ADWA AD8000 User manual

1
USER MANUAL
www.adwainstruments.com
AD8000
pH/mV/EC/TDS/Temperature
Bench Meter
60
MANAD8000 09/14
ADWA INSTRUMENTS Kft.
Alsókikötõ sor 11, 6726 Szeged, Hungary
Tel. [phone]
Fax [phone]
e-mail: [email protected]
www.adwainstruments.com

2
Dear Customer,
Thank you for choosing an Adwa product.
Please read carefully this manual before starting
operations.
This instrument is in compliance with the EMC directive
2004/108/EC and its standards, and Low Voltage
Directive 2006/95/EC and its standards for electrical
equipments.
For additional technical information, please e-mail us at
[email protected].
59

3
TABLE OF CONTENTS
Introduction ............................................................... 4
Technical Data .......................................................... 6
Front and Rear Panels ............................................... 8
Operational Guide ................................................... 10
Autoranging ............................................................. 20
pH Calibration ......................................................... 21
Relative mV Calibration ......................................... 28
EC Calibration ......................................................... 29
Good Laboratory Practice ....................................... 34
Setup ........................................................................ 44
Hold Function.......................................................... 50
Probe Maintenance .................................................. 51
Troubleshooting Guide ........................................... 54
Electrodes, Probes and Solutions ........................... 56
58

4
INTRODUCTION
AD8000 is a microprocessor-based pH, ORP, con-
ductivity, TDS and temperature bench meter. Relative
mV feature is also provided.
The autoranging feature of the EC and TDS ranges au-
tomatically sets the instrument to the scale with the highest
resolution.
pH measurements are compensated for temperature
effect automatically (ATC) using AD7662 temperature
probe, while the EC readings can be compensated auto-
matically (ATC) using the conductivity probe with built-
in temperature sensor or manually (MTC). It is also pos-
sible to disable the temperature compensation and mea-
sure the actual conductivity.
The temperature coefficient is user selectable.
The pH calibration can be performed at 1, 2 or 3 points
with five memorized buffers (pH 4.01, 6.86, 7.01, 9.18,
10.01).
In addition, AD8000 is provided with calibration time-
out alarm, GLP feature to view last calibration data and
automatic HOLD feature to freeze the first stable read-
ing on the LCD.
57
AD70030P 12.88 mS/cm solution,20 ml sachet, 25 pcs
AD7030 12.88 mS/cm EC standard solution, 230 ml
AD7033 84 μS/cm EC standard solution, 230 ml
AD7034 80.00 mS/cm EC standard solution, 230 ml
AD7035 111.80 mS/cm EC standardsolution, 230 ml
AD7039 5000 μS/cm EC standard solution, 230 ml
AD7082 Refilling solution, 3.5M KCl, 4x30 ml
AD70300 Storage solution, 230 ml bottle
AD7061 Electrode cleaning solution, 230 ml bottle

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This model is supplied complete with:
• AD1131B refillable pH electrode with glass body,
BNC connector and 1 m cable
•AD76309 conductivity probe with built-in tempera-
ture sensor and 1 m cable
•AD7662 stainless steel temperature probe, 1 m cable
• pH 4.01 and pH 7.01 calibration buffers (20 ml
sachet each)
• EC calibration solutions at 1413 μS/cm and 12.88 mS/
cm (20 ml sachet each)
• 12 Vdc power adapter
• User manual
56
ELECTRODES, PROBES AND SOLUTIONS
AD1131B Refillable pH electrode with glass body, pro-
tection bottle, BNC connector and 1 m cable.
AD1230B pH electrode with Epoxy body, tip protection
bottle, BNC connector and 1 m cable.
AD3230B ORP electrode with Epoxy body, tip pro-
tection bottle,BNC connector and 1 m cable.
AD76309 Conductivity probe with built-in tempera-
ture sensor, DIN connector and 1 m cable.
AD7662 Stainless steel temperature probe with 1 m
cable.
AD70004P pH 4.01 buffer solution, 20 ml sachet, 25 pcs.
AD7004 pH 4.01 buffer solution, 230 ml bottle
AD70007P pH 7.01 buffer solution, 20 ml sachet, 25 pcs.
AD7007 pH 7.01 buffer solution, 230 ml bottle
AD70010P pH 10.01 buffer solution, 20 ml sachet, 25 pcs.
AD7010 pH 10.01 buffer solution, 230 ml bottle
AD70000P Electrode rinsing solution, 20 ml sachet,
25 pcs.
AD7000 Electrode rinsing solution, 230 ml bottle
AD70031P 1413 μS/cm solution, 20 ml sachet, 25 pcs
AD7031 1413 μS/cm solution, 230 ml bottle

