Burkert 8205

Burkert 8205
BEDIENUNGSANLEITUNG REGLER 8205 .................................................... D-1
INSTRUCTION MANUAL CONTROLLER 8205 .............................................. E-1
NOTICE D'UTILISATION REGULATEUR 8205 ............................................... F-1
© BÜRKERT 1997 00557031 - Oct05 - Ind_D
Technische Änderungen vorbehalten
We reserve the right to make technical changes without notice
Sous réserve de modifications techniques
PH CONTROLLER 8205
TABLE OF CONTENTS
1
1.1
1.2
1.3
1.4
INTRODUCTION ....................................................................................................................................................... E-2
Unpacking and control ............................................................................................................................... E-2
About this manual ........................................................................................................................................ E-2
User's responsibility for safety ................................................................................................................. E-2
Electromagnetic compatibility .................................................................................................................. E-2
2
2.1
2.2
2.3
2.4
2.5
SPECIFICATION ....................................................................................................................................................... E-3
Ordering codes of the compact version ............................................................................................... E-3
Ordering codes of the separate versions ............................................................................................. E-3
Design and measuring principle .............................................................................................................. E-3
Dimensions .................................................................................................................................................... E-5
Technical data .............................................................................................................................................. E-7
3
3.1
3.2
INSTALLATION .......................................................................................................................................................... E-9
Installation guidelines ................................................................................................................................. E-9
Electrical wiring .......................................................................................................................................... E-11
3.2.1 Electrical connection recommendations (all versions) ...................................................... E-11
3.2.2 Using the cable clip .................................................................................................................... E-14
3.2.3 Wiring of the controller 8205, compact version ................................................................. E-14
3.2.4 Wiring of the controller 8205, panel-mounted version ..................................................... E-18
3.2.5 Allocation of the cable glands of the wall-mounted versions .......................................... E-19
3.2.6 Wiring of the 8205, wall-mounted version, 15-30 VDC .................................................. E-19
3.2.7 Wiring of the 8205, wall-mounted version, 115/230 VAC ............................................. E-20
4
4.1
4.2
OPERATION ............................................................................................................................................................. E-21
Controller operating and control elements ......................................................................................... E-21
Operation mode display .......................................................................................................................... E-22
4.2.1 Working rates control ................................................................................................................. E-22
4.2.2 HOLD function ............................................................................................................................. E-23
4.2.3 Calibration of pH electrode ...................................................................................................... E-23
Calibration mode ....................................................................................................................................... E-25
4.3.1 Language ....................................................................................................................................... E-25
4.3.2 Temperature units ....................................................................................................................... E-26
4.3.3 Output current .............................................................................................................................. E-26
4.3.4 Output signal 1 ............................................................................................................................ E-27
4.3.5 Output signal 2 ............................................................................................................................ E-28
4.3.6 Setpoint adjustment .................................................................................................................... E-29
4.3.7 Control mode selection ............................................................................................................. E-30
4.3.8 Alarm threshold selection .......................................................................................................... E-31
4.3.9 Hand display selection ............................................................................................................... E-32
4.3.10 Temperature compensation mode .......................................................................................... E-32
4.3.11 Filter function ................................................................................................................................ E-33
Test menu .................................................................................................................................................... E-33
4.4.1 Offset-compensation .................................................................................................................. E-34
4.4.2 Span-compensation ................................................................................................................... E-34
4.4.3 Temperature adjustment ............................................................................................................ E-34
4.4.4 pH simulation ................................................................................................................................ E-35
4.4.5 Display of electrode voltage ..................................................................................................... E-35
4.3
4.4
5
5.1
5.2
5.3
5.4
5.5
MAINTENANCE ...................................................................................................................................................... E-36
Replacement of the electrode ................................................................................................................ E-36
Storing and cleaning of the electrode ................................................................................................. E-36
Error messages .......................................................................................................................................... E-37
Factory settings of pH controller 8205 ............................................................................................... E-37
Spare parts list ........................................................................................................................................... E-38
Appendix Characteristics of PID controllers ...................................................................................... E-42
Ec conformity declaration ............................................................................................................................... F-49
E-1-
1 INTRODUCTION
PH CONTROLLER 8205
Dear Customer,
1.3 User's responsibility for safety
BEFORE INSTALLING OR USING THIS
PRODUCT, PLEASE TAKE OUR ADVICE
AND READ THE ENTIRE MANUAL
THOROUGHLY.
It is the user's responsibility to select a
controller model that is appropriate for the
application, install it properly, and maintain
all components. Special warning must be
paid to the chemical resistance of the
controller against the fluids which are
directly contacting the product.
This will enable you to fully profit from all of
the advantages offered by this product.
1.1 Unpacking and control
This symbol appears in the
manual to call special warning
to instructions that affect the
safe installation, function and
use of the product.
Please verify that the product is complete
and free from any damage.
Compare the Type specifications on the
label to the adjacent list to ensure that you
have received the proper unit. If there is
any loss or damage, please contact your
local Bürkert subsidiary.
1.4 Electromagnetic compatibility
This device fulfills the essential
requirements of te directives 2004/108/EC
(EMC) and 73/23/EC (DBT).
1.2 About this manual
This manual does not contain any warranty
statement. Please refer to our general
terms of sale and delivery.
Only properly-trained staff should install
and/or repair this product. If difficulties
should occur at the time of installation,
please contact your nearest Bürkert sales
office for assistance.
In order to comply with the directives, the
wiring instructions must be followed.
The device has been tested according to
the following EMC standards:
- EN 61000-6-3
- EN 61000-6-2
- EN 61010-1
E-2-
2 SPECIFICATION
PH CONTROLLER 8205
2.1 Ordering codes of compact pH controllers 8205
8205 compact, 4-20 mA output, 15-30 VDC, 1 alarm relay
Pulse outputs
2 relays
2 transistors
Gaskets
Electrode
FPM
FPM
Unitrode
Unitrode
Electrical
Ordering code
connection
2 x M20x1,5 cable glands
426430
2 x M20x1,5 cable glands
426450
2.2 Ordering codes of separate controllers 8205
Controller 8205, panel mounted, 4-20 mA output, 1 alarm relay
Pulse outputs
Power supply
Electrical
connection
2 relays
15-30 VDC
terminal strips
2 transistors
15-30 VDC
terminal strips
Controller 8205, wall-mounted, 4-20 mA output, 1 alarm relay
Pulse outputs
Power supply
Electrical
connection
2 relays
15-30 VDC
5 x M16x1,5 cable glands
2 transistors
15-30 VDC
5 x M16x1,5 cable glands
2 relays
115/230 VAC
5 x M16x1,5 cable glands
2 transistors
115/230 VAC
5 x M16x1,5 cable glands
Ordering code
427939
427941
Ordering code
427946
427948
427951
427953
pH sensor holders for pH controllers 8205 in separate versions: see instruction manual
"pH sensor holder 8200" (ordering code 428937)
2.3 Design and measuring principle
Design
pH controller 8205 compact
The pH-controller compactly combines a
pH-sensor and a controller with display in a
splash-proof enclosure.
The sensor component consists of a
replaceable combination pH-electrode,
screwed into the sensor housing with
screw-in threads. The measured signal is
conveyed to the controller via a coax plug.
The Pt1000 for automatic temperature
compensation is a standard feature in the
sensor housing.
The controller component converts the
measured signal, displays the actual value
and computes the command signals.
The output signals are provided via two
cable glands.
pH controller 8205, separate version
The pH transmission system combines a
pH sensor 8200, and a separate pH
controller 8205 with display.
