TPS smartCHEM-D User manual

Congratulations !
The smartCHEM-Dis an advanced, high quality Dissolved Oxygen, Conductivity, TDS and
Temperature meter.
Despite its impressive list of features, the smartCHEM-D is a breeze to operate. This manual has
been designed to help you get started, and also contains some handy application tips. If at any
stage you require assistance, please contact either your local TPS representative or the TPS factory
in Brisbane.
The manual is divided into the following sections:
1. Table of Contents
Each major section of the handbook is clearly listed. Sub-sections have also been included to
enable you to find the information you need at a glance.
2. Introduction
The introduction has a diagram and explanation of the display and controls of the
smartCHEM-D. It also contains a full listing of all of the items that you should have received
with the unit. Please take the time to read this section, as it explains some of items that are
mentioned in subsequent sections.
3. Main Section
The main section of the handbook provides complete details of the smartCHEM-D, including
operating modes, calibration, troubleshooting, specifications, and warranty terms.
4. Appendices
Appendices containing background information and application notes are provided at the back
of this manual.
smartCHEM-D
Dissolved Oxygen,
Conductivity, TDS,
Temperature Meter
Date :20-Aug-2002
Author :KE
Version :1.0

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TPS Pty Ltd
ABN 30 009 773 371
4 Jamberoo Street
Springwood, Brisbane,
Australia, 4127
Phone : [phone]
International : 61 7 32 900 400
Fax : [phone]
International : 61 7 3808 4871
Email : [email protected]
Web : www.tps.com.au

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Contents
1. Introduction ....................................................................................................................................... 5
1.1 smartCHEM-D Display and Controls .......................................................................................... 5
1.2 smartCHEM-D Rear Panel Connectors........................................................................................ 5
1.3 Function and Menu Keys ............................................................................................................ 6
1.4 One-touch Keys .......................................................................................................................... 6
1.5 Numeric Keypad......................................................................................................................... 6
1.6 Delete Key.................................................................................................................................. 6
1.7 240 x 64 Dot Graphic Display..................................................................................................... 6
1.8 Unpacking Information ............................................................................................................... 7
1.9 Specifications.............................................................................................................................. 8
2. smartCHEM-D Menu Structure.........................................................................................................12
3. Dissolved Oxygen Mode ..................................................................................................................13
3.1 Selecting Dissolved Oxygen Mode.............................................................................................13
3.2 Dissolved Oxygen Stirrer...........................................................................................................13
3.3 Dissolved Oxygen Calibration....................................................................................................14
3.4 Dissolved Oxygen Calibration Notes..........................................................................................17
3.5 Dissolved Oxygen Calibration Messages....................................................................................17
4. Conductivity Mode ...........................................................................................................................19
4.1 Selecting Conductivity Mode.....................................................................................................19
4.2 Setting the Conductivity calibration standard..............................................................................19
4.3 Conductivity sensor k factor.......................................................................................................19
4.4 Conductivity Calibration............................................................................................................20
4.5 Conductivity Calibration Notes ..................................................................................................22
4.6 Conductivity Calibration Messages ............................................................................................22
5. TDS Mode..........................................................................................................................................23
5.1 Selecting TDS Mode..................................................................................................................23
5.2 Setting the TDS calibration standard ..........................................................................................23
5.3 TDS sensor k factor....................................................................................................................23
5.4 TDS Calibration.........................................................................................................................24
5.5 TDS Calibration Notes...............................................................................................................26
5.6 TDS Calibration Messages.........................................................................................................26
6. Temperature Mode ...........................................................................................................................27
6.1 Temperature Calibration.............................................................................................................27
6.2 Temperature Calibration Notes...................................................................................................28
6.3 Calibration Messages.................................................................................................................28
7. Auto Stability Function (ASF)..........................................................................................................29
7.1 ASF During Normal Measurement.............................................................................................29
7.2 ASF During Calibration .............................................................................................................29
7.3 ASF with Manual Datalogging...................................................................................................30
7.4 ASF with Automatic Datalogging...............................................................................................31
8. Display Backlight..............................................................................................................................31
9. Good Laboratory Practices (GLP)....................................................................................................32
9.1 To recall GLP information on the display...................................................................................32
9.2 Failed Calibration.......................................................................................................................33
9.3 Printing GLP Information to the RS232 Port ..............................................................................33
9.4 GLP Calibration Alarm..............................................................................................................34
9.5 Instrument Serial Number ..........................................................................................................35
9.6 Additional GLP Features............................................................................................................35
10. Access Code.................................................................................................................................36
10.1 Enabling the Access Code System..............................................................................................36
10.2 Using the Access Code System ..................................................................................................36
10.3 Changing the Access Code.........................................................................................................37
10.4 Disabling the Access Code System.............................................................................................37

