matches the reference, simply press ENTER to exit.
Otherwise, use the arrow keys to adjust the reading to match the reference value, and then press ENTER
to store this new value.
FACTORY DEFAULT
The Factory Default parameter allows the user to restore the sensor characteristic values of zero and
slope to the original factory settings.
TEMP. UNITS
The temperature units parameter allows the user to specify Celsius or Fahrenheit for the displayed
temperature units.
DAMPENING
The dampening parameter will allow the adjustment of the amount of averaging taking place. This is
entered in the amount of time it will take to achieve a stabilized reading, in seconds. This may be useful
when using the system in a new application or trouble shooting.
SALINITY
This option allows for the correction of salts in the water. The salinity correction range is 0 to 45 ppt
with a resolution of 1 ppt.
DISPLAY MODE
This option allows the dissolved oxygen to be displayed in either PPM or %SAT.
PASSCODE
The passcode parameter will allow the operator to limit access to the sensor setup parameters. The
passcode may be set to any three-digit number.

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SS SENSOR CALIBRATION
To do a complete calibration, three steps are required. The analyzer must first be zeroed, and then a
sample/snapshot is taken. After the sample has been analyzed, the span of the analyzer can be adjusted
to the sample. As long as the lenses are kept clean, frequent recalibration should not be necessary.
Every six months should be more than adequate for a complete calibration.
Any optically based device for measuring suspended solids should only be span calibrated against a
typical sample of the actual process water being measured. Synthetic laboratory standards will add
unnecessary inaccuracies to the system and are not recommended. The Model 2000 utilizes its
microprocessor memory in a unique way to make span calibration as easy and accurate as possible. This
calibration is performed as a two step process. First, the SNAPSHOT SAMPLE function of the analyzer is
used to store actual process conditions to the instrument’s memory. Later, when standard laboratory
analysis results are available for those previous conditions, the analyzer’s SPAN function will recall the
stored value and allow the user to adjust the span value accordingly.
The range of operation of the Model 15 sensors is 0-30,000 mg/l total suspended solids. Within this
range, accuracy and repeatability are only specified over a range of +/- 50% of the user’s point of
calibration. Accuracy will be +/- 5% of the current reading or +/- 100 mg/l, whichever is greater.
Repeatability will be +/- 1% of the current reading or +/- 20 mg/l, whichever is greater.
The range of operation of the Model 15L sensor is 0-1500 mg/l total suspended solids. Within this
range, accuracy and repeatability are only specified over a range of +/- 50% of the user’s point of
calibration. Accuracy will be +/- 5% of the current reading or +/- 2 mg/l, whichever is greater. Repeatability
will be +/- 1% of the current reading or +/- 2 mg/l, whichever is greater.
Sensor Zero
Submerge the sensor in clean water. It is important that the water used to zero the sensor be clean.
At the very least use potable water for this, and distilled water is even better. Do not use plant process
water of any type.
Select the "ZERO" option from the calibrate menu using the up and down arrow buttons. Press the
"ENTER" button. With the sensor submerged in clean water, wait about 15 minutes and then press
"ENTER". The analyzer will take about sixty seconds to zero. The display will return to the calibrate menu
automatically when it is finished. Press the "MENU" button to exit or use the up and down arrow buttons
to select another calibration mode.
Snapshot
With the sensor submerged in the process to be measured and stable, select the "SNAPSHOT"
option from the calibrate menu using the up and down arrow buttons. Press the "ENTER" button.
Pressing the "ENTER" button again will cause the analyzer to take a snapshot of the conditions. The
analyzer will take about sixty seconds to obtain a sample value. The display will return to the calibrate
menu automatically when it is finished. At this point, you have NOT altered the calibration of the analyzer
at all; you have only stored the conditions of the process water in memory for future use. Press the
"MENU" button to exit or use the up and down arrow buttons to select another calibration function.
At this time, take a physical sample of the process water from the same location so that it can be
analyzed using standard laboratory techniques to determine suspended solids concentration. This value
will be used during the span calibration.
Sensor Span
This step is performed when an accurate laboratory value has been obtained from the sample
previously taken during the SNAPSHOT procedure. Select the "SENSOR SPAN" option from the calibrate

