Cole Parmer pH 550 User manual

OPERATION MANUAL
pH 550 (Cat. No. 0580218)
MICROCOMPUTER BASED
pH /Te perature
CONTROLLER
625 East Bunker CT
Vernon Hills, IL 60061-1844
Phone: [phone]
Fax: [phone]
E- ail: info@colepar er.co
www.colepar er.co
06/0012Rel1

2
CONTENTS Page
I. INITIAL INSPECTION 3
MOUNTING PROCEDURE 3
II. GENERAL INTRODUCTION 4
III. USING THE pH 550 5
A. FRONT(KEYPAD) PANEL 5
B. MAIN DISPLAY MODE 6
C. REAR CONNECTORS 7
D. TURNING ON/OFF THE INSTRUMENT 9
IV. MODEL MODES 10
A. MAIN DISPLAY MODE 10
B. CALIBRATION/SETTING MODE 10
How to use the keys 11
a. CHECK PASSWORD page 12
b. USER SETTING page 12
c. pH CALIBRATION page 13
Step by step pH Calibration 14
d. pH CONTROL SETTING page 15
e. pH CURRENT SETTING page 16
f. TEMP. CURRENT SETTING page 16
g. TEMP. CONTROL SETTING page 17
V. CONTROLLING THE RELAYS 18
A. ISOLATION VOLTAGE 18
B. OUTPUT LOAD 18
C. RELAY ACTION,SET POINT &HYSTERESIS 18
D. pH RELAYS 19
E. TEMPERATURE RELAY 20
VI. 4-20 mA OUTPUT 20
A. ISOLATION VOLTAGE 20
B. OUTPUT LOAD 20
C. pH & TEMP LINEAR OUTPUT 20
D. pH ANTILOG OUTPUT 21
VII. RS485 INTERFACE OPERATION 22
A. INTRODUCTTION 22
B. PREPARING THE METER 22
VIII.ERROR DISPLAYS AND TROUBLESHOOTING 23
IX. pH BUFFERS 24
X. SPECIFICATIONS 25

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I. INITIAL INSPECTION
Carefully unpack the instru ent and accessories. Inspect for
da ages ade in ship ent. If any da age is found, notify your
Cole-Par er representative i ediately. All packing aterials
should be saved until satisfactory operation is confir ed.
MOUNTING PROCEDURE
1. Make a cutout
on any panel, with
a thickness of 1/16
in. (1.5 ) to 3/8
in. (9.5 ).
2. Re ove the
ounting
asse bly fro
the controller
and insert the
controller into
the cutout.
3. Replace the
ounting
bracket asse bly onto the controller and secure the controller to
the ounting panel.
Warning :
If the equip ent is used in a anner not specified by the
anufacturer, the protection provided by the equip ent ay be
i paired.
Cleaning the instr ment :
3.66"
0.04
0.00
93.00mm▒
1.00
0.00 93.00mm▒
3.66"
0.00
0.00
1.00
0.04
0.04"R(1.0mm) MAX.
PANEL CUTOUT DIMENSIONS

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1. Be sure to re ove the power before atte pting to clean the
eter.
2. Use a lint free cloth and clean water or neutral detergent.
3. Wipe the outer surface of the instru ent only.
4. Wipe dry the instru ent before power again.
II. GENERAL INTRODUCTION
The Cole-Par er pH 550 (pH and Te perature) Syste is a rugged
icroprocessor based instru ent asse bled in a watertight ¼ DIN
case, designed for use in laboratories and process control
applications.
The pH 550 icroprocessor allows the user to easily recalibrate the
para eters for the probes. The icroprocessor also perfor s a self-
diagnostic routine every ti e you turn on the unit providing you
with basic infor ation about the stability of the instru ent.
The syste si ultaneously displays pH, Te perature, Alar status
and current output in one LCD graphic screen. The LCD also
includes a backlight for dark environ ents. This syste uses glass
electrode for the pH and a precise ther istor for te perature
providing you with accurate readings for all your easure ents.
The pH 550 is equipped with three progra able high or low
relays for pH and one progra able high or low relay for
te perature; all relays are hysteresis driven. The syste also has
two isolated 4-20mA analog output, offset and span configurable
for the pH & te perature display.
The pH 550 co es with a RS485 interface that can easily let the user
log all data with an IBM
©
PC/AT co patible co puter.