The 8205 separate controller is available in
panel mounted version or in a wallmounted enclosure.
pH sensor 8200
The characteristics of electrodes are
described in the 8200 operating
manual.The Pt1000 for automatic
temperature compensation is available as
an option feature in pH sensor housings
type 8200.
E-3-
2 SPECIFICATION
PH CONTROLLER 8205
Measuring Principle
The most important part of a pH electrode
is the glass membrane of pH-selective
glass. When the electrode is immersed into
the solution, an electrical charge caused by
H-ions (H+) generates a cell voltage
between the glass membrane and the
solution. This electric voltage is recorded
with reference to a reference electrode,
located around the pH glass electrode. The
cell voltage of the combination electrode is
directly proportional to the pH value
(59.16 mV per pH unit at 25°C).
ACID BASE
Fig. 2.1
The controller functions in a 3-wire circuit
and requires a power supply of 15-30 VDC.
A relay alarm contact, and a 4-20 mA
standard signal proportional to the pH or to
the T° C, are available as output signals.
The pulse output signals are provided by
relays or transistors.
ALARM
Static process control
A) Static process: Fluid controlled in a
tank, without significant flow, the control
mode is proportional.
Controlling Principle
ACID BASE
ALARM
The pH controller 8205 is designed for use
in static or dynamic process of pH control.
The output signals may control a valve or a
pump, by means of impulses which time
duration or frequency is computed
according to user parameters and pH value
of the fluid.
(See § 4.3 Operation).
Fig. 2.2
Dynamic process control
B) Dynamic process: Fluid controlled in a
pipe, or in a tank with significant flow. The
control mode is PI or PID.
Refer to Appendix A for general
characteristics of PID controllers.
E-4-
2 SPECIFICATION
PH CONTROLLER 8205
2.4 Dimensions of the pH controller 8205
113
91
(190)
21
88
88
85.5
123
180
88
88
116
103
90
DN
(mm)
H (mm)
H
T-fitting
Fig. 2.3
15
20
25
32
40
50
65
80
100
110
125
150
180
200
126
Saddle
186
183
183
187
191
197
197
223
222
226
231
227
234
244
268
280
Dimensions pH controller 8205 compact
E-5-
Plastic
spigot
Stainless steel
welding tab
206
212
219
193
199
205
213
254
261
225
233
282
260
2 SPECIFICATION
PH CONTROLLER 8205
41
88
25
2
95
80
76
50
Fig. 2.4
95
80
76
50
88
76
Dimensions pH controller 8205 panel-mounted version, and drilling jig
126
23
23
24
48
90
120
140
blanking stripe
blanking stripe
25.5
5 cable glands
+ 1 cable gland reducer
Fig. 2.5
Dimensions pH controller 8205 wall-mounted version
E-6-
2 SPECIFICATION
PH CONTROLLER 8205
2.5 Technical data
pH measurement
Measuring range
Resolution
Measuring error
0...14 pH
0,01 pH
± 0,02 pH, after electrode calibration
Temperature measurement
Measuring range
Resolution
Measuring error
Compensation
-30 to +140 °C
0,1 °C
± 1 °C
automatic compensation with the Pt1000, or manual
compensation through user programming
Reference temperature = 25°
Control mode
Programmable, type P; PI ; PID
Min. difference of the pH measuring range corresponding to the 4-20 mA signal
0,5 pH unit (ex: range 6,7 to 7,2 pH corresponds to the 4-20 mA current output)
Electrical data
Power supply
15-30 VDC, filtered and regulated, or 115/230 VAC 50/60 Hz (see technical data 115/230 VAC, next page),
depending on the version
Current consumption, max.
(without sensor)
with relays: ≤ 60 mA at 30 VDC, ≤ 110 mA at 15 VDC
without relays: ≤ 40 mA at 30 VDC, ≤ 70 mA at 15 VDC
Current output
4-20 mA programmable, proportional to pH (or T°C)
Loop resistance:
1200 Ω max. at 30 V; 900 Ω max. at 24 V; 450 Ω max. at 15 V
Alarm relay output
1 relay, normally open, adjustable, 3 A, 230 VAC
Pulse output
2 relay or 2 transistor outputs (depending on version);
programmable pulse duration and frequency
- Relays: 3 A / 250 VAC max. ; F < 1 Hz, normally open
- Transistors: polarized, potential free, 5 - 30 VDC, 100 mA,
protected. Line drop at 100 mA: 1.5 VDC
Electrical connection
through shielded cable with a max. section of 1,5 mm2
E-7-
2 SPECIFICATION
PH CONTROLLER 8205
Materials
Sensor armature
O rings
Pt1000
Housing
Cover with lid
Screws
Cable glands
PVDF
FPM (EPDM supplied with the product)
Stainless steel 1.4571 (316 Ti)
PC (compact and panel-mounted versions)
ABS (wall-mounted version)
PC (compact version)
Stainless steel
PA
Environment
Ambient temperature
Storing temperature
Relative humidity
Protection rating
0 to 60 °C
Compact version: 4 to 30 °C (limited through the
electrode)
Separated versions: 0 to 60 °C
max 80 %, non condensated
IP 65 (compact, wall-mounted and front panel of the
panel-mounted versions)
IP 20 (rear side of the panel-mounted version)
Technical specifications 115/230 VAC
Voltage supplied
Max. current
Integrated protection
Power
27 VDC regulated
250 mA
fuse 250 mA temporised
6 VA
Electrode type UNITRODE (8205 compact)
Armature
Medium pressure
Medium temperature
Max. pressure at max. temperature
Diaphragm
Reference electrolyte
glas
0-6 bar
0-130 °C
4 bar
2 clogging free "single poresTM"
polymer
Technical data pH electrode type 8200 for remote 8205 controllers
See corresponding instruction manual (order code 428937)
E-8-
3 INSTALLATION
PH CONTROLLER 8205
3.1 Installation Guidelines
The electrode must continuously be
immersed into the measured fluid in order
to protect it from drying out.
Calibrate the controller before
installation (see § 4.2).
Before first electrode
calibration, immerse it for 2
hours at least in buffer solution
pH=7 or in a solution of KCl 3M
(223,6 g/l) or in drinkwater.
3.1.1 installation compact 8205
The pH controller can be easily installed in
pipes using our specially designed fitting
system. Before installation, the controller
must be calibrated with buffer solutions
(see § 4.2). Remove protective cap of the
sensor.
Pressure-Temperature-Diagram
Mind pressure-temperature dependence
according to the respective fitting
materials.
P (bar)
1. The fitting 4 must be installed into the
pipe according to the installation
specifications in section 3.1.
2. Insert plastic nut 3 into fitting, and let
plastic ring 2 snap into guide bush 5.
3. Carefully insert the pH controller 1 into
the fitting. If installed properly, the
controller cannot be rotated.
4. Tighten controller housing to fitting with
plastic nut 3.
Application range
10
9
8
PVDF
7
6
PVDF (PN 6)
PVC + PP
5
4
3
PVC (PN 6)
2
1
PP (PN 6)
0
-50
-30
-10
+10
+30
+50
+70
+90
+110
+130
T (°C)
Plastic nut must only be
tightened by hand!
Installation Guidelines
Mount the compact pH controller in vertical
position (max. ±75°) into a horizontal pipe
(cf fig. 3.1).
75°
75°
The device must be protected
from the rain, constant heat
radiation and other
environmental influences such
as magnetic fields or direct
exposure to sunlight.
