ADWA AD331 User manual

USER MANUAL
AD331 • AD431 • AD332
WaterproofPortableMeters for
EC and TDS Measurements
www.adwainstruments.com
MANAD331R2 05/09
ADWA HUNGARY Kft.
Alsókikötõ sor 11, 6726 Szeged, Hungary
Tel.[phone]
Fax[phone]
www.adwainstruments.com

DearCustomer,
Thank you for choosing an Adwa product.
Please read carefully this manual before starting operations.
This instrument is in compliance with the EMC Directive 89/
336/EEC and Low Voltage Directive 73/23/EEC 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 pe-
riod, please contact your dealer or the nearest Adwa Office for
the RGA(Return Goods Authorization) number to put on the
outside of your package. Warranted service will be made with-
out charge. The meter is warranted for a period of 3 years,
while probes are warranted for 6 months. The warranty pe-
riod 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 unautho-
rized 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 indi-
rectly, caused by the use of this instrument.
39
PROBES AND SOLUTIONS
AD3005D/1 Conductivity probe with built-in tem-
perature sensor, DIN connector and 1 m
cable
AD6020B 1413µS/cmstandardsolution,20mlsa-
chet, 25 pcs
AD6020-100 1413 µS/cm standard solution, 100 ml
bottle
AD6021-100 12.88 mS/cm standard solution, 100 ml
bottle
AD6022-100 111.8 mS/cm standard solution, 100 ml
bottle
AD6031-100 800 ppm (mg/l) standard solution, 100
mlbottle
AD6032-100 6.44 ppt (g/l) standard solution, 100 ml
bottle
AD6033-100 40 ppt (g/l) / 80.0 mS/cm standard solu-
tion,100mlbottle
AD6040B 1500 ppm (mg/l) standard solution, 20
ml sachet, 25 pcs
AD9551 Serial communication cable

3
Introduction ................................................................ 4
Technical Data .......................................................... 6
Front and Top Panels................................................ 8
Operational Guide.................................................... 10
Autoranging ............................................................. 14
Temperature Compensation .................................... 15
EC & TDS Calibration ........................................... 17
Temperature Adjustment ........................................ 22
Setup ........................................................................ 23
Good Laboratory Practice....................................... 26
Log-on-Demand....................................................... 29
Hold Function .......................................................... 33
Printing (AD332 only) ............................................................34
PC interface (AD332 only) ..................................................36
Battery Replacement .............................................. 37
Probe Maintenance ................................................. 38
Probes and Solutions ............................................... 39
TABLE OF CONTENTS
38
PROBE MAINTENANCE
After measurements, rinse the probe with clean water.
Ifamorethorough cleaning isrequired,removethe probe
sleeve and clean the probe with a cloth or a non-abra-
sive detergent.
Make sure to reinsert the sleeve onto the probe properly
and in the right direction.
After cleaning the probe, recalibrate the instrument.

BATTERY REPLACEMENT
When batteries become too
weak, the “bAtt” message ap-
pears. It is recommended to re-
place the batteries soon.
When the battery level is too low to ensure reliable read-
ings, the meter automatically turns off.
Battery replacement must only
take place in a safe area and us-
ing the battery type specified in
thisinstructionmanual.
Toreplacerundownbatteries, re-
move the battery cover and sub-
stitute all four 1.5VAAalkaline
batteries with new ones, while
payingattentionto thecorrectpo-
larity.
Reattach and tighten the battery
cover making sure that the gas-
ket is in place.
Note: When batteries are removed, the meter can re-
member date & time for about 5 minutes. After
that, it will be necessary to set again date & time
through the setup procedure.
4
AD331, AD431 and AD332 are waterproof portable
meters.
AD331 reads EC in 5 ranges, AD431 provides TDS
readings in 5 ranges, and AD332 can measure both EC
and TDS. All models also read temperature.
The autoranging feature of the EC and TDS ranges
automatically sets the instrument to the scale with the
highest resolution.
Measurements are compensated for temperature ef-
fect automatically (ATC) or manually (MTC). It is
also possible to disable the temperature compensation
feature to measure the actual conductivity.
The temperature coefficient is user selectable.
These instruments also feature a measurement stabil-
ity indicator, GLP capability, and a user selectable ID
code to uniquely identify the instrument.
Moreover, AD332 includes PC interface and printing
function. Connect the meter to an external serial printer
with the following printer specifications:
• at least 16 characters / line
• baud rate 9600
• 9-pin RS232 input
INTRODUCTION
37