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menu using the up and down arrow buttons and press the "ENTER" button. The value that was previously
saved snapshot will be displayed. Use the up and down arrow buttons to adjust the analyzer reading to
the value of the laboratory analysis. Press the "Enter" button when done. The system is now calibrated
and ready for normal operation. Press the "MENU" button to exit or use the up and down arrow buttons to
select another calibration mode.
Default Span
This calibration mode will replace the current span calibration value with the factory default value.
This may be useful when using the system in a new application. If the analyzer has been properly zeroed
in clean water, the analyzer will read values that are typical for an average waste treatment plant. No
absolute accuracy is guaranteed after this procedure, but the numbers will, in the least, be useful for
observing trends in the suspended solids concentration over time.
Response Time
The response time parameter will allow the adjustment of the amount of averaging taking place. This
is entered in the amount of time it will take to achieve a stabilized reading, in seconds. This may be useful
when using the system in a new application or trouble shooting.
CH 2 MODE
If the Model 2000 has only one senor connected, you may use this setup option to disable channel 2
completely. This eliminates all channel 2 information from the normal RUN mode display. The options
are ENABLED and DISABLED

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Test Mode
This mode of operation allows the user to perform basic test functions to aid in troubleshooting. There
are a total of 13 tests which may be performed.
Operation of the TEST MODE proceeds as follows. From the Main Menu use the arrow keys to move
the cursor to the TEST option, then press the “ENTER” key. Use the arrow keys to select the desired test,
and then press the “ENTER” key.
View Sensor 1 Data
following channel 1 sensor data is displayed: sensor type, sensor serial number, sensor reporting
mode, and sensor raw data. Press the MENU key to exit.
View Sensor 2 Data
following channel 2 sensor data is displayed: sensor type, sensor serial number, sensor reporting
mode, and sensor raw data. Press the MENU key to exit.
View Sensor Clk
View Sensor Clk displays the power line frequency which is used to filter the sensor data. Press the
MENU key to exit.
Cal Analog 1
Cal analog 1 will cause the analyzer to generate full scale output of 20mA on analog output 1. Use
the UP and DOWN arrows keys to adjust the output, then press the ENTER key to save.
Cal Analog 2
Cal analog 2 will cause the analyzer to generate full scale output of 20mA on analog output 2. Use
the UP and DOWN arrows keys to adjust the output, then press the ENTER key to save.
Test Relay 1
Test Relay 1 displays the current status of relay 1. To toggle relay 1, press the "ENTER" button. The
new status of relay 1 will be displayed. To exit, press the "MENU" key.
Test Relay 2
Test Relay 2 displays the current status of relay 2. To toggle relay 2, press the "ENTER" button. The
new status of relay 2 will be displayed. To exit, press the "MENU" key.
Test Relay 3
Test Relay 3 displays the current status of relay 3. To toggle relay 3, press the "ENTER" button. The
new status of relay 3 will be displayed. To exit, press the "MENU" button.
Clean Relay (Relay #4)
Test Clean Relay displays the current status of relay 4. To toggle relay 4, press the "ENTER" button.
The new status of relay 4 will be displayed. To exit, press the "MENU" button.
This test is intended primarily to aid the Aysix technical support engineers in troubleshooting. The
This test is intended primarily to aid the Aysix technical support engineers in troubleshooting. The

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Test Modbus
Test Modbus will test the RS-485 communication port.
Software Version
Software Version displays the current version of software in the analyzer. To exit, press the "MENU"
button.
View Sensor 1 Char
characteristics for the channel 1 sensor are displayed.
View Sensor 2 Char
characteristics for the channel 2 sensor are displayed.
This test is intended primarily to aid the Aysix technical support engineers in troubleshooting. The
This test is intended primarily to aid the Aysix technical support engineers in troubleshooting. The