Fig. 3.1
E-9-
Mounting, compact version
3 INSTALLATION
PH CONTROLLER 8205
3.1.2 pH controller 8205 panel installation
Respect the installation specifications described in the instruction manual of the remote
sensor.
Follow the instructions below to install the transmitter:
1. Use the supplied drilling jig to cut away the necessary opening in the panel. Make sure
to scrupulously respect the dimensions indicated.
2. Place the gasket on the 4 screws of the cover.
Note: Use the 4 M4x25 screws supplied if the panel door is too thick.
3. Place the cover+gasket set on the cut-away with the electronic board facing the inside
of the panel.
4. Insert the 4 washers onto the 4 screws and fit the device to the panel using the 4 nuts.
5. Connect according to instructions described in chapter 3.2.
6. Use the supplied cable clip to fit the cable to the protective plate (see 3.2.2).
Screw
Washer
Nut
Gasket
Cable clip
Fig. 3.2
Mounting pH controller, panel-mounted version
E-10-
3 INSTALLATION
PH CONTROLLER 8205
3.1.3 Installation pH controller 8205 wall-mounted version
The pH controller in wall-mounted version has 4 fixing holes in the bottom enclosure.
Remove the white blanking stripes (see Fig. 2.5) and the cover to access to fixing holes 1.
Fuse
1
Switch for power supply
selection 115/230 VAC
1
CURRENT
SOURCE SINK
3
PE
Supply
12..30Vdc
T
PT1000
4 Fluid potential
5 PE
PE
(third electrode)
+
TRANS1:
REL1
REL:230VAC/3A
TRANS:5..30VDC/100mA
250 mA
Iout L+ L-
2
L N
REL2
TRANS2:
REL ALARM
+
5 6 7 8 9 10
1
Fig. 3.3
230V
1
PE
1
Mounting pH controller, wall-mounted version
3.2 Electrical connection
3.2.1 Electrical connection recommendations (all versions)
●
●
●
●
Do not open and wire the device with the power supply connected.
The electrical installation of the building where the controller is
installed must be secured by a switch or a circuit breaker.
It should be installed near the controller, be easily accessible and be
clearly identified as the switchgear of the controller.
It is recommended to put security devices on :
Power supply: Fuse (300 mA - temporised) and an interrupter
Relay: 3A max. fuse and circuit breaker (depending on application).
Do not apply in the same cable both a dangerous voltage and a very
low safety voltage to the relays.
E-11-
3 INSTALLATION
PH CONTROLLER 8205
●
Use shielded cables with a temperature limit of 80°C minimum.
●
For normal operating conditions the measuring signal can be transmitted by a
shielded cable of 0.75 mm2 cross section.
●
The line must not be installed in combination with carrying lines with a higher
voltage or frequency.
●
If a combined installation cannot be avoided, a minimum space of 30 cm should be
respected.
●
The cable diameter must be between 6 and 12 mm;
If 2 cables are needed, use the supplied multiway seal and 4-mm diameter cables.
●
The 15-30 VDC power supply must be filtered and regulated.
●
Ensure the equipotentiality of the installation (power supply - controller - medium):
- The various earth spots in the installation have to be connected together to
eliminate the potential differences that may occur between different earthes.
- Observe faultless grounding of the cable shielding.
- Earth the negative terminal of the power supply to suppress the common mode
currents. If direct earthing is not possible insert a 100 nF / 50 V-capacitor
between the negative terminal and the earth.
Special attention has to be paid if the device is installed on plastic pipes because
there is no direct earthing possible.
Proper earthing is performed by earthing together the metallic devices such as pumps
or valves, that are as close as possible to the controller.
Equipotentiality skeleton diagrams, compact versions
Power supply
15-30VDC
+
(*)
Metallic pipes
Connection to be carried out on the
terminal strip of the electronic board
(*)
If direct earthing is impossible, connect a 100 nF/50V-condensator between the negative terminal and the
earth.
E-12-
3 INSTALLATION
PH CONTROLLER 8205
Power supply
15-30VDC
+
-
Metallic devices
(valve, pump,...)
(*)
Plastic pipes
Connection to be carried out on the
terminal strip of the electronic board
Equipotentiality skeleton diagrams, separate versions
8205
+
-
Power supply
Wall or
panel
mounted
(*)
Connection to be carried out on the
terminal strip of the electronic board
8200
Power supply
+
-
(*)
8205
Wall or
panel
mounted
Connection to be carried out on the
terminal strip of the electronic board
8200
Metallic devices
(valve, pump,...)
(*)
If direct earthing is impossible, connect a 100 nF/50V-condensator between the negative terminal and the
earth.
E-13-
3 INSTALLATION
PH CONTROLLER 8205
3.2.2 Using the cable clip
Before wiring the device, insert the supplied
cable clip into the cut of the electronic
board and, if fitted, into the cut of the
115/230 VAC power supply board.
Fig. 3.3
Using the cable clip
3.2.3 Electrical connection, compact version, 15-30 VDC
Before wiring the device, please read § 3.2.1.
Lift the transparent lid after having unfastened the screw. Remove the cover of the device
by unscrewing the 4 screws, pass the cables through the cable glands and connect
according to the pin assignment below.
Always seal the unused cable gland using the supplied obstructor to
ensure the tightness of the device.
Unscrew the cable gland nut, insert the obstructor and screw the nut
back onto the cable gland.
L+ (15-30 VDC)
4-20mA
L- (0 V)
Connect the shielding of the power supply
cable
CURRENT
Switch 1: see
Fig. 3.5
SOURCE SINK
1
PE
Supply
12..30Vdc
T
PT1000
4 Fluid potential
REL:230VAC/3A
TRANS:5..30VDC/100mA
REL1
5 PE
Connection of the pH
sensor
+
Relay or transistor
cables must be fitted
here to the board
using the supplied
cable clip (see § 3.2.2)
REL ALARM
+
Connection of the alarm relay
Fig. 3.4
PE
(third electrode)
{
{
3
TRANS1:
Connection of the 2
relays or the 2
transistors:
see Fig. 3.6 and 3.7
Iout L+ L-
2
PE
REL2
TRANS2:
Connect the shielding
of the transistor output
cable
Electrical connection, 8205 compact
E-14-
Connection of the
temperature sensor
3 INSTALLATION
PH CONTROLLER 8205
Only manipulate the switch when the device
is not powered.
CURRENT
SOURCE SINK
1
Iout L+
S
12
2
PE
3
T
PT1000
4 Fluid potentia
REL:230VAC/3A
5..30VDC/100mA
(third ele
Using switch 1
Transistor 2 (+)
+
REL ALARM
Transistor 2 (-)
Version with 2 relays
Fig. 3.6
+
Transistor 1 (-)
+
REL ALARM
Transistor 1 (+)
TRANS1:
+
REL1
REL:230VAC/3A
TRANS:5..30VDC/100mA
TRANS1:
{
Connection of relay 2, {
normally open (Acid)
REL2
TRANS2:
Connection of relay 1,
normally open (Base)
REL1
REL:230VAC/3A
TRANS:5..30VDC/100mA
REL2
TRANS2:
Fig. 3.5
5 PE
Switch 1:
- Set to "SOURCE" position if 4-20 mA output is connected to a
PLC in sourcing mode
- Set to "SINK" position if 4-20 mA output is connected to a PLC
in sinking mode
Version with 2 transistors
Pin assignment of the relays or the transistors
E-15-
3 INSTALLATION
PH CONTROLLER 8205
Connecting the transistor outputs to a PLC
The transistor outputs of pH controller 8205 can be connected to a PLC, either in NPN or
PNP mode.
