TPS 90-FLMV User manual

Congratulations !
The 90-FLMV is complete water quality logger in a single portable unit. It combines Dissolved
Oxygen, Conductivity, TDS, Salinity, pH, ORP and Temperature.
Despite its impressive list of features, the 90-FLMV 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 90-FLMV. It
also contains a full listing of all of the items that you should have received with 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 90-FLMV, 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.
TPS Pty Ltd
ABN 30 009 773 371
Unit 6 / 253 Leitchs Road
Brendale, QLD,
Australia, 4500
Phone : [phone]
International : 61 7 32 058 027
Fax : [phone]
International : 61 7 3808 4871
Email : [email protected]
Web : www.tps.com.au
90-FLMV
Dissolved Oxygen,
Conductivity, TDS, Salinity,
pH, ORP, Temperature
Logger
Date : 31-Jan-2012
Version : 10.0

2
Contents
1
1. Introduction ............................................................................................................................................. 4
1.1 90-FLMV Display and Controls ...................................................................................................... 4
1.2 90-FLMV Rear Panel Connectors.................................................................................................... 4
1.3 Menu and Function Keys ................................................................................................................. 5
1.4 One-touch Keys................................................................................................................................ 5
1.5 Numeric Keys .................................................................................................................................. 5
1.6 Delete Key........................................................................................................................................ 5
1.7 ON and OFF Keys............................................................................................................................ 5
1.8 80 Character Display........................................................................................................................ 5
1.9 Unpacking Information .................................................................................................................... 6
1.10 Specifications ................................................................................................................................... 8
2. 90-FLMV Menu Structure...................................................................................................................... 10
3. Dissolved Oxygen Mode ...................................................................................................................... 11
3.1 Selecting Dissolved Oxygen Mode................................................................................................ 11
3.2 Dissolved Oxygen Calibration ....................................................................................................... 11
3.3 Dissolved Oxygen Calibration Notes............................................................................................. 13
3.4 Dissolved Oxygen Calibration Messages....................................................................................... 13
3.5 Dissolved Oxygen Stirrer............................................................................................................... 14
4. Conductivity Mode ................................................................................................................................ 15
4.1 Selecting Conductivity Mode......................................................................................................... 15
4.2 Setting the Conductivity calibration standard ................................................................................ 15
4.3 Setting the Conductivity sensor k factor ........................................................................................ 15
4.4 Conductivity Calibration................................................................................................................ 16
4.5 Conductivity Calibration Notes...................................................................................................... 17
4.6 Conductivity Calibration Messages ............................................................................................... 17
5. TDS Mode............................................................................................................................................... 18
5.1 Selecting TDS Mode...................................................................................................................... 18
5.2 Setting the Conductivity sensor k factor ........................................................................................ 18
6. Salinity Mode ......................................................................................................................................... 19
6.1 Selecting Salinity Mode ................................................................................................................. 19
6.2 Setting the Conductivity sensor k factor ........................................................................................ 19
7. pH Mode ................................................................................................................................................. 20
7.1 Selecting the pH Buffer Set............................................................................................................ 20
7.2 pH Calibration................................................................................................................................ 21
7.3 pH Calibration Notes...................................................................................................................... 22
7.4 pH Calibration Messages ............................................................................................................... 23
8. ORP Mode .............................................................................................................................................. 24
8.1 ORP Measurements........................................................................................................................ 24
9. Temperature Mode................................................................................................................................ 25
9.1 Temperature Calibration ................................................................................................................ 25
9.2 Temperature Calibration Notes ...................................................................................................... 26
9.3 Calibration Messages ..................................................................................................................... 26
9.4 Manual Temperature Setting.......................................................................................................... 26
10. Good Laboratory Practices (GLP)................................................................................................... 27
10.1 To recall GLP information on the display...................................................................................... 27
10.2 Failed Calibration........................................................................................................................... 28
10.3 Printing GLP Information to the RS232 Port................................................................................. 28
10.4 Instrument Serial Number .............................................................................................................. 29
10.5 Additional GLP Features................................................................................................................ 29
11. Data logging ...................................................................................................................................... 30

