palintest Wagtech Potalab+ (C) XA User manual

Potalab®
+(C) XA
Wagtech®
ZIPTW10010XA V4 Palintest®
Advanced Portable Water Quality Laboratory
(Non-Arsenic Physico-Chemical)

2
Palintest®
2
Who We Are
Over the last 20 years the Wagtech®name has become synonymous with water testing
in the most extreme circumstances and remote locations.
Developed for a range of applications, from long term surveillance to rapid response testing
in an emergency, the Wagtech®kits provide a robust solution to testing key water quality
parameters in the field.
Acquired by Palintest®in 2011, the manufacture and support of the Wagtech®portable
water quality laboratory range has now been integrated into the Palintest®product family.
Further information regarding the Wagtech®product range can be found at: www.palintest.com
Palintest®and Wagtech®are registered trademarks of Palintest Ltd.

3
6Appendix 1 - Reagents and Consumables 40
3
Contents
1
2
3
4
5
Kit Layout 4
Introduction 8
Photometer 7500 9
Compact Turbimeter 27
Micro 800 Multiparameter Meter (pH and Conductivity) 34
Chapter Page
V4 09/21
Important Information concerning Bluetooth®
The PalintestAqua Pal App that the Photometer in this kit was designed to connect to, via Bluetooth,is now no longer available.
Connectivity is therefore solely via USB. Therefore,all references to Bluetooth have been removed from this user manual. You may still
notice menu options in the instrument relating to Bluetooth and it remains installed and functional on the instrument. However, it would
require third-party software or an application to be developed for it to be useable. Please contact Palintest should you require further
information about this.

44
1Kit Layout
Micro 800
ENTER
HOLD
SAVE
SETUP
MODE VIEW
CAL
MEAS
BACK
3
5
6
12
1
11
2
7
4
14
13
10
8
9
Potalab® + (C) XA Water Test Kit - Layout
Fig 1. Potalab® + (C) XA Physico-Chemical test kit layout.
Coloured circles indicate the chapter colour in which their use is explained.

55
1
Kit Layout
pH and Conductivity
Measurement
Parameter Testing
Using Photometer
7500
Photometer 7500 Contact Supplier
Function Equipment Reorder Code
1
Photometer Cuvettes PT 595/5
2
Reagent Tablets (Chlorine DPD) ‘DPD1 & 3’ APW 031
3
Reagent Tablets (Ammonia) APW 152
4
Nitratest Tube PT 526
6
Reagent Tablets (Nitrate) ‘Nitratest’ APW 163
5
Reagent Tablets (Nitrite) ‘Nitricol’ APW 109
7
Turbidity
Measurement Compact Turbimeter Contact Supplier
8
Turbidity Cuvettes PT 555
9
Silicone Oil PT 120
10
Multiparameter Meter Contact Supplier
11
pH4 Buffer Solution PT 142/15
12
pH7 Buffer Solution PT 142/12
12
Conductivity Solution PT 142/7
12
Other Items Dilution Tube 6610 9032
Instruction Manual
ZI PTW 10010 XA
13
14

66
1Kit Layout
Micro 800
ENTER
HOLD
SAVE
SETUP
MODE VIEW
CAL
MEAS
BACK
15
17
18
16
Potalab® + (C) XA Water Test Kit - Layout
Fig 2. Potalab® + (C) XA Physico-Chemical test kit with instruments removed to show
equipment beneath. Coloured circles indicate the chapter colour in which their use is explained.

77
1
Kit Layout
Parameter Testing
Using Photometer
7500
Function Equipment Reorder Code
Photometer Light Cap 128-038
15
Turbidity
Measurement Turbidity Standards PTC 090
16
pH and Conductivity
Measurement pH Probe PT 1330pH
Conductivity Probe PT 1340CON
17
17
Other Items Lint Free Cleaning Cloth ZP 0155
18
Lint Free Polishing Cloth PT 399
18

8
2Introduction
8
2.0 Introduction
Ideally suited to longer term surveillance and professional monitoring, the Potalab® + (C) XA Advanced
Portable Water Quality Laboratory provides portable analysis of a wide and comprehensive range of key
drinking water quality parameters where the most important factor is to obtain laboratory levels of accuracy.
Built for physico-chemical water testing, the Potalab® + (C) XA is the most advanced portable
water quality laboratory available today.