5
All models are supplied complete with:
•AD3005D/1conductivityprobewith built-in tempera-
ture sensor and 1 m cable
• Calibrationsolutions(100mlbottleeach):
• 1413 µS/cm, 12.88 mS/cm and 111.8 mS/cm for
AD331 and AD332
• 800 ppm, 6.44 ppt and 40 ppt for AD431
•1.5 VAA alkaline batteries (4 pcs)
•Holder for EC probe
•User manual
• Rugged carrying case
36
Press CFM to print the setup report or CAL to exit with-
outprinting.
Whenareadingislogged on-demand,
anautomaticprintoutwillprovidethe
followinginformationforEC or TDS:
LOG
Record No 001
Date 2000/01/01
Time 00:19
EC 83.2 mS
°C 25.0
PC INTERFACE (AD332 only)
Data transmission from the instrument to the PC can be
done with the ADSW10Windows®compatible software
(optional). ADSW10 offers graphing and on-line help
feature, and data can be exported to the most popular
spreadsheet programs for further analysis.
To connect the instrument to a PC, use the AD9551
serial communication cable (optional). Make sure that
the instrument is switched off and plug the cable to the
instrument RS232 socket and to the PC serial port.
Specifications:
Isolated 8-bit data transmission
Baud rate: 2400
Startbit: 1
Stopbit: 1
Paritybit: none

6
TECHNICAL DATA
EC Range 19.99 ; 199.9 ; 1999 µS/cm
(AD331 &AD332) 19.99 ; 199.9 mS/cm
TDS Range 9.99 ; 99.9 ; 999 ppm
(AD431 &AD332) 9.99 ; 99.9 ppt
Temperature Range (all models)
-9.9 to 120.0°C
Resolution 0.01 ; 0.1 ; 1 µS/cm
0.01 ; 0.1 mS/cm
0.01 ; 0.1 ; 1 ppm / 0.01 ; 0.1 ppt
0.1°C
Accuracy ±1% f.s. (EC and TDS)
(@20°C/68°F) ±0.5°C
EC Calibration Offset: 0.0 µS/cm;
(AD331 &AD332) Slope: 1 point with 6
memorized standards (84.0, 1413 µS/cm; 5.00,
12.88, 80.0, 111.8 mS/cm) or one custom value
TDS Calibration Offset: 0.0 ppm;
(AD431 only) Slope: 1 point with 4 memorized
standards (800, 1382 ppm; 6.44, 40.0 ppt)
or one custom value
35
WheninGLPmode, the printoutpro-
videsthefollowinginformation:
When in SETUP mode, the follow-
inginformationareprinted:
When exiting the setup mode, the instrument asks if the
setup report has to be printed. The “Prn” message will
be displayed together with the printer symbol ( ) and
the CFM tag blinking.
GLP
Instr ID 0005
Date 2000/01/01
Time 00:34
Cell 0.961
Cal Buffer
EC 8.00 mS
SETUP REPORT
Instr ID 0005
Date 2000/01/01
Time 00:34
TC 01.90 %
TCE Atc
Temp REF 25.0
TDS Factor 0.50
Cell 1.000
AutoOff OFF
Printer On
Version 1.0

7
Temperature Automatic or manual,
Compensation -9.9 to 120°C
Temperature Selectable
Coefficient from 0.00 to 10.00%/°C
TDS Factor Selectable from 0.40 to 1.00
(AD332 only) (default value: 0.50)
Reference Temperature
Selectable from 15.0 to 30.0°C
Log-on-demand Up to 250 samples
Probe (included) AD3005D/1
PC Interface & Printer (AD332 only)
RS232 port; external serial printer
Battery Type 4 x 1.5 V AA alkaline batteries
Battery Life Approx. 200 h of continuous use
Auto-Off User selectable: 5 min or disabled
Environment 0 to 50°C; RH max 95%
Dimensions 188 x 96 x 70 mm
Weight 460 g
34
PRINTING (AD332 only)
When connected to an external serial printer, a com-
plete set of information can be printed. Use the AD9551
serial communication cable (optional).
Printer specifications:
• at least 16 characters / line
• baud rate 9600
• 9-pin RS232 input
Datacanbeprinted on demand (frommeasurement,GLP
and SETUP modes) by pressing SHIFT+PRINT keys,
or automatically for log-on-demand mode.
Note: To cancel printing, press SHIFT+PRINT again.
While in EC measurement mode, the printout provides
thefollowinginformation.
Note: For TDS measurement mode, the TDS reading
willbeprinted.
Date 2000/01/01
Time 00:19
EC 83.2 mS
°C 25.0

