INSTRUCTION MANUAL
Laboratory Equipment Pty Ltd
email: sales@labec.com.au
Ph: 02 9560 2 811 • Fax: 02 9560 61 3 1
www.labec.com.au
2014
INSTRUCTION MANUAL FOR
PL-600
Lab pH Meter
PLEASE READ THIS MANUAL CAREFULLY BEFORE OPERATION
Content
1. Introduction 4
2．Technical Data 4
3. Accessories and installations
4. LCD icon 5
5. Operation key 7
6. Measurement 8
6.1 PH measurement 8
6.2 mV measurement 9
6.3 Measurement ending point status setting 10
7. PH sensor calibration 10
8. Information storage, back display, clear & communication 12
8.1 Measurement information manual storage 12
8.2 Measurement information back display 13
8.3 Clear measurement information 13
8.4 RS232 communication 14
9. Setting of function parameters 14
9.1 Sensor calibration information（P1） 14
9.2 Date & time setting (P2) 15
5
10. Self diagnostics information 15
11. Maintenance 16
12. Packing accessories 17
13. Warranty period
Appendix I PH linear error checking method 19
18
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1. Introduction
We thank you for having purchased PL-600 lab pH meter。
Before using the instrument, please note that the operation
instructions should be read carefully, which will help you to operate and
maintain the instrument, as well as to avoid trouble caused by unsuitable
operation and maintenance.
PL-600 pH meter employs leading edge technology with integrated
microprocessor, which is suitable for pH and mV measurement in water
solutions for institutes, industrial labs and production fields.
The information presented in this manual is subject to change without
notice as improvements are made.
2．Technical data
2.1 Instrument can be used under following condition：
a. Ambiciant temperature：5～35℃；
b. Relative humidity：≤85%；
c. Power supply：DC9V power adapter;
2.2 Main parameters
2.2.1 Measurement arrange
pH：0.00～14.00 pH
mV：±2000 mV
Temperature： -5.0～105.0℃
2.2.2 Resolution：0.01pH、1mV、0.1℃
2.2.3 Measurement precision：
pH：≤0.01 pH
mV：≤0.1% F.S
Temperature：≤0.5℃
2.2.4 Input current：≤10
2.2.5 Input impedance：≥10
-12
A
12
Ω
2.2.6 Stability：≤0.01pH/3 hrs
2.2.7 Temperature compensation range：0.0～100.0℃
2.2.8 Storage capacity for measurement data：64 sets；
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2.2.9 Content of storage：number of measurement value、measurement
④
⑤
value 、 temperature value 、 ATC or MTC
status、measurement date、measurement
time
2.2.10 pH buffer which are suitable for the instrument:
standard PH buffer：PH4.00、PH7.00、PH10.01
2.2.11 Communication port：RS232
2.2.12 Dimension of enclusre：200×160×65mm
2.2.13 Weight：0.65 kg
2.2.14 Power：≤5W
3. Installation of accessories
Install the arm of the electrode holder on the base.
Plug the pH combination electrode and DC9V power adaptor into
relative socket. As soon as you have connected the DC9V power adaptor
to AC220V(or AC110V), the instrument is in hold mode.
4. LCD icon
②
①
③
⑥
⑦ ⑧
⑨
- 4 -
In above picture：
Icon ①：RS232 communication
strument has been connected with PC, When this icon displays, the in
the PS232 communication function is open automatically.
Icon ②：Timing storage of the measurement value
（only valid for type
640） When this icon displays, the measurement value timing storage
function is open, the instrument will store the measurement data according
to set intervals.
Icon ③：Sensor diagnostics
、 、
After pH sensor calibration, the instrument will display sensor
performance：
：sensor is in good performance；
Icon④：Measurement status icon
：sensor performance is so so；
：sensor is in bad performance, need to be changed
、 ：
：when display this icon, the measurement value is in stable status,
but the instrument still goes on measurement.