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TECHNICAL DATA
Range -2.00 to 16.00 pH /-2.000 to 16.000 pH
±699.9 mV / ±2000 mV
0.00 to 19.99 μS/cm; 0.00 to 9.99 ppm
20.0 to 199.9 μS/ cm; 10.0 to 99.9 ppm
200 to 1999 μS/cm; 100 to 999 ppm
2.00 to 19.99 mS/cm; 1.00 to 9.99 ppt
20.0 to 199.9 mS/cm; 10.0 to 99.9 ppt
-9.9 to 120.0°C (pH range)
0.0 to 100.0°C (EC range)
Resolution 0.01 pH / 0.001 pH
0.1 mV (±699.9 mV) / 1 mV (±2000 mV)
0.01, 0.1, 1 μS/cm; ppm
0.01, 0.1 mS/cm; ppt
0.1°C
Accuracy ± 0.01 pH / ± 0.002 pH
(@25°C) ± 0.2 mV up to ± 699.9 mV
± 1 mV up to ± 2000 mV
± 1% f.s. (EC/TDS)
± 0.5°C
Relative mV offset range
± 2000 mV
55
The display
shows blinking
“-2.00 pH” or
“16.00 pH” .
The display
shows blinking
“+/-2000 mV” .
The display
shows blinking
EC or TDS
reading.
The meter does
not work with
temp. probe.
The meter fails to
calibrate or gives
faulty readings.
At start-up all
LCD tags fixed.
“Err xx” error mes-
sage displayed.
pH reading out
of range.
mV reading out
of range.
EC or TDS read-
ing out of range.
Broken temp.
probe.
Broken
electrode.
One key is
blocked.
Internal error.
Recalibrate the meter.
Make sure the sample
is within the specified
pH range. Check
electrolyte level and
electrode general state.
Electrode not
connected.
Recalibrate the meter.
Make sure the sample
is within the specified
range and the “lock”
key was not pressed.
Replace the tempera-
ture probe.
Replace the electrode.
Check the keyboard or
contact the vendor.
Power the meter off
and on again. If the er-
ror persists, contact
the vendor.

7
pH Calibration
Up to 3-point calibration,
5 buffer available (4.01, 6.86, 7.01, 9.18, 10.01 pH)
EC Calibration Offset at 0.00 μS/cm;
Slope at 1 point with 6 memorized values
(84.0, 1413 μS/cm; 5.00, 12.88, 80.0, 111.8 mS/cm) or
with custom value
Temperature Automatic or manual
Compensation -9.9 to 120.0°C (pH range)
0.0 to 100.0°C (EC range)
Temperature 0.00 to 10.00%/°C
Coefficient (EC) (default: 1.90%/°C)
TDS Factor Selectable from 0.40 to 1.00
(default value: 0.50)
pH electrode AD1131B
EC probe AD76309
with built-in temperature sensor
Power supply 12 Vdc power adapter
Dimensions 230 x 180 x 50 mm
Weight 1.8 kg
Environment 0 to 50°C
RH max. 95% non-condensing
54
TROUBLESHOOTING GUIDE
SYMPTOM
Slow response/
excessive drift
measuring pH.
Reading
fluctuate up and
down (noise).
Out of range in
the mV scale.
The meter does
not accept the
buffer solution
for pH calibra-
tion.
PROBLEM
Dirty pH electrode.
Clogged/dirty junc-
tion. Low electro-
lyte level (refillable
pH electrodes only).
EC probe sleeve not
properly inserted;
air bubbles inside
sleeve.
Dry membrane/dry
junction.
Out of order pH elec-
trode.
SOLUTION
Soak the electrode
tip in deionized wa-
ter for 30 minutes
and then clean the
electrode.
Clean the electrode.
Refill with fresh so-
lution (refillable pH
electrodes only).
Properly insert the
sleeve. Tap the
probe to remove air
bubbles.
Soak in AD70300 stor-
age solution for at
least one hour.
snsmfl
Follow the cleaning
procedure. If neces-
sary, replace the
electrode.

