PHB21
Portable pH/mV Meter
Instruction Manual
Portable pHmeter
Index
Specifications...............................................................2
PH Measurement.............................................................3
MV Measurement ............................................................7
Parts Description.............................................................8
Equipment Operation.........................................................9
Equipment Operation pH - Set Up...............................................12
Equipment Operation pH - Calibrate ............................................14
Equipment Operation pH - Read ...............................................15
Equipment Operation pH - Check ..............................................16
Equipment Operation pH - Register .............................................17
Equipment Operation mV - Set Up ..............................................19
Equipment Operation mV - Calibrate............................................21
Equipment Operation mV - Read...............................................22
Equipment Operation mV - Check..............................................23
Equipment Operation mV - Register.............................................24
Equipment Operation ºC - Set Up...............................................26
Equipment Operation ºC - Read ...............................................29
Equipment Operation Turning Off...............................................30
Electrode Type pH...........................................................31
Maintenance ..............................................................32
Communication Cables......................................................34
PHB21
2.
pH
Range -2,00 to 20,00 pH
Resolution 0.1 / 0.01 pH
Relative Precision 0.01 % (full scale)
mV
Range ± 1999 mV
Resolution 1 mV
Relative Precision 0.05 % (full scale)
Temperature
Range 20 to 120 ºC
Resolution 0.1 ºC
Relative Precision 0.08% (full scale)
General
Input Impedance 1013 Ù
Isopotential Adjust ± 50%
Sensibility Adjust 80 to 120 %
Temp. Compens. Auto / Manual -20 to 120 ºC
Display Alphanumeric 2 lines x 16 characters
Datalogging Up to 99 Readings
Alarms maximum and minimum
Dimensions L x H x D (mm) 100x75x180
Weight 0.45 kg
Enclosure IP-67
Power 9Vcc Battery
Battery Life 60 hours
Accessories
Glass pH Combined Electrode PHE-21R
Buffer Solutions 4.01 pH and 7.00 pH
Alkaline Battery 9 V
Instruction Manual CD
Optional
Thermocompensator PHE-22R
Redox Electrode ORE-22R
Depth Probe PHE-221
AC Adapter CDH-30PW (110/220Vac 50/60Hz)
&
&
&
&
&
&
&
&
&
&
&
&
&
&
Specifications
pH / ORP / Temperature
Simple 3 keys operation
Automatic Resolution Selection
Electrode automatic Check
Continuous or Hold Readings
Non-Volatile Memory, even when turned off
sustains the set up programmed
Automatic Calibration for all parameters
Manual or Automatic Temperature
Compensation
Maximum and Minimum Sound Alarm
Recognizes Buffer
Battery Charge Automatic Monitored
99 points Datalogging
110/220Vac Capability (AC Adapter)
Supplied with Glass Electrode, Buffers and
Carrying Case
2
3.
PH Measurement
Stable chemical compounds, are electrically neutral when mixed with water.
In order to form a water solution, dismember in positive or negative charged particles.
These charged particles are called "i ”. When we apply differential potential in two electrodes immersed in a
solution, it is possible to verify that positive ions (H , Na and more) will migrate to the negative terminal, that is
why we call them cations. The reverse happens with negative ions (OH , Cl and more) that will migrate to the
positive terminal and we call them anions. The ions freedom to migrate thru a solution is measured with
the solution ". Chemical compounds that produce conductive solutions are called
lectrolytes Strong
E
" ". Those that totally dissociate (strong acids, strong bases and salt) are called "
Electrolytes
“Electrical Conductivity
".
The others whose dissociation is not big (acids and weak bases) are called " ". For an
hypotetical chemical compound "MA" that dissociates in cations and anions , the reaction can be written as:
The arrow indicates that exists a balance between MA not dissociated and the ions M and A dissociated.
The extension that this reaction moves to the right or left, varies from one compound to the other and with the solution
Temperature.
For a specific temperature, there is a relation between the ions activity and the non dissociated molecules, that can vary
between 0 up to 100%. This relation is called K Dissociation and it is expressed by the equation:
ons
++
MA M A
K = aM * aA- / aMA (EQ-1)
+
++ -
--
+-
M A
Weak Electrolytes
+and -
“ “
Where: K =
ions activity M+.
For Chloridric acid, the is practically infinity, caused by the complete dissociation for ions and So it is a strong acid:
CTE dissociation.
aM+ =
ions activity A-.
aA- =
aMA =
dissociated molecules activity MA.
+-
"K" .
HCl H Cl
+ + -
HCl
On the other hand, Acetic acid has a low . Reacts as the following way:"K"
CH COOH H CH COO
33
+ + -
Few hydrogen ions result at the solution, so the acetic acid is an weak acid when the most present ion is the OH-, the
solution is alkaline.
NaOH Na OH
The sodium hydroxide is totally dissociated, this is the reason for being a On the other hand the Ammonia
Hydroxide do not dissociate too much, this the reason for being a .
WEAK BASE(NH OH)
4
NH OH NH OH
44
+ + -
STRONG BASE.
+ + -
As we can see, for both acids and bases the strength of a solution depends on the H+ or OH- ion numbers available that
depends not only on the compound concentration at the water, but also on the " " Pure water dissociates for
Ions H+ and OH-, but it is very weak.
The water molecules number dissociated is low, in comparison with the non dissociated, so we can consider as an
activity of HOH equal to 100%.
HOH H OH
+ + -
K dissociation.
3
3.
PH Measurement (cont.)
At 25°C the of water has a value of 10 where we can take that is the activity product (aH+) by
"K" dissociation (EQ-1)
(aOH-) is equal to ion OH-, the solution is neutral and activities of H+ and OH- must be both of 10 mols / L.
If a strong acid, such as HCl, is added to water, many ions H+ are added; this should reduce the number of ions OH-. For
example: if added HCl until the OH+ activity turns 10-2 the OH- activity must turn 10-12. The hydrogen potential scale is
Established by a definition merely operational, the acid degree or activity of ions H+ will be expressed by therm "pH”
(Hydrogenionic potential).