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ERROR MESSAGES
During operation, the Model 2000 analyzer may determine that an error condition exists. If this
happens, the display will contain an error message. The 4 possible error messages are as follows:
**SENSOR NOT RESPONDING**
This error message indicates that the analyzer is not receiving any data from the sensor. This could
be caused by either the sensor is not properly connected to the analyzer or a faulty sensor or analyzer
electronics.
*SENSOR ERROR* (Model 10 only)
This error message will be displayed if the sensor’s electronics become faulty. Call the factory for
assistance.
**Zero Sensor** (Model 15/15L only)
The analyzer is indicating that a zero cal operation is required for proper operation. This can occur if a
new or different sensor has been connected to the analyzer. This would be indicated if the current counts
are greater than 5% of the pervious stored zero value.
*Ambient Error* (Model 15/15L only)
This error message will be displayed if the sensor is exposed to too much ambient light (exposed to
direct sunlight) or the sensor LED is faulty. Call the factory for assistance.

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MAINTENANCE
The analyzer does not require any periodic maintenance. However, it may be necessary to
periodically clean the exterior of the analyzer. This may be done with a soft brush, broom or low pressure
water rinse.
DO NOT! use hi-pressure water or a pressure washer to clean the
analyzer. It is likely to be damaged during pressure washing.
The sensor must be kept clean for accurate readings. Normally, the jet clean system will adequately
perform this function.
Model 10 D.O. Sensor: In normal wastewater aeration basins the Model 10 Sensor will not require a
jet clean system; however it is important that the aqueous sample to be measured be allowed to come in
contact with the measuring surface. The sensor should be visually inspected on a monthly basis to insure
that rags and hair have not completely covered the measuring surface. During this time we recommend
rinsing the sensor with a water hose.
In systems with high bio-slim and scaling, the integrated jet clean system is recommended to be used
to prevent the slim and scale from attaching itself to the measuring surface. If wiping the sensing element
is required, use a wet cloth, do not use a brush.
Fouling conditions at wastewater treatment facilities varies considerably from plant to plant.
Experience gained during the first few months of sensor operation will allow the plant operators to
determine their own reasonable schedule of sensor inspection. In no case should this inspection interval
exceed one year.
Model 15/15L TSS Sensor: The sensor must be kept clean for accurate readings. Normally, the jet
clean system will adequately perform this function. However, the sensor should be retrieved and cleaned
manually on a periodic basis to remove the heaviest fouling that may impair the performance of the
sensor. The frequency of this cleaning will vary depending on the application.
GUARANTEE AND REPAIR POLICY
Model 2000 Process Analyzer, Model 10, and Model 15/15L sensors and related items are
guaranteed for two years against defective materials and workmanship. They will be replaced or repaired
the customer.
customer.
Repairs to the equipment not covered by the guarantee will be billed per standard service charges.
Please request service price sheet and/or spare parts price list.
All shipments are insured. If you receive a damaged unit, please notify Aysix so that we may
authorize return of the equipment. Shipments to Aysix should be protected and insured by the
at Aysix discretion free of charge during the guarantee period. Freight to our factory is to be paid by

1
Appendix A- Modbus Protocol
transmission mode. The Modbus protocol defines a message structure that controllers will recognize and
use, regardless of the type of networks over which they communicate. It establishes a common format for
the layout and contents of message fields. Transactions use a master-slave technique, in which only one
device (the master) can initiate transactions (called queries). The other devices (the slaves) respond by
supplying the requested data to the master and by taking the action requested in the query. Insite IG
analyzers operate as slaves to other modbus devices.
Message framing
Messages start with a silent interval of at least 3.5 character times followed by 4 fields and then
followed by another silent interval of at least 3.5 character times. The first field contains the device
address. The second field contains the function code. The third field contains the data. The fourth field
contains the CRC value.
Address field
The address field contains one byte. Valid slave device addresses are in range 1 to 247 decimal.
Function code field
The function code field contains one byte. See the section titled Function codes supported by the
Model 2000.
Data field
The data field contains one or more byte. This information is used by the analyzers to take the action
defined by the function code.
CRC field
The CRC (cyclical redundancy check) field is two bytes, containing a 16-bit binary value. The CRC
value is calculated by the transmitting device, which appends the CRC to the message. The receiving
device recalculates a CRC during receipt of the message, and compares the calculated value to the actual
value it received in the CRC field. If the two values are not equal, the message will be discarded.
The CRC is started by first preloading a 16-bit register to all 1’s. Then a process begins of applying
successive 8-bit bytes of the message to the current contents of the register. During the generation of the
CRC, each 8-bit character is exclusive ORed with the register contents. Then the result is shifted in the
direction of the least significant bit (LSB), with a zero filled into the most significant bit (MSB) position. The
LSB is extracted and examined. If the LSB was a 1, the register is then exclusive ORed with a preset
fixed value. If the LSB was a 0, no exclusive OR takes place.
The process is repeated until eight shifts have been performed. After the last (eight) shift, the next 8-
bit byte is exclusive ORed with the register’s current value, and the process repeats for eight more shifts
as described above. The final contents of the register, after all the bytes of the message have been
applied, is the CRC value.
When the CRC is appended to the message, the low-order byte is appended first, followed by the
high-order byte.
Analyzers support communication with other devices via the Modbus protocol using RTU