8
Front Panel
Rear Panel
FRONT AND REAR PANELS
53
before taking measurements.
EC PROBE MAINTENANCE
After measurements, rinse the probe with clean water.
If a more thorough cleaning is required, remove the probe
sleeve and clean the probe with a cloth or a nonabrasive
detergent.
Make sure to reinsert the sleeve onto the probe properly
and in the right direction.
After cleaning the probe, recalibrate the instrument.

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1. Liquid Crystal Display (LCD)
2. SETUP key, to enter/exit setup mode
3. CFM key, to confirm values
4. CAL key, to enter/exit calibration mode
5. Up arrow key, to manually increase the value of
temperature or other parameters
6. Down arrow key, to manually decrease the value of
temperature or other parameters
7. SHIFT key, to activate the key alternate function
(press and hold first the SHIFT key and then the
second desired key)
8. “lock” key, to freeze current EC range on the LCD
or to clear pH calibration parameter
9. RANGE/MODE key, to select measurement unit
or switch the focused data and to select measure-
ment mode or pH resolution
10. ON/OFF key, to turn the instrument ON and OFF
11. HOLD/GLP key, to freeze the first stable reading
on the LCD and to display GLP information
12. Power supply socket
13. Conductivity probe connector
14. Reference input socket
15. BNC connector for pH or ORP electrode
16. Temperature probe socket
52
drops of AD70300 storage solution.
Note: NEVER STORE THE ELECTRODE IN DIS-
TILLED OR DEIONIZED WATER.
PERIODIC MAINTENANCE
Inspect the probe and cable. The cable used for con-
nection to the instrument must be intact and there must
be no points of broken insulation on the cable or cracks
on the pH electrode stem or bulb.
Connectors must be perfectly clean and dry. If any
scratches or cracks are present, replace the probe. For
pH electrodes, rinse off any salt deposits with water.
For refillable electrodes:
Refill the electrode reference chamber with fresh
AD7082 electrolyte solution. Allow the electrode to
stand upright for 1 hour. Follow the storage procedure.
pH ELECTRODE CLEANING PROCEDURE
Soak the electrode tip in deionized water for approxi-
mately 30 minutes.
IMPORTANT: After performing a cleaning procedure,
rinse the electrode thoroughly with deionized water and
soak it in AD70300 storage solution for at least 1 hour

10
OPERATIONAL GUIDE
CONNECTIONS
• Plug the 12 Vdc adapter into the power supply socket.
Note: This instrument uses non volatile memory to re-
tain the calibration parameters and all other set-
tings even when unplugged.
• For pH or ORP measurements, connect the electrode
to the BNC connector. For electrodes with separate
reference, connect the reference electrode plug to the
reference socket.
• For temperature measurements and automatic tem-
perature compensation, connect the temperature probe
to the appropriate socket.
• For EC and TDS measurements, connect the probe to
the 7-pin connector. Tighten the threaded ring and make
sure the probe sleeve is properly inserted.
51
PROBE MAINTENANCE
pH ELECTRODE PREPARATION
Remove the electrode protective cap.
DO NOT BE ALARMED IF SALT DEPOSITS ARE
PRESENT. This is normal with electrodes and they will
disappear when rinsed with water.
During transport, tiny bubbles of air may form inside the
glass bulb affecting proper functioning of the electrode.
These bubbles can be removed by shaking down the
electrode as you would do with a glass thermometer.
If the bulb and/or junction is dry, soak the electrode in
AD70300 storage solution for at least one hour.
For refillable electrodes:
If the filling solution (electrolyte) level is more than 2.5
cm below the fill hole, add AD7082 electrolyte solution.
For faster response, unscrew the fill hole screw during
measurements.
pH ELECTRODE STORAGE
To minimize clogging and assure a quick response time,
the glass bulb and the junction of the pH electrode should
be kept moist and not allowed to dry out.
Replace the solution in the protective cap with a few