The pH will be defined as:
pH=-log |aH+|
If the activities of ion H+ is 10-x so pH is "x".For example, at pure water @ 25°C, the hydrogen ion activity is 10-7, so the pH
Is 7 @ 25°C.An acid solution has more ions H+ then OH-.So the ions H+ activities will be bigger than 10-7, being, 10-6, 10-5
and more. The pHof an acid solution by definition, must be lower than 7, will be 6, 5, 4...
If the OH- number exceed the number of ions H+ the H+ activity must be lower than 10-7, being, 10-8, 10-9 and more... The
pHwill be bigger then 7, will be 8, 9, 10...
To avoid solution ionic concentration modification being measured it is necessary that the current that goes thru the circuitry
composed by the galvanic cell (pH electrode) be minimum (I < 1pA), such as the voltage drop caused by the internal
resistance of the same electrochemistry cell being null, not to cause measuring errors. Such condition restrict the choice to
Choose the instrument to a "HIGH IMPEDANCE VOLTMETER”. The instrument will have a scale graduated in pH,
calibrated by glass electrode and a reference electrode based on the relation between the pH and the electromagnetic force
Of the cell.
E = E0 - KT (pH)
Above equation, define the equation of a line, whose decline is and whose origin ordenate is . The electrode must
-KT E
have a zero volts point (isopotential), that can be achieve performing a correspondence to 7 to zero volts, to any
temperature, using a internal BUFFER at the glass electrode, whose pH variation with the temperature compensates to the
temperature variation at the electrode.
The approximate decline of the line mV / pH involves the factor adjustment of factor KT @ 59.16 mV decade of pH, @ 25°C
by controlling the equipment “ that does the decline around the isopotential. The temperature compensator is
SENSIBILITY"
applied to correct the decline based on real sample temperature, varying the definition of the instrument, relating to a
1pHunit, from54.20 mV @ 0°C up to 66.10 mV @ 60°C.
600 -
500 -
400 -
300 -
200 -
100 -
0
-100 -
-200 -
-300 -
-400 -
-500 -
-600 -
4
3.
PH Measurement (cont.)
Electrode Description
pH sensing Bulb
1 - - rugged construction, in order to avoid ease breakage.
Glass Body
2 - - chemically inert.
Punctual Ceramic
3 - .
Seal
4 - - ease operation for electrolyte solution filling.
Low Noise Cable
5 - - assuring stable readings..
Polypropylene Cap
6 - - chemically aggressively resistant.
7 - - avoid contamination with solutions that contain Silver, Mercury, Sulfite, etc.
Ionic Barrier
Avoid AgCl preciptations. Provides quick readings on temperature variations.
8 - - contains reference electrolyte solution for transportation or storage.
Transportation Cap
9 - (on refillable electrodes only).
Electrolyte Fill Hole
10 -
Argental Reference.
Electrode Usage Instruction
DIAPHRAGM
BULB (1)
TRANSPORT CAP (8)
(3)
1 - Before using the electrode, verify it’s body for possible mechanical defects or cracks
and in case it occur, replace it immediately.
2 - Take off the transportation cap and rinse the electrode with distilled water, remove
eventual crystallization at the diaphragm (3). The transportation cap must always be
used when transporting the electrode, avoiding dehydration of the bulb (1).
3 - Remove the seal (4) in order to establish Atmospheric Pressure (only applicable for
refillable electrodes) and cl o s e it ag a i n .
4 - Eliminate possible air bubbles that may occur internally at the bulb (1), by shacking
the electrode vertically.
5 - On Refillable electrodes, the electrolyte level must be at a maximum of 10 mm
below the hole (9).
6 - Always refill, when necessary, the electrolyte level with 3 MKCl thru the hole (9). On
Bridge Electrolytic Electrodes, with the proper bridge (see table 1) thru the hole (9).
7 - When the Electrode is not in use, always immerse into electrolyte reference.
8 - To measure, just immerse the electrode into the sample, covering the diaphragm (3).
9 - Switching from one solution to other, always wash electrode with distilled water.
REFILL HOLE
(9)
SEAL
(4)
5
3.
Buffer Soutions
These are solutions that resist the ph variations, by effect of adding acids or bases and/or by dilution, all happening like if they
had an acid reserve and/or alkaline. Selected solutions are used as standard for calibration of ph meters based on operational
definition. They are fixed points that define the pH scale. Composed, usually, by a weak acid mixed with its own strong base salt.
The KCl is a neutral salt, so does not interfere at the pH value. It can be used to raise the conductivity at the sample, in case we
Are measuring a weak electrolyte.
Supplied in 475ml Bottles (other volumes upon request)
OMEGA offers the following Buffer Solutions:
PHA-4 4.01pH
PHA-7 7.00pH
PHA-10 10.01pH
PH Measurement (cont.)
6
4.
Oxide Redox Potential Measurement
In order to measure potential redox it is used metallic electrodes, generally Platinum or Silver. This type of
electrode refers to chemical reactions in solutions that operate only by electrons transference. Such reactions
occur with composed elements presenting two or more oxidizing stages. Ex.: Fe2+ / Fe3+. The redox
measurement applications in a determined process, complies with previous knowledge of certain factors:
presence of infectants capable of competing with the main redox reaction, approximate values of the ions activity
coefficients entering the final equation of the potential differential, approximate speed of the reaction to be
controlled, necessary or not to control the pH. At Oxide reduction systems where the ions H+ take part at the
reaction, the redox potential depends on the pH. In order to obtain a complete description of such systems it is
necessary to indicate, besides the reference electrode, the pH value. The temperature has two effects over the
redox potential. First it enters as a factor over the logarithem of equation. This means that a determined
reason of the ionic activity, the electrode will develop a different potential. Second, the temperature influence the
Ionic activity on each ion of the solution.
MV Measurement
NERNST
7
5.
