Trace2O ARSENOMETER HMAS100 User manual
ARSENOMETER
HMAS100
Portable Arsenic Analyser
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Arsenometer HMAS100
Instruction Manual
v2.0
CONTENTS
1.
INTRODUCTION
3
2.1
GETTING TO KNOW YOUR ARSENOMETER
4
2.2
GETTING STARTED
11
2.3
OPERATING PROCEDURE
17
2.3.1
METHODS
17
2.3.2
PLATING
18
2.3.3
ANALYSIS
20
2.3.4
STANDARD ADDITION ANALYSES –OVERVIEW
22
2.3.5
ADDING A STANDARD ADDITION
23
2.4
TROUBLE SHOOTING
25
2.5
INTERFERENCES
26
2.6
SPECIFICATIONS
26
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Arsenometer HMAS100
Instruction Manual
v2.0
1. INTRODUCTION
The Arsenometer HMAS100 kit is ideal for testing arsenic in natural water
courses, for example lakes and rivers. The Arsenometer HMAS100 is a
rugged field kit using a well established technique for the detection of heavy
metals, Anodic Stripping Voltammetry.
The HMAS100 is very robust and has been designed to be virtually
maintenance free. The instrument is sealed against water ingress and is
housed in a waterproof Peli-case making it suitable for use at site for carrying
out field screening analysis.
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Arsenometer HMAS100
Instruction Manual
v2.0
USB Connector
The USB connector can be used to charge the battery using the supplied car
or mains charger, and also for download/upload and charging via a PC or
laptop.
LCD Screen
The LCD screen tells you what is happening as you go along. It will
continually display the current date and time as well as other useful
indicators such as battery and connection status. The screen is also
backlit enabling use of the instrument under poor lighting conditions.
ON/OFF Button
The ON/OFF is used to turn the instrument on and off, there is also an optional
ten minute auto shutdown feature should you leave the instrument unattended.
Navigation Joystick
The joystick allows you to quickly and easily navigate your way through the menus
and features of the Arsenometer. The joystick provides five controls; Up, Down, Left,
Right and OK. To navigate up, down, left and right simply push the joystick in the
required direction. To select an option or ‘OK’ a choice press the joystick in the
centre.
Cancel Button
Pressing the cancel button will return you to the previous menu or screen.
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Arsenometer HMAS100
Instruction Manual
v2.0
On Screen Indicators
At the bottom of the screen thesesymbolswillappearperiodically
to provideinformation about the instrument’s status.
i
i
Battery fast charge indicator
Batterytricklecharge indicator
Batteryfault/overheat indicator
BatteryFull
Battery 3/4 Full
Battery 1/2 Full
Battery 1/4 Full
Batteryempty
Stirrer on indicator
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Arsenometer HMAS100
Instruction Manual
v2.0
Components and care of components
Electrodes –your kit consists of 3 different types of electrodes:
Counter electrode –this electrode needs the least
maintenance of all. A quick visual inspection to
ensure the electrode has no physical damage.
Reference Electrode –this electrode contains a liquid filled tube,
the liquid can be replenished by using the Reference Electrode
Fill Solution provided in the kit. Perform a visual inspection to
ensure it has no physical damage and ensure there is enough
liquid in the outer tube and that there are no bubbles in the inner
tube. For best performance, the Reference Electrode tip should
be kept wet. Please remove cap before use, and replace after
use. Always place a few drops of deionised water in the cap
before replacing it on the electrode.
Working Electrode –the electrode surface should be
examined for cracks and imperfections that will affect
analysis. The electrode should be regularly polished to
remove contaminants and ensure a smooth mirror-like
surface using the supplied glass platen, polishing cloth and
polishing solution. Ensure that the protective rubber cap is
replaced during storage of the electrode to prevent damage
to the electrode surface. After polishing, Conditioning steps
needs to be undertaken before analysis.
Polishing technique
To polish the electrode, firstly make sure the glass platen and holder are clean and free of
dust or dirt which may cause scratching. Place a clean cloth on the platen and dampen the
cloth with the polishing solution provided. Hold the electrode perpendicular to the platen and
use a smooth figure of eight motion as indicated.
Polish until the surface has a mirror finish and no scratches or imperfections are
seen.
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Arsenometer HMAS100
Instruction Manual
v2.0
The instrument also consists of:
Stirrer –the stirrer will not operate all the time during the different stages
of a run. The stirrer is crucial to the operation of the instrument and
needs to be checked to ensure it is working properly. During a run, look
through the translucent beaker or lightly touch the bottom of the SAB to
determine that the stirrer is rotating when indicated on the handset. The
stirrer has been designed to minimise turbulence thus ensuring
increased repeatability.
Sample Analysis Beaker (SAB) –the SAB has a fixed volume so
that when full and removed from the water course, excess
sample will empty out of the holes levelling off at a constant
volume.
Handset –the handset is waterproof and robust. A periodic visual inspection
to ensure it is not damaged and that the screen is readable will suffice.
Buffers –the buffers are powders, which should be stored in a
dark, cool, dry environment. If stored correctly, these have a
shelf life of 3 years. Refer to individual sachets for expiry dates.
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Arsenometer HMAS100
Instruction Manual
v2.0
Menu System
The Arsenometer
is controlled
via
a systemof
on-screen
menus.
The
structure of these
menus
is
illustrated
belowto
assist
you in
navigating
them.
Main Menu
Test
Methods
→
Condition
Electrode
Used to condition the working electrode with a
Conditioning solution. When used as part of a
test it is used to prime the electrode to increase
sensitivity
→
Analyse
Sample
Used with Calibrate function. Calibration must be
undertaken before analyse sample can be used
→
Standard
Addition
Used to analyse samples and calculate the
unknown concentration by the addition of a
known standard
→
Calibrate
Used with analyse sample. Calibration must be
performed before analyse sample is used
→
Blank
subtraction
Used to set or replace a baseline if contaminants
are suspected in the buffer.
Data Log
→
View Log
Data Log viewing options
→
Last Result
Displays latest result and graph
System
→
Backlight
Backlight control options
→
Set date/time
Used to set the instrument date and time
→
Language
Used to select the display language
→
Charge
Battery charging options
→
Auto switch
off
Auto off select
→
Program
P/STAT
Program internal hardware (Not used in normal
operation)
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Arsenometer HMAS100
Instruction Manual
v2.0
The Sonde Assembly
The sonde (electrodes x 3) SAB (Sample Analysis Beaker)
In-line waterproof cable connector
Warning:
Sonde head is designed for submersion up to 1 metre in
water. Lowering the head deeper than this may result in water ingress
which will require sonde head replacement.
Note: The sonde cable may be fixed to the lid of the Arsenometer box, using
the box closure tabs and the supplied cable clamp. Alternatively, the user may
attach the cable to a suitable fixture at the sample site, eg. branch, rope, fence,
barrier.
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