99
3
Photometer 7500
The Palintest Photometer 7500
is a direct-reading, waterproof photometer for
determining key water quality parameters for
drinking water, wastewater and process water
samples. Designed for both portable and
laboratory use, the Photometer 7500 should
always be used with genuine Palintest reagents
for optimal performance.
The fundamental operating technique applied to
the Photometer 7500 is based on the principles
of optical absorbance and scattering
of visible light.
Optical absorbance techniques are based on the use
of Palintest (spectro)photometric reagents, creating
visible colours with specific analytes upon reaction.
The intensity of colour produced is measured with
the Photometer 7500 and the data compared to
the stored calibration data to deliver the final result.
Optical scattering techniques produce small
particles to scatter the source beam, the amount
of scatter providing a result for the concentration
of parameter under test.
The Photometer 7500 is provided with
programmed methods for a comprehensive range
of water quality parameters. Upon choosing a test
the instrument automatically selects the required
parameters for accurate analysis including
wavelength and reaction time. Upon completion
of the test optional follow-on tests are available
and results can be converted to alternative units
of expression e.g. mg/l to ppm, N or NH3.
The Photometer 7500 offers a choice of either
mains power via the USB port or using three
1.5V ‘AA’ batteries (supplied).
The Photometer 7500 is supported with a two
year warranty and a full range of service,
calibration and technical support. Support
resources are available at www.palintest.com
relating to both products and applications.
3.1 Quick Start
Photometer 7500 Layout
Photometer 7500 Interface
The LCD screen features a selectable backlight
with the screen separated into four clear, easy
to read zones:
3.0 Introduction
Adaptive Cuvette Holder
(do not insert finger!)
LCD screen
with backlight
Numerical keys
for Hotkey
operation and
text entry
USB
Port
Light
Cap
On/
Off
Navigation
Keys
1
2
3
4

10
3Photometer 7500
10
1Mode or Test Identification.
2Dialogue screen - prompts and choices will be
displayed as a list. Select using up/down arrows.
3Info Panel - displays status icons, date/time
and Sample/Operator ID
4Action select - choices are displayed as a row.
Use left/right arrows to select.
Info Panel Icons
3.2 Taking a Sample
The first critical step in any analysis is taking a
representative sample.When selecting a sample point
a number of care points are recommended as follows:
• Ensure the sample point is safe to access and
follow all relevant/required precautions
• When sampling from a tap or outlet, remove
any attachment and clean the tap/outlet with
a dry cloth before allowing the tap/outlet to
run for 1 minute prior to sample collection
• When sampling from a river or stream take the
sample as near as possible to the main flow and
not too close to the edge where the water may be
still and unrepresentative of the sample as a whole
• Rinse any sample container repeatedly with
the sample to prevent any cross contamination
from previous samples
• Once collected the sample must be processed
immediately or as quickly as possible, especially
for highly reactive species such as chlorine for
example. The use of a portable field test kit
makes this possible. However if the delay
between sample collection and analysis is likely
to be several hours chill the sample to preserve
and prevent potential microbiological growth
• Samples containing solid particles can interfere
with photometric analysis. Either allow solids
to settle and decant the clear liquid or filter
the sample prior to analysis
3.3 Starting up the Instrument
Power Supply
The Photometer 7500 is designed to be powered
either from alkaline batteries or via the USB port.
When operating on battery power, the battery
level is indicated on the Info Panel. A minimum
voltage of 3.0V is needed to operate the
photometer and a flashing battery symbol
indicates a critically low battery. Change batteries
immediately or switch to alternative USB power.
The Photometer 7500 will automatically power
down when power is no longer capable
of providing acceptable performance.
To power via the USB port, use the supplied
cable connected either to the mains adaptor
or a PC. The USB icon will appear when the USB
connection is made and battery power will no
longer be consumed.
The Photometer 7500 has a back-up battery
mounted internally to save instrument settings
and data during power loss and instrument
idle periods.
Replacing Batteries
The battery compartment is located on the base
of the instrument and secured by four screws.
Remove the cover and install a complete set of
new batteries, observing the correct polarity as
indicated. Use 3 x 1.5V ‘AA’ alkaline batteries
or equivalent. See Section 3.9 for more details.
To avoid corrosion damage through leakage,
remove batteries from the instrument if it is
to be stored or left unused for a long period.
Start-up Screen
Description
Battery status
Upper/lower case text/number entry
Hotkey Entry Mode Enabled
USB connected
Hard Drive/COM port mode
Icons