Parts Description
8
7
6
Items Description
1
2
3
4
5
1 -Display: Alphanumeric 2 Lines x 16 characters
2 -Membrane Keyboard
3 - Battery Lid cover
4 - Serial Output RS-232
5 - Protection lids for field protection usage
6 - AC Adapter output
7 - BNC Connector: pH Electrode Inlet
8 -BNC Connector: Thermocompensator Inlet
8
6.
Equipment Operation
To turn ON the equipment, press and hold key. Make sure the power cord is plugged correctly!
The menus are self-explanation with it’s respective options, selected by pressing the key.
After making your selection(flashing option), using key, press the key to confirm
Your selection. This manual will represent the Flashing Option always in .
In case of any error or if you decide to change your selection, press the key to move the
screen one step back so you can make the necessary changes, or hold this key for about 5seconds in
order to turn OFF the equipment, until the message “SWITCH OFF? YES / NO” shows off on screen.
SETUP OPERATION
This equipment is supplied with a non-volatile memory (E2PROM), to store it’s operational set up
(resolution, reading mode, calibration, etc).
Even if disconnected from it’s power supply, it will not loose the information saved for work!
Before you start to work with this equipment, please review the setup, so you can program the equipment
based on your application!
After powering the equipment on, by pressing and holding key, the equipment will perform an
Auto Check and will then stop at Main Menu(Select Function) with options for the user to Select the desired
Function. pH function will be flashing as a default. Press key to move around until you reach
the desired selection(flashing option) then press key to access the sub-menu were you will find
the SETUP FUNCTION(SET.). Press the key until SET is flashing, then press key
to confirm it. The equipment will prompt for a password, press the following keys in sequence
<SELECT>
Always use key to move around the options and press key to confirm this option.
Refer to page 12 for description of Set Up Screens.
CHECK OPERATION
The Check Sensor option is very useful, it gives the user the conditions to check the sensibility of the
sensor. The operation is self-explanatory! From main menu press the key to choose the
desired function, then press key to confirm. Select option Check, then press key to
confirm option. The display will guide you thru the process.
READING OPERATION
Under this operation, you’ll find CALIBRATION and READING options .If you want to calibrate the sensor,
press the key to select the Calibration option(flashing option - CAL), then press key
to confirm. The program will guide you step by step on how to calibrate the sensor. If you need to use the
READING option, press the key to select READ (flashing option), then press key
and the display will show the following format:
<ENTER>
<SELECT>
<SELECT>
<ESCAPE>
<ENTER> <ENTER>
<SELECT>
<ENTER>
<SELECT>
Blue Color
<ESCAPE>
<ENTER>
<SELECT>
<ENTER>
<SELECT>
and follow the instructions on the display.
<ENTER>
<SELECT>
<SELECT>
<ENTER>
<ENTER>
<ENTER>
<ENTER>
1 - The Prompt signal will flick at each reading.
2 - The Measured Value and Reference Temperature(chosen at setup).
3 - Sample Temperature.
4 - Electrode’s Sensibility.
1
4
99% 25.0 ºC
8.96 pH @ 25.0 ºC
3
2
9
6.
Equipment Operation (cont.)
IMPORTANT INFORMATION
1 - In case you want to quit Reading operation, press and hold key for about 5 seconds in
order to be recognized by the equipment. This time is necessary to certify the user desires to quit this
mode.
2 - When the equipment is turned on again, the set up will follow initial conditions including the changes
prior to when it was turned off.
To turn off the equipment, press and hold key until the message to Switch Off shows on
screen, then by pressing key, choose YES to turn if off or NO to continue working and press
<ENTER>
BASIC OPERATION
The menus are self-explanatory for easy operation. To input new information or change the pre-seted
information, the menu offers flashing options, selected by key and confirmed by .
The key is used to change options or to correct data (every time the user press
The screen will move back one step or one option).
This manual will represent the Flashing Option always in .
key to confirm the option chosen.
<ESCAPE> <ESCAPE>
<SELECT>
<ESCAPE>
<ESCAPE>
<SELECT>
BLUE Color
<ENTER>
10
6.
Equipment Operation (cont.)
Basic Operations
1 - The software offers self explanatory menus for easy interaction with the user. The menu shows the selected option as
Flashing. Use the
<SELECT>
key to modify the flashing option and select a different one, then press to confirm it.
<ENTER>
2 - In case of a mistake, or data modification or to return to a prior menu, press . While at Reading Mode, press
and hold
understand that the user really desires to exit the Reading Mode.
3 - The equipment stores the configuration on a non volatile memory (E PROM). Even when turned off, the last set up
Configuration will be stored.
<ESCAPE>
key for about 5 seconds in order to exit this mode. This is necessary in order for the instrument
<ESCAPE>
2
key
Turning On the equipment
1 -Turn on the equipment by pressing . The display will show the following menus until reached the Main Menu.
Press key to turn if on<ENTER>
<ENTER>
OMEGA
PHB21 - V1.0
Program performs electronic check
============
===
Main Menu
SELECT FUNCTION
mV ºCpH
Return to prior menu for data
modification and to reach the
Turn off screen.
Turns on the instrument and
Also confirms the selected option,
Every time you see the symbols “ ” or “ ”, that means that the user can adjust the displayed value up or down.
To increase the value press key until “ ” flashes, then press to confirm, then press key and at every touch the
value will increase by one unit.
To decrease the value press key until “ ” flashes, then press to confirm, then press key and at every touch the
value will decrease by one unit.
If a mistake is made, press key to return and correct the value!
If user press and holds key, the units will move faster, but be careful when gets closer to the desired number, as you can miss it
and if that happens, press key to move back and Correct the mistake.
<SEL>
> <
<SEL> <SEL>
<SEL> <SEL>
<ESC>
<ESC>
> <ENT>
<
<ENT>
Select the menu option.
11
6.1.
Press key until option flashes, then
press key to confirm the option chosen.
Press key until option flashes, then
press key to confirm the option chosen.