3
11.1 Setting the A & B Data Input Function.......................................................................................... 30
11.2 Manually Recording Readings into the Logger ............................................................................. 30
11.3 Automatic Data logging ................................................................................................................. 33
11.4 Recalling Readings from the Logger ............................................................................................. 36
11.5 Erasing Records from the Logger .................................................................................................. 37
11.6 Printing Records from the Logger to the RS232 Port .................................................................... 37
12. RS232 Port......................................................................................................................................... 38
12.1 Setting the Baud Rate..................................................................................................................... 38
12.2 Sending Readings to the RS232 Port ............................................................................................. 38
12.3 RS232 Configuration ..................................................................................................................... 38
12.4 Communication and Statistical Software ....................................................................................... 38
12.5 Commands ..................................................................................................................................... 38
12.6 Data Format.................................................................................................................................... 40
12.7 GLP Data Format ........................................................................................................................... 41
12.8 Importing Data into Microsoft Excel ............................................................................................. 42
13. Setting the Clock .............................................................................................................................. 44
14. Initialising the 90-FLMV ................................................................................................................... 45
15. Instrument firmware version number ............................................................................................. 45
16. Battery Saver Function .................................................................................................................... 46
17. Moisture Protection .......................................................................................................................... 47
17.1 Silica Gel Pack ............................................................................................................................... 47
18. Troubleshooting ............................................................................................................................... 48
18.1 General Errors ................................................................................................................................ 48
18.2 Dissolved Oxygen Troubleshooting............................................................................................... 49
18.3 Conductivity/TDS/Salinity Troubleshooting ................................................................................. 50
18.4 pH and ORP Troubleshooting........................................................................................................ 51
18.5 Temperature Troubleshooting........................................................................................................ 52
19. Appendices ....................................................................................................................................... 53
19.1 Dissolved Oxygen .......................................................................................................................... 53
19.2 Conductivity/TDS/Salinity............................................................................................................. 56
19.3 pH................................................................................................................................................... 58
20. Warranty ............................................................................................................................................ 60

4
1. Introduction
1.1 90-FLMV Display and Controls
1.2 90-FLMV Rear Panel Connectors

5
1.3 Menu and Function Keys
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 3.5.
: Press to start automatic data logging in the Sampling Period and Duration mode. See
section 11.3.2.
1.4 One-touch Keys
: Press to obtain context-sensitive help messages. This function is disabled within menus.
: Press to record readings into the Logger. See section 11.
: Press to transmit current reading plus date and time to the RS232 port. See section 12.2.
: Press the key to accept default values or those entered on the Numeric Keypad.
1.5 Numeric Keys
Used to enter values during set-up and calibration. A negative sign and decimal point are provided.
1.6 Delete Key
Press the key to make corrections to values entered on the Numeric Keypad.
1.7 ON and OFF Keys
Press the relevant key to switch the 90-FLMV on and off as required.
1.8 80 Character Display
80 character alphanumeric display with user-friendly menu and context-sensitive help system.
Shows Dissolved Oxygen, Conductivity/TDS/Salinity, pH, ORP, Temperature, Date and Time
simultaneously.

6
1.9 Unpacking Information
Before using your new 90-FLMV , please check that the following accessories have been included:
Part No
5 metre bundle 130018/5:
90-FLMV including 5m cables & sensors.......... ................................... 130018/5
5 metre Option Includes
Submersible pH, sensor, 5m cable.......................................................... 111224
ORP, Submersible, 5m........................... ................................................ 111259
k=1 Conductivity/TDS/Salinity Temperature Sensor, 5m...................... 122196
YSI 5739 Dissolved Oxygen Sensor (no cable).... ................................. 123204
5m cable for sensor................................................................................. 123219
pH7.00 Buffer, 200mL........................... ................................................ 121387
pH4.01 Buffer, 200mL........................... ................................................ 121381
2.76mS/cm Conductivity Standard, 200mL....... .................................... 122306
ORP Standard, 100mL each of Part A and B....... .................................. 121309
Battery Charger....................................................................................... 130009
Same Price Interchange Option:
k=10 Conductivity/TDS/Salinity Temperature Sensor, 5m.................... 122218
k=0.1 Conductivity/TDS/Salinity Temperature Sensor, 5m................... 122197
Options and Accessories
Sensor Upgrade: difficult samples such as meat, dairy, slurries...
pH , Intermediate Junc, 5m...................... ............................................... 121200/5
ORP , Intermediate Junc, 5m..................... ............................................. 121260/5
Dissolved Oxygen Field Stirrer:
YSI 5739 Dissolved Oxygen Sensor Stirrer........................................... 123306
Dissolved Oxygen Sensor Maintenance:
YSI5739 Field Sensor & Non Stirring BOD Sensor
Membrane & filling solution kit............................................................. 123300
Filling Solution only, 45mL.................... ............................................... 123303
Zero calibration Sodium Sulphite........................................................... 123302
Rejuvenation kit...................................................................................... 123037
Diaphragm replacement kit...................... .............................................. 123304
(Above for YSI5739 Field Sensor Only)
Temperature Sensor:
Temperature Sensor, 5m cable................... ............................................ 124210
Sensor Holders:
Sensor holder for 90FL & 90FL-MV, 5m cable..................................... 121343
Computer Interface:
RS232 serial port cable to connect to computer. .................................... 130015
Serial to USB adaptor cable (used with 130015).................................... 130087
WinTPS Software for Windows.................... ........................................ 130086
Power options:
12V Solar charging panel....................... ................................................ 130012