To freeze the first stable reading on
the LCD, press the HOLD key from
measurement mode.
The “Auto” and “H” tags will blink on the LCD until the
readingisstabilized.
When the reading becomes
stable, the “Auto” and “H”
tagsstopblinkingandtheread-
ing is frozen.
Press the HOLD key again to return to normal mea-
surement mode.
8
FRONT AND TOP PANELS
33
• Press CFM to confirm deletion or SHIFT+HOLD
again to escape without deleting data.
Note: If no samples are stored in memory and a dele-
tion is attempted, the meter shows the "Zero"
message and then returns to measurement mode.
HOLD FUNCTION

DELETING STORED DATA
The meter allows to delete a single sample or all the
memory at one time.
To delete a single sample proceed as follows:
• Enter the viewing stored data mode and select the de-
sired sample number.
• Press the HOLD key. "dEL" and
"CFM"willstartblinking.
• Press CFM to confirm deletion or HOLD again to
escape without deleting data. When scrolling through
stored data, if a deleted sample is selected, the meter
will display the "nuLL" message.
To delete all data in memory:
• Enter the viewing stored data mode.
• PressSHIFT+HOLDkeys. "dEL" and"CFM"willstart
blinking and the "ALL" message is displayed on the
secondary LCD.
9
1. Probe holder
2. ON/OFF key, to turn the instrument ON and OFF
3. STORE/MRCL key, to store the measured data
and to recall stored data
4. CAL/SETUPkey, to enter/exit calibration and setup
mode
5. CFM key, to confirm values
6. SHIFT key, to activate the key alternate function
Press and hold first the SHIFT key and then the
second desired key
7. Down arrow/PAPER key, to manually decrease the
value of temperature or other parameters and to pull
out the printer paper
8. Up arrow/PRINT key, to manually increase the
value of temperature or other parameters and to ob-
tain a printout or cancel printing
9. RANGE(AD332)or NEXT(AD331&AD431)/“lock”
key, to select measurement unit or switch the fo-
cused data, and to freeze current range on the LCD
10. HOLD/GLP key, to freeze the first stable reading
on the LCD and to display Good Laboratory Prac-
ticeinformation
11. Liquid Crystal Display (LCD)
12. DIN connector for conductivity probe
13. RS232 port for serial printer or PC connection
32

• Year
• Time
• EC or TDS reading (only
dashes "----" means reading
out of range or probe not
connected)
• Temperature reading (only
dashes "----" means reading
out of range)
• To skip to next or previous sample, use the up or down
arrow key respectively. For example, if the up arrow
key is pressed while a sample reading is displayed, the
meter shows the reading of next sample.
• To return to measurement mode, press SHIFT+MRCL
at any time.
10
• The meter is supplied complete with four 1.5 V AA
alkaline batteries. Remove the battery cover, unwrap
the batteries and install them while paying attention to
their polarity (see “Battery Replacement” section for
details).
• Connect the supplied probe to the DIN connector and
tighten the threaded ring. Make sure the probe sleeve
is properly inserted.
OPERATIONAL GUIDE
31

INSTRUMENT START-UP
• Turn the instrument on by pressing
the ON/OFF key.
• 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” indi-
cation, then enters the measurement mode.
• 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 through the
“AoFF” setup item (see “Setup” section for details).
VIEWING STORED DATA
To retrieve memorized information,
press SHIFT and then MRCL keys.
The primary LCD displays the date (day & month) and
the secondary LCD shows the number of last stored
sample.
If no samples are stored into memory, the "ZERO" mes-
sage is displayed.
•Selectthedesiredsample number usingthearrowkeys.
If the up arrow key is pressed while the last sample is
displayed, the meter returns to the first sample.
• Press RANGE (or NEXT) to view
the remaining data for the selected
sample as shown in the next page.
1130