Equipment Operation pH - Set Up
<SELECT> pH
<ENTER>
<SELECT> Set Up
<ENTER>
SELECT FUNCTION
mV ºCpH
pH: READ /
/CHECKSET UP
A password is required to access the Set Up mode.
Press in sequence ,, .<SELECT> <ENTER> <ESCAPE>
Program will display the battery life left.
User has the option to choose the desired language.
Press key until the desired option flashes,
then press key to confirm the option chosen.
Select the Resolution by pressing key.
Option chosen will flash. Then press key to
confirm option chosen.
Option to choose how many calibration points you need.
Press key until desired option flashes, then
press key to confirm chosen option.
User can fully adjust the Buffer values. In order to get to
know how to change the values, please refer to page 12.
<SELECT>
<ENTER>
This Screen is default and cannot be changed.
<SELECT>
<ENTER>
<SELECT>
<ENTER>
User can instruct the instrument to inform that
calibration is needed.
PASSWORD
- - -___
BATTERY
============
LANGUAGE:PORTUG.
/SPANISHENGLISH
RANGE
-2 TO 20 pH
RESOLUTION
0.1 0.01
CALIBRATION
POINTS: /3/4/52
ISO = 7.00pH
SENS.=4.01pH
<
<
>
>
INFORM CALIBR.?
/ Yes No
User can program the number of readings, before
instrument prompts for calibration. Refer to page 12
on how to adjust the number.
User can choose Reference Temperature as of 20C
or 25C.
User can choose between the following Reading Modes:
Continuous - Read continuously after time is set
Average - Reads the average after time is set
Hold - user must press key to Read
User can program the time between Readings. Refer to
Page 12 for instructions on how to adjust this time.
<ENTER>
INFORM AFTER:
200 READINGS <>
REF. TEMPERATURE
20ºC / 25ºC
READING MODE
/AVER./CONT HOLD
TIME BETWEEN READ
5s <>
A
Go to Page 14
12
6.1.
Equipment Operation pH - Set Up (cont.)
From page 12
A
User can program the display to show information like
Barr graph, Keyboard Beep, Stability Beep and more.
User can choose if desire to have Barr graph shown
above the Reading screen. When Bar Graph is
displayed, the information about Sensibility and Sample
Temperature will not be displayed!
User can now adjust the Minimum and Maximum
values for the Bar Graph. Refer to Page 12.
User can choose if instrument would Beep when Stability
is reached during Read Mode or Not.
User can choose if instrument would Beep on Keyboard
touch or Not.
During this sequence, user will be able to choose alarms
and also adjust it’s values.
Will be able to choose if RS 232 is needed and if
connected to a PC or a Printer.
Press key until desired option flashes, then
<SELECT>
press key to confirm the option chosen.
<ENTER>
DISPLAY?
/ Yes No
BARGRAPH?
/ Yes No
Min: 0pH
Max:14pH
<
<
>
>
BEEP ON STABIL.?
/ Yes No
KEYBOARD BEEP?
/ Yes No
MAX. ALARM?
/ Yes No
MAX. VALUE:
12.00pH <>
MIN. ALARM?
In order to adjust the values, refer to page 12.
Printing Mode
CONT.: Print continuously (based on the
printing interval chosen)
MAN.:
Prints the Read value just after
pressing key. But only after the
read value is stabilized (an arrow is displayed).
STAB.: Prints only one time, after the
reading is stabilized (an arrow is displayed).
<ENTER>
/ Yes No
MIN. VALUE:
2.00pH <>
RS-232 OUTPUT?
/ Yes No
RS-232 OUTPUT:
/ PC PRINTER
SPEED (100 bps)
24 48 9612
============
====
X
End
End
X
SPEED (100 bps)
24 48 9612
PRINT MODE
/Man/Stab.Cont
PRINTING INTERVAL 5s
STATISTICS?
/ Yes No
End
X
13
6.2.
Press key until option flashes, then
press key to confirm the option chosen.
Press key until option flashes, then
press key to confirm the option chosen.
Equipment Operation pH - Calibrate
<SELECT> pH
<ENTER>
<SELECT> Read
<ENTER>
SELECT FUNCTION
mV ºCpH
pH: /
READ
SET UP/CHECK
Press key until option flashes,
<SELECT> Calibrate
then press key to confirm the option
If a thermo is attached to the instrument, Manual will
be displayed and user will have the option to adjust the
Temperature Compensation. Refer to page 12.
Dip electrode into 7.00pH Buffer. This buffer value was
chosen at Set Up Operation.
.
Then press key to confirm the option
chosen.
Wait.
Remove the electrode from 7.00pH Buffer and wash it
using deionized water.
Dip electrode into 4.01pH Buffer. This buffer value was
chosen at Set Up Operation.
Then press key to confirm the option
chosen.
<ENTER>
<ENTER>
<ENTER>
pH: READ /
/REGCALIBRATE
TEMP. COMP.: Man
25ºC <>
PLACE ELECTRODE
BUFFER 7.00 pH
READY?
============
====
WASH ELECTRODE
READY?
PLACE ELECTRODE
BUFFER 4.01 pH
READY?
Wait.
The Sensibility of the electrode will be displayed
Wash the electrode using deionized water, then press
<ENTER>
Use is prompted to go to sample, if desired, press
<ENTER> <ESCAPE>
If the user had chosen Minimum or Maximum Alarm
during the Set Up Mode, the values will be displayed.
The reading will be displayed.
If user press and hold key in order to exit
the reading Mode, program will confirm if can end the
report and print the final results thru RS 232.
key to continue.
key, if not, press key.
<ESCAPE>
============
====
============
====
WASH ELECTRODE
READY?
GO TO SAMPLE!
READY?
MIN. ALARM:
->3.60pH @ 25ºC
100% 25ºC
->3.60pH @ 25ºC
END REPORT?
/ Yes No
Reading display, when the
bargraph function was chosen
Durign Set Up Mode.
============
====
<ESCAPE>
14
6.3.