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11. Datalogging..................................................................................................................................38
11.1 Manual Datalogging...................................................................................................................38
11.2 Automatic Datalogging..............................................................................................................38
11.3 Recalling Readings from the Logger ..........................................................................................40
11.4 Erasing Records from the Logger...............................................................................................40
11.5 Printing Records from the Logger to the RS232 Port..................................................................41
12. RS232 Port....................................................................................................................................42
12.1 Setting the Baud Rate.................................................................................................................42
12.2 Sending Readings to the RS232 Port..........................................................................................42
12.3 RS232 Configuration .................................................................................................................42
12.4 Communication and Statistical Software....................................................................................42
12.5 Commands.................................................................................................................................43
12.6 Data Format...............................................................................................................................44
12.7 GLP Data Format.......................................................................................................................45
12.8 Importing Data into Microsoft Excel..........................................................................................46
13. Recorder Port...............................................................................................................................48
13.1 Recorder Port Configuration ......................................................................................................48
13.2 Recorder Port Specifications......................................................................................................48
14. Setting the Clock..........................................................................................................................49
15. Initialising the smartCHEM-D.......................................................................................................50
16. Instrument firmware version number..........................................................................................50
17. Troubleshooting...........................................................................................................................51
17.1 General Errors ...........................................................................................................................51
17.2 Dissolved Oxygen Troubleshooting............................................................................................51
17.3 Conductivity / TDS Troubleshooting..........................................................................................52
17.4 Temperature Troubleshooting ....................................................................................................53
18. Appendices...................................................................................................................................54
18.1 Dissolved Oxygen......................................................................................................................54
18.2 Conductivity/TDS......................................................................................................................57
19. Warranty.......................................................................................................................................59

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1. Introduction
1.1 smartCHEM-D Display and Controls
1.2 smartCHEM-D Rear Panel Connectors
Turn the retaining nut clockwise until it clicks into place when plugging in plastic
connectors. This is essential to produce a waterproof seal.
Always replace the waterproof cap when a connector is not in use to maintain
waterproof integrity.

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1.3 Function and Menu Keys
Press to enter the user-friendly menu system. is also used to step backwards through the
menu one level at a time, and as an “escape” key to quit functions such as calibration, data entry etc.
Press the to function keys to select desired options within the menu system.
Additionally, these keys perform the following function directly in normal measurement mode…
:Press to start and stop the optional Dissolved Oxygen stirrer. See section 3.2.2.
:Press to start and stop the Automatic Stability Function. See section 7.
1.4 One-touch Keys
:Press to manually record readings into the Logger. See section 11.1.
:Press to transmit current reading plus date and time to the RS232 port. See section 12.2.
:Press to start and stop Automatic Datalogging. See section 11.2.
:Press to accept default values or those entered on the Numeric Keypad.
1.5 Numeric Keypad
Used to enter values during set-up and calibration. A decimal point is provided.
1.6 Delete Key
Press to make corrections to values entered on the Numeric Keypad.
1.7 240 x 64 Dot Graphic Display
Graphic display with large, clear digits and letters. Features a user-friendly menu and context-
sensitive help system. Shows Dissolved Oxygen, Conductivity/TDS, Temperature, Date and Time
simultaneously.
Backlight can be set to On, Off or Energy Saver modes. See section 8.