11
INSTRUMENT START-UP
• Turn the instrument on by pressing
the ON/OFF button.
• All LCD tags are displayed and a
beep is generated while the instru-
ment performs a self test.
Notes:
•The instrument starts in the same range and mode
as it was at power off.
• The RANGE key toggles between pH, mV and
EC ranges.
• The SHIFT and MODE keys change the dis-
played information for the selected range.
50
To freeze the first stable reading on
the LCD, press the HOLD key from
measurement mode (pH, mV or EC
range).
The “Auto” and “H” tags will blink on the LCD until
the reading is stabilized.
When the reading is stable, the “H” tag stops blinking
and “Auto” tag turns off. The reading is frozen.
Press the HOLD key again to return the normal mea-
surement mode.
HOLD FUNCTION

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pH MEASUREMENTS
Make sure the instrument has been calibrated before
taking pH measurements.
•Press RANGE to enter pH range.
Note: To change pH resolution press and hold first
SHIFT and then MODE key.
• Immerse the electrode tip and the tem-
perature probe approximately 4 cm into
the sample to be tested and stir gen-
tly. Allow for the reading to stabilize.
• The pH value is displayed on the pri-
mary LCD and the temperature on the
secondary LCD.
• If the pH reading is out of
range, the closest full-scale
value will blink on the pri-
mary LCD.
49
Reference temperature
• Press CAL when the ref-
erence temperature is dis-
played. The reference tem-
perature value will start
blinking.
• Use the arrow keys to change the reference tempera-
ture value (15 to 30ºC ).
• Press CFM to save the new value, or CAL to escape
without saving.
Temperature compensation mode
• Press CAL when the tem-
perature compensation is
displayed. The temperature
compensation mode will
start blinking.
• Use the arrow keys to change the temperature com-
pensation mode (Atc, Mtc or notc).
• Press CFM to save the new setting, or CAL to escape
without saving.

13
• If measurements are taken successively in different
samples, it is recommended to rinse the electrode thor-
oughly with deionized or tap water and then with some
of the next sample.
• The pH reading is affected by temperature. In order
to measure the pH accurately, the temperature effect
must be compensated for.
To use the ATC (Automatic Temperature Compensa-
tion) capability of the instrument, connect the AD7662
temperature probe, immerse it into the sample as close
as possible to the pH electrode and wait for a few
seconds.
• If the solution temperature is known, MTC (Manual
Temperature Compensation) can be performed by dis-
connecting the temperature probe.
The display will show the de-
fault temperature of 25°C or
the last temperature reading
with the °C tag blinking.
• The temperature can be adjusted using the arrow keys
(from -9.9°C to 120.0°C).
48
TDS factor
• Press CAL when the TDS
factor is displayed. The
TDS factor starts blinking.
• Use the arrow keys to
change the TDS factor (0.40
to 1.00).
• Press CFM to save the modified value, or CAL to
escape without saving.
Temperature compensation coefficient
• Press CAL when the tem-
perature compensation co-
efficient is displayed. The
temperature compensation
value will start blinking.
• Use the arrow keys to change the coefficient (0.00 to
10.00 %/ºC).
• Press CFM to save the new value, or CAL to escape
without saving.