7
12V Car cigarette lighter lead................................................................. 130013
Clip lead for external 12V battery............. ............................................. 130024
Carry case:
Waterproof carry case............................................................................. 130058

8
1.10 Specifications
Ranges Resolution Accuracy
Oxygen
0 to 30.00 ppM
0 to 300.0 % Sat
0 to 60.0 % Gas
0.01 ppM
0.1 % Sat
0.1 % Gas
±0.02 ppM
±0.2 % Saturation
±0.1 % Gaseous
Conductivity
k=0.1 cell 0 to 2.000 µS/cm
0 to 20.00 µS/cm
0 to 200.0 µS/cm
0 to 2000 µS/cm
k=1 cell 0 to 20.00 µS/cm
0 to 200.0 µS/cm
0 to 2000 µS/cm
0 to 20.00 mS/cm
k=10 cell 0 to 200.0 µS/cm
0 to 2000 µS/cm
0 to 20.00 mS/cm
0 to 200.0 mS/cm
0.001 µS/cm
0.01 µS/cm
0.1 µS/cm
1 µS/cm
0.01 µS/cm
0.1 µS/cm
1 µS/cm
0.01 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
O
C
TDS
k=0.1 cell 0 to 1.000 ppM
0 to 10.00 ppM
0 to 100.0 ppM
0 to 1000 ppM
k=1 cell 0 to 10.00 ppM
0 to 100.0 ppM
0 to 1000 ppM
0 to 10.00 ppK
k=10 cell 0 to 100.0 ppM
0 to 1000 ppM
0 to 10.00 ppK
0 to 100.0 ppK
0.001 ppM
0.01 ppM
1 ppM
0.01 ppK
0.01 ppM
0.1 ppM
1 ppM
0.01 ppK
0.1 ppM
1 ppM
0.01 ppK
0.1 ppK
±0.5% of full
scale of selected
range at 25
O
C
Salinity
k=0.1 cell 0 to 0.10 %
0 to 1.0 PSU
k=1 cell 0 to 1.19 %
0 to 11.9 PSU
k=10 cell 0 to 8.00 %
0 to 80.0 PSU
0.01 %
0.1 PSU
±0.5% of full
scale of selected
range at 25
O
C
pH
0 to 14.00 pH 0.01 pH ±0.01 pH
ORP
0 to ±2000 mV 1 mV ±1 mV
Temperature
-10.0 to 110.0
O
C
(Cond sensor limit 60
O
C)
0.1
O
C ±0.2
O
C
Additional Oxygen Specifications
Sensor Type .......................................Clark type polarographic sensor with in-built ATC.
Salinity Correction for ppM ...............0 to 50.0 ppK, automatic using Conductivity 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 %

