ADWA AD1020 User guide

USER MANUAL

AD1000 and AD1020
pH/mV/ISE/Temperature
Bench Meters

www.adwainstruments.com

1

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].

2

TABLE OF CONTENTS

Introduction ............................................................... 4

Technical Data..........................................................6

Front and Rear Panels .............................................. 8

Operational Guide .................................................. 12

pH Calibration ........................................................ 19

Relative mV Calibration ......................................... 29

ISE Calibration (AD 1020 only) ............................ 30

Good Laboratory Practice ...................................... 35

Setup ....................................................................... 42

Logging/Storing ...................................................... 50

Hold ........................................................................58

Printing ................................................................... 59

Temperature Calibration
mV Calibration

(for technical personnel only) ................. 66

Analog Output ........................................................ 68

PC Interface ............................................................ 68

pH Electrode Conditioning & Maintenance. .......... 69

Troubleshooting Guide ........................................... 72

Electrodes, Probes and Solutions ...........................74

(for technical personnel only) 64

3

INTRODUCTION

AD1000 and AD1020 are professional bench meters
with ranges for pH, ORP (Oxidation Reduction Poten-

tial), ISE (AD1020 only) and temperature
measurements. Relative mV readings are also pro­vided.

Main features include:

• Up to 5-point calibration with 7 memorized buffers
(pH 1.68, 4.01, 6.86, 7.01, 9.18, 10.01 & 12.45) and
two custom buffers

• Calibration time-out alarm

• pH calibration using buffers with 0.001 resolution

• pH reading with manual or automatic temperature
compensation

• Log-on-demand (up to 50 samples) and automatic
logging (up to 1000 samples)

• Two selectable alarm limits

• User selectable logging interval mode

• Connection to an external serial printer with the
following specifications:

• at least 16 characters / line

• baud rate 9600

• 9-pin RS232 input

4

• Large easy-to-read LCD showing pH or ISE
(AD1020 only), mV and temperature readings si­multaneously, together with graphic symbols

• HOLD feature to freeze the stable reading on the
LCD

• GLP feature to view last calibration data for pH,
ISE and relative mV

• PC interface

Both models are supplied complete with:

• AD1131B refillable pH electrode with glass body,
BNC connector 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)

• Electrode holder

• 12 Vdc power adapter

• User manual

5

TECHNICAL DATA

Range -2.00 to 16.00 pH / -2.000 to 16.000 pH

±2000 mV

0.001 to 19999 ppm (AD1020 only)

- 20.0 to 120.0°C (- 4.0 to 248.0°F)

Resolution 0.01 pH / 0.001 pH

0.1 mV
(±999.9 mV) / 1 mV (outside) 0.001 ppm
(0.001 to 9.999) 0.01
ppm (10.00 to 99.99) 0.1
ppm (100.0 to 999.9) 1
ppm (1000 to 19999)
(AD1020 only)

0.1°C (0.1°F)

Accuracy ±0.01 pH / ±0.002 pH

(@25°C/77°F) ±0.2 mV up to ±699.9 mV

±0.5 mV up to ±999.9 mV

± 2 mV outside

±0.5% f.s.
ISE (AD1020 only)
±0.4°C (±0.7°F) (excluding probe error)

Relative mV Offset ± 2000 mV

pH Calibration Up to 5 point calibration,

with 2 custom and 7 standard buffers

(pH 1.68, 4.01, 6.86, 7.01, 9.18, 10.01, 12.45)

6

ISE Calibration Up to two-point calibration,

(AD1020 only) 5 standard solutions available

(0.1, 1, 10, 100, 1000 ppm)

Temperature Manual or automatic,
Compensation -20.0 to 120.0°C (-4.0 to 248.0°F)

pH Electrode AD1131B

Temperature Probe AD7662

Logging Interval 5 seconds to 180 minutes

Printer External serial printer

PC Interface USB port

Analog Output ± 2000 mV

Input Impedance 1012 Ohm

Environment 0 to 50°C (32 to 122°F)

RH max. 95% non-condensing

Power Supply 12 Vdc adapter

Dimensions 230 x 180 x 50 mm

Weight 1.8 kg

7

FRONT AND REAR PANELS

Front Panel

8

Rear Panel

1. Power adapter socket

2. Reference input socket

3. BNC connector for pH, ORP or ISE electrodes

4. Temperature probe socket

5. Analog output sockets

6. USB port for PC connection

7. RS232 port for external serial printer connection

9

Keyboard

1. HOLD key, to freeze reading on the LCD

2. PRINT key, to obtain a printout or cancel printing

3. PAPER key, to pull out the external printer paper

4. ON/OFF key, to turn the instrument ON and OFF

5. Left arrow key, to toggle between parameters while
in MEM RCL or SETUP mode (backwards), to
toggle between absolute mV and temperature while
in relative mV mode and between pH buffer and
temperature while in pH calibration mode

10

6. Up arrow key, to manually increase the value of
temperature or other parameters

7. CLEAR key, to clear calibration or logged data

8. RANGE key, to select measurement unit or switch
focused data

9. SHIFT key, to activate the second function key

10. NUM LOCK key, to activate numerical keys (0 to 9, ±)

11. Down arrow key, to manually decrease the value
of temperature or other parameters

12. MEM RCL key, to view logged data

13. CFM/GLP key, to confirm values and to display
GLP (Good Laboratory Practice) information

14. STORE key, to store measured data

15. CAL/SETUP key, to enter/exit calibration mode
and to enter/exit SETUP mode

16. INTVLOG key, to start/stop logging

17. Right arrow key, to toggle between parameters
while in MEM RCL or SETUP mode (forwards), to
toggle between absolute mV and temperature while
in relative mV mode and between pH buffer and
temperature while in pH calibration mode

11

Note: To select second function, press first SHIFT and

then the desired key. The SHIFT tag will appear
on the LCD until the desired key is pressed.
To leave second function mode, press SHIFT
again.

OPERATIONAL GUIDE

CONNECTIONS

• Plug the 12 Vdc adapter into the power supply socket.

Note: These instruments feature a non-volatile memory

to keep calibration data and all meter settings
even when unplugged.