：when display this icon，the measurement value is in stable
poising status, the value will be kept(auto ending point
function)
Icon ⑤：E n Err
Th gnostics function, when problems occurs
e instrument has self dia
rror ico
during operation, the instrument will display relative tips for error signal
and code, to remind you.
Icon ⑥：Temperature measurement
status icon
- 5 -
and pH temperature compensation
MTC icon：the temperature displays is manual entered, pH manual
temperature compensation.
ATC icon：the temperat
tem
perature auto compensation.
Ic n Cal1、Cal2、Cal3：
on ⑦：PH sensor calibration ico
ure displays is actual measurement value, pH
Cal1 icon：first point pH calibration
Cal2 icon：second point pH calibrati
on
Cal3 icon：third point pH calibration
Icon
⑧：PH sensor performance icon
Offset icon：pH sensor zero point
icon
Slope icon：pH sensor slope icon
Icon
5. Opera
⑨：Measurement data storage, back display icon
icon：measurement data storage icon
icon：stored measurement data back display
tion key
The instrument
ON/O t, but the power
FF: Power key. When switch off the instrumen
has 6 operation keys，as follows：
adaptor has not plugged from the AC220V socket, the instrument is in hold
mode.
MOD
E: Function key. To be used to switch between measurement
functions（pH measurement function/mV measurement
function）.Long key used to functional parameter setting
CAL：Ca
libration key. To be used to pH sensor calibration.
M+/∧ ： Storage key、manual temperature setting key（
increase）、
.
functional parameter setting key.
After the measurement data
m
easurement information.
During pH measurement
unde
r MTC status, is used to setting the sample temperature manually.
getting stable, is used to store the
and calibration, when sample temperature is
（increase）。
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Under the functional parameter setting condition, is used to modify the
set
ting of the functional parameter.
R mperature setting key（decrease）、
M/∨ ： Back display key、manual te
functional parameter setting key
Under measurement mode，
disp
lay stored measurement information；long key（press the key >1.5s）
short key（press the key <1.5s）to back
to clear all stored measurement information.
In pH measurement and calibration process,
tem r
pe ature is under MTC mode, to set the sample temperature
when the sample
manually（decrease）。
Under the functional p
set
ting of the functional parameter.
READ: Measurement key. This is a
arameter setting condition, is used to modify the
combination key. Press the key ＜
1.5s，the instrument in measurement mode.（short key）。Press
the key ≥1.5s，the instrument will set the auto ending point
function or cancel the action（long key）.
6. Measu
6.1 pH measuremen
rement
t
Remarks：Befo
re first time using the pH sensor, the pH sensor
should be calibrated.
Under pH measurement mode, immerse the sensor into the sample
after rinsing with distilled water, shaking the vessel few minute, must press
“READ” key（short key），when the LCD display“
”auto ending function
icon, the instrument will block the
measurement value, the value could be
read. In left chart, the date is 1
st
March,
time is 8 o’clock 28 ， the sample
ending function，measurement
temperat re is 25.0℃ ， automatic
temperature c mp nsation ATC），auto
value 7.00pH,the electrode is in good
u
o e （
performance.
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Under pH measurement mode, immerse the sensor into the sample
after rinsing with distilled water, shaking the vessel few minutes, if the
instrument has not been set to auto ending function, LCD will display
“
”icon if the measurement is stable,
th measurement value could be read. In
e
left chart, the date is 1
st
March, time is 8
o’clock 28，the sample temperature is
25.0℃ ， automatic temperature
s n a
function ， measurement valu
compen atio （ ATC ）， uto ending
e
7.00pH,the electrode is in good
performance.
Under pH
flash
es，to remind you the current pH temperature compensation mode, is
measurement mode, when press <READ>key， “MTC” icon
manual or automatic, as well as to confirm the sample temperature
displayed, then press < M+/∧>key、<RM/∨>key to modify the sample
temperature, then press， <READ>key to confirm the entered temperature
value and measure.