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1.8 Unpacking Information
Before using your new smartCHEM-D, please check that the following accessories have been
included:
Part No
Standard Kit…
1. smartCHEM-DDissolved Oxygen, Conductivity, TDS, Temperature Meter...........123104
2. k=1/ATC/Temp Conductivity/TDS Sensor...............................................................122230
3. Temperature/ATC Sensor.........................................................................................121248
4. 2.76 mS/cm Conductivity Standard, 200mL.............................................................122306
5. 2.0 ppK TDS Standard, 200mL................................................................................122307
6. Plug-Pack Power Supply..........................................................................................130037
7. smartCHEM-DHandbook ......................................................................................130050
Optional sensors that may have been ordered with your smartCHEM-D…
1. ED1 Dissolved Oxygen sensor.................................................................................123400
2. 1m Cable for ED1 DO2sensor..................................................................................123228
3. YSI Non-stirring DO2sensor for BOD bottles..........................................................123214
4. YSI Self-stirring DO2sensor for BOD bottles ..........................................................123213
5. YSI Field type DO2sensor .......................................................................................123204
6. 1m Cable for YSI Field DO2sensor..........................................................................123212
7. k=0.1/ATC/Temp Conductivity/TDS Sensor............................................................122232
8. k=10/ATC/Temp Conductivity/TDS Sensor.............................................................122234
Instrument Options…
1. Flexible arm type electrode holder............................................................................130088
2. RS232 Serial Interface Cable....................................................................................130041
3. Recorder Output Option (includes cable)..................................................................130028
4. ...Serial to USB adaptor (must also have 130041 Serial Cable)....................................130087
5. WinTPS RS232 Communication software for ..........................................................130086
Windows 95, 98 and ME
6. Adaptor for 4.5V DC output for Oxygen Stirrers......................................................123311
A complete range of Conductivity/TDS sensors is available from TPS.

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1.9 Specifications
1.9.1 Dissolved Oxygen
Ranges Resolution Accuracy
ED1 Sensor
0 to 20.00 ppM
20.0 to 40.0 ppM 0.01 ppM 0.1 ppM ±0.2% of full scale of selected range
0 to 250.0 % Saturation
250 to 450 % Saturation 0.1 % Saturation 1 % Saturation ±0.3 % Saturation
0 to 50.0 % Gaseous
50 to 100 % Gaseous 0.1 % Gaseous 1 % Gaseous ±0.1 % Gaseous
YSI Sensors
0 to 25.00 ppM
25.0 to 40.0 ppM 0.01 ppM 0.1 ppM ±0.2% of full scale of selected range
0 to 300.0 % Saturation
300 to 450 % Saturation 0.1 % Saturation 1 % Saturation ±0.3 % Saturation
0 to 60.0 % Gaseous
60 to 100 % Gaseous 0.1 % Gaseous 1 % Gaseous ±0.1 % Gaseous
Note : Ranges are automatically selected. Exact auto-ranging points and full scales are subject to
sensor performance.
Sensor Type..........................................Clark type polarographic sensor, with in-built ATC.
Salinity Correction...............................0 to 50.0 ppK, automatic using conductivity/TDS reading.
Temperature Compensation................ Automatic for membrane permeability.
Automatic for Dissolved Oxygen solubility in ppM mode.
Calibration ...........................................Automatic zero and span calibration.
Sensor Span Range............................... 65 to 200 %

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1.9.2 Conductivity
Ranges Resolution Accuracy
k=0.1 Sensor
0 to 2.000 µS/cm
0 to 20.00 µS/cm
0 to 200.0 µS/cm
0 to 2000 µS/cm
0.001 µS/cm
0.01 µS/cm
0.1 µS/cm
1 µS/cm
±0.5% of full scale of
selected range at 25 OC
k=1.0 Sensor
0 to 20.00 µS/cm
0 to 200.0 µS/cm
0 to 2000 µS/cm
0 to 20.00 mS/cm
0.01 µS/cm
0.1 µS/cm
1 µS/cm
0.01 mS/cm
±0.5% of full scale of
selected range at 25 OC
k=10 Sensor
0 to 200.0 µS/cm
0 to 2000 µS/cm
0 to 20.00 mS/cm
0 to 200.0 mS/cm
0.1 µS/cm
1 µS/cm
0.01 mS/cm
0.1 mS/cm
±0.5% of full scale of
selected range at 25 OC
Note : Ranges are automatically selected. Exact auto-ranging points and full scales are subject to
sensor performance.
Sensor Type.......................................... Glass body with two platinised platinum plates.
In-built ATC.
Temperature Compensation................ Automatic, 0 to 100 OC
Calibration ........................................... Automatic zero and span calibration.
Sensor Span Range............................... k=0.1 :k=0.075 to k=0.133
k=1.0 :k=0.75 to k=1.33
k=10 :k=7.5 to k=13.3