14
ORP (mV) MEASUREMENTS
Oxidation-Reduction Potential (ORP) measurements pro-
vide the quantification of the oxidizing or reducing power
of the tested sample.
To correctly perform a redox measurement, the surface
of the ORP electrode must be clean and smooth.
• Press RANGE to enter mV range.
• Immerse the tip of the ORP electrode 4
cm into the sample to be tested and al-
low a few seconds for the reading to sta-
bilize.
• The instrument displays the mV reading
on the primary LCD and the tempera-
ture on the secondary LCD.
• If the reading is out of
range, the closest full-scale
value will blink on the pri-
mary LCD.
47
SETTING RANGE SPECIFIC PARAMETERS
pH Range
Calibration time-out alarm
• Press CAL when the cali-
bration time-out is displayed.
Calibration time-out value
(OFF or 1 to 7 days) will
start blinking.
• Use the arrow keys to change the value.
• Press CFM to save the new calibration time-out value,
or CAL to escape without saving.
EC/TDS Range
Cell constant
• Press CAL when the cell
constant is displayed. The
cell constant value will start
blinking.
• Use the arrow keys to change the cell constant (0.500 to
1.700).
• Press CFM to save the new cell constant value, or
CAL to escape without saving.

15
RELATIVE mV MEASUREMENTS
• To enter relative mV mode, from mV (ORP) range,
press and hold first SHIFT and then MODE key.
• The relative mV reading will be displayed on the pri-
mary LCD and the current temperature value on the
secondary LCD.
Note: The displayed relative mV reading is the differ-
ence between the current mV input value and
the relative mV offset established in the relative
mV calibration.
CONDUCTIVITY MEASUREMENTS
• Enter the conductivity (EC) measurement range by
pressing the RANGE key.
• Immerse the probe into the solution to
be tested. The sleeve holes must be
completely submerged.
• Tap the probe repeatedly to remove any
air bubble that may be trapped inside
the sleeve.
46
• Press RANGE. The minutes
will start blinking.
• Use the arrow keys to
change the minutes.
• Press CFM to save the new value, or CAL to escape
without saving.
Current date
• Press CAL when the current
date is displayed. The year
will start blinking.
• Use the arrow keys to
change the year.
• Press RANGE. The month
will start blinking.
• Use the arrow keys to
change the month.
• Press RANGE. The day will
start blinking.
• Use the arrow keys to
change the day.
• Press CFM to save the modified value, or CAL to
escape without saving.

16
• Allow for the reading to sta-
bilize. The primary LCD dis-
plays the measurement in
the selected range, while the
temperature is displayed on
the secondary LCD.
• If the reading is out of
range, the full-scale value
(i.e. 199.9 mS) will blink.
• If “lock” was pressed to freeze the LCD range and
the reading is out of range, the full-scale value of the
frozen range will blink.
The EC reading is affected by temperature. Three op-
tions are available for temperature compensation:
1. Automatic (ATC): the EC probe features a built-in
temperature sensor, which provides the temperature
reading to automatically compensate the EC and TDS
measurements (from 0.0 to 100.0°C), also using the
selected reference temperature.
2. Manual (MTC): the temperature value can be manu-
ally set using the arrow keys. The compensation is
referenced to the selected reference temperature.
While in MTC mode, the °C tag blinks on the second-
ary LCD.
45
• Press CFM to save the modified value or CAL to es-
cape without saving.
• Use the arrow keys to select the next/previous pa-
rameter.
SETTING COMMON PARAMETERS
Instrument ID
• Press CAL when the instrument ID is displayed. The
instrument ID (0000 to 9999) will start blinking.
• Use the arrow keys to change the value.
• Press CFM to save the new instrument ID value, or
CAL to escape without saving.
Current time
• Press CAL when the cur-
rent time is displayed. The
hour will start blinking.
• Use the arrow keys to
change the hour.