9
Additional Conductivity/TDS/Salinity Specifications
Temperature Compensation................Automatic, -5 to 70.0 OC
Conductivity Sensor Span Range .......75 to 133 %
Auto Standard Recognition ................Conductivity: 20uS/cm to 200mS/cm user selected
TDS Factor ........................................0.40 to 1.00, user selected
Additional pH Specifications
Temperature Compensation................Automatic, -5 to 100.0 OC
pH Input Impedance...........................>3 x 1012 Ω
pH Asymmetry Range........................-1.00 to 1.00 pH
pH Slope Range .................................85.0 to 105.0%
Auto pH Buffer Recognition ..............pH4.01, pH6.86, pH7.00, pH9.18, pH10.01
Any other can be entered during calibration.
Additional mV Specifications
ORP Input Impedance........................>3 x 1012 Ω
Additional Temperature Specifications
Temperature Sensor Offset Range......-10.0oC to +10.0oC
1.10.1 General Specifications
Memory ................................................ 7230 readings including date and time with A&B function
disabled.
5950 readings including date and time with A&B function
enabled.
Automatic Logging ............................... Rate per Day
1 to 288 readings per day.
Sampling Period and Duration
One reading every 1 to 300 seconds for a duration of 1 to
720 minutes or continuous.
RS232 Port ........................................... 300, 9600 & 19200 baud.
8 bits, no parity, 1 stop bit, XON/XOFF Protocol.
Clock ..................................................... Calendar clock displays date, month, hours, minutes &
seconds. Year is Y2K compliant and is attached to all
stored data.
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 .................................................... 7.2V, 1300mAH NiCad battery built in.
Battery charger for country of destination is included.
Solar panel and external battery clip lead optionally
available.
Battery Saver ........................................ Auto switch-off after 5 minutes or 1 hour. Battery saver
can be switched off to allow continuous use.
Dimensions ........................................... 230 x 140 x 100 mm
Mass ...................................................... Instrument only : Approx. 1.5 kg
Full Kit : Approx. 5.0 kg
Environment ......................................... Temperature : 0 to 45 OC
Humidity : 0 to 90 % R.H.

10
2. 90-FLMV Menu Structure
A detailed breakdown of the menu system of the 90-FLMV is shown below. This diagram provides
a quick reference for the menu functions available for the 90-FLMV .
→
F1:Calibrate → F1:Oxygen
F2:Conductivity
F3:pH
F4:Temperature
→
F2:Mode
→
F1:Oxygen
→
F1:ppm
F2:ppM (Sal)
F3:%Sat
F4:%Gas
F2:Conductivity
F3:TDS
F4:Salinity
→ F3:Logger → F1:Recall
F2:Erase
→
F1:Erase All
F2:Erase Last
F3:Print Log
F4:Start
or:
F4:Stop
F5:Program
→
F1:Rate per Day
F3:Sampling Period
and Duration
→ F4:Setup → F1:Standards → F1:Conductivity
F3:pH Buffers
F2:GLP → F1:Recall
F3:Print
F4:Initialise Meter
F3:Set AB
→
F1:A=Pond,No B
F2:A=Pond,B=Data
F3:A=Data,NoB
F4:A&B=Data
F5:OFF
F4:k factor * → F1:k=.1 *
F2:k=1 *
F5:System
→
F1:Bat. Saver
→
F1:OFF
F2:5 minutes
F3:1 hour
F2:Set Clock
F3:Baud Rate → F1:300
F2:9600
F3:19200
F4:Stirrer Enable
or: F4:Stirrer Disable
* This function not available when a TPS k=10 sensor is connected.

11
3. Dissolved Oxygen Mode
3.1 Selecting Dissolved Oxygen Mode
1. Select Dissolved Mode ( →
→→
→F2:Mode →
→→
→F1:Oxygen ).
2. The Dissolved Oxygen readout units selection screen is now displayed…
MODE F1:ppm F2:ppM (Sal)
>F3:% Sat F4:% Gas
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 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 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 (see section 9.1) or manually set (see
section 9.4).
5. Rinse the Dissolved Oxygen sensor in distilled water and blot dry.
3.2.1 Zero Calibration (all Oxygen modes)
1. Place the Dissolved Oxygen sensor 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 or
Membrane Kit 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
90-FLMV will display the ZERO calibration screen…
1*0%Sat 25.0
o
c
Oxygen ZERO Calibration, Press Enter
4. Press to calibrate.
A “ ∗ ” will not be removed from the display after a Zero Calibration.
5. Remove the sensor from the Zero solution, rinse well in distilled water and blot dry.
The 90-FLMV will now prompt you to perform an AIR calibration.

