ADWA AD330 User manual

USER MANUAL
AD 330
EC/TDS/Temperature
Portable Meter
www.adwainstruments.com

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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].
WARRANTY
Adwa warrants this product to be free of defects in material
and workmanship as stated in the operating manual. If repair
or adjustment is necessary and has not been the result of
abuse, misuse or improper handling within the warranty period,
please contact your dealer or nearest Adwa Office for the RGA
(Return Goods Authorization) number to put on the outside of
your package. Warranted service will be made without charge.
The meter is warranted for a period of 2 years, while probes
are warranted for 6 months. The warranty period commences
from the original date of sale. Warranty is only valid when the
product is used under normal conditions and in accordance
with the instruction manual. The warranty is void if the instrument
is repaired or serviced by unauthorized personnel, not used in
accordance to the instructions, or if non-Adwa accessories
such as buffer solutions, probes, etc. are used in conjunction
with the meter. Adwa will not be held responsible for any accident
whether directly or indirectly, caused by the use of this instrument.

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Introduction ................................................................ 4
Technical Data .......................................................... 6
Front and Rear Panels .............................................. 8
Operational Guide .................................................... 10
Autoranging ............................................................. 13
Temperature Compensation .................................... 14
EC Calibration ......................................................... 16
Temperature Adjustment ........................................ 21
Setup ........................................................................ 22
Good Laboratory Practice ....................................... 25
Hold ......................................................................... 28
Battery Replacement .............................................. 29
Probe Maintenance ................................................. 30
Probes and Solutions ............................................... 31
TABLE OF CONTENTS

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AD330 is a heavy-duty portable microprocessor-based
instrument for measuring conductivity, TDS and
temperature.
The autoranging feature of the EC and TDS readings
automatically sets the instrument to the scale with the
highest resolution.
Measurements are compensated for temperature effect
automatically (ATC) or manually (MTC).
The temperature compensation feature can also be
disabled to measure the actual conductivity.
The temperature coefficient is user selectable.
The instrument also features a measurement stability
indicator, GLP capability, and a user selectable ID
code to uniquely identify the instrument.
INTRODUCTION

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This model is supplied complete with:
•AD76309 conductivity probe with built-in temperature
sensor and 1 m cable
• Calibration solution (20 ml sachet each):
• 1413 μS/cm EC standard solution
• 12,88 μS/cm EC standard solution
•1.5 V AA alkaline batteries (4 pcs)
•User manual

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TECHNICAL DATA
Range 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
Resolution 0.01, 0.1, 1 μS/cm; ppm
0.01, 0.1 mS/cm; ppt
0.1 °C
Accuracy ±1% f.s. (EC/TDS)
(@25 °C/77 °F) ±0.5 °C
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 °C
Temperature User selectable
Coefficient from 0.00 to 10.00%/°C
TDS Factor User selectable from 0.40 to 1.00
(default value: 0.50)

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Reference Temperature
Selectable from 15.0 to 30.0 °C
Probe (included) AD76309 EC probe
with built-in temperature sensor
Battery Type & Life
4x1.5 V AA (Alkaline batteries)
approx. 200 hours of continuous use
Auto-Off User selectable
5 minutes or disabled
Environment 0 to 50 °C;
RH max 95% non-condensing
Dimensions 188 x 96 x 70 mm
Weight 460 g

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FRONT AND TOP PANELS

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1. Probe holder
2. Connector for EC probe
3. ON/OFF key, to turn the instrument ON and OFF
4. HOLD/GLP key, to freeze the first stable reading
on the LCD and to display Good Laboratory Practice
information
5. CAL/SETUP key, to enter/exit calibration and setup
modes
6. CFM key, to confirm values
7. SHIFT key, to activate the key alternate function
Press and hold first the SHIFT key and then the
second desired key
8. Down arrow key, to manually decrease the value of
temperature or other parameters
9. Up arrow key, to manually increase the value of
temperature or other parameters
10. RANGE/“lock” key, to select measurement unit
or switch the focused data, and to freeze current
range on the LCD
11. Secondary display
12. Primary display

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• The meter is supplied complete with four 1.5 V AA
alkaline batteries. Remove the cover, unwrap the
batteries and install them while paying attention to their
polarity (also see “ Battery Replacement” section).
• To prepare the instrument for use, connect the EC probe
to the DIN connector. Tighten the threaded ring and
make sure the probe sleeve is properly inserted.
INSTRUMENT START-UP
• Turn the instrument on by pressing the
ON/OFF button.
• At start-up the display will show all used segments for
a few seconds (or while the button is held), followed
by the reference temperature value with “rEF”
indication, then enters the measurement mode.
OPERATIONAL GUIDE

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• To save battery life, the auto-off feature automatically
turns the meter off after 5 minutes with no button
pressed. This feature can be disabled by entering the
setup mode and selecting the “AoFF” item (see “Setup”
section for details).
TAKING MEASUREMENTS
• Immerse the probe into the solution
to be tested. The sleeve holes must
be completely submerged.
• Tap the probe repeatedly to remove
any air bubbles that may be trapped
inside the sleeve.
• If needed, press RANGE until the
desired EC or TDS range is displayed.
• Allow for the reading to stabilize. The primary LCD
will show the EC or TDS reading in the selected range,
while the temperature is displayed on the secondary
LCD.