Equipment Operation pH - Read
<SELECT> pH
SELECT FUNCTION
mV ºCpH
pH: /
READ
SET UP/CHECK
pH: /
READ
CALIBRATE/REG
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
<SELECT> Read
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
<SELECT> Read
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
If the user had chosen Minimum
or Maximum Alarm during the
Set Up Mode, the values will be
displayed.
Example for Reading, when
the bargraph was chosen
during Set Up Mode
GO TO SAMPLE!
Dip electrode into sample and press key.
Ready?
MIN. ALARM:
->3.59pH @ 25ºC
Indicates when the
Bargraph was not chosen
during Set Up Mode.
============
====
============
===
END REPORT?
98% 25.0ºC
->8.96pH @ 25ºC
<ESCAPE>
/ Yes No
The End Report screen will only be displayed if user
had chosen to use RS 232 during Set Up Mode.
If user press and hold key in order to exit
the reading Mode, program will confirm if can end the
report and print the final results thru RS 232.
<ESCAPE>
<ENTER>
15
6.4.
Press key until option flashes, then
press key to confirm the option chosen.
Press key until option flashes, then
press key to confirm the option chosen.
Equipment Operation pH - Check
<SELECT> pH
<ENTER>
<SELECT> Check
<ENTER>
SELECT FUNCTION
mV ºCpH
pH: READ /
SET UP/CHECK
ELECTRODE
CHECK
Dip electrode into 7.00pH Buffer. This buffer value was
chosen at Set Up Operation.
When ready, press key.
Wait.
Remove the electrode from 7.00pH Buffer and wash it
using deionized water. When finished, press
key.
Dip electrode into 4.01pH Buffer. This buffer value was
chosen at Set Up Operation.
When ready press key.
Wait.
The Sensitivity of the electrode will be displayed.
The analysis program will then
display the electrode sensibility
and its condition or any problem
that might occur with it.
<ENTER>
<ENTER>
<ENTER>
Good Electrode
ELECT.:VERY GOOD
<ENTER>
WASH ELECTRODE
PLACE ELECTRODE
BUFFER 7.OOpH
READY?
============
====
WASH ELECTRODE
READY?
PLACE ELECTRODE
BUFFER 4.01pH
READY?
============
Electrode with problem
ATTENTION:CHECK
ELECTRODE
CHEK SOLUTION
Sensitivity above 90% - Very Good
Sensitivity below 90% and above 80% - Good
Sensitivity below 80% - Bad
READY?
<ENTER>
ELECTRODE
HIGH ISO<ENTER>
WASH ELECTRODE
w/THIOUREA
& PEPSIN
PERSISTING BAD
CONTACT OMEGA
CUSTOMER SERVICE
(800) 872-9436
<ENTER>
16
6.5.
Equipment Operation pH - Register
Perform this function if user desires to store the results while Reading
<SELECT> pH
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
<SELECT> Read
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
<SELECT> Register
Press key until option flashes,
then press key to confirm the option
Press key until option flashes, then
press key to confirm the option chosen.
Dip electrode into sample, then press key to
continue reading operation.
Example for Reading, when the bargraph was chosen
during Set Up Mode.
Register 01 was stored, press key to move
to next reading and store them.
<ENTER>
<SELECT> Read
<ENTER>
<ENTER>
<ENTER>
SELECT FUNCTION
mV ºCpH
READ
pH: /
SET UP/CHECK
pH: READ /
CALIBRATE/REG
READ
REG: /
CONSULT/ERASE
GO TO SAMPLE!
Ready?
============
REGISTER: 01
WAIT
Indicates when the
Bargraph was not chosen
during Set Up Mode.
99% 25.0ºC
16.53pH @ 25ºC
Perform this function if user desires to consult the results stored
<SELECT> pH
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
<SELECT> pH
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
<SELECT> Register
Press key until option flashes,
then press key to confirm the option
Press key until option flashes,
then press key to confirm the option
Press key until chosen option flashes, then
press key to confirm the option chosen.
Press key to consult the next registered
reading.
<ENTER>
<SELECT> Consult
<ENTER>
<SELECT>
<ENTER>
<ENTER>
SELECT FUNCTION
mV ºCpH
pH: /
READ
SET UP/CHECK
pH: READ /
CALIBRATE/REG
REG: READ /
/ERASECONSULT
CONSULT
/DISPLAY PRINTER
REG:01 25.0ºC
->3.58pH @ 25ºC
User can display the results
thru the display or printer.
17
6.5.
Equipment Operation pH - Register (cont.)
Perform this function if user desires to earse all data stored
<SELECT> pH
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
<SELECT> Read
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
<SELECT> Register
Press key until option flashes,
then press key to confirm the option
Press key until option flashes, then
press key to confirm the option chosen.
Re-confirm option chosen. This is the last chance not
To erase ALL data stored. After this point, if chosen to
erase, ALL data will be lost!
<ENTER>
<SELECT> Erase
<ENTER>
SELECT FUNCTION
mV ºCpH
READ
pH: /
SET UP/CHECK
pH: READ /
CALIBRATE/REG
REG: READ /
CONSULT/ERASE
CONFIRM?
/ Yes No
18
6.6.
Equipment Operation mV - Set Up
<SELECT> mV
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
<SELECT> Set Up
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
A password is required to access the Set Up mode.
Press in sequence ,, .<SELECT> <ENTER> <ESCAPE>
Program will display the battery life left.
User has the option to choose the desired language.
Press key until the desired option flashes,
then press key to confirm the option chosen.
Select the Resolution by pressing key.
Option chosen will flash. Then press key to
confirm option chosen.
Option to choose the Calibration Standard value.
Refer to page 12 on how to adjust this value.
<SELECT>
<ENTER>
This Screen is default and cannot be changed.
<SELECT>
<ENTER>
SELECT FUNCTION
pH ºCmV
mV: READ /
/CHECKSET UP
PASSWORD
___
BATTERY
============
LANGU.: PORTUG./
/SPANISHENGLISH
RANGE
-1999 to +1999mV
RESOLUTION
0.1 0.01
CALIBRATION
228mV @ 25ºC <>
User can instruct the instrument to inform that
calibration is needed.