12
3.2.2 Span Calibration in Air (all Oxygen modes)
1. Hang the Dissolved Oxygen sensor 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
90-FLMV will display the AIR calibration screen…
101.0%Sat 25.0
o
c
Oxygen AIR Calibration, Press Enter
Press to calibrate.
A “ ∗ ” in the display will be replaced by a decimal point after a successful air calibration.
3. The 90-FLMV is now calibrated and is ready for Dissolved Oxygen measurements. Rinse the
Dissolved Oxygen sensor in distilled water and blot dry before placing it into unknown
samples.
3.2.3 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 90-FLMV is in Salinity-corrected ppM mode. Please note that the normal
AIR calibration (section 3.2.2) 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 90-FLMV span 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 sensors into the calibration solution. Ensure that
the Conductivity sensor is calibrated and is correctly immersed (see section 4.4).
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 90-FLMV will display the AIR/SPAN
calibration screen. Note the cursor underlining the “ A ” in “ Air ”.
9.10ppM 25.0
o
c
Oxygen AIR/SPAN Calibration, 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 or
Salinity reading also appears as soon as the first numeric key is pressed.
Press the to correct any errors.
Ensure that the Dissolved Oxygen, Conductivity or TDS or Salinity, and Temperature readings
are fully stable.
Press to calibrate.
A “ ∗ ” in the display will be replaced by a decimal point after a successful air calibration.
4. The 90-FLMV is now calibrated and is ready for Dissolved Oxygen measurements. Rinse the
Dissolved Oxygen sensor in distilled water and blot dry before placing it into unknown
samples.

13
3.3 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. 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.
3. An air calibration should be performed at least weekly. Of course, more frequent calibration
will result in greater confidence in results.
4. All calibration information is retained in memory when the 90-FLMV is switched off. This
information can be recalled or printed later using the GLP function (see section 10).
3.4 Dissolved Oxygen Calibration Messages
1. If a Zero calibration has been successfully performed, the 90-FLMV will display the following
message and the Zero value of the sensor…
0.0%Sat 25.0
o
c
Calibration OK, Zero=0.5%
2. If a Zero calibration has failed, the 90-FLMV 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.
15.0%Sat 25.0
o
c
Calibration Failed, Zero=15.0%
3. If an Air/Span calibration has been successfully performed, the 90-FLMV will display the
following message and the Span value of the sensor…
100.0%Sat 25.0
o
c
Calibration OK, Span=100.0%
4. If an Air/Span calibration has failed, the 90-FLMV 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.
205.0%Sat 25.0
o
c
Calibration Failed, Span=205.0%
5. 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 18.2) for possible remedies.

14
3.5 Dissolved Oxygen Stirrer
The 90-FLMV is equipped with a 4.5V DC output to power a stirrer for the Dissolved Oxygen
sensor. This power output is suitable for the TPS submersible DO2stirrer (part number 123306).
3.5.1 Enabling and Disabling the Dissolved Oxygen stirrer output
1. Select the System menu ( →
→→
→F5:System ).
2. Select F4:Stirrer Enable or F4:Stirrer Disable from the menu as required.
3.5.2 Connecting the Dissolved Oxygen stirrer
To connect the Dissolved Oxygen stirrer…
1. Plug the Dissolved Oxygen stirrer into the Oxygen socket on the meter.
2. Plug the Dissolved Oxygen sensor into the in-line socket that is provided on the stirrer cable.
Please refer to the diagram below.
3.5.3 Starting and Stopping the Dissolved Oxygen stirrer
1. Ensure that the Dissolved Oxygen stirrer output has been enabled, as per section 3.5.1.
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.
3. Press a second time any time during the 40 second period to set the Dissolved Oxygen
stirrer to operate continuously.
4. Press a third time to stop the Dissolved Oxygen stirrer.
The Dissolved Oxygen stirrer starts and stops automatically when the 90-FLMV is in Rate per Day
automatic data logging mode. See section 11.3.1.

15
4. Conductivity Mode
4.1 Selecting Conductivity Mode
1. Select Conductivity Mode ( →
→→
→F2:Mode →
→→
→F2:Conductivity ).
2. The 90-FLMV 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 90-FLMV 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 Setting the Conductivity sensor k factor
The 90-FLMV automatically recognises a k=10 sensor. If a k=10 sensor is being used, go directly
to section 4.4.
The 90-FLMV does not automatically recognise k=0.1 or k=1 sensors. When a k=0.1 or k=1 sensor
is used, the 90-FLMV must be set to the correct k factor before use.
To select a k=0.1 or k=1 sensor…
1. Select k factor entry ( →
→→
→F4:Setup →
→→
→F4:k factor ).
2. The k factor entry screen is now displayed. The arrow indicates the current selection.
Select nominal k factor,
F1:k=.1 >F2:k=1
Press if a k=0.1 sensor is being used.
Press if a k=1 sensor is being used.
Press to quit without changing the current setting.
Notes
1. The manual k factor selection is reset to k=1 during initialisation.
2. The 90-FLMV will always automatically recognise a k=10 sensor, regardless of the manual k
factor selection.
3. Calibration settings for k=0.1, k=1 and k=10 sensors are NOT stored separately.
The 90-FLMV requires re-calibration when a new k factor sensor is connected.