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III. USING THE pH 550
A. FRONT PANEL
NEED to crop o t Jenco and Model no from pict re below.
1. The [MODE /-] key.
1a. In Main
Display mode this key
has no function.
1b. In
Calibration/Setting
ode this key will
ove to the next
digit of the current
active para eter.
1c. In
Calibration/Setting
ode, pressing this
key for two seconds
will ove you back to the previous para eter.
2. The [CAL / VIEW] key.
2a. Pressing this key for about two seconds, during ain
display ode will switch to Calibration/Setting ode.
2b. During Calibration/Setting ode this key will switch to
the next available Calibration/Setting page. Pressing this key
at the last User/Calibration page will return the user to the
ain display ode.
3. The [  ] UP key.
During Calibration/Setting ode this key will increment the
current blinking digit of the active para eter.
4. The [
 /pH-Recal.] DOWN/pH Recalibrate key.

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4a. During Calibration/Setting ode this key will decrement
the blinking digit of the active para eter.
4b. During pH calibration, instead of SAVING the new pH
Stand or Slope you can press this key to recalibrate the buffer
again.
5. The [ ↵ ] ENTER key.
During Calibration/Setting ode, this key will save the
current odified para eter and ove to the next para eter.
6. The [ ] LIGHT key.
This key will turn on or turn off the backlight of the LCD.
The backlight will auto atically turn off if there is no key
activity within two inutes.
7. LCD screen.
B. MAIN DISPLAY MODE
1. pH mA OUT - this will
display the output of the pH 4-
20 A circuit.
2. TEMP mA OUT - this will
display the output of the
Te perature 4-20 A circuit.
These two current outputs at
power on will show “OFF” for
about three seconds before going
to ain display ode. After exiting the Calibration /Setting pages a
“FROZEN” essage will be displayed for about 3 seconds if the
unit is not password locked.
3. annunciator - This will be displayed if Calibration
/Setting pages are password locked eaning the user
can’t calibrate or change the settings unless the correct 4 digit
nu ber has been entered, but user still can view all the settings.

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4.H1 (High action relay 1) or L1 (Low action relay 1) annunciator -
this is the status of the pH Relay 1, if this is displayed then the
Relay is ON. H1 eans the relay action is HIGH while L1 eans
the relay action LOW.
5. H2 (High action relay 2) or L2 (Low action relay 2)annunciator –
function is sa e with RELAY 1.
6. H3 (High action relay 3) or L3 (Low action relay 3)annunciator –
function is sa e with RELAY 1.
7. H4 (High action relay 4) or L4 (Low action relay 4)annunciator –
this is the status of the Te perature Relay 4, if this is displayed
then the Relay is ON. H4 eans the relay action is HIGH while L4
eans the relay action LOW.
8. pH Display.
9. Temperat re Display.
C. REAR CONNECTORS
Before wiring the probes, relays, analog output, RS485 and power
cord be sure that you are connecting to the right ter inal as shown
below. Re e ber that the unit is ON once the user plugs in the
power cord to an AC power supply.

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1. Connect the AC line to the rear of the instru ent. The odel
550 can be used with 115 or 230VAC 50/60 Hz. Power
consu ption is 6 watts. Make sure the EARTH connector is
connected to the earth lead of the AC power line.
2. Connect the proper load to the output relays. Make s re that the
load does not exceed the relay rating, 5 Amp at 115VAC and 2.5
Amp at 230 VAC.
3. Set the proper load to the 4-20 A output connector. Make sure
that the load i pedance is less than 500 Oh s.
4. A +5VDC and -5VDC ( ax 20 A for each) output to provide
excitation voltage for pH pre-a plifier.
CAUTION:
MAKE SURE YOU CONNECT THE AC POWER CORD TO
THE CORRECT AC TERMINALS. CONNECTING INCORRECTLY
MAY DAMAGE THE UNIT PERMANENTLY.
D. TURNING ON/OFF THE INSTRUMENT
By just plugging the unit to a
correct AC voltage the unit will
be ready for use. There is no
Power key so unplugging and
plugging the unit will turn OFF
or turn ON the unit respectively.
After the unit is turned on, it
will perfor so e basic self-
diagnostics and will display