12

• Attach the pH, ORP or ISE (AD1020 only) electrode

and the temperature probe to the appropriate sockets
on the rear panel. For electrodes with separate refer­ence, connect the reference to the proper input socket.

• Attach the analog output and serial cables to the con-

nectors on the back of the instrument.

INSTRUMENT START-UP

Turn the instrument on by pressing the ON/OFF button.
All LCD tags are displayed and a beep is heard (if beep

is ON) while the instrument performs a self test.

The instrument will display the date on the primary LCD
and the time on the secondary LCD, and then it will
enter the same measurement range as it was at power
off.

13

pH MEASUREMENTS

Make sure the instrument has been calibrated before
taking pH measurements.

• Press RANGE to enter pH range.

P

ress RANGE again to change the pH

measurement resolution.

• Immerse pH electrode tip and tem-

perature probe approximately 4 cm into
the solution to be tested. Allow for the
electrode to stabilize and put the tem­perature probe tip as close as possible
to the pH electrode.

• The pH reading is displayed on the primary LCD and

the temperature value on the secondary LCD.

• If measurements are taken successively in different

samples, it is recommended to rinse the electrode thor­oughly with deionized or tap water and then with some

14

of the next sample. This will prevent cross contami­nations and condition the electrode before immersing
it into the solution to be tested.

• 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 Compensation) 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 sample solution temperature is known, MTC

(Manual Temperature Compensation) can be per­formed by disconnecting the temperature probe. The
display will show the default temperature of 25°C (or
77°F) or the last temperature reading with the °C (or
°F) tag blinking.

• The temperature can be adjusted using the arrow keys

(from -20.0°C to 120.0°C or from -4.0°F to 248.0°F).

15

ORP (mV) MEASUREMENTS

Oxidation-reduction potential (REDOX) measurements
provide 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 the mV range.

• Immerse the ORP electrode tip 4 cm into

the solution to be tested and wait a few
seconds for the reading to stabilize.

• The instrument displays the mV reading on the pri-

mary LCD and the temperature on the secondary LCD.

• If reading is out of range, the closest full-scale value

will blink on the primary LCD.

16

RELATIVE mV MEASUREMENTS

To enter relative mV mode, press RANGE. The relative
mV reading will be displayed on the primary LCD and
the current temperature value on the secondary LCD.

Note: Press the right or left arrow key to toggle be-

tween temperature and absolute mV reading on
the secondary LCD.

The relative mV reading is equal to the difference be­tween the absolute mV input value and relative mV off­set established in the relative mV calibration.

17

ION MEASUREMENTS (AD1020 only)

•P

ress RANGE to enter the ISE mea-

surement mode.

• Immerse the ISE electrode tip 4 cm into

the solution to be tested and wait a few
seconds for stable reading.

• The instrument displays the ppm reading on the pri-

mary LCD and the temperature on the secondary LCD.

18

TEMPERATURE MEASUREMENTS

Connect the
the appropriate socket on the rear panel.

Immerse the temperature probe into the solu­tion and allow the reading to stabilize.

Notes:

• The temperature can be displayed in Celsius (°C ) or

in Fahrenheit degree (°F). See “Setup” section for
details.

• The temperature probe must be measured in the same

sample together with the pH or ISE electrode.

AD7662 temperature probe to

pH CALIBRATION

The instrument should be recalibrated:

• Whenever the pH electrode is replaced

• At least once a week

• After testing aggressive chemicals

• If the CAL DUE message is blinking during measure-

ment

PREPARATION

Pour small quantities of the buffer solutions into clean
beakers. If possible, use plastic beakers to minimize any
EMC interferences.

19

For accurate calibration and to minimize cross-contami­nation, use two beakers for each buffer solution: the first
one for rinsing the electrode and the second for calibra­tion.

If you are measuring in the acidic range, use pH 4.01 or

1.68 as second buffer. If you are measuring in the alka-

line range, use 10.01/9.18 or 12.45 as second buffer.

For extended range measurements (acidic and alkaline),
perform a five-point calibration by selecting five of the
available buffers.

PROCEDURE

If 0.001 pH resolution is selected, each selected stan­dard buffer value can be updated accordingly with the
value of the production lot certificate at 25°C (77°F).
From calibration mode, when a standard pH buffer with

0.001 resolution is selected, press SHIFT and then

SETUP. The buffer value will start blinking and it can
be changed within a ±0.020 pH window using the ar­row keys.

The instrument allows to choose among 7 memorized
pH buffers (pH 1.68, 4.01, 6.86, 7.01, 9.18, 10.01, 12.45)
and 2 custom buffers.

Custom buffers allow the user to calibrate using a solu-

20

tion with a pH value different from a standard one. Up to
two custom buffers can be set through the setup menu.
The custom buffer value can also be changed within a
±1.0 pH window around the set value.

For accurate measurements it is recommended to per­form a five-point calibration. However, at least a two­point calibration is suggested.

The instrument will automatically skip the buffers already
used and require a minimum difference of 0.2 pH unit
between two buffers used for calibration.

A new calibration will override existing stored calibra­tion data. The slopes adjacent to the calibration points
will be reevaluated.

If the new calibration point has no correspondence in
the existing stored calibration data, it is simply added or
the instrument will ask which buffer will be replaced by
the current one.

If at least a two-point calibration has been performed
and an offset correction of the electrode is desired, keep­ing unchanged the existing slopes, perform a one-point
calibration selecting the “OFFS” option in the setup
menu. If the “Pnt” option is selected, the slopes adja­cent to the calibration points will be reevaluated.

21

FIVE-POINT CALIBRATION

• Immerse the pH electrode and the tem-

perature probe approximately 4 cm into
a buffer solution of your choice (pH

1.68, 4.01, 6.86, 7.01, 10.01, 12.45, cus­tom buffer 1 or 2, if set) and stir gently.
The temperature probe should be close
to the pH electrode.

• Press CAL and the instrument will dis-

play the measured pH on the primary
LCD and the “7.01 pH” buffer on the
secondary LCD, together with CAL and
“Cal Point 1” tags.