User can program the number of readings, before
instrument prompts for calibration. Refer to page 12
on how to adjust the number.
User can choose between the following Reading Modes:
Continuous - Read continuously after time is set
Average - Reads the average after time is set
Hold - user must press key to Read
User can program the time between Readings. Refer to
Page 12 for instructions on how to adjust this time.
<ENTER>
CAL.INFORMATION?
/ Yes No
INFORM WITH:
200 READINGS <>
READ MODE
//CONT AVER. HOLD
TIME BETWEEN
READINGS 5s <>
A
Go to Page 21
19
6.6.
Equipment Operation mV - Set Up (cont.)
From Page 20
A
User can program the display to show information like
Barr graph, Keyboard Beep Stability Beep and more.
User can choose if desire to have Barr graph shown
above the Reading screen. When Bar Graph is
displayed, the information about Sensibility and Sample
Temperature will not be displayed!
User can now adjust the Minimum and Maximum
values for the Bar Graph. Refer to Page 12.
User can choose if instrument would Beep when Stability
is reached during Read Mode or Not.
User can choose if instrument would Beep on Keyboard
touch or Not.
During this sequence, user will be able to choose alarms
and also adjust it’s values.
Will be able to choose if RS 232 is needed and if
connected to a PC or a Printer.
Press key until desired option flashes, then
<SELECT>
press key to confirm the option chosen.
<ENTER>
In order to adjust the values, refer to page 12.
DISPLAY?
/ Yes No
BARGRAPH?
/ Yes No
Min: -500mV
Max: 500mV <<>>
BEEP ON STABIL.?
/ Yes No
KEYBOARD BEEP?
/ Yes No
MAX. ALARM?
/ Yes No
MAX. VALUE:
500.0mV <>
MIN. ALARM?
/ Yes No
Printing Mode
CONT.: Print continuously (based on the
printing interval chosen)
MAN.:
Prints the Read value just after
pressing key. But only after the
read value is stabilized (an arrow is displayed).
STAB.: Prints only one time, after the
reading is stabilized (an arrow is displayed).
<ENTER>
MIN. VALUE:
-500.0mV <>
RS-232 OUTPUT?
/ Yes No
RS-232 OUTPUT:
/ PC PRINTER
SPEED (100 bps)
24 48 9612
============
====
Go to Page 22
Go to Page 22
A
SPEED (100 bps)
24 48 9612
PRINTING MODE
//Cont Man Stab
PRINTING INTERVAL 5s
<>
STATISTICS?
/ Yes No
A
20
6.7.
Equipment Operation mV - Calibration
<SELECT> mV
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
<SELECT> Read
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
Press key until option flashes,
<SELECT> Calibrate
then press key to confirm the option
If a thermo is attached to the instrument, Manual will
be displayed and user will have the option to adjust the
Temperature Compensation. Refer to page 12.
Dip electrode into 228mV Standard. This buffer value
was chosen at Set Up Operation.
Wait.
The sensibility of the electrode will be displayed.
Wash the electrode using deionized water, then press
<ENTER>
User will now be able to choose the reading in
Absolute or Relative.
<ENTER>
key.
GO TO SAMPLE!
READY?
SELECT FUNCTION
pH ºCmV
mV: /
READ
SET UP/CHECK
mV: READ /
/REGCALIBRATE
TEMP. COMP.:Man
25ºC <>
PLACE ELECTRODE
SOL.228mV @ 25ºC
============
====
SENS.=100.0%
WASH ELECTRODE
READY?
READ
/ABS. REL.
LET ZERO!
READY?
Dip the
electrode into
the relative
sample, to
tare, then
press
<ENTER>
key.
The reading will be displayed.
If user press and hold key in order to exit
the reading Mode, program will confirm if can end the
report and print the final results thru RS 232.
->202.0mV ABS ->228 mV ABS
END REPORT?
/ Yes No
<ENTER>
228 mV ABS
GO TO SAMPLE!
READY?
->0.0 mV ABS
END REPORT?
/ Yes No
<ESCAPE>
21
6.8.
Equipment Operation mV - Read
SELECT FUNCTION
GO TO SAMPLE!
READY?
pH ºCmV
READ
mV: /
SET UP/CHECK
READ
mV: /
CALIBRATE/REG
READ
/ABS. REL.
LET ZERO!
READY?
<SELECT> mV
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
<SELECT> Read
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
<SELECT> Read
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
User will now be able to choose the reading in
Absolute or Relative.
->202.0mV ABS ->202.0 mV ABS
END REPORT?
/ Yes No
<ENTER>
202.0 mV ABS
Dip the electrode into the relative
sample, to tare, then press
<ENTER> key.
At this screen, if user presses
<SELECT>
the Temperature Compensation, if no
thermo is attached to the instrument!
key, he will be able to adjust
GO TO SAMPLE!
READY?
MIN. ALARM:
100.0 mV REL
END REPORT?
/ Yes No
The reading will be displayed.
If user press and hold key in order to exit
the reading Mode, program will confirm if can end the
report and print the final results thru RS 232.
<ESCAPE>
22
6.9.
Equipment Operation mV - Check
<SELECT> Check
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
Dip electrode at the Standard. This standard value was
chosen at Set Up Operation.
When ready, press key.
Wait.
The Sensibility of the electrode will be displayed.
The analysis program will then
display the electrode sensibility
and its condition or any problem
that might occur with it.
<ENTER>
Good Electrode
ELECTR.:VERY GOOD
<ENTER>
WASH ELECTRODE
mV: READ /
SET UP/CHECK
ELECTRODE
CHECK
PLACE ELECTRODE
SOL.228mV @ 25ºC
READY?