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1.9.3 TDS
Ranges Resolution Accuracy
k=0.1 Sensor
0 to 1.000 ppM
0 to 10.00 ppM
0 to 100.0 ppM
0 to 1000 ppM
0.001 ppM
0.01 ppM
0.1 ppM
1 ppM
±0.5% of full scale of
selected range at 25 OC
k=1.0 Sensor
0 to 10.00 ppM
0 to 100.0 ppM
0 to 1000 ppM
0 to 10.00 ppK
0.01 ppM
0.1 ppM
1 ppM
0.01 ppK
±0.5% of full scale of
selected range at 25 OC
k=10 Sensor
0 to 100.0 ppM
0 to 1000 ppM
0 to 10.00 ppK
0 to 100.0 ppK
0.1 ppM
1 ppM
0.01 ppK
0.1 ppK
±0.5% of full scale of
selected range at 25 OC
Note : Ranges are automatically selected. Exact auto-ranging points and full scales are subject to
sensor performance.
Sensor Type..........................................Glass body with two platinised platinum plates.
In-built ATC.
Temperature Compensation................ Automatic, 0 to 100 OC
Calibration ...........................................Automatic zero and span calibration.
Sensor Span Range............................... k=0.1 :k=0.075 to k=0.133
k=1.0 :k=0.75 to k=1.33
k=10 :k=7.5 to k=13.3

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1.9.4 Temperature
Range Resolution Accuracy
-10.0 to 120.0 OC0.1 OC±0.2 OC
Sensor Type.......................................... Silicon transistor
Calibration ........................................... Automatic offset calibration
Sensor Offset Range............................. -10.0 to 10.0 OC
1.9.5 General Specifications
Memory ................................................ 1489 readings including date and time
Automatic Logging............................... User-set for one reading every 2 to 90 seconds, minutes or
hours.
RS232 Port ........................................... 1200, 9600, 19200 & 38400 baud.
8 bits, no parity, 1 stop bit, XON/XOFF Protocol.
Clock..................................................... Calendar clock displays date, month, year, hours, minutes
& seconds.
Good Laboratory Practices.................. Date, time and results of last calibration for all parameters
are stored. This information can be recalled or sent to the
RS232 port at any time.
Power.................................................... 12V DC, 90 mA (backlight off) / 130 mA (backlight on).
AC/DC adaptor to suit country of destination is included
in standard kit.
Dimensions ........................................... 240 x 180 x 105 mm
Mass...................................................... Instrument only :Approx. 1.0 kg
Full Kit :Approx. 3.0 kg
Environment......................................... Temperature :0 to 45 OC
Humidity :0 to 90 % R.H.

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2. smartCHEM-D Menu Structure
A detailed breakdown of the menu system of the smartCHEM-Dis shown below. This diagram
provides a quick reference for the menu functions available for the smartCHEM-D.
→F1:Calibrate →F1:Oxygen
F3:Cond. or TDS
F5:Temp.
→F2:Logger →F1:Recall
F2:Erase →F1:Erase All
F2:Erase Last
F3:Print
F4:Program →F1:Secs
F2:Mins
F3:Hours
→F3:Mode →F1:ppM →
F2:ppM (Sal)
F3:%Sat
F4:%Gas
F5:Cond
F6:TDS
→F4:Setup →F1: Standards →F1:Cond.
F3:TDS
F2:Clock
F3:Backlight →F1:On
F2:Off
F3:Energy Saver
F4: Ports →F1:Baud Rate
F3:Enable Stirrer
or: F3:Disable Stirrer
F5:Recorder*
F5:Initialise →F1:All
→F5:GLP →F1:Recall
F2:Alarm →F1:Daily
F2:1 Week
F3:2 Weeks
F4:4 Weeks
F5:OFF
F3:Print
F6:Access →F1:Change code
F3:Enable & Enter code or F3:Disable Security
* This function only available when Recorder Port option is fitted.