16
4.4 Conductivity Calibration
To achieve accurate Conductivity/TDS/Salinity results, the 90-FLMV requires calibration to a
known Conductivity standard. The TDS and Salinity values are derived from the Conductivity
reading and do not require a separate calibration. The conductivity of a solution varies with
temperature. The 90-FLMV uses Automatic Temperature Compensation (ATC) referenced to the
fixed temperature of 25oC.
Before attempting a Conductivity calibration, ensure that the 90-FLMV has been set up correctly
according to sections 4.1 to 4.3.
1. Plug the Conductivity sensor into the Cond/Sal 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 SENSOR WIRES.
Zero Calibration
3. Let the sensor dry in air.
4. Select Conductivity Calibration ( →
→→
→F1:Calibrate →
→→
→F2:Conductivity ).
5. The 90-FLMV will recognise the low conductivity signal and attempt a Zero calibration. For
example…
0*01uS 25.0
o
c
Cond. ZERO Calibration,Press Enter
6. When the reading has stabilised at or near zero, press to calibrate or to quit. The “ ∗ ”
will not be removed after a zero calibration.
Standard Calibration
7. Place the Conductivity sensor into a sample of Conductivity standard. Ensure that it is
immersed correctly, as per the diagram below.
DO NOT place the sensor directly into the bottle of standard. Discard the used sample of
standard after use.
8. Select Conductivity Calibration ( →
→→
→F1:Calibrate →
→→
→F2:Conductivity ). The
calibration screen will be displayed with the Conductivity standard to be used. For example…
2*86mS 25.0
o
c
Cond. 2760uS Calibration,Press Enter

17
9. When the reading has stabilised, press to calibrate. The “ ∗ ” will now be replaced by a
decimal point if calibration was successful.
10. The 90-FLMV is now calibrated for Conductivity. The TDS and Salinity values are derived
from the Conductivity reading and do not require a separate calibration.
Ensure that the sensor is immersed at least as deeply as per the diagram in step 7 for all sample
measurements.
4.5 Conductivity Calibration Notes
1. A Zero calibration should be performed at least monthly. In low conductivity applications
(where a zero error is particularly significant), a zero calibration may have to be done weekly.
2. A Standard calibration should be performed at least weekly. Of course, more frequent
calibration will result in greater confidence in results.
3. All calibration information is retained in memory when the 90-FLMV is switched off. This
information can be recalled or printed later using the GLP function (see section 10).
4. The 90-FLMV displays the value of the standard to which it will attempt to calibrate. Ensure
that the standard value displayed corresponds to the standard that you are using. Alter the
Standards set-up if necessary (see section 4.2).
5. Calibration settings for k=0.1, k=1 and k=10 sensors are NOT stored separately.
The 90-FLMV requires re-calibration when a new k factor sensor is connected.
4.6 Conductivity Calibration Messages
1. If a Zero Calibration has been successfully performed, the 90-FLMV will display the following
message…
0.00uS 25.0
o
c
Calibration OK, Zero=0.01uS
2. If a Standard Calibration has been successfully performed, the 90-FLMV will display the
following message and the calculated k factor of the sensor. For example…
2.76mS 25.0
o
c
Calibration OK, k=0.99
3. If a Standard Calibration has failed, the 90-FLMV will display the following message and the
calculated k factor of the sensor. For example…
Calibration Failure. Check STD=2760uS/cm
k=3.64, Exceeds Limit
Notes
1. The allowable k factor range is +/-25% of nominal. This range is ample to allow for correctly
functioning Conductivity sensors. If calibration fails due to the k factor being outside these
limits, then please consult the Troubleshooting guide (section 18.3) for possible remedies.