============
====
CHECK
RESULT
Electrode with problem
PLACE ELECTRODE
SOL.228mV @ 25ºC
============
Sensibility above 90% - Very Good
Sensibility below 90% and above 80% - Good
Sensibility below 80% - Bad
READY?
===
WASH ELECTRODE
READY?
PLACE ELECTRODE
SOL.228mV @ 25ºC
============
====
CHECK
RESULT
BAD ELECTRODE
<ENTER>
PLACE ELECTRODE IN
30% HCl
FOR 30s
PERSISTING BAD
CONTACT OMEGA
CUSTOMER SERVICE
(800)872-9436
<ENTER>
23
6.10.
Equipment Operation mV - Register
Perform this function if user desires to store the results while Reading
<SELECT> mV
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
<SELECT> Read
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
<SELECT> Register
Press key until option flashes,
then press key to confirm the option
Press key until option flashes, then
press key to confirm the option chosen.
User will now be able to choose the reading in
Absolute or Relative.
<ENTER>
<SELECT> Read
<ENTER>
GO TO SAMPLE!
READY?
============
====
SELECT FUNCTION
pH ºCmV
READ
mV: /
SET UP/CHECK
mV: READ /
CALIBRATE/REG
READ
REG: /
CONSULT/ERASE
READ
/ABS. REL.
============
LET ZERO!
READY?
====
<ENTER>
Dip the electrode
into the relative
sample, to tare,
Then press
<ENTER> key.
============
REGISTER: 01
WAIT
202.0 mV ABS
GO TO SAMPLE!
READY?
====
24
6.10.
Equipment Operation mV - Register (cont.)
Perform this function if user desires to consult the results stored
<SELECT> mV
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
<SELECT> Read
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
<SELECT> Register
Press key until option flashes,
then press key to confirm the option
Press key until option flashes,
then press key to confirm the option
Press key until chosen option flashes, then
press key to confirm the option chosen.
Press key to consult the next registered
reading.
<ENTER>
<SELECT> Consult
<ENTER>
<SELECT>
<ENTER>
<ENTER>
SELECT FUNCTION
pH ºCmV
mV: /
READ
SET UP/CHECK
mV: READ /
CALIBRATE/REG
REG: READ /
/ERASECONSULT
CONSULT
/DISPLAY PRINTER
REG:01 25.0ºC
->202.0mV REL
REG:n 25.0ºC
->210.0mV REL
Perform this function if user desires to earse all data stored
<SELECT> pH
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
<SELECT> Read
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
<SELECT> Register
Press key until option flashes,
then press key to confirm the option
Press key until option flashes, then
press key to confirm the option chosen.
Re-confirm option chosen. This is the last chance not
To erase ALL data stored. After this point, if chosen to
erase, ALL data will be lost!
<ENTER>
<SELECT> Erase
<ENTER>
SELECT FUNCTION
pH ºCmV
mV: /
READ
SET UP/CHECK
mV: READ /
CALIBRATE/REG
REG: READ /
CONSULT/ERASE
CONFIRM?
/ Yes No
25
6.11.
Equipment Operation ºC - Set Up
<SELECT> ºC
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
<SELECT> Set Up
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
A password is required to access the Set Up mode.
Press in sequence ,, .<SELECT> <ENTER> <ESCAPE>
Program will display the battery life left.
User has the option to choose the desired language.
Press key until the desired option flashes,
then press key to confirm the option chosen.
Select the Resolution by pressing key.
Option chosen will flash. Then press key to
confirm option chosen.
User can choose between the following Reading Modes:
Continuous - Read continuously after time is set
Average - Reads the average after time is set
Hold - user must press key to Read
User can program the time between Readings. Refer to
Page 12 for instructions on how to adjust this time.
<SELECT>
<ENTER>
This Screen is default and cannot be changed.
<SELECT>
<ENTER>
<ENTER>
SELECT FUNCTION
mV pH ºC
ºC: READ /
SET UP
PASSWORD
___
BATTERY
============
LANGUA: PORTUG./
/SPANISHENGLISH
RANGE
-20 to 130ºC
RESOLUTION
/ 0,11
READING MODE
//CONT AVER. HOLD
TIME BETWEEN
READINGS 5s <>
A
Go to Page 28
26
6.11.
Equipment Operation ºC - Set Up (cont.)
From Page 27
A
User can program the display to show information like
Barr graph, Keyboard Beep Stability Beep and more.
User can choose if desire to have Barr graph shown
above the Reading screen. When Bar Graph is
displayed, the information about Sensibility and Sample
Temperature will not be displayed!
User can now adjust the Minimum and Maximum
values for the Bar Graph. Refer to Page 12.
User can choose if instrument would Beep when Stability
is reached during Read Mode or Not.
User can choose if instrument would Beep on Keyboard
touch or Not.
During this sequence, user will be able to choose alarms
and also adjust it’s values.
Will be able to choose if RS232 is needed and if
connected to a PC or a Printer.
Press key until desired option flashes, then
<SELECT>
press key to confirm the option chosen.
<ENTER>
In order to adjust the values, refer to page 12.
DISPLAY?
/ Yes No
BARGRAPH?
/ Yes No
Min: 0ºC
Max: 100ºC
<
>
<
BEEP ON STABIL.?
/Yes No
KEYBOARD BEEP?
/ Yes No
MAX. ALARM?
/ Yes No
MAX. VALUE:
100ºC <>
MIN ALARM?
/ Yes No
>
Printing Mode
CONT.: Print continuously (based on the
printing interval chosen)
MAN.:
Prints the Read value just after
pressing key. But only after the
read value is stabilized (an arrow is displayed).
STAB.: Prints only one time, after the
reading is stabilized (an arrow is displayed).
<ENTER>
MIN. VALUE:
0.0ºC <>
RS-232 OUTPUT?
/ Yes No
RS-232 OUTPUT:
/ PC PRINTER
SPEED (100 bps)
24 48 9612
»»»»»»»»»»»»»»»»
WAIT
End
X
SPEED (100 bps)
24 48 9612
PRINTING MODE
//Cont Man Stab
PRINTING INTERVAL 5s
<>
STATISTICS?