-
+
REL1
Connection to a PLC, NPN mode
REL ALARM
REL2
TRANS2:
+
REL ALARM
REL2
TRANS2:
+
TRANS1:
+
+
Fig. 3.7
-
REL:230VAC/3A
TRANS:5..30VDC/100mA
TRANS1:
REL1
REL:230VAC/3A
TRANS:5..30VDC/100mA
+
-
+ 5-30 VDC
-
PLC
+
-
+
+ 5-30 VDC
-
PLC
Connection to a PLC, PNP mode
Connecting the transistor outputs to a PLC
E-16-
PH CONTROLLER 8205
3 INSTALLATION
Connecting the 4-20 mA current output to a PLC
The 4-20 mA output of the pH controller 8205 can be connected to a PLC. Depending on
the PLC type, position the "source/sink" switch 1 properly (see Fig. 3.5).
+
+
-
-
4-20 mA
300 mA
+
Switch 1:
see Fig. 3.5
I
(*)
1
Iout L+ L-
3
T
SOURCE SINK
PE
(third electrode)
+
1
PE
3
PT1000
REL1
PE
(third electrode)
+
TRANS1:
REL ALARM
5 PE
PE
Supply
12..30Vdc
T
4 Fluid potential
REL:230VAC/3A
TRANS:5..30VDC/100mA
+
REL2
TRANS2:
Iout L+ L-
2
TRANS1:
REL1
5 PE
(*)
CURRENT
PT1000
4 Fluid potential
REL:230VAC/3A
TRANS:5..30VDC/100mA
I
PE
Supply
12..30Vdc
2
+
-
Switch 1:
see Fig. 3.5
CURRENT
SOURCE SINK
PE
-
Connection in sourcing mode and
connection example for the alarm relay
Fig. 3.8
REL ALARM
REL2
TRANS2:
+
+
-
Connection in sinking mode
Connecting the 4-20 mA current output to a PLC
E-17-
15-30 VDC
300 mA
4-20 mA
15-30 VDC
Only manipulate the switch when the device is not powered.
PH CONTROLLER 8205
3 INSTALLATION
3.2.4 Electrical connection, panel-mounted version
Before wiring the device, please read § 3.2.1.
Install the transmitter as described in § 3.1.2. Connect the terminals according to the pin
assignment described in fig. 3.6, 3.7, 3.8 and 3.9.
L+ (15-30 VDC)
4-20mA
Switch 1: see
Fig. 3.5
L- (0 V)
Connect the shielding of the power supply cable
CURRENT
SOURCE SINK
1
PE
PE
Supply
12..30Vdc
T
PT1000
4 Fluid potential
5 PE
PE
(third electrode)
+
TRANS1:
REL1
REL:230VAC/3A
TRANS:5..30VDC/100mA
{
Connection of
the alarm relay
3
Connection of the pH
sensor
Relay or transistor
cables must be fitted
here to the board using
the supplied cable clip
(see § 3.2.2)
REL ALARM
+
REL2
TRANS2:
Connection of the 2
relays or the 2
transistors:
see Fig. 3.6 and 3.7
Iout L+ L-
2
Connect the shielding
of the transistor output
cable
{
Connection of the
temperature sensor:
1: red wire
2: blue wire
3: white wire
4: green/yellow wire
5: shielding of the cable
1
2
3
4
5
Pt1000
Fluid equipotential
Fig. 3.9
Electrical connection, panel-mounted version
Connection to a PLC
The transistor outputs of the pH controller 8205 can be connected to a PLC, either in
NPN or PNP mode. See Fig. 3.7.
The 4-20 mA current output of the pH controller 8205 can be connected to a PLC.
See Fig. 3.8.
E-18-
PH CONTROLLER 8205
3 INSTALLATION
3.2.5 Allocation of the cable glands of the wall-mounted versions
When connecting a wall-mounted version, pass the cables through the cable glands by
preferably respecting the following allocation in order to ease the wiring:
Transistor and relay cable
pH and Pt cable
Current output cable
15-30 VDC or 115/230 VAC
supply cable
3.2.6 Electrical connection, wall-mounted version, 15-30 VDC
Before wiring the device, please read § 3.2.1.
Unscrew the 4 screws of the cover and unscrew the cable glands. Pass the cables
through the cable glands by preferably respecting the allocation indicated in § 3.2.5.
Connect the terminals as the panel-mounted version according to § 3.2.4.
Connect the pH sensor to the electronic board (see § 3.2.4) after having inserted the
reducer into the cable gland, if need be, and passed the pH sensor cable through the
reducer.
E-19-
3 INSTALLATION
PH CONTROLLER 8205
3.2.7 Electrical connection, wall-mounted version, 115-230 VAC
Before wiring the device, please read § 3.2.1.
Unscrew the 4 screws of the cover and unscrew the cable glands. Pass the cables
through the cable glands by preferably respecting the allocation indicated in § 3.2.5.
Connect the terminals according to the pin assignments of Fig. 3.6, 3.7, 3.8 and 3.10.
Connect the pH sensor to the electronic board (see § 3.2.4) after having inserted the
reducer into the cable gland, if need be, and passed the pH sensor cable through the
reducer.
Only manipulate the power supply switch when the device is not
powered.
Loop through
shield*
Black wire* LRed wire* L+
Green wire*
4-20 mA
Switch 1:
see Fig. 3.5
Connection of the
temperature sensor:
see Fig. 3.9
115 VAC or 230 VAC
selection switch
CURRENT
SOURCE SINK
PE
Supply
12..30Vdc
PT1000
T
PE
4 Fluid potential
5 PE
(third electrode)
+
TRANS1:
L N
{
REL1
REL:230VAC/3A
TRANS:5..30VDC/100mA
T 250 mA
3
+
REL2
TRANS2:
7 8 9 10
REL ALARM
5 6
Connection
of the pH
sensor
All the
cables
must be
fitted here
Iout
L+
-
4-20 mA
Connection of current output
to a PLC in sinking mode
Fig. 3.10
Iout
L-
Connect the shielding
of the output cable
+
+
Iout
* Factory
prewired
-
4-20 mA
Connection of current output to a
PLC in sourcing mode
Electrical connection, wall-mounted version, 115-230 VAC
E-20-
Connection of the
115/230 VAC
power supply
Connection of
the alarm relay
Not assigned
Relay or
transistor cables
must be fitted
here to the board
using the
supplied cable
clip (see § 3.2.2)
{
{
{
Iout L+ L-
2
PE
230V
1
Connect the shielding
of the transistor output
cable
Connection of the 2
relays or the 2
transistors:
see Fig. 3.6 and 3.7
Fuse
4 OPERATION
PH CONTROLLER 8205
The operation of the pH controller is classified according to 3 levels.
Main Menu
pH, temperature, output current, setpoint and working rates are displayed in the normal
function mode.
The "HOLD" function and electrode calibration function ("PH CALIB") can be accessed in
this menu. (see § 4.2)
Calibration Menu
The calibration mode allows adjustments of language, units, 4...20 mA output, output
frequencies and impulse durations, pH setpoint adjustment, regulation principle (P; PI;
PID), alarm thresholds, manual display selection, temperature compensation mode, and
filter selection. (see § 4.3).
Test Menu
The test menu allows the basic setting of the controller (Offset, Span, temperature
adjustment).
A pH or temperature value can be simulated via this menu, allowing the process to be
tested in the "dry condition".