• If necessary, press the up and down arrow keys to

select a different buffer value.

22

• The hourglass tag will blink on the LCD until the read-

ing is stable.

• When the reading is stable and close to

the selected buffer, the CFM tag ap­pears. Press the CFM key to confirm.

• The calibrated value is then displayed on the primary

LCD and the secondary LCD will display the second
expected buffer value, together with CAL and “Cal
Point 2” tags.

• After the first calibration point is confirmed, immerse

the pH electrode and the temperature probe approxi­mately 4 cm into the second buffer solution and stir
gently. The temperature probe should be close to the
pH electrode.

• If necessary, use the arrow keys to select a different

buffer value.

• The hourglass tag will blink on the LCD until the read-

ing is stable.

23

• When the reading is stable and close to the selected

buffer, “CFM” tag appears.

• Press CFM key to confirm. The cali-

brated value is then displayed on the pri­mary LCD and the secondary LCD will
display the third expected buffer value.

• After the second calibration point is confirmed, im-

merse the pH electrode and the temperature probe
approximately 4 cm into the third buffer solution and
stir gently. The temperature probe should be close to
the pH electrode.

• If necessary, use the arrow keys to select a different

buffer value.

• The hourglass tag will blink on the LCD until the read-

ing is stable.

• When the reading is stable and close to the selected

buffer value, the CFM tag appears. Press the CFM
key to confirm.

• The calibrated value is then displayed on the primary

LCD, while the secondary display will show the fourth
expected buffer value.

• After the third calibration point is confirmed, immerse

the pH electrode and the temperature probe approxi­mately 4 cm into the fourth buffer solution and stir

24

gently. The temperature probe should be close to the
pH electrode.

• If necessary, use the arrow keys to select a different

buffer value.

• The hourglass tag will blink on the LCD until the read-

ing is stable.

• When the reading is stable and close to the selected

buffer value, the CFM tag appears. Press the CFM
key to confirm.

• The calibrated value is then displayed on the primary

LCD, while the secondary display will show the fifth
expected buffer value.

• After the fourth calibration point is confirmed, immerse

pH electrode and temperature probe approximately 4
cm into the fifth buffer solution and stir gently. The
temperature probe should be close to the pH electrode.

• If necessary, use the arrow keys to select a different

buffer value.

• The hourglass tag will blink on the LCD until the read-

ing is stable.

• When the reading is stable and close to the selected

buffer value, the CFM tag appears. Press the CFM
key to confirm.

25

• The instruments store the calibration values and re-

turn to normal measurement mode.

FOUR, THREE, or TWO-POINT PROCEDURE

Proceed as described in the “Five-point calibration” sec­tion and press CAL after the appropriate accepted cali­bration point. The instrument will memorize the calibra­tion data and return to normal measurement mode.

ONE-POINT CALIBRATION

• Two setup options are available: “Pnt” and “OFFS”.

• If the “Pnt” option is selected, the adjacent slopes will

be reevaluated.

• If the “OFFS” option is selected, an electrode offset

correction is performed keeping unchanged the exist­ing slopes.

• Proceed as described in the “Five-point calibration”

section and press CAL after the first accepted cali­bration point. The instrument will memorize the single
point calibration data and return to normal measure­ment mode.

26

Notes:

• During calibration press RANGE or the right or left

arrow keys to toggle between pH buffer and tempera­ture reading on the secondary LCD.

• Each time a buffer is confirmed, the new calibration

parameters replace the old data of the corresponding
buffer.

• If current confirmed buffer has no correspondence in

the stored calibration, it will be added to the existing
calibration data. If the stored calibration is a five-point
procedure, the instrument will ask which buffer should
be replaced.

Use the arrow keys to select the buffer to be replaced,
then press CFM to confirm or CAL to exit calibration
without replacing.

27

CUSTOM BUFFERS

If at least one custom buffer was set in SETUP menu, it
can be selected for calibration using the arrow keys.
Press SHIFT and then SETUP key if you want to adjust
the buffer value. The buffer value, displayed on the sec­ondary LCD, will start blinking.

Use the ARROW keys to change the buffer value.

After about 5 seconds the last change has been per­formed, the buffer value is updated and the meter exit
from the changing mode. Press SHIFT and then SETUP
key if you want to change again the value.

Note: Custom buffer value can be adjusted in a ±1.00

pH window, around the set value.

28

CLEAR CALIBRATION

If the CLEAR key is pressed at any time during
calibration, the “CLEAR CAL” tag lights up and the
“donE” message is displayed on the secondary LCD.

All previous calibrations are cleared and the instrument
continues the procedure. The points already confirmed
for the current calibration are not deleted.

Note: If CLEAR is pressed during the first calibration

point, the instrument returns to measurement
mode.

RELATIVE mV CALIBRATION

• Press CAL from relative mV measurement mode.

The relative mV value is displayed on the primary LCD
and the absolute mV value on the secondary LCD.

• If desired, change the displayed relative mV value

using the arrow or the numerical keys (press NUM
LOCK to activate them).

Notes:

• Press RANGE to change the resolution of the
displayed value, if possible (e.g. 199.9 will change
to 1999, while 19.9 will not change).

• If CLEAR is pressed outside NUM LOCK
mode, the displayed value is set to 0.0 mV.

29

• Press NUM LOCK again to leave the numeri­cal keys.

• When the reading is stable and the relative mV offset
is within the offset window (±2000 mV), the CFM tag
will be displayed.

• Press CFM to confirm relative mV calibration. The
instrument will return to measurement mode.

• If the absolute mV reading is out of range or the rela­tive mV offset is outside the offset window, the
WRONG tag will blink.

procedure the input value or the relative mV offset
has to be changed.

To complete the calibration

ISE CALIBRATION (AD 1020 only)

For greatest accuracy, it is recommended to calibrate
the instrument frequently.
Due to electrode conditioning time, keep the electrode
immersed for a few seconds in the solution to be tested.
To make the calibration a simple and error-free proce­dure, the user will be guided step by step during calibra­tion with easy messages on the display.

30

PREPARATION

• Set the proper ion charge through the setup item
“IonCG”.