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Photometer 7500
The default start-up screen on power up is the
‘Choose a Test’ screen.
To access the Mode menu press the left arrow
key to highlight ‘Menu’ and OK.
To choose a test use the up/down arrows to scroll
through the list and press OK on the desired parameter.
Mode Screen
The Photometer 7500 has four operating modes
as follows:
Choose a Test
The Choose a Test mode is the standard operating
mode for taking photometer readings and is the
default start-up screen on power up. See Section
3.5 for more information.
Hotkey Test List
Assign up to 10 of the most frequently used tests
for single button access when in Hotkey mode,
indicated by the icon in the Info Panel. More
information on how to set up and use Hotkey
mode can be found in Section 3.4.
System Mode
Personalise your Photometer 7500 and manage
stored data within the System mode. Options
include setting Operator/Sample IDs,
interrogating the result log and defining the
instrument operating conditions. See Section
3.4 for further information.
Check Standard Mode
Validate performance of your Photometer 7500
using Palintest Check Standards.
See Section 3.7 for more information.
3.4 System Mode
Personalise your Photometer 7500 and access
the data log via the System Mode.
Scroll up or down using the appropriate keys to
see all available options. The options and available
settings are as follows:
Log
The Photometer 7500 has an internal data log
for up to 500 data points. The data is stored
automatically upon completion of the test and
automatically overwrites the oldest result when the
memory is full. The data log is unaffected by
power on/off.
Each data point is stored in a comma-separated
values (CSV) format and consists of date,
time etc.
Selecting Log offers two choices:
View - to view individual data points use the
up/down keys. Data is stored in chronological order
with the most recent result shown by default.
Scroll through results using the up/down arrows.
Select Back to return to the previous menu.

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3Photometer 7500
12
Clear - the entire log can be deleted from the
Photometer 7500 if the instrument is not locked
(see System Lock). Selecting Clear produces the
following screen:
Data can be downloaded via USB connection
(see USB Interface).
Operator ID
The Photometer 7500 offers the option to create
up to 12 unique alphanumeric Operator IDs.
Operator IDs are added to the result data
automatically but deleting IDs does not affect the
result log.
To create a new Operator ID, select Operator ID
and use the up/down keys to select a blank field.
Select New and press OK.
Alphanumeric characters are entered/edited using
the 0-9 keys or the up/down keys. Press and hold
the 1 key to toggle between upper case, lower
case and numeric characters.
After entering a character, the cursor automatically
moves to the next position if no key is pressed.
Alternatively press the right key.
Up to 10 characters can be added for Operator IDs,
including spaces.
To edit characters use the left/right keys to select
the desired character. Press and hold the left key
to delete the character or change the character
using the entry mode.
When the Operator ID is correct press the OK key
to create the ID and return to the Operator ID
list. The new Operator ID will be displayed in the
Operator list.
Choose the Operator ID to be used by scrolling
through the list and pressing the OK key on the
desired choice. The instrument will return to the
System menu.
To modify or delete an existing Operator ID,
highlight the ID and select Edit. Choose either
Edit to modify the existing entry or Delete to
remove it from the list.

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Photometer 7500
Sample ID
The Photometer 7500 offers the option to create
up to 24 unique alphanumeric Sample IDs.
Sample
IDs are added to the result data automatically but
deleting IDs does not affect the result log.
To create a new Sample ID, select Sample ID
and use the up/down keys to select a blank field.
Select New and press OK.
Alphanumeric characters are entered/edited using
the 0-9 keys or the up/down keys. Press and hold
the 1 key to toggle between upper and lower
case characters.
After entering a character, the cursor automatically
moves to the next position if no key is pressed.
Alternatively press the right key.
Up to 10 characters can be added for Sample IDs,
including spaces.
To edit characters use the left/right keys to select
the desired character. Press and hold the left key
to delete the character or change the character
using the entry mode.
When the Sample ID is correct press the OK key to
create the ID and return to the Sample ID list.The
new Sample ID will be displayed in the Sample list.
Choose the Sample ID to be used by scrolling through
the list and pressing the OK key on the desired choice.
The instrument will return to the System menu.
To modify or delete an existing Sample ID, highlight
the ID and select Edit. Choose either Edit to modify
the existing entry or Delete to remove it from the list.
USB Interface
The waterproof USB interface provides both
communication between the Photometer 7500
and a PC and an alternative mains power
source via the adaptor.
When connected the USB icon will appear, replacing
the battery icon in the Info Panel, as power will
be preferentially drawn from the external source.
The USB data interface has a choice of two
operating modes - Hard Drive and COM Port. The
current status of the USB connection is shown on
the Info panel when the USB lead is connected.
Toggle between COM Port and Hard Disk mode in the
System -> USB menu by selecting the desired option.
The USB connection supports software update and
data download through a simple ‘drag and drop’
approach when operated in Hard Disk mode.
Hard Drive
The instrument appears as a removable hard drive
when connected to a PC in Hard Disk mode. Upon
connection the remote drive will have the
following files included:
• 7500_***.afx.*** where * represent
version numbers of software - this is
the operating software for the Photometer
7500
• Log.txt - the data log file stored in a
comma separated value (csv) format