9
“OK” or “BAD”. If you received any “BAD” essages turn OFF
the unit and turn it ON again. (See VIII. ERROR DISPLAYS AND
TROUBLESHOOTING).
If the essage persists then you ight need to call our Applications
depart ent.
After the self-diagnostic is co plete the te perature will be
displayed on the lower part of the LCD screen and you are ready to
ake pH calibration or easure ents. Just i erse the probes
halfway to the buffer or liquid. If possible do not allow the probes
to touch any solid object in the buffer or solution. There should be
no air bubbles around the probes either. Shaking or oving the
probes vigorously before recording any easure ent will dislodge
any bubbles for ed in the probes.
IV. MODEL pH 550 MODES
A. MAIN DISPLAY MODE
Turning ON the unit will
always start in ain display
ode.
This instru ent is designed
to provide two distinct
easure ents:

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1. Temperat re - current te perature of the solution.
2. pH - the current degree
of acidity or alkalinity of the
solution with auto atic te perature co pensation.
B. CALIBRATION/SETTING MODE
Pressing the [CAL/VIEW] key for about two seconds during ain
display ode will bring-up the first page of seven pages of the
Calibration/Setting ode. Pressing [CAL/VIEW] key will switch to
the next page until the last page, where pressing [CAL/VIEW] again
will return the user to ain display ode.
Upper drawing is a si ple flowchart showing the path of the
[CAL/VIEW] k

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How to se the keys
1. At MAIN DISPLAY you need to press and hold the [CAL/VIEW]
key for two seconds to change the display to VIEW SETTING PAGE
or if the instru ent is password locked the display will be
PASSWORD CHECK page.
2. You can change any blinking options or digit by pressing the
[  ] or [  ] keys.
3. During pH STAND & SLOPE calibration you can press [  /pH-
Recal.] key to recalibrate the buffer again.
4. For options in digit for at you need to press the [MODE/-]
key to ove the cursor to the next digit .
5. If you are satisfied with the selection you ade you need to
press the [ ↵ ] ENTER key to save the changes and ove to the next
option.
6. If you don’t need to change the current blinking option, just press
the [ ↵ ] ENTER key to ove to the next selection.
7. You also can press and hold [MODE/-] key for two seconds and
it will ove back the cursor to the previous option.
a. PASSWORD CHECK
You will only see this page if
the unit is password locked. To
change any settings or calibration
you need to unlock the syste to
re ove the “PASSWORD
LOCKED” essage. You need to
enter the correct 4-digit nu ber
on the “ENTER PASSWORD”
input. You can still view all the
pages of Calibration/Setting mode if the syste is password locked
by just pressing the [CAL/VIEW] key on this page. If the unit is

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“PASSWORD LOCKED” going to Calibration/Setting mode will
not affect the function of the relays.
CAUTION: If the unit is not locked then every ti e the user enters
the Calibration/Setting mode the relays and analog out will be
frozen.
b. USER SETTING page
You will only see this page if the
unit is not password locked. This
page is just a WARNING, telling
you that all relays are frozen,
and that you can calibrate and
change the settings.
NOTE: FROZEN MEANS ALL THE RELAYS AND THE ANALOG
OUT WILL MAINTAIN THEIR LAST STATE UNTIL THE USER
RETURNS TO MAIN DISPLAY MODE.
c. pH CALIBRATION
ATC TEMP. – the current
te perature of the solution.
1. BUFFER 1 - in this option you
can select which buffer to use for
the standardization calibration.
You can choose 7.00 pH or
6.86 pH by using the [  ] and
[
 ] keys and pressing the [ ↵ ] key
to save your choice.

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2. BUFFER 2 - after you selected the buffer 1 this option will let you
select the second buffer to use to calibrate the slope. You can choose
4.00 pH, 4.01 pH, 9.18 pH or 10.01 pH by using [  ] and [  ] keys
and pressing the [ ↵ ] to save your choice.
3. STAND - this is the actual pH calibration process, this line will
display the buffer to be used for STAND (OFFSET) calibration,
depending on the choice you ade on BUFFER 1 . (See Step by step
pH Calibration.)
4. SLOPE - this is part 2 of the pH calibration process, this line will
display the buffer to be used for SLOPE calibration, depending on
the choice you ade on BUFFER 2. (See Step by step pH
Calibration.)
EFFICIENCY -After saving the SLOPE a new efficiency will be
displayed for about 4 seconds and then will ove to the next page.
Efficiency = (new slope/ ideal slope) x 100%
We reco end that you use a new electrode, if the electrode
efficiency is lower than 80%.
Step by step pH calibration
1. Press the [CAL/VIEW] key to go to pH Calibration page. If the
unit is password locked, re ove the password lock first.
2. Select buffer 1 (7.00 or 6.86), by using the [  ] or [  /pH-Recal.]
keys, then press the [ ↵ ] key to save your selection.
3. Select buffer 2 (4.00,4.01,9.18 or 10.01), by using the [  ] or
[  /pH-Recal.] keys, then press the [ ↵ ] key to save your selection.
4. Clean the pH electrode and te perature probe with de-ionized or
distilled water.
5. Place the pH electrode and Te perature probe into buffer 1.