Note: If the “undF” option is selected in setup menu,

the calibration must be a two-point procedure.
If the user try to exit the calibration mode after
confirming the first point, the “----” message ap­pears on the LCD.

• Pour small quantities of the standard solutions into clean
beakers. If possible, use plastic beakers to minimize
any EMC interferences.

• For accurate calibration and to minimize cross-con­tamination, use two beakers for each standard solu­tion, the first one for rinsing the electrode and the sec­ond for calibration.

PROCEDURE

One and two-point procedures are available, with five
memorized standard solutions: 0.1, 1.0, 10, 100, 1000 ppm.

• Press RANGE to enter the ISE mode.

31

TWO-POINT CALIBRATION

• Immerse the ISE electrode approxi­mately 4 cm into the first standard so­lution and stir gently.

• Press CAL key. The primary LCD will
display the ppm value using current off­set and slope.

• The “CAL” and “Cal Point 1” tags light up, and the

0.1 ppm standard value is shown on the secondary
LCD.

• If necessary, use the arrow keys to select a different
standard solution.

• The hourglass symbol will blink on the LCD until the
reading becomes stable.

• When the reading is stable and close to the selected
standard, the CFM tag starts blinking.

32

• Press CFM to confirm calibration.

• The calibrated value will be displayed
on the primary LCD and the second
expected standard solution on the sec­ondary LCD.

Note: The instrument will automatically skip the stan-

dard value used for the first point.

• After the first calibration point is confirmed, immerse
the ISE electrode approximately 4 cm into the second
standard solution.

• If necessary, use the arrow keys to select a different
standard solution.

• The hourglass symbol will blink on the LCD until the
reading becomes stable.

• When the reading is stable and close to the selected
standard, the CFM tag starts blinking.

• Press CFM key to confirm calibration. The instrument
stores the calibration data and returns to normal mea­surement mode.

33

Notes:

• If the mV value is out of the ±2000 mV range,
the “WRONG” and “BUFFER” tags are dis­played. Check if the correct standard has been
used, or refresh the electrode by following the
maintenance procedure described on page 69.
If necessary, change the standard solution or the
electrode.

• If the ion charge is not specified (“undF” se­lected in setup menu), the slope window is be­tween ±20 mV and ±105 mV. If a ion charge
value is set, the slope value is between 50% and
120% of the default slope for the corresponding
ion charge.
Default slope value (mV/decade):

-59.16 (monovalent anion) - ion charge is -1

59.16 (monovalent cation) - ion charge is 1

-29.58 (divalent anion) - ion charge is -2

29.58 (divalent cation) - ion charge is 2
100 - ion charge is “undF”

• To reset to the default values and clear calibra­tion data, press the CLEAR key during calibra­tion. The instrument will display the “CLR” mes­sage and return to measurement mode.

34

ONE-POINT CALIBRATION

• To perform a single point calibration,
press CAL after the first calibration
point has been confirmed.

The instrument will store the one-point calibration data
and return to normal measurement mode.

GLP (GOOD LABORATORY PRACTICE)

GLP is a set of functions that allows data storage (and
retrieval) about the electrode status and maintenance.

All data regarding pH, relative mV and ISE calibrations
are stored in the instrument memory.

CALIBRATION TIME-OUT ALARM

The instrument allows to set the number of days (from
1 to 7) before the next required pH calibration. The de­fault setting is “OFF” (disabled).

At start-up the instrument checks if the calibration time­out has expired. If yes, the “CAL DUE” message blinks
to advise the user that a new calibration is required.

Note: If the instrument was not calibrated or all cali-

bration data were cleared, the “CAL DUE”
message is displayed even if the feature is dis­abled in the setup menu.

35

LAST pH CALIBRATION DATA

The last pH calibration data are stored automatically after
a successful calibration.

To view the pH calibration data, from pH measurement
mode press SHIFT and then GLP key. The instrument
will display the date (yyyy.mm.dd) of the last calibra­tion.

Use the up arrow key to view all calibration parameters
in the following sequence:

• Time (hh:mm) of the last calibration.

36

• pH calibration offset value.

• pH calibration slope (the GLP slope is the average of
the calibration slopes; the percentage is referred to
the ideal value of 59.16 mV/pH).

• Calibration buffers in the order used for calibration,
together with the corresponding warnings.

37

Notes:

• The “OLd” message displayed beside a buffer
value means that this buffer was not used dur­ing last calibration. Press SHIFT and then
SETUP key to see the old calibration date (or
time, if old calibration date is the same as the
last procedure).

• Each buffer is displayed with the resolution used
during calibration.

• The “no bUF” message means that calibration
was performed at less than five points.

• Calibration time-out alarm status. The display shows
“OFF” if the feature is dis­abled, or the days remain­ing before the calibration
alarm will be activated
(e.g. 5 days), or after the
calibration is expired (e.g.

-3 days).

• The instrument ID.

38

LAST ISE CALIBRATION DATA (AD 1020 only)

Last ISE calibration data are stored automatically after
a successful calibration.

To view the ISE calibration data, from ISE measure­ment mode press SHIFT and then GLP key. The instru­ment will display the date (yyyy.mm.dd) of last calibration.

Use the up arrow key to view all logged calibration pa­rameters in the following sequence:

• ISE calibration time as in pH GLP mode.

• ISE calibration slope (mV/decade) on the primary LCD
and ion charge on the secondary LCD.

• First ISE calibration buffer on the primary LCD and
corresponding mV value on the secondary LCD.

39

• Second ISE calibration buffer on the primary LCD
and corresponding mV value on the secondary LCD.

Notes:

• If a single point calibration is performed after a
two-point calibration, the instrument will keep
the old slope.

• The “no bUF” message means that calibration
was performed at one point.

• The instrument ID as in pH GLP mode.

LAST RELATIVE mV CALIBRATION DATA

Last relative mV calibration data are stored automati­cally after a successful calibration.

To view the relative mV calibration data, from relative
mV measurement mode press SHIFT and then GLP key.
The instrument will display the date (yyyy.mm.dd) of
the last calibration.