17
3. No compensation (NOTC): the temperature is not
taken into account. The reading displayed on the pri-
mary LCD is the actual EC or TDS value.
Notes:
• The default compensation mode is ATC.
• Temperature compensation setting can be ac-
cessed by entering the setup menu and selecting
the “tcE” item (see “Setup” section for details).
• If no temperature probe is detected, ATC mode
can not be selected and the instrument displays
only dashes “----” on the secondary LCD.
• If the temperature compensation is active, mea-
surements are compensated using the tempera-
ture coefficient (default value 1.90 %/°C).
To change the temperature coefficient, enter the
setup mode and select the “tc” item (see “Setup”
section for details).
• If the temperature reading is out of the 0.0 to
100.0°C interval and the ATC option is selected,
the temperature full scale value will be displayed,
together with the °C tag blinking. No tempera-
ture compensation will be performed.
• The reference temperature can be set from 15
to 30°C. When the reference temperature is
44
SETUP
Setup mode allows to view and modify the instrument
parameters.
Depending on the selected range, it is possible to view
and/or change specific range parameters and common
parameters (for all ranges).
• Common parameters are: instrument ID, time and date.
• Range specific parameters are: calibration time-out
alarm for the pH range; cell constant, TDS factor, tem-
perature coefficient, reference temperature and tem-
perature compensation for EC and TDS ranges.
• To enter the SETUP mode, press SETUP key from
measurement mode. The instrument will display the
first parameter of the specific range.
• Select the desired parameter using the arrow keys.
• Press CAL to change parameter value. The selected
parameter will start blinking.
• Press RANGE to toggle between displayed param-
eters.
• Use the arrow keys to increase or decrease the dis-
played value.

18
changed, the temperature coefficient must be
manually adjusted by the user.
For example, if α is the coefficient with refer-
ence temperature of 25°C, if changing the tem-
perature to 20°C, the new coefficient can be cal-
culated with the following formula:
β=α/(1-α/20)
If α=1.90%/°C, then β=2.10%/°C.
•Always set reference temperature to 25°C
when measuring TDS.
TDS MEASUREMENTS
• From EC range, press and hold first SHIFT and then
MODE key. The instrument will switch to TDS mea-
suring range.
• The TDS reading will be dis-
played on the primary LCD
and the temperature reading
on the secondary LCD.
• If the reading is out of
range, the full-scale value
(i.e. 99.9 ppt) will blink on
display.
43
Notes:
•If NOTC is selected as temperature compensa-
tion mode during calibration, the temperature co-
efficient is not displayed in GLP.
• To return to measurement mode, press and hold
SHIFT and then GLP key at any moment.
• If no calibration has been performed on the se-
lected range, the “no CAL” message blinks on
the display.

19
• If “lock” was pressed to freeze the LCD range and
the reading is out of range, the full-scale value of the
frozen range will blink on LCD.
TEMPERATURE MEASUREMENTS
• To take the temperature measurements while the in-
strument is in pH or ORP range, connect the AD7662
temperature probe to the appropriate socket on the
rear panel.
Immerse the temperature probe into the sample and
allow the reading to stabilize.
• For EC and TDS ranges, the AD76309 probe is pro-
vided with a built-in temperature sensor.
Note: If the instrument is in pH or ORP range and
AD7662 temperature probe is not connected,
the ºC tag will blink (manual compensation) even
if the EC probe is connected.
42
• Calibration offset factor.
• Reference temperature.
• The temperature coefficient.
• The temperature compensation mode.
• The instrument ID as in the pH GLP mode.

20
AUTORANGING
The EC and TDS scales are autoranging. The meter
automatically sets the scale with the highest possible
resolution.
• By pressing the ”lock” key, the autor-
anging feature is disabled and the cur-
rent range is frozen on the LCD.
The “Auto” and “Off” (autoranging disabled) mes-
sages will be displayed on the LCD for a few sec-
onds.
• To restore the autoranging option, press “lock” key
again. The “Auto” and “On” (autoranging enable)
messages will be displayed on the LCD for a few sec-
onds.
Note: Autoranging is automatically restored if range is
changed, if setup or calibration mode is entered
and if meter is turned off and back on again.
41
• The date.
• Used calibration solution, standard.
• Used calibration solution, custom.
• Cell constant.