14
3Photometer 7500
14
Operating software or calibration library can be
updated by dragging a new version to the instrument.
Downloading the result log is carried out by dragging
the LOG.txt to the local desktop and opening the file
with any program that can open CSV format files.
COM Port
The instrument behaves as if connected to the PC
serial port via RS232 when connected in COM Port
mode, allowing remote control from an external
software system and data upload. This allows
backwards compatibility with software written for
earlier models of Palintest instruments. In this mode,
the PC requires installation of a USB virtual COM
A large number of third-party software systems
are available to provide data upload and remote
control of testing using the COM port mode.
Please contact your local Palintest representative
for more details.
Test Selection Method
The Photometer 7500 offers two distinct
methods of selecting test parameters - Phot
Number Entry Mode or Hotkey Entry Mode.
Phot Number Entry Mode is active by default.
Switching to Hotkey mode is carried out by
enabling Hotkey Entry Mode in the Test Selection
Method menu.
Select Hotkey Entry Mode and press OK. If ‘Hotkey
Entry Mode’ is enabled, the icon is displayed
on the Info panel.
Only one Test Selection Method is permitted at
any time.
Phot Number Entry Mode
All methods/calibrations (including User Defined
Tests) are identified by a unique three-digit ID
Phot Number. When operating in Phot Number
Entry Mode, access the test of choice quickly by
typing the three-digit number when in either the
Choose a Test screen or any result screen.
For example, to access the Phot 002 Total
Alkalinity test press ‘002’, ‘02’ or just ‘2’ to
load the method instantly.
Hotkey Entry Mode
This option provides single button access to the
ten most frequently used tests by assigning each
to a unique position on the numerical keypad.
To assign a test to a specific Hotkey (0-9), firstly
ensure that ‘Hotkey Mode’ is enabled.This is
shown by the indicator on the Info Panel.
Select the Hotkey Test List from the Mode menu.
The ten available positions are listed along with
assigned or empty slots.

1515
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Photometer 7500
Select the Hotkey to assign (0-9) and use the
up/down arrows to highlight the required
parameter/method from the Choose a Test list.
Press OK and the test will be assigned to the
defined number.
Units
The Photometer 7500 offers the choice of result
expressed in mg/l, ppm, mmol/l, µmol,
g/l and µg/l.
Changing the result units will not affect the result log.
Dilution Factor
When samples are above the test range, indicated
by >> on the result screen, a dilution procedure can
be used. Setting Dilution Factor to On will prompt
the Photometer 7500 to automatically request the
dilution factor when carrying out a test.
Change the dilution factor by using the up/down
arrows or manually type the dilution factor. The
instrument will automatically correct the result
for the dilution and display the corrected result
(which will also be stored in the result log).
The maximum dilution factor permitted is 99.
If the calculated result exceeds the available number
of permitted characters >> will be displayed
NOTE: do not use sample dilution when
measuring pH or alkalinity.
System Lock
To prevent unauthorised or inadvertent changes
to the System settings or log deletion a four digit
code can be used to lock several options.
The default code is set to 6812. To change the
System Lock code follow the on-screen prompts
to choose a memorable four digit number.
When the System Lock is applied, the items accessible
within the System Mode are limited until the unlock code
is entered.Access is limited to viewing the result log,
adjusting the backlight.