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3. Dissolved Oxygen Mode
3.1 Selecting Dissolved Oxygen Mode
1. Select Mode ( →→ F3:Mode).
2. The Mode readout units selection screen is now displayed…
MODE
>F1:ppM F2:ppM (Sal)
F3:%Sat F4:%Gas
>F5:Cond. F6:TDS
The arrow indicates the current selection.
Press to select Dissolved Oxygen readout in ppM units. This selection will not apply Salinity
correction to the displayed readings.
Press to select Dissolved Oxygen readout in Salinity-corrected ppm units. This selection will
use the Conductivity or TDS reading for automatic Salinity correction.
Press to select Dissolved Oxygen readout in % Saturation units.
Press to select Dissolved Oxygen readout in % Gaseous units.
Press to quit without changing the current setting.
3.2 Dissolved Oxygen Stirrer
The smartCHEM-Dis equipped with a 4.5V DC output to power a stirrer for the Dissolved
Oxygen sensor. This power output is suitable for the YSI self-stirring BOD sensor (part number
123213), or the TPS submersible DO2stirrer (part number 123305).
The 4.5V output is available at the Accessories connector on the rear of the smartCHEM-D.
When using the YSI self-stirring BOD sensor (part number 123213), please use the optional adaptor
cable (part number 123311).
The Control output is capable of supplying 150 mA, which is ample for the two stirrers detailed
above.
3.2.1 Enabling and Disabling the Dissolved Oxygen Stirrer Output
1. Select the Ports menu ( →→ F4:Setup →→ F4:Ports).
2. Select F3:Enable Stirrer or F3:Disable Stirrer from the menu as required.
3.2.2 Starting and Stopping the Dissolved Oxygen Stirrer
1. Ensure that the Dissolved Oxygen stirrer output has been enabled, as per section 3.2.1.
2. Press once in normal display mode to start the stirrer. The stirrer will stay on for 40 seconds
and then stop. A countdown is provided on the screen. The unit will beep every second for the
last five seconds.
3. Press a second time any time during the 40 second period to set the Dissolved Oxygen stirrer
to operate continuously. The stirrer icon plus the word “ON” is shown on the display.
4. Press a third time to stop the Dissolved Oxygen stirrer.
The operator has the choice whether or not to operate the Dissolved Oxygen stirrer during
automatic datalogging. See section 11.2.

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3.3 Dissolved Oxygen Calibration
1. Plug the Dissolved Oxygen sensor into the Oxygen socket.
2. Switch the meter on.
3. Select the Dissolved Oxygen readout mode to be used, as detailed in section 3.1.
4. Ensure that the Temperature readout has been calibrated. When a separate Temperature sensor
is connected, the smartCHEM-D will use it for Automatic Temperature Compensation in the
ppM Dissolved Oxygen modes. When the Temperature sensor is not connected, the
smartCHEM-D will use the Temperature sensor built into the tip of the Dissolved Oxygen
sensor for Automatic Temperature Compensation in the ppM Dissolved Oxygen modes.
It is vital that the correct Temperature sensor is calibrated. See section 6.1 for a detailed
explanation.
5. Rinse the Dissolved Oxygen sensor (and Temperature sensor, if applicable) in distilled water
and blot dry.
3.3.1 Zero Calibration
1. Place the sensor(s) into an oxygen-free solution. This solution may be prepared by dissolving
2g of Sodium Sulphite in 100mL of distilled water. A 50g bottle of Sodium Sulphite powder
(part number 123302) is supplied with a new Dissolved Oxygen sensor for this purpose.
2. Allow the reading to stabilise at or near zero. This may take 2-3 minutes.
3. Select Oxygen Calibration. ( →→ F1:Calibrate →→ F1:Oxygen)
When the reading is below approximately 25 % Saturation, 2 ppM or 5% Gaseous, the
smartCHEM-D will display the ZERO calibration screen…
0*1%S
25.0 OC
Oxygen ZERO Cal.
Press Enter
4. Press to calibrate. The Automatic Stability Function will now show a and highlight any
unstable readings…
0*1%S
25.0 OC
Oxygen ZERO Cal.
Waiting to Stabilise
When the Dissolved Oxygen and Temperature readings have both stabilised, the unit will
calibrate itself.
To calibrate immediately without waiting for complete stability, press to disable the
Automatic Stability Function.
A “∗” will not be removed from the display after a Zero Calibration.
5. Remove the sensor(s) from the Zero solution, rinse well in distilled water and blot dry.
The smartCHEM-D will now prompt you to perform an AIR calibration.