The display of the instantaneous electrode voltage is available. (see § 4.4)
4.1 Controller Operating and Control Elements
Parameter selection and
digit incrementation
Validation of
parameters and
menu options
Led indicating the relay
2 or transistor 2 status
Alarm relay
(normally closed)
Selection of parameter and
character
E-21-
Led indicating the relay
1 or transistor 1 status
4 OPERATION
PH CONTROLLER 8205
4.2 Operation Mode Display
The following process values are displayed in the display operation mode.
PH = 12.60
20.6 °C
0......9
10.32 mA
HOLD
PH CALIB
pH with two decimals. Press
rates control function.
ENTER
to display the working
Temperature in °C or °F.
Output signal 4...20 mA, proportional to the pH or temperature
value.
HOLD-function. (quick blincking)
Calibration of the pH electrode signal.
4.2.1 Working rates control function
Allow the current working rates to be checked for output 1 (Base) and output 2 (Acid).
If the HAND option is enabled (see § 4.3.9) , the change of percentage rates is allowed in
this sub-menu, by pressing simultaneously the keys
and
for 2 sec.
0......9
To deactivate the HAND option, press the two keys again for 2 sec.
S1 =6.5
PH = 12.60
PH = 12.60
ENTER
S2=7.5
ENTER
57 % 1
ENTER
+
0......9
2s
0......9
000 % 1
Base
000 % 2
Acid
(only available if HAND option enabled)
Reactive selection
000 % 1
0......9
PH = 12.60
100 % 1
ENTER
E-22-
Output percentage
adjustment
4 OPERATION
PH CONTROLLER 8205
4.2.2 HOLD function
A continuous 4-20 mA output corresponding to the last value measured before this
option was entered is generated. The alarm relay is blocked in its last state. This allows
the electrode to be cleaned without interruption of the process. The display in the
operation mode is flashing and there is no access to the parameter definition or the test
menu, as long as the HOLD-function is activated. To disactivate HOLD function, enter
again "HOLD" option and confirm "HOLD NO".
HOLD
ENTER
Press Enter for
5 seconds
PH CALIB
HOLD YES
HOLD NO
ENTER
4.2.3 Calibration of pH electrode
1 or 2 measuring points calibration methods are available.
1 measuring point method: enables a quick control calibration with pH=7 buffer solution.
2 measuring points method: enables a precise calibration of zero and slope of the pH
electrode. 2 buffer solutions are required. The first solution is usually pH=7. Use the
second buffer solution as close as possible of the assumed final pH value. Before each
calibration, clean the electrode (see §5.2). The temperatures of the buffer solutions must
be equal. The pH controller must be calibrated regularly.
This maintenance procedure is very important to ensure a reliable control operation.
The frequency of calibrations depends upon the degree of contamination of the measuring
fluid: in normal conditions, calibration should be repeated once a week.
E-23-
4 OPERATION
PH CALIB
ENTER
PH CONTROLLER 8205
1 POINT
PH = 7.00
ENTER
Press Enter fo 5 sec.
Immerse electrode in buffer
solution and confirm
ENTER
CALIB . . .
Automatic confirmation (approx.
20 s.) or press ENTER
ENTER
PH = 9.25
ENTER
2 POINTS
OFF= -5.1
BUFFER 1
ENTER
Automatic confirmation
(approx. 20 s.) or press
ENTER
RINSE
ENTER
PH=00.00
Enter buffer value
CALIB . . .
ENTER
0......9
PH=07.05
Immerse electrode in buffer
solution and confirm
ENTER
BUFFER 2
ENTER
PH=00.00
ENTER
Enter buffer value
0......9
CALIB . . .
Automatic confirmation
(approx. 20 s.) or press ENTER
ENTER
OFF= -18.6
ENTER
PH = 9.25
ENTER
SP= 57.53
To escape electrode calibration, press
Previous calibration values are kept.
ENTER
PH=04.00
Immerse electrode in buffer
solution and confirm
The message "WARNING" at the end of calibration indicates a
buffer solution error or advanced ageing of the electrode. In
this case, a change of electrode must be foreseen.
The message "ERROR" at the end of calibration indicates a
buffer solution error or that the electrode is out of tolerances.
In this case, values of previous calibration are kept. The
electrode must be changed, otherwise the measured values
would be erroneous.
0......9
+
E-24-
simultaneously for 2s.
4 OPERATION
PH CONTROLLER 8205
4.3 Calibration Mode: Press
ENTER
simultaneously for 5 seconds
The following adjustments are set in the calibration mode display:
LANGUAGE
T° UNIT
English, German, French, Italian or Spanish.
Temperature unit selection (°C; °F).
CURRENT
Adjustment of the 4...20 mA measuring range (pH or T°).
OUTPUT 1
Selection of output signal 1 (impulse duration or frequency).
OUTPUT 2
Selection of output signal 2 (impulse duration or frequency).
SETPOINT
0......9
CONTROLL
ALARM
HAND
Adjustment of 2 setpoint for pH control (high/low or high/ very
high;...).
Selection of the pH control mode (P; PI; PID).
Adjustment of 2 alarm thresholds for pH or temperature (high/
low or high/ very high;...).
Manual operation selection.
T° SENSOR Selection of the temperature entry Pt1000 or Manual (without
Pt1000). Entry of the simulation value.
FILTER
END
Back to the operation mode and storage of new parameters.
ENGLISH
4.3.1 Language
LANGUAGE
Damping selection. 10 different steps available.
ENTER
DEUTSCH
FRANCAIS
ITALIANO
T° UNIT
ENTER
SPANOL
E-25-
The selected language is confirmed
by the ENTER key and becomes
immediately active.
4 OPERATION
PH CONTROLLER 8205
4.3.2 Temperature units
The temperature can be displayed in °Celsius or in °Fahrenheit.
T° UNIT
ENTER
°CELSIUS
°FAHRENH
CURRENT
ENTER
4.3.3 Output Current
Enter the measuring range corresponding to the 4...20 mA output. First select the unit pH
or T°current then, enter the limit values . E.g. 2 to 12 pH associated to 4...20 mA. The
beginning of the measuring range might be larger than the end of it, e.g. 2 to 12 pH
corresponds to 20...4 mA (inverted output signal).
CURRENT
ENTER
mA...PH
mA...°C
ENTER
Enter the
beginning
of the
measuring
range
End of the
measuring
range
4=00.00
0......9
4=02.00
ENTER
20=00.00
0......9
RELAY
ENTER
20=12.00
If the beginning of the measuring range equals the end of it, there will be
no display of the current value in the operation mode display (§4.2)
E-26-
4 OPERATION
PH CONTROLLER 8205
4.3.4 Output 1 (Base)
Select the controller output 1 logic signal.
Impulse time selection (PULSE 1)
Set the duration of each impulse and the maximum frequency of the output signal.
Impulse frequency selection (PWM1)
Set the frequency of the logic output signal activation.
OUTPUT 1
ENTER
PWM 1
ENTER
T1=000,0S
Impulse
Duration
(T1)
0......9
OUTPUT 2
ENTER
T1=012,3S
0......9
PULSE 1
ENTER
T1=000,0S
Impulse
Duration
(T1)
0......9
T1=001,5S
ENTER
000 / MIN
Impulse
Frequency
(F1)
0......9
OUTPUT 2
ENTER
012 / MIN
(T1 (s)+0,02 (s)) x F1 < 60
Internal checking of this condition
is provided. If this is not, the
program returns to T1 selection
until complying with the required
condition.
If the pulse output is provided by a relay; set F1 < 60. (cf § 2.5)
E-27-
4 OPERATION
PH CONTROLLER 8205
4.3.5 Output 2 (Acid)
Select the controller output 2 logic signal.