6.2 mV measurement
Under mV measuremen
t mode, immerse the sensor into the sample after
rinsing with distilled water, shaking the vessel few minute, must press
“READ” key（short key），when the LCD
display “
the in will block the
measurement valu the lue cou be
read. In left chart, the date is 1
”auto ending function icon,
strument
e, va ld
st
March,
time is 8 o’clock 28 ， the sample
temperature is 25.0℃，automatic
temp ra ure compensation（ATC），auto
e t
ending function，measurement value 1818mV.
6.3 Set measurement ending point judgment sta
The instrument has 2 statuses of measurement
judg
ment（display“
”or “ ”icon），under the measurement mode, （PH
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tus
ending point
or mV measurement），press <READ> long key to change the status.
When the measurement is in balance status, “
instr enument will keep this value, the measurement is d; when the
measurement is in stable status, “
could be recorded, and the measurement is continuing, according to the
balance stability, to be sure if display “
” displays，the measurement
” or not.
”displays，the
value
7. pH sensor calibration
1 point calibration
Under the pH measurement mode,
pres
s<CAL>key，LCD displayed as left
chart,“Cal1”icon flashes，immerse the
electrode into the standard buffer after
rinsing with water, shake the vessel for
few minutes, wait for few seconds,
should be followed by the operat
press<CAL>key，the instrument wi
recognize which buffer solution is it,
display as well, wait the instrument ju
pH sensor response to ending point,
display as chart left, 1 point calibration
accomplished the display shows below,
“Cal2”flashes，the instrument reminds
you 1 point calibration is finished, do you
want to proceed 2 points calibration? If
only 1 point calibration needed, press
“READ”to exit calibration process, swit
to pH measurement mode. If the 2 points
calibration is needed, the next chapter
or.
ll
dge
is
ch
- 9 -
Remarks：After 1 point calibration, only the zero potential of the
sensor is modified （Offset），the slope of the pH sensor is kept from last
calibration. Even to those electrodes which have good performances,
0.05pH measurement error could be reached during measurement.
2 points calibration
After 1 point calibration, LCD
disp hes),
lays as above chart (“Cal2”flas
immerse the electrode into standard
buffer solution, shaking the vessel for
minutes, wait for second, press“CA L”，
instrument will recognize which buffer
solution is it, display as well, wa
it the instrument judge pH sensor
response to ending point, the instrument displays as above chart,
calibration has been accomplished, automatically enter the pH
measurement mode, the display shows below, “Cal3”flashes，
the
instrument reminds you 1 point
calibration is finished, do you wa
proceed 3 points calibration? If only 2
point calibration needed, press “READ
to exit calibration process, switch to pH
measurement mode. If the 3 points
h rator.
calibration is needed, the next c
apter should be followed by the ope
few
the
2 points
nt to
”
Remarks: After 2 points calibration, the instrument will modify the
offset and slope of the electrode。PH measurement under this kind of
calibration status, the measurement precision is quite good.
3 points calibration
After 2 point calibration, LCD
disp hes),
lays as above chart (“Cal3”flas
immerse the electrode into third
standard buffer solution(e.g. PH9
.18
Buffer), shaking the vessel for few
- 10 -
minutes, wait for second, press“CA L”， the instrument will recognize which
buffer solution is it, display as well, wait the instrument judge pH sensor
response to ending point, the instrument displays as above chart, 3
points
calibration has been accomplished, automatically enter the pH
measurement mode, the sensor performance icon after calibration is also
displayed.
After 3 pints calibration, the instrument has the best measurement
precision. Especially for broadly ranged pH measurement, the
measurement errors from unlinearity will also be modified.
During pH calibration, “MTC” icon on LCD displays，to remind you
current temperature compensation method, is manually（MTC），and
please confirm the temperature of current sample, press < M+/∧>、﹤RM/
∨>key to moodily the temperature of the sample, then press <CAL>key to
confirm the temperature imputed and start with pH sensor calibration.