40

Use the up arrow key to view all logged calibration pa­rameters in the following sequence:

• Relative mV calibration offset and time (hh:mm) as in
pH GLP mode.

• Instrument ID as in pH GLP mode.

Notes:

• Press SHIFT and then GLP key at any moment
to return to normal measurement mode.

• If calibration has not been performed, the “no
CAL” message will blink on the LCD.

41

SETUP

Setup mode allows viewing and modifying the following
parameters:

• Calibration time-out alarm

• One-point calibration behavior

• Custom buffer 1

• Custom buffer 2

• Ion charge (AD1020 only)

• Alarm high limit

• Alarm low limit

• Start condition of automatic logging

• End condition of automatic logging

• Logging interval

• Temperature measure unit

• Current date (yyyy.mm.dd)

• Current time (hh:mm)

• Printer status

• Keyboard beep status

• Baud rate for serial communication

• Command prefix for serial communication

• Instrument ID

42

• To enter SETUP mode, from measurement mode press
SHIFT and then SETUP.

• Press CAL to change the item
value. The selected item (e.g.
hour, while setting the time)
and “CFM” tag will blink.

• Use the arrow keys to scroll the available values or
insert the desired value with the numerical keys.

Note: To activate the numerical keys, press NUM

LOCK. The SHIFT tag will blink. The new in­troduced digit is always the last one and all pre­vious digits will shift to left.

• To delete the digits press CLEAR key before entering
the NUM LOCK mode.

• If another item has to be set
(e.g. minutes), press RANGE
or left/right arrow key, and the
item will start blinking.

• Use the arrow keys to scroll the available values or
insert the desired value with the numerical keys.

• Press CFM to confirm or CAL to escape.

• Use the arrow keys to select the next/previous pa­rameter.

43

• Press SHIFT and then SETUP to exit the setup menu
at any time.

• When the printer status is “ON”, the instrument asks
for printing a setup report. Press CFM to print the
report or CAL to return the normal measurement mode.

The table on next page lists all available setup param­eters, their valid values and the factory settings (default).

44

Item

CAL DUE
1 Pnt
Custom C1
Custom C2
IonCG
AL.HI

AL.LO

Strt

End

Interval
tEMP
Date

Time

bEEP
bAUd

PrEF
In Id

Description

Alarm time-out
1-point cal. behavior
Custom buffer 1
Custom buffer 2
Ion charge
Alarm high limit

Alarm low limit

AutoLOG
start condition

AutoLOG
end condition

AutoLOG interval
Temperature unit
Date (yyyy.mm.dd)

Time (hh:mm)
Printer status
Beep status
Baud rate

Command prefix
Instrument ID

Valid values

OFF or 1 to 7 days
Pnt, OFFS

-2.00 to 16.00 pH

-2.00 to 16.00 pH
undF, -2, -1, 1, 2
pH, mV, Rel mV

ranges
pH, mV, Rel mV

ranges
See time/date or

btn
dur, SAMP, rdG

5 sec to 180 min
°C, °F

2000.01.01
to 2099.12.31

00:00 to 23:59
ON, OFF
ON, OFF
600, 1200, 2400,

4800, 9600
0 to 47
0000 to 9999

Default

OFF
Pnt
no
no
undF
no

no

btn

dur

5 sec
°C

OFF
OFF
2400

16
0000

45

Notes:

• The custom buffers can be set only with 0.001
resolution. If 0.01 pH resolution is selected dur­ing calibration, the displayed custom buffer value
will be a rounded one.

• While in setup changing mode for items calibra­tion alarm time-out, custom buffer, alarm limits,
start and stop condition, press CLEAR to set
the selected item to the default value.

• Refer to the table below to select the correct ion
charge for each ion type (AD 1020 only):

ION CHARGE ION TYPE

-2 (divalent anion) S, CO

-1 (monovalent anion) F, Cl, Br, I, CN, SCN, ClO4, NO

+1 (monovalent cation) H, Na, K, Ag, NH

+2 (divalent cation) Mg, Ca, Ba, Cd, Cu, Pb

undf undefined ion

3

4

3

46

ALARM SETUP

• Select one of the alarm items. The displayed value
will be the one previously set.

• Press RANGE to select the range for the alarm and
the corresponding range tag will blink.

• Press the CAL key to enter setup changing mode. Set
the new value using the arrow or the numerical keys.

Notes:

• While in setup changing mode, press RANGE
to select a different resolution, if possible (e.g.
if 199.9 is displayed, by pressing RANGE the
value will change to 1999; if 19.9 is displayed,
nothing will happen if pressing RANGE).

• Pressing CLEAR key, the displayed item will be
reset to the default value (“no”).

• Press NUM LOCK key to activate the numeri­cal keys. The SHIFT tag will blink.

• Press CFM to confirm the set value.

While in normal measurement mode:

• If only the “AL.LO” item is set, the instrument will
beep when the reading is below alarm low limit.

• If only the “AL.HI” item is set, the instrument will
beep when the reading is above alarm high limit.

47

• If both alarm items are set, the instrument will beep
when the reading is above alarm high limit or below
alarm low threshold.

Note: If the “AL.HI” value is minor than or equal to

the “AL.LO” value, the WRONG tag will blink.

AutoLOG SETUP

AutoLOG Start Condition

• Select the ‘Strt’ item. The previously set automatic
logging start condition will be displayed. The default
value is ‘btn’ (button), i.e. start with key pressed.

• To view the set date, press and hold the RANGE key
while in setup viewing mode, when time is displayed.

• If the CAL key is pressed while in setup viewing mode,
the start time is displayed.

Note: Pressing CLEAR while in setup changing mode,

the start condition will be reset to the default
value (“btn”).

AutoLOG End Condition

• Select the “End” item. The previously set automatic
logging end condition will be displayed. The following
options will be available: “dur” (duration), “SAMP”
(sample number), “rdG” (reading limit).

48

• Pressing RANGE while in setup viewing mode, the
instrument will display one of the following options:
“dur”, “SAMP’, “rdG” & “pH”, “rdG”& “mV”, “rdG”
& “Rel mV” and “rdG” & “ppm”.