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 (AD332)
until the EC or TDS range is selected
on the LCD.
• Allow for the reading to stabilize. The primary LCD
displays the measurement in the selected range, while
the secondary LCD shows the temperature reading.
To store current reading into memory,
press STORE key from measurement
mode.
The LCD will display for a
few seconds the "Stor" mes-
sage together with the "Log"
tag and the sample number.
By pressing the STORE key a complete set of informa-
tion is memorized: date, time, EC or TDS and tempera-
ture readings.
Up to 250 samples can be stored into memory.
When the memory is full and
theSTOREkeyispressed,the
sample will not be stored and
the LCD will display the
"FULL" message.
In this case, it is necessary to delete the last sample or
all logged data to proceed.
12 29
LOG-ON-DEMAND

Calibration with custom solu-
tion.
Ifthecellconstant was changedaftercalibration(through
the“CELL”setup item),thisinformationis notdisplayed.
If RANGE (or NEXT) is pressed while the last param-
eterisdisplayed,the meter returnstomeasurementmode.
13
Notes:
•If the meter displays only dashes "----", the read-
ing is out of range.
•Ifthestabilityindicator(hourglasssymbol)blinks,
the reading is not stable.
•Make sure the meter is calibrated before taking
measurements.
•If measurements are taken successively in dif-
ferent samples, for accurate reading it is recom-
mendedtorinsethe probe thoroughlywithdeion-
ized water before immersing it into the next
sample.
•ForAD332:theTDS reading isobtainedbymul-
tiplying the EC value by the TDS factor (de-
fault: 0.50). This factor can be selected by the
user (0.40 to 1.00) through the "tdS" setup item
(see “Setup” section for details).
28
Notes:
• To exit GLP mode at any time, press SHIFT+GLP.
• If calibration has never been performed, after display-
ing the ID code, the meter will show the "no CAL"
message blinking. Press RANGE (or NEXT) or
SHIFT+GLP to return to measurement mode.
• For AD332, only last EC calibration data are avail-
able. No calibration data can be recalled for TDS. If
SHIFT+GLP are pressed from TDS measurement
mode, the meter will display the ID code only. Press
SHIFT+GLP again to return to measurement mode.
• GLP data are not affected by zero calibrations.

Last calibration date (day and
month).
Last calibration date (year).
Last calibration time.
Cell constant (K)
Calibration with standard so-
lution.
The EC and TDS scales are autoranging. The meter
automatically sets the scale with the highest possible
resolution.
BypressingSHIFTand “lock”keys,
the autoranging feature is disabled
and the current range is frozen on
the LCD.
TheµS,mS, ppm orppttag (depend-
ing 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.
14
AUTORANGING
27

15
TEMPERATURE COMPENSATION
Three options are available for temperature compensa-
tion:
1. Automatic (ATC): the EC probe features a built-in
temperature sensor, which allows automatic compen-
sation of the EC or TDS measurements.
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.
3. No compensation (No TC): 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 through the "tcE" setup item (see “Setup”
section for details).
• If the temperature compensation is active, mea-
surements are compensated using the tempera-
ture coefficient (default value 1.90 %/°C).
26
GOOD LABORATORY PRACTICE
Good Laboratory Practice (GLP) is a set of functions
that allows storage and retrieval of data regarding the
status of the system.
After a successful calibration, the meter automatically
stores the date and time of calibration, the used calibra-
tion solution and the resulting cell constant value.
All this information can be recalled by the user.
To view the last calibration data,
press SHIFT and then GLP keys.
Thefirstinformation appearingon
the LCD is the meter "id" code.
By repeatedly pressing RANGE
(or NEXT) key, all GLPdata are
displayed as shown in the next
pages.

16
The temperature coefficient can be modified
through the “tc” setup item (see “Setup” section
for details).
• If the temperature reading is out of the -9.9 to
120.0°C range and the ATC option is selected,
the temperature full scale value and the °C tag
will blink on the secondary LCD.
• 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 refer-
ence temperature of 25°C, when 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.
•For AD332, always set reference tempera-
ture to 25°C when measuring TDS.
25
Thefollowingtableliststhe setup items, theirvalidrange
and the factory settings (default):
Item
tc
tcE
rEF
tdS
CELL
AoFF
YEAr
DATE
TIME
id
vEr
Description
Temperature coefficient
Temp.compensation mode
Reference temperature
TDS factor (*)
Cell constant (K)
Auto-off feature
Printer Status (*)
Year
Date(DD.MM)
Time(hh:mm)
Meter identification code
Firmwarerelease
Validvalues Default
0.00to 10.00%/ ºC 1.90
Atc, Mtc, notc Atc
15.0to 30.0ºC 25.0ºC
0.40to 1.00 0.50
0.500to1.700 1.000
On,Off Off
On/Off Off
2000to2098 2000
01.01to31.12 01.01
01:01to23:59 00:00
0000to9999 0000
(*) For AD332only.