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6. Press the [ ↵ ] key. A “WAIT” essage will blink indicating that
the instru ent is waiting for a stable reading. The display will be
locked to the buffer value corresponding to the te perature of
buffer 1 (See IX. pH B ffers). When a stable reading is reached, the
unit will blink a “SAVE” essage.
7. Press the [ ↵ ] key to save the STAND calibration and prepare to
do a SLOPE calibration or press the [  /pH-Recal.] key to
recalibrate buffer 1 and repeat fro step 6.
If “OVER” or “UNDER” (See VIII. ERROR DISPLAYS AND
TROUBLESHOOTING) is displayed or a blinking “SAVE” does
not show after ore than few inutes then so ething is wrong
with your buffer 1 or electrode. Be sure your buffer 1 is correct or
change a new electrode and repeat fro step 4.
8. Clean the pH electrode and te perature probe with the de-
ionized/distilled water.
9. Place the pH electrode and Te perature probe into buffer 2.
10. Press the [ ↵ ] key. A “WAIT” essage will blink indicating that
the instru ent is waiting for a stable reading. The display will be
locked to the buffer value corresponding to the te perature of
buffer 2 (See IX. pH B ffers). When a stable reading is reached, the
unit will blink a “SAVE” essage.
10. Press the [ ↵ ] key to save the SLOPE calibration or press the
[  /pH-Recal.] key to recalibrate buffer 2 and repeat fro step 8.
If “OVER” or “UNDER” (VIII. ERROR DISPLAYS AND
TROUBLESHOOTING ) is displayed or a blinking “SAVE” does
not show after ore than few inutes then so ething is wrong
with your buffer 2 or electrode. Be sure your buffer 2 is correct or
change a new electrode and repeat fro step 4.
11. Set-up your Relay, A OUT and Te perature control.
12. The unit is ready for easure ent and control.

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d. pH CONTROL SETTING
1. HI or LO RELAY 1 –
The action for this relay can
Progra able to High or
Low control. If in HI-action
the relay will turn ON when
the pH is greater or equal to
RELAY 1 set point, which is
odified by the hysteresis
value. (See chapter V.
CONTROLLING THE
RELAYS ).
User can use [  ] and [  /pH-Recal.] keys to select the relay action
then press [ ↵ ] key to save the setting.
Use [  ] and [  /pH-Recal.] keys to change the blinking digit, use
the [MODE/-] key to select another digit and the [ ↵ ] key to save the
new set point value.
2. HI or LO RELAY 2 – function & setting procedures sa e with
RELAY 1
3. HI or LO RELAY 3 - function & setting procedures sa e with
RELAY 1
4. HYSTERESIS (val e) - this is the actual value of the hysteresis.
You can change this value fro 0.00 pH to 3.99 pH. . ( See chapter
V. CONTROLLING THE RELAYS .)
e. pH CURRENT SETTING page
1. 4mA OUT – This value will be used
in conjunction with 20 A to plot the
current output. (See chapter VI. 4-20
mA OUTPUT .)
2. 20mA OUT – This value will be used
in conjunction with the 4 A value to

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plot the output. (See chapter VI. 4-20 mA OUTPUT .)
3. TRANSMITTER OUTPUT – This option would let you choose if
the current output type is linear or antilog.
The current output detailed see section C. pH & TEMP. LINEAR
CURRENT OUTPUT on page 20.
f. TEMP. CURRENT SETTING page
1. 4mA OUT – This value will be
used in conjunction with 20 A
to plot the current output. (See
chapter VI. 4-20 mA OUTPUT .)
2. 20mA OUT – This value will
be used in conjunction with the
4 A value to plot the output.
(See chapter VI. 4-20 mA
OUTPUT .)
The current output detailed see section C. pH & TEMP. LINEAR
CURRENT OUTPUT on page 20.
g. TEMP. CONTROL SETTING
1. RELAY 4 - the te perature
has only one relay to control you
need to set what action it will
use, HIGH or LOW action. . (In
HIGH-action the relay will turn
ON if the te perature is greater
or equal to RELAY4 set point, in
LOW-action the relay will turn
OFF if the te perature is less
than or equal to RELAY4 set
point, which is odified by the hysteresis value (See chapter V.
CONTROLLING THE RELAYS .)