• Press the CAL key and the instrument will enter the
setup changing mode and display one of the following
messages:

• “dur” on the secondary LCD and the duration value

(hh:mm) on the primary LCD, together with the
“TIME” tag. The duration can be set from 1 minute
to 199 hours and 59 minutes.

• “SAMP” on the secondary LCD and the sample

number on the primary LCD.

• “rdG” on the secondary LCD and the last set limit

value on the primary LCD, with the corresponding
range tag blinking.
To set a different resolution, press RANGE while in
setup changing mode.

The automatic logging will start accordingly with the se­lected option for the “Strt” item: by pressing INTVLOG
if the selected option is “btn” (button), or when the set
starting time is reached.

The automatic logging will stop accordingly with the se­lected option for the “End” item or when INTVLOG
key is pressed.

49

LOGGING / STORING

This feature allows the user to log automatically pH &
Rel mV or ISE & Rel mV measurements, together with
the temperature reading. All logged data can be trans­ferred to a PC through the USB port.

The maximum logging space is 1000 record locations
(samples). This can be divided from 1 up to 50 lots (one
lot can use all the free space). The lot ID can be from 1
to 99 (after 99 it restarts from 1). A maximum of 50 lots
can be stored, even if there is free space available.

Note: When the logged lots are more than one, the to-

tal number of samples can be less than 1000,
because the logging memory is divided in pages
of 20 samples each.

The logging interval can be set from 5 seconds to 180
minutes (see “Setup” section for details). Up to 50 record
locations are also provided for the log-on-demand.

LOG-ON-DEMAND
(LOGGING/STORING THE CURRENT DATA)

To store the current reading into the
instrument memory, press STORE
from normal measurement mode.

50

The instrument will display the current date on the pri­mary LCD and the record number on the secondary
LCD, together with the ‘LOG’ tag blinking for a few
seconds. Then the number of free locations is shown.

If there are less than 6 memory locations left, the record
number and the “Lo” message will blink for a few sec­onds to alert the user, and then the number of free loca­tions is displayed.

If the logging space is full, the “FULL LOC” message
will be displayed for a few seconds together with the
“LOG” tag blinking, followed by the “FrEE 0” message.

51

The instrument returns to normal measurement mode.

AUTOMATIC LOGGING

The user-selectable automatic logging options make these
instruments very useful in a wide range of applications.

• Start pressing the INTVLOG key or set starting time/
date. Stop after a set duration.

• Start pressing the INTVLOG key or set starting time/
date. Stop when a set value is reached.

• Start pressing the INTVLOG key or set starting time/
date. Stop when a set sample number is reached.

When the automatic log­ging starts, the instrument
will display for a few sec­onds the lot number and the
auto-log interval, together
with the “AutoLOG” tag.

52

Notes:

• For different automatic logging modes, the log­ging starts/stops automatically after the set start/
stop condition is reached.

• The “AutoLOG” tag will blink if one of these
modes is selected and the start condition is not
reached.

After the data logging is started, the current value is
displayed on the primary LCD and the temperature on
the secondary LCD, together with the “AutoLOG” tag.

To stop the automatic logging, press the INTVLOG key
at any time. The instrument will display for a few sec­onds the lot number, the sample number and the
“AutoLOG” tag, and then it will return to normal mea­surement mode.

53

Notes:

• If printer is ON and the logging interval is at least
30 seconds, each logged sample is printed.

• If the pages for automatic logging are full, the
“FULL LOC” message is displayed, as in log­on-demand mode.

VIEWING LOGGED DATA

To retrieve stored information, press MEM RCL from
normal measurement mode. If no data were logged, the
display will show the “no rEC” message.

Otherwise, the instrument displays the memorized pH,
Rel mV or ppm reading, and the lot number.

54

Pressing SHIFT and then SETUP key while in MEM
RCL mode, the secondary LCD will toggle between the
lot and the record number. Use the arrow keys to select
a different lot or record.

Press RANGE or the right arrow key to scroll all logged
parameters, displayed as shown in the table below:

Parameter Primary LCD Secondary LCD

mV mV reading Temperature

TIME Hour and minutes Seconds

DATE Year Month and day

OFFSET Offset value Lot or record number

SLOPE Slope value Lot number or

ion charge (ISE range)

55

Notes:

• To view the previous logged parameter, press
the left arrow key.

• In Rel mV MEM RCL mode the offset value is
not available and the display shows ‘----’.

• The record number is an identification number
inside a lot.

After scrolling all logged parameters, the meter displays
the “dEL” message together with the lot number.

Notes:

• Pressing SHIFT and then SETUP key, the in­strument toggles between lot and record num­ber (log-on-demand only) or all lots.

• The “LdM” message on the secondary LCD in­dicates that data has been stored in log-on-de­mand mode.

56

• Press CLEAR to delete the selected lot/record or all
lots.

Note: Positions remain free in the log-on-demand lot

by deleting the last logged sample or all lots.

• If the “dEL All” option was selected, all logged data
are deleted and the instrument returns to normal mea­surement mode.

• Press MEM RCL at any time to return to measure­ment mode.

57

HOLD

To freeze a stable reading on the LCD, press HOLD
key from normal measurement mode.

The “Auto” and “H” tags will blink on the LCD until the
reading stabilizes.

When the reading is stable, the “Auto” and “H” tags
stop blinking and the reading is frozen.

Press HOLD key again to return the normal measure­ment mode.

Note: Pressing RANGE the instrument will skip to the

displayed range, without leaving the HOLD
mode. The STORE key also holds HOLD mode.
Pressing MEM RCL key, SHIFT and then
SETUP or GLP, the instrument leaves the HOLD
mode and performs the selected function.

58

PRINTING

When connected to an external serial printer, a com­plete set of information can be printed.

Printer specifications:

• at least 16 characters / line

• baud rate 9600

• 9-pin RS232 input

Data can be printed on demand (from measurement, GLP
and SETUP modes) by pressing PRINT key or auto­matically (from automatic logging and log-on-demand
modes).

Automatic data printing from automatic logging mode
can be done only if the automatic logging interval is greater
than 30 seconds and the printer status is set to ON.