EC calibration is performed for AD331 and AD332;
TDS calibration is referred to AD431. For AD332, since
the TDS values are automatically derived from the EC
readings, no specific calibration for TDS is needed.
Selectable points for EC calibration are 0.00, 84.0 and
1413 µS/cm, 5.00, 12.88, 80.0 and 111.8 mS/cm.
Selectable points for TDS calibration are 800 and 1382
ppm (mg/l), 6.44 and 40.0 ppt (g/l).
• Rinse the probe with selected stan-
dard or deionized water, then im-
merseitintothe calibrationsolution.
Thesleeveholes mustbecompletely
submerged.
• Tap the probe repeatedly to remove any air bubbles
that may be trapped inside the sleeve.
• To enter calibration mode, press the
CAL key from the corresponding
measurement range.
Note: For AD332, pressing CAL
when TDS range is selected
has no effect.
Use the arrow keys to change the value.
If there is another part of the item to be set (e.g. month
in setting up the current date), press RANGE (or NEXT)
and the part to be changed will start blinking.
Use the arrow keys to change the value and then press
CFM to confirm.
Note: To escape without changing the previously set
value, press SHIFT and then SETUP before
confirming.
17
EC & TDS CALIBRATION
24

Setup mode allows to view and modify the instrument
parameters.
To enter setup mode, press SHIFT and then SETUP
key from measurement mode. The SETUP tag lights
up. The primary LCD will display the temperature coef-
ficient (default value 1.90%/ºC), while the secondary
LCD shows the code of the current setup item.
Select the desired setup item using the arrow keys, then
press CFM to select and edit the setup item. The cur-
rent value of the selected item starts blinking (if the pa-
rameter can be modified).
• For zero calibration, simply leave the dry probe in the
air. The "CAL" and "BUFFER" tags light up.
• The primary LCD displays the not calibrated EC or
TDS 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 blink-
ing. Press CFM to confirm calibration.
• The instrument displays the "Stor Good" message and
returns to measurement mode.
18 23
SETUP

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, use a calibration solution with
EC (or TDS) value close to the sample to be
measured.
• During calibration the meter compensates using
the 1.90%/°C coefficient. If the setup item "tc"
has been set to a different value, when exiting
calibration mode, the displayed value might be
different from the nominal standard value.
CUSTOM CALIBRATION
Calibration can be also performed with a custom cali-
brationsolution.
• Immersetheprobeintothecustomcalibrationsolution
and select the proper EC (or TDS) range. Press first
CAL to enter the calibration mode and then RANGE
(or NEXT) to enter the custom calibration.
Temperature reading can be manually fine-tuned as ex-
plained in this section.
Press SHIFT and CFM keys to enter
the temperature adjustment mode.
Both primary and secondary LCDs
will display the current temperature
reading for a few seconds, followed
by the default temperature reading.
Adjust the temperature value on the primary LCD using
the arrow keys. The maximum allowed adjustment is
±1.0ºC around the current reading.
Press CFM to confirm. The meter returns to measure-
ment mode and displays the new temperature.
Notes:
•Press SHIFT and CFM keys to escape without
changing.
• To enter temperature adjustment mode, the
probe must be connected and the meter must
be in ATC mode.
1922
TEMPERATURE ADJUSTMENT

• The "CAL", "BUFFER" and "Cal Point Custom" tags
light up. The primary LCD displays the not calibrated
temperature compensated reading, while the second-
ary LCD shows the temperature compensated read-
ing, factory calibrated with cell value k=1. The hour-
glasssymbolblinks.
• Using the arrow keys, adjust the reading displayed on
the primary LCD to the desired value.
• The maximum adjustment is ±40% around the value
displayed on the secondary LCD.
• When the reading is stable, the CFM tag starts blink-
ing. Press CFM to confirm calibration.
20 21
• The instrument displays the "Stor Good" message and
returns to measurement mode.
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.
•Thecellconstant valuecanbeset directlythrough
the"CELL"setupitem,withoutfollowingthecali-
bration procedure (see “Setup” section for de-
tails).
• Temperature reading is not used during custom
calibration.