8. Measurement information store, back display, clear and RS232
communication
8.1 Store measurement information manually
During PH or mV measurement, when the measurement value is
stable,（display “
”or “ ”icon）， when the auto storage function of type
640 meter is set to “Off”，press< M+/∧>key，store the current measurement
value （ including measurement value number, measurement value,
temperature value （ ATC or MTC status ）、 measurement date,
measurement time），LCD will display icon
, together with measurement
value store number in around 5 minutes, then back to last measurement
status.（display date on the position of storage number display）.
8.2 Back display of measurement information
Under measurement status (PH or mV measurement），press< RM/∨
>short key，the instrument will back display of last stored measurement
data （ including measurement value number, measurement value,
temperature value （ ATC or MTC status ）、 measurement date,
measurement time）.
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In below chart, measurement value number is 88 ， 7.00pH ，
measurement time 8:28（display measurement date and measurement
time alternatively）， sample temperature
is 25.0℃（ATC）.
Under the back display mode, the
instrument will pause operation of the
timing storage of the measurement
information.（Only valid for type 640）.
8.3 Clear stored measurement information
When the instrument memory is full,
will not store the measurement
information; or the information stored is
not needed anymore, clear the memory
is needed. Under the measurement
mode（PH or mV measurement），press<
RM/∨>long key，LCD is displayed as left chart, icon
flashes，to
remind you clear the memory, if this operation is confirmed, then press<
RM/∨>short key to finish clearing of the memory; if this action is not
needed , press< READ>short key to abort, return to measurement mode.
Remarks：The measurement information cleared will not be recovered!
8.6 RS232 communication
After installed the communication software supplied by or company
on the PC, when connect PC and the instrument using the RS232
communication cable, LCD will display RS232 communication icon
，to
show that the instrument has been connected with PC.
When the LCD displays RS232 communication icon
，the manual
saving, auto saving, timing saving information (includes measurement
value number, measurement value, temperature value (ATC or MTC),
measurement time, measurement date) will be transferred through RS232
port to PC. Otherwise, the manual saving, auto saving, timing saving
information (includes measurement value number, measurement value,
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temperature value (ATC or MTC), measurement time, measurement date)
will be stored in memory of the instrument.
9. Functional parameter setting
Press <MODE> key longer than 1.5s, the instrument comes into
functional parameter setting mode. Under this mode, operator could check,
modify and set the relative information, parameter and function. Under this
mode, using <MODE>、<M+/∧>、<RM/∨> 3 short keys to set the procedure
parameter: <MODE> short key is used to cycle choosing functional
parameter setting items，<RM/∨> key、<M+/∧> key are used to modify the
process functional status and parameters. Press<MODE>long key to
protect procedure setting item parameters and end procedure parameter
setting status, back to formal status.
9.1 Electrode calibration information（P1）
Under this status, the operator could check the calibration information.
Press <MODE>long key to enter the program parameter setting status
“P1”，the LCD displays as left chart. Press< M+/∧>short key to display zero
potential of the pH sensor（Offset）mV value、Slope value alternatively.
Information displayed in left chart：the calibration date of PH sensor is 1
st
of March （ display calibration date and calibration time
alternatively）;calibration method is 2 points calibration; temperature of the
solution is 25.0℃（ATC）；PH sensor zero point （Offset）is 0.0mV.
9.2
Date and time setting(P2)
Factory setting of the instrument is
according to current Beijing date and
time. Press <RM/∨> key to choose the
number to set, press<M+/ ∧ >key to
modify the number. The instrument has
set to 24 hours. The left chart is 1
st
March, 2004, 8:28.
10. Self diagnostic information
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The instrument has self diagnostics function, during operation,
relative information will be reminded by the instrument, to solve problems
during usage:
Err1: Electrode potential ≥2000mV。Please check if the instrument has
been connected with the sensor, the electrode has been hanged in
air, or the electrode has damaged.
Err2: Electrode potential≤-2000mV。Please check if the instrument has
been connected with the sensor, the electrode has been hanged in
air, or the electrode has damaged.