2
Function codes supported bythe Model 2000
01 Read Coil Status
Description
Reads the ON/OFF status of the relays in the Model 2000 analyzer.
Query
The query message specifies the starting relay and quantity of relays to be read. Relays are
addressed starting at zero. Relays 1 – 4 are addressed as 0 – 3.
Below is an example of a request to read relays 1 – 4 from Model 2000 with slave address 1.
Field Name Example
Slave Address 01
Function 01
Starting Address Hi 00
Starting Address Lo 00
No. of Relays Hi00
No. of Relays Lo 04
CRC --
The coil status in the response message is packed as one relay per bit of the data field. Status is
indicated as: 1 = ON; 0 = OFF. The LSB of the first data byte contains the relay addressed in the query.
The other relays follow toward the high order end of this byte.
Below is an example of a response to the previous query.
Field Name Example
Slave Address 01
Function 01
Byte Count 01
Data 05
CRC --
The status of relays 1 and 3 is ON and the status of relays 2 and 4 is OFF.

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04 Read Input Registers
Reads the binary contents of input registers in the Model 2000 analyzer.
Query
The query message specifies the starting register address and the quantity of registers to be read.
The Model 2000 input registers are as follows:
Address Register
0000 Channel 1 status
0001 Channel 1 primary measurement
0002 Channel 1 secondary measurement
0003 Channel 2 status
0004 Channel 2 primary measurement
0005 Channel 2 secondary measurement
000A Last 4 digits of the channel 1 sensor serial number
000F Last 4 digits of the channel 2 sensor serial number
The Model 10 sensor will report the channel status as follows:
Status Description
0000 Normal
0001 Sensor not responding
0002 Sensor error
0003 New sensor codes needed
The Model 10 sensor will report D.O. as the primary measurement and temperature as the secondary
measurement. The units for D.O. are hundredths of ppm and the units for temperature are tenths of °C.
The Model 15/15L sensor will report the channel status as follows:
Status Description
0000 Normal
0001 Sensor not responding
0002 Sensor error
0003 Sensor requires a zero calibration
The Model 15/15L sensor will report TSS as the primary measurement and the secondary
measurement is undefined. The units for TSS are mg/l.
Input Registers 6, 7, 8, 9, B, C, D and E are internal calculation values used by the factory for testing.
Below is an example of a request to read the channel 2 status and channel 2 primary measurement
registers from an analyzer with the slave address of 1.
Field Name Example
Slave Address 01
Function 04
Starting Address Hi 00
Starting Address Lo 03
No. of Regs. Hi 00
No. of Regs. Lo 03
CRC --
Below is an example of a response to the previous query where channel 2 is connected to a Model 10
D.O. sensor measuring 8.3 ppm at 25.0°C.
Field Name Example
Slave Address 01
Function 04
Byte Count 06
Data Hi (Reg 3) 00
Data Lo (Reg 3) 00
Data Hi (Reg 4) 03
Data Lo (Reg 4) 3E
Data Hi (Reg 5) 00
Data Lo (Reg 5) FA
CRC --