Note: To cancel printing, press PRINT again.

While in pH measurement mode,
the printout provides the following
information:

59

Date 2004/01/01
Time 02:25:17
pH 7.01
mV -23.2

°C 26.3

Note: For ISE (AD1020 only) and relative mV mea-

surement modes, the ppm and Rel.mV values
will be printed.

When in GLP mode, the printout provide the following
information:

• For pH range:

GLP pH
Instr ID 0003
Date 2004/01/01
Time 01:04:32
Cal Time Out OFF
Offset -22.9mV
Slope 100.0%
Cal Buffers:
pH 7.01

• For relative mV range:

• For ISE range

(AD1020 only):

GLP Rel mV
Instr ID 0003
Date 2004/01/01
Time 02:27:35
Channel pH
Off.RelmV -23.3

GLP Ion
Instr ID 0003
Date 2004/01/03
Time 02:30:04
Slope -59.3
Ion Charge 1
Cal Buffers
ppm 0.1
mV -320.6
ppm 100
mV -158.4

60

When in SETUP mode, the following information can be
printed:

• If PRINT is the first key pressed
after entering the setup mode, a
setup table of contents will be
printed.

INSTRUMENT SETUP
Calibration
Alarm Time Out
One point cal
behavior
pH Custom Buf. 1
pH Custom Buf. 2
Ion Charge
Beep Alarms:
Alarm high
Alarm low
AutoLOG:
Start condition
End condition
Interval
Temperature unit
Current Date
Current Time
Printer ON/OFF
Beep ON/OFF
Baud rate
Command prefix
Instrument ID
Active Keys:

^ -next item

v -prev. item
CAL-enter in
modifying mode
SET-exit SETUP
RANGE-select
parameter

See also items

Help printings

61

• 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.

SETUP REPORT
Instr ID 0003
Cal Time Out OFF
One Cal Point
pnt
Custom Buffer
pH 3.000
Cb2 Not defined
Ion Charge undf

• Press CFM to print the
setup report or CAL to exit
without printing.

Date 2004/01/01
Time 02:28:34
Printer ON
Beep OFF
Baud Rate 2400
Comm prefix 16
ALARM HIGH LIMIT
pH no
mV no
Rel mV no
ppm no
ALARM LOW LIMIT
pH no
mV no
ppm no
Temperature °C
AUTO-LOG:
Interval 000:05
START Condition:
btn-button
STOP Condition:
Duration: 03:00

62

From setup mode, if CAL and then
PRINT is pressed for a chosen pa­rameter, a help printout will pro­vide the following information (e.g.
Alarm Time-Out):

During logging, an automatic
printout will provide the following
information for pH, mV and ISE
(AD1020 only), log-on-demand
and automatic logging modes:

LOG ON DEMAND
Instr ID 0003
Date 2004/01/01
Time 01:13:53
Sample No 1
pH 7.01
mV -23.3

°C 26.2

Offset -22.9mV
Slope 100.0%

SET

ALARM TIME-OUT

(OFF or 1-7)
Active Keys:
^ -increment
v -decrement
CAL-exit, no save
CFM-save & exit
CLR-set to
default

START AUTOLOG
Instr ID 0002
Lot L03
Date 2004/10/15
Time 18:05:01
Interval 00:30
Slope 99.7%
Sample No 1
pH 7.02
mV -0.5

°C 25.0

Sample No 2
pH 7.01
mV -0.2

°C 25.0

Sample No 3
pH 6.97
mV 1.9

°C 24.9

STOP AUTOLOG
Date 2004/10/15
Time 18:06:51

63

TEMPERATURE CALIBRATION

(for technical personnel only)

The instruments are factory calibrated for temperature.
Adwa’s temperature probes are interchangeable and no
temperature calibration is needed when they are replaced.

If temperature measurements are not accurate, tempera­ture new calibration should be performed.

For an accurate recalibration, contact your dealer or the
nearest Adwa Customer Service Center, or follow the
instructions below.

• Prepare a vessel containing ice and water, and an­other one containing hot water at approximately 50°C
(122°F). Place insulation material around the vessels
to minimize temperature drift.

• Use a calibrated thermometer with a resolution of 0.1°C
(or 0.1°F) as reference thermometer. Connect the
supplied
ate socket on the rear panel.

• With the instrument off, press and hold the CAL & up
arrow keys, then power on the instrument. The “CAL”
tag lights up and the secondary LCD shows 0.0°C (or

32.0°F). The primary LCD will display the measured
temperature or “----”, if the reading is out of range.

AD7662 temperature probe to the appropri-

64

• Immerse the temperature probe into the vessel with
ice and water as close as possible to the reference
thermometer. Allow a few seconds for probe thermal
stabilization.

• Use the arrow keys to set the reading on the second­ary LCD to that measured by the reference thermom­eter.

• When the reading is stable and close to the selected
calibration point, the CFM tag starts blinking.

• Press CFM to confirm. The secondary
LCD will display 50.0°C (or 122.0°F).

• Immerse the temperature probe into the second ves­sel as close as possible to the reference thermometer.
Allow a few seconds for probe thermal stabilization.

• Use the arrow keys to set the reading on the second­ary LCD to that of the hot water measured by the
reference thermometer.

• When the reading is stable and close to the selected
calibration point, the CFM tag starts blinking.

65

• Press CFM to confirm. The instrument
returns to normal measurement mode.

Note: If the reading is not close to the selected cali-

bration point, the WRONG tag will blink. Change
the temperature probe and restart calibration.

mV CALIBRATION (for technical personnel only)

The instruments are factory calibrated for mV range.

Adwa’s ORP electrodes are interchangeable and no mV
calibration is needed when they are replaced.

If measurements are not accurate, a mV recalibration
should be performed.

For an accurate recalibration, contact your dealer or the
nearest Adwa Customer Service Center, or follow the
instructions below.

A two or three-point procedure can be performed at 0.0,

600.0 and 1800.0 mV.

• Attach a mV simulator with an accuracy of ±0.1 mV
to the BNC connector on the rear panel.

• With the instrument off, press and hold the CFM &
STORE keys, then power on the instrument.