16
3Photometer 7500
16
User Defined Tests
In addition to the many available calibrations/
methods, the Photometer 7500 provides additional
capability for up to 30 User Defined Tests. A
User Defined Test is built using a table of
calibration data consisting of up to 10 data pairs
of absorbance and concentration.
Download or request a copy of Usertestbuilder.exe
(suitable for Windows operating systems) from
our websites to define the details and calibration
data as shown below:
Connect the Photometer 7500 to the PC using
the USB cable provided, ensuring the instrument
is set to Hard Drive mode.
Once data is complete press “Download this test”
to transfer the method details and calibration.
The Photometer 7500 will respond with Test
Data Accepted.
Alternatively save the test data as a *.txt file and
drag and drop onto the Photometer 7500.
User Defined Tests are stored in Phot Numbers 900 - 929
to avoid confusion with standard Palintest calibrations.
Press OK once the test has been uploaded
to view the test in the User Defined Test list.
A number of options are available within
the Edit User Defined Test menu:
BACK return to the previous menu
ADD add additional User Defined Tests
EDIT upload new data for the selected test
DELETE remove the test from the instrument
Accessing User Defined Tests can be carried out by
assigning to Hotkeys (if enabled), scrolling through
the list of tests or entering the required Phot Number.
Language
Select the desired local language for operation,
choosing from English, French, Spanish, German,
Italian and Chinese (Mandarin). The selection of
language will also adjust appropriate tests and
units to local convention as required.
Set Time/Set Date/Date Format
All test results are recorded automatically in the
Data Log and appended with date and time (plus
additional information). Date and time are stored on
an internal clock, supported by a coin cell battery.
To correct the time select Set Time from the
System menu.
Use the up/down keys to adjust the hour; press
the right key to select and adjust the minutes.
Press OK when the correct time is set.
To correct the date select Set Date from the
System menu.
Use the up/down keys to adjust the day/month/year,
using the left/right keys to select the field.
Press OK when the correct date is set.

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Photometer 7500
The Date Format can be set to DD/MM/YYYY or
MM/DD/YYYY as required. To select the required
format highlight the desired choice and press OK.
Time Out
When operating using battery power the
Photometer 7500 provides automatic power-off
as a power-saving measure. Three settings are
provided:
Normal 5 minutes
Long 15 minutes
Off (disables Time Out)
The time intervals begin after the last key is pressed
or activity takes place.
Time Out is automatically disabled when the
instrument is powered by USB supply.
Back Light
The instrument display features a high intensity
backlight to support use in low light conditions.
The backlight is designed to use minimal energy
but activating the Backlight will naturally consume
battery power more rapidly. The settings available
for Backlight are:
Backlight Auto-Dim Backlight activates on any
key press and dims after
15 seconds automatically.
Backlight On Backlight is on permanently
Backlight Off Backlight is off permanently
LCD Contrast
In addition to the Backlight, the default contrast
setting for the display can be adjusted using the
up/down keys when light conditions are difficult.
The display provides a sequence of alternating
squares to give visual indication of the correct
settings to apply.
When complete/acceptable press the OK key.
Version
The serial number of the instrument and the
software version are displayed.The instrument
serial number will be required for technical
support and servicing/warranty and can also
be found on the base of the instrument.
3.5 Analysing Samples
The Photometer 7500 provides simple, accurate
and reliable analysis of key drinking water,
wastewater and process water parameters.
Selecting the required parameter and performing
the test are supported through on-screen prompts
and comprehensive test instructions.
The principle of photometric testing is based on the
absorption or scattering of a measured intensity
of incident light compared to the light intensity
reaching the detector array. The light intensity is
determined as Transmittance (%T) orAbsorbance (A)
and compared to calibration tables stored within the
Photometer 7500.The stored calibration tables
convert %T or A to results in a variety of units
(mg/l, ppm etc.) as defined in Section 3.4.
Calibration tables are defined by Palintest based
on the measurement of reference standards using
Palintest reagents. To achieve the best quality
results there are a small number of care points:
1Always use the provided light cap to prevent
ambient light affecting the results.
2Ensure Sample and Blank cuvettes are clean, dry
and inserted correctly into the sample chamber,
using the allocated orientation mark to align.
3Always blank the instrument with untreated
sample prior to analysis.
Additional guidance is provided in Section 3.8
Photometric Testing Hints and Tips