Impulse time selection (PULSE 2)
Set the duration of each impulse and the maximum frequency of the output signal.
Impulse frequency selection (PWM2)
Set the frequency of the logic output signal activation.
OUTPUT 2
ENTER
PWM 2
ENTER
T2=000,0S
Impulse
Duration
(T2 s)
0......9
SETPOINT
ENTER
T2=012,3S
0......9
PULSE 2
ENTER
T2=000,0S
Impulse
Duration
(T2 s)
0......9
T2=001,5S
ENTER
000 / MIN
Impulse
Frequency
(F2)
0......9
SETPOINT
ENTER
012 / MIN
(T2( s)+ 0,02(s)) x F2 < 60
Internal checking of this condition
is provided. If this is not, the
program returns to T2 selection
until complying with the required
condition.
If the pulse output is provided by a relay; set F2 < 60. (cf § 2.5)
E-28-
4 OPERATION
PH CONTROLLER 8205
4.3.6 Setpoint Adjustment
Select the pH curve setpoints.
L1<L2 and S1<=S2 (1)
Limit 1 (L1) Set the low bow of the pH
curve.
Setpoint 1 (S1)
Set low limit of the pH regulation curve
Setpoint 2 (S2)
Set the high limit of the pH regulation curve.
Limit 2 (L2)
Set the high bow of the pH curve
SETPOINT
ENTER
L1 =03.00
0......9
L1 =03.50
S1 =06.00
ENTER
0......9
S2=07.00
ENTER
S1 =06.50
0......9
S2=07.50
pH
L2
ENTER
S2
L2=11.00
0......9
CONTROLL
ENTER
S1
L1
L2=10.50
Vo lume
REACTIVE
If the condition (1) is not fulfilled, the menu points on L1=3.00. New
values have to be selected, before leaving the menu.
E-29-
4 OPERATION
PH CONTROLLER 8205
4.3.7 Control Mode
Selection of Control Mode (static or dynamic) and corresponding calculation parameters
for P; PI; or PID functions (Pleas refr to appendix A1).
BASE
CONTROLL
ENTER
STATIC
CONTRL1
ENTER
ACID
CONTRL2
*
KP1 = 1.00
0......9
0......9
ENTER
CONTROLL
KP1=27.00
Proportional factor
BASE
DYNAMIC
CONTRL1
ENTER
ACID
CONTRL2
KP1 = 1.00
*
0......9
TN1 = 1.0
*
KP1 =7.00
ENTER
Proportional factor
0......9
TN1 = 2.0
Integral factor
ENTER
TV1 = 1.1
*
Derivative factor
If TV1=0.0, then control mode is PI.
0......9
CONTROLL
ENTER
TV1 = 1.1
E-30-
* Respectively KP2; TN2; TV2
if CONTRL2 selected.
4 OPERATION
PH CONTROLLER 8205
4.3.8 Alarm Threshold Selection
2 thresholds are set for the relay Alarm: MIN and MAX. Options to invert the relays and set
a delay between 0 and 999 seconds are available. The delay prevents the relay from too
fast activation, e.g. when time for homogenization is required (measurements in tanks with
agitator). If the pH (or T°) exceeds a threshold, the controller awaits the delay before
activating the relay. No alarm will be provided, if the measured pH (or T°) returns to a
normal value before the delay is elapsed.
The following condition must be maintained MIN ≤ MAX; and ∆ pH> 0,2
(or ∆ T° > 2°C) .
ALARM
ENTER
MIN=00.00
ENTER
PH ALARM
° C ALARM
0......9
MAX=00.00
MIN=01.50
ENTER
0......9
MAX=06.50
DEL.1=000
ENTER
0......9
DEL.1=030
ENTER
INV NO
MANUAL
INV YES
ENTER
closed
open
min
∆ pH > 0,2
∆ T° > 2 °C
pH
OPEN
T° (°C/°F)
max
pH / T°
MAX
MIN
Delay
Delay
Delay
1
T(s)
0
E-31-
4 OPERATION
PH CONTROLLER 8205
4.3.9 Hand Display Selection
Select the Hand display mode to allow the manual entry of percentages values of base
and acid outputs.
HAND
ENTER
NO
YES
SENSOR T°
ENTER
4.3.10 Temperature Compensation Mode
If the Pt1000 is not used for temperature acquisition, select SENSOR NO and enter the
temperature of the fluid.
SENSOR T°
ENTER
NO
YES
ENTER
+ 023
0......9
+ 045
FILTER
ENTER
FILTER
E-32-
4 OPERATION
PH CONTROLLER 8205
4.3.11 Filter Function
The damping is set in this sub-menu, which prevents display and output current
fluctuations. There are 10 steps available. However, the first step ("FILTER 0") has no
damping function.
FILTER
FILTER 0
ENTER
0......9
FILTER 9
VOLTAGE
ENTER
4.4 Test Menu: Press
ENTER
0......9
simultaneously for 5 seconds
The following compensations and controls are carried through in the Test menu:
OFFSET
SPAN
0......9
T° ADJUST
SIMUL
VOLTAGE
END
Zero point compensation (4 mA).
Span compensation (20 mA).
Temperature value correction. The outputs are reacting
according to this input.
pH or temperature value to be simulated. The outputs are
reacting according to this input.
Electrode voltage display.
Return to the operation mode and storage of new parameters
for OFFSET and SPAN and T° adjustment. If one of the
values is erroneous, the device points on "OFFSET", and new
values must be entered.
E-33-
PH CONTROLLER 8205
4 OPERATION
4.4.1 Offset-Compensation
In order to check and modify the basic setting of 4 mA, connect an ammeter in the output
circuit. Press ENTER when "OFFSET" is displayed, the controller generates 4 mA. If the
measured value is different from 4 mA, enter the measured value as offset value.
OFFSET
ENTER
OF= 04.00
0......9
SPAN
ENTER
OF= 04.02
Enter the measured value
4.4.2 Span-Compensation
Check and modify the basic setting of 20 mA. The procedure is identical to the Offsetcompensation. The controller generates 20 mA, if the ENTER key is pressed when
"OFFSET" is displayed. Correct the span value by entering the measured value if
necessary.
SPAN
ENTER
SP= 20.00
0......9
T ° ADJUST
ENTER
SP= 19.96
Enter the measured value
4.4.3 Temperature adjustment
The temperature value issued from the Pt1000 can be corrected. Enter the required
offset of temperature (within the limit +/- 5°C), then valid. The temperature unit is as
selected in previous parameter menu. The selected temperature value influences the
computed pH value.
T ° ADJUST
ENTER
+ 0.0 ° C
0......9
SIMUL
ENTER
Enter the temperature
offset value (°C or °F)
+ 1.2 ° C
The temperature adjustment remains active until another value is entered.
The temperature adjustment is not valid with manual temperature compensation mode.
E-34-
4 OPERATION
PH CONTROLLER 8205
4.4.4 pH Simulation
A pH (or T°) value can be simulated in this menu, allowing the user to test his system
without any liquid. The simulated value influences the current and pulse outputs and the
alarm relay.
SIMUL
ENTER
PH SIMUL
ENTER
PH=00.00
Enter the pH value
SIMUL
0......9
1)
ENTER
0......9
T ° SIMUL
ENTER
PH=10.50
00.0 ° C
Enter the temperature value
0......9
1)
SIMUL
ENTER
1)
Quit the sub-menu SIMUL by pressing
until the user enters another sub-menu.
0......9
or
. The simulation remains active
4.4.5 Display of electrode voltage
Display of the instantaneous value of the electrode voltage.