Err3: pH value＞15.00pH。Please check if the instrument has been
connected with the sensor, the electrode has been hanged in air, or
the electrode has damaged.
Err4: pH value＜-1.00pH。Please check if the instrument has been
connected with the sensor, the electrode has been hanged in air, or
the electrode has damaged.
Err5: Memory is full, could not store measurement information. Please
record and store measured information and clear all information in
the memory
Err6: Electrode potential during calibration over ranged selected pH buffer
set. Please check if the instrument has been connected with the
electrode, the electrode has damaged, if pH buffer selection is
correct, then recalibrate the electrode.
Err7: pH electrode zero point potential over range. Zero point potential
Offset＜-60mV，Offset＞60mV. The instrument will not allow you to
operate. Please check if there is air bubbles in electrode head, if the
buffer selection is correct, the pH buffer is in good quality, then
recalibrate the electrode. If the error still occurs, please change the
electrode.
Err8: pH slope over range Slope＜85％，Slope＞105％。The instrument will
not allow you to operate. Please check if there is air bubbles in
electrode head, if the buffer selection is correct, the pH buffer is in
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good quality, then recalibrate the electrode. If the error still occurs,
please change the electrode and calibrate the electrode.
Err9：During 2 point/3point calibration, instrument judge 1point ( or 2 points)
which used buffer solution are same ( or the electrode has
damaged), the instrument will judge the reliable calibration
operation and modify the relative electrode parameter. If this
occurs, please recalibrate the pH electrode.
11. Maintenance of the instrument
The performance of the instrument, is not only rely on the self
construction of the instrument, but also on good maintenance. Especially
for pH meter, which high impedance is needed, and corrosive chemical
agents is sometimes contaminated, therefore, necessary maintenance is a
must
Please, only when the instrument is power off, the plug of the adaptor
could be removed.
Please keep the instrument away from directly sunshine, otherwise
the life time of the LCD will be shortened.
The pH value of the sample solution should be between the pH buffer
solutions you selected. If the temperature of the buffer solution during
calibration is same as the temperature of the sample, the highest
resolution will be reached by the instrument.
Temperature compensation function in the instrument is only
effected to compensate the sample temperature changes
according to pH sensor.
The electrode plug should always keep high cleaning and dry. In order
to protect the electrode from broken, please do not contact the head of the
electrode with hard materials, since it is very thin. Please refer to the
instruction manual of the electrode for the storage, cleaning and
maintenance of the electrode. .
Please do not contact the central part of the BNC electrode plug by
- 15 -
hand or metal, the static electronic will destroy the electronic part of the
instrument and contaminate the input terminal of the electrode, decrease
the input impedance of the instrument.
Please do not use agent to clean the enclosure of the
instrument. The enclosure of the instrument is ABS engineering plastic
s.
11．Packing accessories
Operation manual, QC certificate are included in the package of the
instrument, as well as accessories below,
1. 1pcs of pH combination electrode；
2. pH 4、7, buffer solution 1 bottle each；
3. 1 set of electrode holder；
4. 1pcs of DC9V power supply；
13. Warranty period
The warranty period of electronic components is 2 years from the
date of purchase, under the condition of normal storage, operation and
transportation, improper working of the instrument due to quality problems,
the instrument will be repaired and the spare parts will be changed for
customers with supplying of the sales invoice and product inspection
certificate.
- 16 -
Appendix 1 Checking method of pH linear error
Input 177.48mV(pH4.00 buffer solution electrode potential simulate
value)、-178.07mV(pH10.01 buffer solution electrode potential simulate
value) into the instrument，temperature compensation sent to 25℃，
operate according to 2 points calibration；after calibration the instrument
displays “
”signal.(if type 640 please set the buffer solution set to
b1)Check the linear error of the instrument according to following table.
mV
414.11 354.95 295.80 236.64 177.48 118.32 59.16 0
pH 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00
mV -414.11 -354.95 -295.80 -236.64 -177.48 -118.32 -59.16
pH 8.00 9.00 10.00 11.00 12.00 13.00 14.00
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