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3.3.2 Span Calibration in Air (all Oxygen modes)
1. Hang the Dissolved Oxygen sensor (and Temperature sensor, if applicable) in air. The tip of the
Dissolved Oxygen sensor should be pointing downwards.
Allow the reading to stabilise. After a zero calibration, this may take up to 5 minutes.
2. Select Oxygen Calibration. ( →→ F1:Calibrate →→ F1:Oxygen)
When the reading is above approximately 25% Saturation, 2 ppM or 5% Gaseous, the
smartCHEM-D will display the AIR calibration screen…
101*0%S
25.0 OC
Oxygen AIR Cal.
Press Enter
3. Press to calibrate. The Automatic Stability Function will now show a and highlight any
unstable readings…
101*0%S
25.0 OC
Oxygen AIR Cal.
Waiting to Stabilise
When the Dissolved Oxygen and Temperature readings have both stabilised, the unit will
calibrate itself.
To calibrate immediately without waiting for complete stability, press to disable the
Automatic Stability Function.
A “∗” in the display will be replaced by a decimal point after a successful air calibration.
4. The smartCHEM-D is now calibrated and is ready for Dissolved Oxygen measurement. Rinse
the Dissolved Oxygen sensor in distilled water and blot dry before placing into unknown
samples.

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3.3.3 Span Calibration in Solution (Salinity-corrected ppM Mode only)
This span calibration provides an alternative to calibrating the Dissolved Oxygen sensor in air. It is
only available when the smartCHEM-D is in Salinity-corrected ppM mode. Please note that the
normal AIR calibration (section 3.3.2) is still available for Salinity-corrected ppM mode.
1. Measure the Dissolved Oxygen content of the solution to be used for calibration. This is
generally done with a Winkler titration. The smartCHEM-Dspan calibration should be
performed immediately the Dissolved Oxygen content of the solution is known, as the value
may not be stable.
2. Place the Dissolved Oxygen and Conductivity/TDS sensors (and Temperature sensor, if
applicable) into the calibration solution. Ensure that the Conductivity/TDS sensor is immersed
at least to the top of the vent hole in the side of the sensor.
The solution must be stirred at a moderate rate.
Allow the reading to stabilise. After a zero calibration, this may take up to 5 minutes.
3. Select Oxygen Calibration. ( →→ F1:Calibrate →→ F1:Oxygen)
When the reading is above approximately 2 ppM, the smartCHEM-D will display the
AIR/SPAN calibration screen. Note the cursor underlining the “A” in “AIR”.
9*00ppMs
25.0 OC
Oxygen AIR/SPAN Cal.
Press Enter
Use the numeric keypad to enter the Dissolved Oxygen value of the solution. The words
“AIR/SPAN” are deleted and the value being entered is displayed. The Conductivity or TDS
reading also appears as soon as the first numeric key is pressed.
Press the to correct any errors.
4. Press to calibrate. The Automatic Stability Function will now show a and highlight any
unstable readings…
6.70ppMs 33.0ppK
25.0 OC
Oxygen Cal.
Waiting to Stabilise
When the Dissolved Oxygen and Temperature readings have both stabilised, the unit will
calibrate itself.
To calibrate immediately without waiting for complete stability, press to disable the
Automatic Stability Function.
A “∗” in the display will be replaced by a decimal point after a successful air calibration.
5. The smartCHEM-D is now calibrated and is ready for Dissolved Oxygen measurement. Rinse
the Dissolved Oxygen sensor in distilled water and blot dry before placing into unknown
samples.

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3.4 Dissolved Oxygen Calibration Notes
1. The relationship of % Saturation and ppM depends on a number of variables, so always
calibrate in the mode required. Do not try to infer Oxygen content from one mode to another.
2. The smartCHEM-D automatically detects if a TPS ED1 or a YSI sensor is connected. When
the unit has been calibrated for one type, and the other type is then connected, the message
“Probe” appears in the Dissolved Oxygen display. It is necessary to re-calibrate for the new
sensor to obtain accurate readings.
3. A zero calibration should be performed at least monthly. In applications where there is a low
level of dissolved oxygen, a zero calibration may have to be done weekly.
4. An air calibration should be performed at least weekly. Of course, more frequent calibration
will result in greater confidence in results.
5. All calibration information is retained in memory when the smartCHEM-D is switched off.
This information can be recalled or printed later using the GLP function (see section 9).
3.5 Dissolved Oxygen Calibration Messages
1. If a Zero calibration has been successfully performed, the smartCHEM-D will display the
following message and the Zero value of the sensor…
Calibration OK,
Zero=0.0%
2. If a Zero calibration has failed, the smartCHEM-D will display the following message and the
failed Zero value of the sensor. The unit will return to normal display mode with a “ ∗∗ ” in
place of the decimal point in the Dissolved Oxygen reading.
Calibration Failed,
Zero=15.0%
3. If an Air/Span calibration has been successfully performed, the smartCHEM-Dwill display
the following message and the Span value of the sensor…
Calibration OK,
Span=101.0%