18
3Photometer 7500
Selecting Test Parameters
The Photometer 7500 offers a number of choices
to select the parameter to test:
Phot Number Entry - use the numeric keypad
to enter the unique Phot Number to directly
access any programmed calibration (including
User Defined Tests).This method will not be
available if the Photometer 7500 is operating in
Hotkey Entry Mode.
Hotkey Entry - use the numeric keypad to
directly access up to 10 of the most commonly
used tests. When operating in this mode the Info
panel will display the icon and Phot Number
Entry mode will be disabled.
Choose a Test - available in either Phot Number
Entry or Hotkey Entry modes, the full list of test
parameters is available by selecting Choose a Test
and scrolling using the up/down keys. When the
desired parameter is highlighted, press the OK
key to access the method. Tests are presented in
Phot Number order.
When the required test is selected the Photometer
7500 automatically selects the correct wavelength
and sets additional method parameters as required.
Test method protocols are defined in detail in the
Palintest Phot Book, supplied with the Photometer
7500, including the reagents and accessories
that may be required.
When a test is selected, the Photometer 7500
screen will display a number of screens and
options to guide the user through the testing
process, as described in the following pages.
Dilution Factor
If selected in the System menu, the initial screen will
request the defined Dilution Factor to apply to results.
If Dilution Factor is not active this screen will not
be shown.
Results shown on the final screen have automatically
been corrected for dilution prior to display. Corrected
results will also be stored in the log.
Blanking the Photometer 7500
Blanking the photometer is a key first step in
photometric analysis, effectively removing the
potential entrained sample colour and minor amounts
of turbidity from calculation of analytical results.
To blank the photometer, prepare a Blank cuvette
using untreated sample i.e. sample that has not
been reacted with any reagents. If the sample is to
be diluted or physically treated (filtered for example)
before analysis, use the same dilution/treatment
for the Blank cuvette.
When accessing the test method the Photometer
7500 will request the user to Insert Blank.
Insert the Blank cuvette and press OK.
18

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3
Photometer 7500
The Photometer 7500 will determine the
absorbance due to the sample colour at
all wavelengths simultaneously and store in
temporary memory for use in analysis.
Upon successful blanking the Photometer 7500
will automatically move to the Insert sample
stage of the analytical method.
If the sample is too highly coloured to support
effective blanking and subsequent analysis the
error message “Error 9 is caused by the blank
cuvette being too dark. Check the correct cuvette
is being used”.
Ensure the blank cuvette is being used, not the
sample plus reagent cuvette. Sample colour can
be reduced by dilution with clean water; the
dilution selected should take account of the
expected concentration of parameter under test.
Blank results are stored in the temporary memory
of the Photometer 7500 and will be used for all
subsequent tests until:
• The instrument is powered down (temporary
memory is lost/deleted)
• A new Blank reading is taken - this option is
available on accessing any subsequent test at
the base of the screen. Repeat the blanking
process if the sample changes significantly
or a new sample is under test
• Some tests use a reversed blanking process
where a coloured blank cuvette may be required.
When changing between standard tests and
‘reverse blank’ test, a new blank sample will be
requested by the Photometer 7500
If the blank value generated in this step is not
detectable an error message will be displayed
“Error 7 is caused by too much ambient light. Try
using the light cover provided with the instrument”.
See Section 3.8 Photometric Testing Hints and
Tips for more advice regarding effective blanking.
Reading Results with the
Photometer 7500
Assuming a suitable blank has been recorded,
the next step of the photometric analysis process
is to carry out the reading step.
Prepare a Sample cuvette following the method
instructions provided in the Palintest Phot Book.
Select Read at the base of the screen and press OK.
At the Insert sample prompt, insert the sample
cuvette ensuring it is clean and dry and oriented
correctly using the location mark.
Press OK to begin the measurement process.
The screen will display Reading...

20
3Photometer 7500
20
At the completion of the measurement process
the result is displayed on screen.
Timer
Many photometric methods require a reaction time
to develop optimise sensitivity, the recommended
time period being documented in the Palintest Phot
Book and included as part of the method parameters
programmed into the Photometer 7500.
Tests requiring a reaction time will have the option to
select an automatic timer to count down the reaction
time required.While in the Insert sample screen use
the right key to move the cursor to highlight Timer.
The programmed reaction time will be displayed.
Press OK to Start the countdown.
Three options will be displayed:
Stop cancel the countdown timer
Exit exits the countdown screen and
returns to the Insert sample
screen. The countdown will
continue and the current time can
be seen by selecting Timer.At the
end of the countdown an audible
alarm will sound to indicate the
sample is ready to read. Select
OK to read the sample manually.
Exit and Read exits the countdown screen and
automatically reads the sample
at the completion of the allocated
time period.
Changing Result Units of Expression
Many chemical species have a number of
alternative units that can be used for reporting
results e.g. Phosphate can be expressed as
PO4or P for example.
Where alternative units of expression for results
are available the ▲▼ symbols will be displayed
next to the current result units. Use the up/down
arrows to change the units of expression as
required. Values are modified automatically.
Results stored in the log will be in the units
selected on screen, changing the chemical species
will add an entry to the log showing the updated
result and species parameter selected.