66

The CAL tag lights up and the secondary LCD shows

0.0 mV.

• Set the simulator to 0.0 mV. When the reading is stable
and close to the selected calibration point, the CFM
tag starts blinking.

• Press CFM to confirm and the secondary LCD will
display the second expected value (600.0 mV).

• Set the simulator to 600.0 mV. When the reading is
stable and close to the selected calibration point, the
CFM tag starts blinking.

• Press CFM to confirm. The secondary LCD will dis­play the third expected value (1800 mV).

• Set the simulator to 1800.0 mV. When the reading is
stable and close to the selected calibration point, the
CFM tag starts blinking.

• Press CFM to confirm. The instrument returns to mea­surement mode.

Notes:

• If the reading is not close to the selected point,
the WRONG tag will blink. Verify the calibra­tion conditions or contact your dealer if calibra­tion can not be performed.

67

• To return to normal measurement mode, press
CAL at any moment during calibration.

• If the calibration procedure is ended after the

600.0 mV point is confirmed, the meter returns
to normal measurement mode and stores a 2­point calibration data.

ANALOG OUTPUT

For the full range of each measurement, the analog out­put varies from - 2000 to 2000 mV.

PC INTERFACE

Data transmission from the instrument to the PC can be
done with the AD9316 Windows® compatible software
(optional). AD9316 also offers graphing and on-line help
feature.

Data can be exported to the most popular spreadsheet
programs for further analysis.

To connect your instrument to a PC, use a standard USB
cable. Make sure that the instrument is switched off and
plug the cable to the instrument USB port and to the PC
USB port.

68

pH ELECTRODE CONDITIONING &
MAINTENANCE

PREPARATION PROCEDURE

Remove the pH 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 are dry, soak the electrode in
A7082 electrolyte solution for at least one hour.

69

For refillable electrodes:

If the filling solution (electrolyte) is more than 2.5 cm
below the fill hole, add AD7082 electrolyte solution.

For faster response, unscrew the fill hole screw during
measurements.

STORAGE PROCEDURE

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
drops of AD70300 storage solution.

NEVER STORE THE ELECTRODE IN DISTILLED
OR DEIONIZED WATER.

PERIODIC MAINTENANCE

Inspect electrode and cable. The cable used for con­nection to the instrument must be intact and there must
be no points of broken insulation on the cable or cracks
on the electrode stem or bulb. Connectors must be per­fectly clean and dry. If any scratches or cracks are
present, replace the electrode. Rinse off any salt depos­its with water.

70

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
above.

CLEANING PROCEDURE

Soak in deionized water for approximately 30 minutes.

IMPORTANT: After performing any of the cleaning
procedures, rinse the electrode thoroughly with deion­ized water, refill the reference chamber with fresh elec­trolyte and soak the electrode in AD70300 storage
solution for at least 1 hour before taking measurements.

71

TROUBLESHOOTING GUIDE

SYMPTOMS

Slow response/

excessive drift.

Reading
fluctuate up and

down (noise).

The display

shows blinking
dashes during
pH

measurements.

The display

shows blinking
reading during

measurements.

Out of range in
the mV scale.

PROBLEM

Dirty pH electrode.

Clogged/dirty
junction. Low
electrolyte level
(refillable electrodes
only).
Out of range in pH
scale.

Reading out of
range or electrode
not connected.

Dry membrane/dry
junction.

SOLUTION

Soak the electrode tip
in deionized water
solution for 30
minutes and then
follow the cleaning
procedure.
Clean the electrode.
Refill with fresh
electrolyte (refill­able electrodes only).
Make sure the pH
sample is in the
specified range.
Calibrate. Check the
electrolyte level and
the general state of
the pH electrode.
Check sample or
connect electrode.

Soak in AD70300
storage solution for
at least one hour.

72

SYMPTOMS

The meter does
not work with the
temperature probe.
The meter fails to
calibrate or gives
faulty readings.
Explicit warnings
are displayed
during pH
calibration.

At start-up the
meter displays all
LCD permanently.
Long beep heard
when pressing a
key.

Digits can not be
introduced with
the numeric keys.
“Err xx” error
message
displayed.

PROBLEM

Out of order
temperature probe.

Broken or out of
order pH electrode.

Dirty/broken pH
electrode,
contaminated
reference or
buffers.
One of the keys is
blocked.

Key without
function in current
mode. End of range
reached with the
ARROW keys.
Max. value reached
for corresponding
range.
Internal error.

SOLUTION
Replace the probe.

Replace the
electrode.

Follow displayed
instructions.

Check the key­board or contact
the vendor.
Don’t press keys
without function
in current mode.

Delete digits.

Turn off the meter
and then turn on.
If the error persist,
contact the dealer.

73

ELECTRODES, PROBES AND SOLUTIONS

AD1131B Refillable pH electrode with glass body,

tip protection bottle, BNC connector
and 1 m cable

AD1230B pH electrode with Epoxy body, tip pro-

tection bottle, BNC connector and 1
m cable

AD3230B ORP electrode with Epoxy body, tip

protection bottle, BNC connector and
1 m cable

AD7662 Stainless steel temperature probe with

1 m cable.

AD70004P pH 4.01 buffer, 20 ml sachet, 25 pcs
AD70007P pH 7.01 buffer, 20 ml sachet, 25 pcs
AD70010P pH 10.01 buffer, 20 ml sachet, 25 pcs

AD70000P Rinse solution, 20 ml sachet, 25 pcs.
AD7004 pH 4.01 buffer solution, 230 ml bottle
AD7007 pH 7.01 buffer solution, 230 ml bottle
AD70010P pH 10.01 buffer solution, 20 ml sachet,

25 pcs.

AD7000 Rinse solution, 230 ml bottle
AD7082 Refilling solution, 3.5M KCl, 4x30 ml
AD70300 Storage solution, 230 ml

74

75

ADWA INSTRUMENTS Kft.

Alsókikötõ sor 11, 6726 Szeged, Hungary

Tel. [phone]

Fax [phone]

e-mail: [email protected]

www.adwainstruments.com

MANAD1000 09/14

76