18
5. TDS Mode
5.1 Selecting TDS Mode
1. Select TDS Mode ( →
→→
→F2:Mode →
→→
→F3:TDS ).
2. You will now the asked to enter the TDS factor. Type in the required factor between 0.40 and
1.00 and press to save the value or to quit.
The TDS factor will be reset to 0.65 when the meter is initialized.
Input TDS Factor: 0.65
3. The 90-FLMV is now in TDS measurement mode.
5.2 Setting the Conductivity sensor k factor
The 90-FLMV automatically recognises a k=10 sensor.
The 90-FLMV does not automatically recognise k=0.1 or k=1 sensors. When a k=0.1 or k=1 sensor
is used, the 90-FLMV must be set to the correct k factor before use.
To select a k=0.1 or k=1 sensor…
3. Select k factor entry ( →
→→
→F4:Setup →
→→
→F4:k factor ).
4. The k factor entry screen is now displayed. The arrow indicates the current selection.
Select nominal k factor,
F1:k=.1 >F2:k=1
Press if a k=0.1 sensor is being used.
Press if a k=1 sensor is being used.
Press to quit without changing the current setting.
Notes
4. The manual k factor selection is reset to k=1 during initialisation.
5. The 90-FLMV will always automatically recognise a k=10 sensor, regardless of the manual k
factor selection.
6. Calibration settings for k=0.1, k=1 and k=10 sensors are NOT stored separately.
The 90-FLMV requires re-calibration when a new k factor sensor is connected.

19
6. Salinity Mode
6.1 Selecting Salinity Mode
1. Select Salinity Mode ( →
→→
→F2:Mode →
→→
→F4:Salinity ).
2. You will now the asked to select the Salinity units.
Press to select “%” as the units.
Press to select “PSU” as the units..
Salinity Units F1:% F2:PSU
3. The 90-FLMV is now in Salinity measurement mode.
6.2 Setting the Conductivity sensor k factor
The 90-FLMV automatically recognises a k=10 sensor.
The 90-FLMV does not automatically recognise k=0.1 or k=1 sensors. When a k=0.1 or k=1 sensor
is used, the 90-FLMV must be set to the correct k factor before use.
To select a k=0.1 or k=1 sensor…
1. Select k factor entry ( →
→→
→F4:Setup →
→→
→F4:k factor ).
2. The k factor entry screen is now displayed. The arrow indicates the current selection.
Select nominal k factor,
F1:k=.1 >F2:k=1
Press if a k=0.1 sensor is being used.
Press if a k=1 sensor is being used.
Press to quit without changing the current setting.
Notes
1. The manual k factor selection is reset to k=1 during initialisation.
2. The 90-FLMV will always automatically recognise a k=10 sensor, regardless of the manual k
factor selection.
3. Calibration settings for k=0.1, k=1 and k=10 sensors are NOT stored separately.
The 90-FLMV requires re-calibration when a new k factor sensor is connected.

20
7. pH Mode
7.1 Selecting the pH Buffer Set
The 90-FLMV can be programmed to automatically recognise any of the following buffer sets
during pH calibration. All pH values listed below are at 25 OC.
1. pH4.01, pH7.00, pH9.18
2. pH4.01, pH7.00, pH10.01
3. pH4.01, pH6.86, pH9.18
4. pH4.01, pH6.86, pH10.01.
To select the pH buffer set for automatic recognition…
1. Select the pH Buffer set-up menu.
( →
→→
→F4:Setup →
→→
→F1:Standards →
→→
→F3:pH Buffers ).
2. The primary buffer selection menu is now displayed…
Select Primary Buffer
>F1:7.00pH F2:6.86pH
The arrow indicates the current selection.
Press to select pH7.00 as the Primary Buffer.
Press to select pH6.86 as the Primary Buffer.
Press to quit without changing the current setting.
3. The secondary buffers selection menu is now displayed…
Select Secondary Buffers
>F1:4.01/9.18pH F2:4.01/10.01pH
The arrow indicates the current selection.
Press to select pH4.01 and pH9.18 as the Secondary Buffers.
Press to select pH4.01 and pH10.01 as the Secondary Buffers.
Press to quit without changing the current setting.
Notes
1. The selected buffer set is kept in memory when the meter is switched off.
2. pH9.18 and pH10.01 buffers are unstable once the bottles have been opened. Discard
immediately after use .
3. If you wish to use a pH buffer other than one of those listed above, its value can be keyed in
during calibration. Make sure that you have pH versus Temperature data for the buffer.