VOLTAGE
END
ENTER
-456 m V
ENTER
E-35-
021 ° C
5 MAINTENANCE
PH CONTROLLER 8205
5.1 Replacement of the pH electrode (compact controller only)
pH-electrodes have a limited service life, depending upon many
parameters, such as the chemical composition of the handled fluid,
temperature, pressure, etc.
The manufacturer warranty for the 8205 does not cover the pH electrode.
The electrode must be replaced if it shows visible damage (broken glass, fractures, etc.)
or if the message "ERROR" is displayed at the end of calibration.
For replacement, proceed as follows:
1. Disconnect supply voltage and make sure that there is no pressure on
pipe or tank.
2. Remove the controller from the pipe or submersion assembly.
3. Lift the transparent lid after having unfastened the screw. Unscrew the cover and open
it slightly.
4. Pull out pH and temperature cables from the electronic board.
5. Pull sensor assembly out of the enclosure.
6. Screw electrode out of assembly with SW17 wrench.
7. Screw new electrode into assembly and tighten with SW17 wrench. Reassemble in
reverse order.
5.2 Storing and Cleaning of the Electrode
When not in operation, the electrode should be stored in a 3 molar potassium chloride
solution (223,6 g/l), providing a regenerative effect. Is there no such solution available,
normal tap water will also do for short measuring interruptions of max. 2 - 3 days. The
electrode must not be stored in distilled or deionisized water, which may be used for
rinsing purposes only!
Experience has shown, that the majority of failures in pH electrode measurements and
long response times originate from contaminated electrodes or diaphragms. Since the
contamination is subject to the application, there is no general detergent available yet. The
following detergents, however, can be recommended for most application cases:
-Greasy or oily deposits must be removed with a tenside-containing agent.
-Chalky deposits and metal hydroxide layers require diluted hydrochloric acid (10%).
-Sulphide-containing deposits (purification systems) are removed with a detergent mixture
of diluted hydrochloric acid (10%) and saturated pepsin.
-For very slow pH-electrodes dip the electrode for 1 minute into a 2% HF and 5% HCL
solution and rinse thoroughly.
E-36-
5 MAINTENANCE
PH CONTROLLER 8205
Observe safety regulations, when handling acid-containing solutions.
Always rinse electrode with deionisized water and leave for approx. 10
minutes in a 3 molar potassium chloride solution or in tap water.
5.3 Error messages
"ERROR" on the display (except in electrode calibration function) indicates that calibration
data are lost. By pressing ENTER, the user access to operation menu but the device
works with the factory settings (see §5.4). The controller needs re-calibration. If this
message recurs, please return the controller to your supplier.
Temperature: If "----° C" or "----° F" is displayed, temperature is out of range (-40...+150)
or connection with Pt 1000 is interrupted. In this case "PH = --" is displayed. For the
outputs (current and relays) pH=0 is fixed.
pH values out of range: pH>14 or pH<0, "PH = --" is displayed. For the outputs (current
and relays) pH=14, respectively pH=0, are fixed.
Electrode voltage: >+575 mV ou <-575 mV. "PH = --" and "---- mV" are displayed. For the
outputs (current and relays) pH=0, respectively pH=14, are fixed.
Power failure: In case of power failure, the display turns off, 4-20 mA and pulse output to
0, alarm relays open. When the power supply is turned on, the controller is set to the
previous configuration and the measure goes on.
5.4 Factory-setting of pH controller 8205 at delivery
Language:
English
Temperature Unit:
°C
4-20 mA Output:
pH
4 mA:
00.00
20 mA:
00.00
Output1:
Type Pulse
Time 1:
0
Freq 1:
0
Period 1: 0 (PWM1)
Output2:
Type Pulse
Time 2
0
Freq 2:
0
Period 2: 0 (PWM2)
Setpoint:
Limit1:
Set1:
Set2:
Limit2:
Controller:
Proportional
Integer
Derivative
Type : PID
KP1: 1.0
TN1: 1.0
TV1: 1.1
Alarm:
Type pH
MIN:
MAX:
DEL1:
INV:
MANUAL:
Pt1000:
Filter:
3.00
6.00
8.00
11.00
E-37-
Yes
Yes
Filter 2
KP2:
TN2:
TV2:
00.00
00.00
000
No
1.0
1.
1.1
5 MAINTENANCE
PH CONTROLLER 8205
5.5 Spare Parts List pH controller 8205
5.5.1 Spare Parts pH controller 8205 compact
Position
1
Désignation
Référence de commande
Lift-up cover with window, screws, folio
and electronic board with relays
Lift-up cover with window, screws, folio
and electronic board with transistors
426492
Complete housing for 2 x M20x1.5 cable plugs,
with ring and union nut
425526
3+5+6+8 Set incl. 2 cable glands M20x1,5 + 2 neoprene flat gaskets
for cable gland or screwed plug + 2 screwed plugs
M20x1,5 + 2 multiway seals 2x6 mm
449755
2
4+5+6
426490
Set incl. 2 reductions M20x1,5 / NPT1/2'' (mounted gasket)
+ 2 neoprene flat gaskets for screwed plug
+ 2 screwed plugs M20x1,5
551782
Set incl. 1 obturator for cable gland M20x1,5 + 1 multiway
seal 2x6 mm for cable gland + 1 black EPDM gasket
for the sensor + 1 mounting instruction sheet
551775
9
10
11
Ring
Nut
pH electrode, 0...130 °C, 0...6 bar (UNITRODE)
619205
619204
552041
12
Electrode holder with stainless steel Pt1000
Electrode holder with Ti Pt1000
418889
418890
13
Set incl. 1 green FPM gasket + 1 black EPDM gasket
(for the sensor)
552111
Buffer solution pH= 4, 500 ml
Buffer solution pH= 7, 500 ml
Buffer solution pH= 10, 500 ml
Storage solution for electrodes (KCl 3M), 250 ml
418540
418541
418543
418557
Factory 2-point pH calibration certificate
Set with 8 "pH" folios
550673
553198
7+8+13
E-38-
5 MAINTENANCE
PH CONTROLLER 8205
1
3
4
5
2
7
6
9
10
13
12
11
Fig. 5.1
Spare parts, controller 8205, compact
E-39-
8
PH CONTROLLER 8205
5 MAINTENANCE
5.5.2 Spare parts pH controller 8205, panel-mounted
See figure opposite.
Position Designation
1, 2
Order code
Lift-up cover with window, screws, folio
and electronic board with relays
Lift-up cover with window, screws, folio
and electronic board with transistors
426492
3
Gasket
419350
4
Protection plate
427100
5
Mounting kit (screws, lockwashers, nuts, cable clips)
418388
Buffer solution pH= 4, 500 ml
Buffer solution pH= 7, 500 ml
Buffer solution pH= 10, 500 ml
Storage solution for electrodes (KCl 3M), 250 ml
418540
418541
418543
418557
Factory 2-point pH calibration certificate
Set with 8 "pH" folios
550673
553198
2
2
2
426490
3
1
2
Fig. 5.2
Spare parts, controller 8205, panel-mounted version
E-40-
PH CONTROLLER 8205
5 MAINTENANCE
5.5.3 Spare parts pH controller 8205, panel-mounted
Position Designation
Order code
1
Complete IP65 enclosure
557180
2
115/230 VAC power supply board
(*)
3
Electronic board, 8205 wall-mounted, with relays or transistors
(*)
Buffer solution pH= 4, 500 ml
Buffer solution pH= 7, 500 ml
Buffer solution pH= 10, 500 ml
Storage solution for electrodes (KCl 3M), 250 ml
418540
418541
418543
418557
Factory 2-point pH calibration certificate
550673
(*) For non referenced parts, please contact your Bürkert sales office.