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Notes:
•If the meter displays only dashes “----”, the reading
is out of range.
•If the stability indicator (hourglass symbol) blinks,
the reading is not stable.
•Make sure the meter is calibrated before taking
measurements.
•If measurements are taken successively in
different samples, for accurate reading it is
recommended to rinse the probe thoroughly with
deionized water before immersing it into the
sample.
•TDS reading is obtained by multiplying the EC
reading by the TDS factor, which has a default
value of 0.50. It is possible to change the TDS
factor within the 0.40 to 1.00 range by entering
setup mode and selecting the “tdS” item (see
“Setup” section for details).

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The EC and TDS scales are autoranging. The meter
automatically sets the scale with the highest possible
resolution.
By pressing SHIFT and “lock”
keys, the autoranging feature is
disabled and the current range is
frozen on the LCD.
The μS, mS, ppm or ppt tag
(depending on the selected
measurement mode and range)
starts blinking.
To restore the autoranging option press the SHIFT and
“lock” keys again.
Note: Autoranging is automatically restored if range is
changed, if setup or calibration mode is entered,
or if meter is turned off and back on again.
AUTORANGING

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TEMPERATURE COMPENSATION
Three options are available for temperature compensa-
tion:
1. Automatic (ATC): the EC probe features a built-in
temperature sensor, which provides the temperature
reading to automatically compensate the EC/TDS
measurement (from -9.9 to 120.0 °C), also using the
selected reference temperature.
2. Manual (MTC): the temperature value can be manually
set using the arrow keys. The compensation is referenced
to the selected reference temperature. While in MTC
mode, the °C tag blinks on the secondary LCD.
3. No compensation (NOTC): the temperature is not
taken into account. The reading displayed on the
primary LCD is the actual EC or TDS value.
Notes:
• The default compensation mode is ATC.
• Temperature compensation setting can be
accessed by entering the setup mode and
selecting the “tcE” item (see “Setup” section for
details).

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• If the temperature compensation is active,
measurements are compensated using the
temperature 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 -9.9 to
120.0 °C interval and the ATC option is selected,
the temperature full scale value will be displayed,
together with the °C tag blinking.
• The reference temperature can be set from 15
to 30 °C. When the reference temperature is
changed, the temperature coefficient must be
manually adjusted by the user.
For example, if αis the coefficient with reference
temperature of 25 °C, if changing the temperature
to 20 °C, the new coefficient can be calculated
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.

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STANDARD CALIBRATION
EC calibration is a one-point procedure. Selectable
calibration points are: 0.00, 84.0 and 1413 μS/cm, 5.00,
12.88, 80.0 and 111.8 mS/cm.
• Rinse the probe with calibration
solution or deionized water, then
immerse it into the solution. The sleeve
holes must be completely submerged.
• Tap the probe repeatedly to remove
any air bubbles that may be trapped
inside the sleeve.
• To enter EC calibration, select the
EC range and press CAL key.
Note: TDS readings are automatically derived from the
EC readings and no specific calibration for TDS
is needed. Pressing CAL when TDS range is
selected has no effect.
• For zero calibration, simply leave the dry probe in the
air. The “CAL” and “BUFFER” tags light up.
EC CALIBRATION

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• The primary LCD displays the not calibrated EC reading,
while the secondary LCD shows one of the available
standard values. The hourglass symbol blinks.
• If necessary, use the arrow keys to select the desired
standard value.
• When the reading is stable, the CFM tag starts blinking.
Press CFM to confirm calibration.
• The instrument displays the “Stor” and “Good” messages
and returns to measurement mode.

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Notes:
• If the temperature is out of range, the “WRONG
BUFFER TEMP” message blinks on the LCD. If the
reading is too far from the expected value, “WRONG
BUFFER” blinks.
• For best results choose a standard value for calibration
close to the sample to be measured.
• During standard calibration the meter uses 1.90%/°C
compensation coefficient. If the setup item “tc” has
been set to different value, when exiting calibration
mode, the displayed valued on the upper LCD might
be different from the nominal standard value.
CUSTOM CALIBRATION
It is also possible to perform EC calibration with custom
calibration solution.
• Immerse the probe in the custom calibration solution
and select the EC range. Press CAL to enter the EC
calibration and then the RANGE key to enter custom
EC calibration mode.

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• The “CAL”, “BUFFER” and “Cal Point Custom” tags
light up. The primary LCD displays the not calibrated
temperature compensated EC reading, while the
secondary LCD shows the temperature compensated
EC reading, factory calibrated with (cell value) k=1.
The hourglass symbol blinks.
• Using the arrow keys, adjust the EC reading on the
primary LCD to the desired value.
• The maximum adjustment is ± 40% around the
secondary LCD reading.
• When the reading is stable, the CFM tag starts blinking
on the LCD. Press CFM to confirm calibration.
• The instrument displays the “Stor” and “Good”
messages and returns to measurement mode.

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Notes:
• Zero calibration is not allowed in custom mode.
• The calibrated custom value is considered the value
of the calibration solution at the selected reference
temperature.
•It is possible to set the cell constant value directly,
without following the calibration procedure. To set the
cell constant enter the setup mode and select the
“CELL” item (see “Setup” section for details).
• The temperature reading is not used during custom
EC calibration.