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4. If an Air/Span calibration has failed, the smartCHEM-D will display the following message
and the failed Span value of the sensor. The decimal point will be replaced by a “ ∗∗ ” when the
unit returns to normal display mode.
Calibration Failed,
Span=205.0%
5. The smartCHEM-D will display the following message if the calibration point is too high. The
unit must be calibrated in the lower of the two ranges that are provided for each Oxygen mode.
Oxygen OvrRange
Not Calibrated
6. The allowable Span range for a Dissolved Oxygen sensor is 65.0 to 200.0 %. If calibration fails
due to the Span value being outside these limits, then please consult the Troubleshooting guide
(section 17.2) for possible remedies.

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4. Conductivity Mode
4.1 Selecting Conductivity Mode
1. Select Mode ( →→ F3:Mode →→ F5:Conductivity).
2. The smartCHEM-D now proceeds to Conductivity measurement mode. Note that a “ ∗∗ ” is
shown in place of the decimal point until a successful calibration has been performed (see
section 4.4).
4.2 Setting the Conductivity calibration standard
The factory default for this item is 2.76mS/cm. If this is satisfactory, go directly to section 4.3.
1. Select the Conductivity Standard entry
(→→ F4:Setup →→ F1:Standards →→ F1:Conductivity.).
The following screen is now displayed…
Conductivity
Standard:2760.uS
Range
20uS/cm to 2000mS/cm
2. Type in the value of the Conductivity standard that is to be used for calibration, including the
decimal point. Use the key to make any corrections.
3. Press to save the value of the standard solution.
Alternatively, press to quit without changing the current setting.
4. The smartCHEM-D will now ask you to enter the units for the Conductivity standard…
Conductivity
Standard:2760
Select Units
F1:uS/cm F2:mS/cm
Press to set the Conductivity Standard as µS/cm.
Press to set the Conductivity Standard as mS/cm.
5. The Conductivity standard is now programmed for use at calibration.
4.3 Conductivity sensor k factor
The smartCHEM-D automatically recognises whether a k=0.1, k=1.0 or k=10 Conductivity sensor
is being used via links in the connector.
Calibration settings for the various k factors are NOT stored separately. The smartCHEM-D
requires re-calibration when a new k factor sensor is connected.
If the smartCHEM-Dhas been calibrated on one k factor sensor and a different k factor sensor is
subsequently connected, the word “Probe” appears instead of the Conductivity reading. In this
case, it is necessary to re-calibrate the Conductivity reading before proceeding.

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4.4 Conductivity Calibration
Before attempting a Conductivity calibration, ensure that the smartCHEM-D has been set up
correctly according to sections 4.1 to 4.3.
Automatic Temperature Compensation is done via a temperature sensor inside the Conductivity
sensor. It is therefore not necessary to calibrate the Temperature readout of the smartCHEM-D
before taking Conductivity measurements.
1. Plug the Conductivity sensor into the Cond / TDS socket.
2. Rinse the Conductivity sensor in distilled water. Shake off as much water as possible. Blot the
outside of the sensor dry. DO NOT BLOT THE ELECTRODE PLATES.
Zero Calibration
3. Let the sensor dry in air.
4. Select Conductivity Calibration ( →→ F1:Calibrate →→ F3:Cond.).
5. The smartCHEM-D will recognise the low conductivity signal and attempt a Zero calibration.
For example…
Cond. 0*01uS
ZERO Calibration
Press Enter
6. Press to calibrate. The Automatic Stability Function will now show a and highlight the
reading while it is unstable…
Cond. 0*01uS
ZERO Calibration
Waiting to Stabilise
When the Conductivity reading has stabilised, the unit will calibrate itself.
To calibrate immediately without waiting for complete stability, press to disable the
Automatic Stability Function.
The “ ∗” will not be removed after a zero calibration.
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