Fig. 5.3
Spare parts, controller 8205, wall-mounted version
E-41-
PH CONTROLLER 8205
APPENDIX
A1: Characteristics of PID controllers
A PID controller has a proportional, an integral and a differential component (P, I and D components).
P component :
Function :
Y = Kp • Xd
Kp is the proportional action coefficient. It results from the ratio of the manipulating range ∆Y to
the proportional range ∆Xd.
X
Ymax
Xd
Y
Y
range
t
Y0
Y
Kp.Xd
Ymin
Proportional range
Xd
Xd
t
Characteristic
Step response
Characteristics :
Theoretically, a pure P controller operates without delay, i. e. it is fast and therefore dinamically
favorable. It has a lasting system deviation, i. e. it does not balance out the effects of disturbances
completely and is therefore relatively unfavorable from the static point of view.
I component :
Function :
Y=
ƒ Xd dt
Ti ist the integration or manipulating time. This is the time that elapses before the manipulated
variable has passed through the complete manipulating range.
E-42-
APPENDIX
PH CONTROLLER 8205
X
Xd
dY
dt
t
Y
Ymax
Xd
range ∆Y
Ymin
Control range
Ti
Xd
t
Manipulating
time
Characteristic
Step response
Characteristics :
A pure I controller eliminates the effects of occuring disturbances completely. Therefore, it has
a favorable static response. Owing to its finite manipulating speed, it operates more slowly than
the P controller and tends to oscillate. Therefore, it is relatively unfavorable from the dynamic point
of view.
D component :
Function :
Y= Kd
Kd ist the derivative action coefficient.
The higher Kd is, the stronger the D influence is.
X
Xd
t
Y
t
Step response
Characteristics :
A controller with a D component reacts to changes in the controlled variable and is accordingly
capable of dissipating occurring deviations faster.
E-43-
APPENDIX
PH CONTROLLER 8205
Supperposition of P-, I- and D components:
Y = Kp Xd +
Where Kp•Ti = Tn and
1 ƒ Xd dt + Kd d Xd
Ti
dt
Kd
= Tv, results with regard to functioning of the PID controller:
Kp
Y = Kp (Xd + 1 ƒ Xd dt + Tv d Xd )
dt
Tn
Kp :
Tn :
Tv :
Proportional action coefficient / gain
Reset time (the time needed to achieve the same manipulated variable change by the I
component as is produced as the result of the P component).
Derivative action time (the time to achieve a specific manipulated variable on the basis of
the D component earlier than when using a pure P controller).
X
Xd
t
Y
D component
}
I component
}
P component
Tn
t
Reset time
Step response of the PID controller
E-44-
APPENDIX
PH CONTROLLER 8205
A2: Rules for adjusting PID controllers
The litterature on control systems specifies a series of adjustment rules with which a favorable
adjustment of controller parameters can be achieved experimentally. To avoid bad adjustments,
the conditions under which the respective adjustment rules have been elaborated must always
be observed. In addition to the characteristics of the controlled system and of the controller itself,
it is important to know whether it is intented to balance out a disturbance change or a command
variable change.
Adjustment rules according to Ziegler and Nichols (oscillation method)
When using this method, controller parameters are adjusted on the basis of the control loop's
response at the stability limit. In doing so, the controller parameters are adjusted so as to ensure
that the control loop begins to oscillate. A conclusion as to a favorable adjustment of the controller
parameters is reached from critical characteristic values occurring in this case. It goes without
saying that, when using this method, it must be possible to bring the control loop to oscillation.
Method:
- Set the controller as a P controller (i.e. Tn = 999, Tv = 0), initially selecting a low Kp value.
- Set the required setpoint.
- Increase Kp until the controlled variable oscillates continuously without attenuation (see following
figure).
X
Actual value
Tcrit
t
Figure : Progression of the control variable at the stability limit
The proportional action coefficient set at the stability limit is referred as Kcrit. The resulting
oscillation period is referred to as Tcrit.
E-45-
APPENDIX
PH CONTROLLER 8205
On the basis of Kcrit and Tcrit, the controller parameters can then be calculated in accordance with
the following table:
Parameter settings according to Ziegler und Nichols :
Controller type
Parameter settings
P controller
P controller
P controller
Kp = 0,5 Kcrit
Kp = 0,45 Kcrit
Kp = 0,6 Kcrit
Tn = 0,85 Tcrit
Tn = 0,5 Tcrit
Tv = 0,12 Tcrit
The Ziegler and Nichols adjustment rules were determined for P systems with a time delay of the
first order and a dead time. However, they apply only to controllers with a disturbance response,
but not to controllers with a command response.
Adjustment rules according to Chien, Hrones and Reswick (manipulated variable methode):
When using this method, the controller parameters are adjusted on the basis of the control
system's transition response. A 100% change in the manipulated variable is output. The time Tu
and Tg are derived from the progression of the actual value of the control variable (following
figure). Ks is the proportional action coeffficient of the control system.
Y
100%
Y
t
Actual value
X
KS. X
X
t
Tu
Tg
Figure : Progression of the controlled variable after a manipulated variable change ∆Y
Method :
- Set the controller to MANUAL mode.
- Output a manipulated variable change and record the controlled variable with a recorder.
- Switch off in good time if you encounter critical progressions (e. g. a risk of overheating) (Pay
attention to the fact that, in thermally inert systems, the actual value of the controlled variable
may increase further switching off).
E-46-
PH CONTROLLER 8205
APPENDIX
The following table lists the settings for the controller parameters depending on Tu, Tg and Ks for
command and disturbance response and for an aperiodic control operation as well as a control
operation with 20% overshoot. They apply to systems with a P response, with a dead time and with
a delay of the 1st order.
Parameter settings according to Chien, Hrones and Reswick :
Parameter settings
Controller
type
Aperiodic control operation
(0% overshoot)
Control operation with
20% overshoot
Command
Disturbance
Command
Disturbance
Tg
Kp = 0,3 Tu • Ks
Tg
Kp = 0,7 Tu • Ks
Tg
Kp = 0,7 Tu • Ks
Tg
Tg
Kp = 0,6 Tu • Ks
Tu • Ks
Tg
Kp = 0,6 Tu • Ks
Tg
Kp 0,7 Tu • Ks
Tn = Tg
Tn = 2,3 • Tu
Tg
Tu • Ks
P controller
KP = 0,3
PI controller
Kp = 0,35
Tn = 1,2 Tg
PID controller
Kp = 0,6
Tg
Tu • Ks
Tn = Tg
Tv = 0,5 • Tu
Tn = 4 • Tu
Kp = 0,95
Tg
Tg
Tg
Kp = 0,95
Kp = 1,2
Tu • Ks
Tu • Ks
Tu • Ks
Tn = 2,4 • Tu
Tv = 0,42 • Tu
Tn = 1,35 • Tg
Tv = 0,47 • Tu
Tn = 2 • Tu
Tv = 0,42 • Tu
As shown in the figure of the previous page, the proportional action coefficient Ks of the control
system can be calculated by way of the increase in the inflectional tangent, i. e. by way of ∆X / ∆Y
(∆Y: manipulated variable change)
Ks =
∆X
∆Y
E-47-
PH CONTROLLER 8205
E-48-
REGULATEUR DE PH 8205
F-49-
REGULATEUR DE PH 8205
F-50-
REGULATEUR DE PH 8205
Australia
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F-51-
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REGULATEUR DE PH 8205
F-52-
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