/ Yes No
A
Go to Page 29
27
6.11.
If user is changing or adding a Thermo to the
instrument, it is necessary to adjust the temperature
of the probe with the instrument.
If changing or adding a Themo, choose , then
choose again to confirm.
Equipment Operation ºC - Set Up (cont.)
Yes
Yes
From Page 28
A
ATC CHANGE?
/ Yes No
CONFIRM?
/ Yes No
First find out the any sample temperature. Then adjust
the temperature at the screen, to match the sample
temperature being used. Refer to page 12 for
instruction on how to modify this value.
Dip the thermo into the used sample, then press
<ENTER> key.
THERMOSTATIZE
THERMO @25.0ºC<>
THERMOSTATIZE
THERMO @ 25ºC<E>
WAIT
X
END
28
6.12.
Equipment Operation ºC - Read
<SELECT> ºC
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
<SELECT> Read
Press key until option flashes, then
<ENTER>
press key to confirm the option chosen.
Dip the electrode into the sample, then press
<ENTER> key.
The reading will be displayed.
If user press and hold key in order to exit
the reading Mode, program will confirm if can end the
report and print the final results thru RS 232.
<ESCAPE>
SELECT FUNCTION
pH mV ºC
ºC: / SET UPREAD
GO TO SAMPLE!
Ready?
> 25ºC
END REPORT?
/ Yes No
29
6.13.
Equipment Operation - Turning Off
While during Read Mode, user must press and hold key
<ESCAPE>
and the Select Function Menu will be displayed.
Press key and user will be guided to the Switching Off
<ESCAPE>
Screen.
Reading display, when the
bargraph function was not
chosen durign Set Up Mode.
Example for Reading, when the bargraph was chosen
during Set Up Mode.
The End Report screen will only be displayed if user
had chosen to use RS 232 during Set Up Mode.
If user press and hold key in order to exit
the reading Mode, program will confirm if can end the
report and print the final results thru RS 232.
Press key.<ESCAPE>
<ESCAPE>
============
====
END REPORT?
/ YES NO
SELECT FUNCTION
pH ºCmV
800m 23.2ºC
-> 8.7%
<ESCAPE>
Press key until option flashes, then
<SELECT> Yes
press key to confirm the option chosen.
<ENTER>
SWITCH OFF
/ YES NO
GOOD BYE!
?
30
7.
PH Electrode Type
Electrode Description
pH sensing Bulb
1 - - rugged construction, in order to avoid ease breakage.
Glass Body
2 - - chemically inert.
Punctual Ceramic
3 - .
Seal
4 - - ease operation for electrolyte solution filling.
Low Noise Cable
5 - - assuring stable readings..
Polypropylene Cap
6 - - chemically aggressively resistant.
7 - - avoid contamination with solutions that contain Silver, Mercury, Sulfite, etc.
Ionic Barrier
Avoid AgCl preciptations. Provides quick readings on temperature variations.
8 - - contains reference electrolyte solution for transportation or storage.
Transportation Cap
9 - (on refillable electrodes only).
Electrolyte Fill Hole
10 -
Argental Reference.
Electrode Usage Instruction
DIAPHRAGM
BULB (1)
TRANSPORT CAP (8)
(3)
1 - Before using the electrode, verify it’s body for possible mechanical defects or cracks
and in case it occur, replace it immediately.
2 - Take off the transportation cap and rinse the electrode with distilled water, remove
eventual crystallization at the diaphragm (3). The transportation cap must always be
used when transporting the electrode, avoiding dehydration of the bulb (1).
3 - Remove the seal (4) in order to establish Atmospheric Pressure (only applicable for
refillable electrodes) and cl o s e it ag a i n .
4 - Eliminate possible air bubbles that may occur internally at the bulb (1), by shacking
the electrode vertically.
5 - On Refillable electrodes, the electrolyte level must be at a maximum of 10 mm
below the hole (9).
6 - Always refill, when necessary, the electrolyte level with 3 MKCl thru the hole (9). On
Bridge Electrolytic Electrodes, with the proper bridge (see table 1) thru the hole (9).
7 - When the Electrode is not in use, always immerse into electrolyte reference.
8 - To measure, just immerse the electrode into the sample, covering the diaphragm (3).
9 - Switching from one solution to other, always wash electrode with distilled water.
REFILL HOLE
(9)
SEAL
(4)
31
8.
CLEANING:
Maintenance
CONSIDERATIONS:CONSIDERATIONS:
32
8.
1 - For storage purpose, electrodes must be immerged at the same electrolyte’s reference, with hole(9) closed.
2 - In order to avoid mistakes during readings, the membrane (1) and the diaphragm (3), must be always clean.
3 -For cleaning, wash the electrode with commercial detergent using your fingers to clean the bulb, rinse it with
distilled water. Rest the electrode for 15 minutes into Thiourea Solution and for 15 minutes in PEPSIN..
4 - If necessary, dip the electrode for 5 minutes in HCl 0.1N and 5 minutes in NaOH 0.1N. Repeat this operation and
just after it rest the electrode for 30 minutes in 3 MKCl.
5 - In case you noticed that the internal electrolyte reference is hazel or is contaminated, proceed with a internal
clean up! Take off the internal reference by the hole(9), using a syringe and wash it internally with distilled water, by
shaking the electrode vertically. Repeat this operation for 3 times. Then refill the electrode with 3m KCL.
6 - The membrane (1)must be manually cleaned with absorbent paper or cotton, any grease can be eliminated with
benzine or any solvent.
7 -For tougher dirt, use chloride acid 0,1N and or sulficromic solution. Then leave it dipped for 12 hours in 3 MKCl
Solution.
8 - Dried membranes, must be immerged for 30 seconds in HF (1-2%) solution, for Gel renewal. Then dip it for 12
hours in 3 MKCl solution.
Maintenance (cont.)
33
9.
Communication Cable
E
34
M-4507/0908
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