17
2. SET POINT (For positive temperat re only)- this is the user
changeable value for the Te perature Alar relay.
3. HYSTERESIS (val e)- this is the actual value of the hysteresis.
You can change this value fro 0.0 to 19. 9°C. (See chapter V.
CONTROLLING THE RELAYS .)
4. RS 485 ID – this is the unique ID/Address for the unit. If you are
connecting ultiple odel pH 550 or other Cole-Par er odels for
logging purposes then this ID/Address ust be unique for each
connected unit. This ID/Address is the sa e address that ust be
used by the PC progra to co unicate with this unit.
5. PASSWORD SET - this is your security code if the unit is locked
the value here will not be available. You need to input the correct
code in the PASSWORD CHECK page.
CAUTION: The user is responsible in re e bering their password
nu ber otherwise you would no be able to calibrate or change the
settings.
V. CONTROLLING THE RELAYS
A. RELAY ISOLATION VOLTAGE
The axi u isolation voltage of the relay output contacts is 1500
VDC. The voltage differential between the relay output contacts and
the load should not exceed 1500 VDC.
B. RELAY OUTPUT LOAD
The current through the relay output contacts should not exceed 5
A p at 115 VAC and 2.5 A p at 230 VAC in order not to cause
per anent da age to the relay contacts. This rating is specified for
resistive loads only.
C. RELAY ACTION, RELAY SETPOINT & HYSTERESIS VALUE

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Relay
Action
Effective RELAY-ON
Set Point
Effective RELAY-OFF
Set Point
HIGH
S.P. S.P. – (H.V)
LOW
S.P S.P. +(H.V.)
S.P. = Relay Set point H.V.= Hysteresis value (Dead Band)
If the relay action is set to HIGH, the relay will turn ON at (SET
POINT), and will turn OFF at (SET POINT-HYSTERISIS).
If the relay action is set to LOW, the relay will turn ON at (SET
POINT), and will turn OFF at (SET POINT + HYSTERISIS).
The figure above shows how the relays react to user set point,
hysteresis and reading.
Fig re 1

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Note:
The ideal set point range for pH is 0.00 to 16.00 pH.
D. pH RELAYS
There are three independent Alar channels for pH display. (see
fig re 1.). The hysteresis value will be used by three pH relays.
The action of the pH relays is dependent on set point, relay
action type (HIGH or LOW), hysteresis value and the current
pH display. (see fig re 1. ).
E. TEMPERATURE RELAY
One relay channel is available for te perature display which has
independent set point, action (see fig. 1) setting ( HIGH or LOW )
and hysteresis value.
The action of the Te perature relay is dependent on set point,
relay action (HIGH or LOW), hysteresis value and the current
Te perature display. (See fig. 1).
VI. 4 - 20 mA OUTPUT
A. ISOLATION VOLTAGE
The axi u isolation voltage of the 4-20 A output is 500 VDC.
The voltage differential between the 4-20 A output and the load
should not exceed 500 VDC.
B. OUTPUT LOAD
The axi u load is 500Ω. Output current inaccuracies ay occur
for load i pedance in excess 500Ω.
C. pH & TEMP. LINEAR CURRENT OUTPUT

20
The pH A output will produce a linear analog output if the
user selects ‘LINEAR’ in pH A SETTING page (see fig re 2). The
te perature A output is always linear. The pH analog output is
calculated using pH_4 mA setting, pH_20 mA setting and the
c rrent pH display. An independent A OUT page for
te perature is available
The pH LINEAR & Te perature analog output is based on the
following equations respectively:
A
(pH)
= 4 A+(16 A)*(D
(pH)
- pH(4) ) / (pH(20) - pH(4))
A
(Te p)
=4 A+(16 A)*(D
(Te p)
- TEMP(4) ) / (TEMP(20) - TEMP(4))
Where:
A
(pH)
& A
(Temp)
= analog output
D
(pH)
& D( Te p ) = current pH & Te perature display
pH(4) & TEMP(4) = pH & Te perature user setting for 4 A
pH(20)& TEMP(20)= pH & Te perature user setting for 20 A.
Note :
1. The range for 4 A and 20 A settings is 0.00 to 14.99 in pH or 0
to 120 ℃ in te perature.
2. The absolute difference of the 4 A and 20 A settings ust be
greater or equal to 0.10pH in pH or 1.0℃, if less than this value the
analog output will be disabled.