Burkert 8223 User manual

Instruction Manual
8223
INDUCTIVE CONDUCTIVITY SENSOR
© Bürkert 2001 Subject to technical change without notice

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INTRODUCTION
Table des matières
INTRODUCTION............................................................................................................... 2
1.1 Symbol used .............................................................................................................. 3
1.2 General safety instructions .................................................................................... 3
QUICK START................................................................................................................... 4
2.1 Quick installation guide........................................................................................... 4
CONFIGURATION............................................................................................................ 6
3.1 General comments................................................................................................... 6
3.2 Measuring range....................................................................................................... 6
3.2.1 Measuring range of the conductivity............................................................................6
3.2.2 Measuring range of the temperature...........................................................................8
3.3 Filtering level.............................................................................................................. 9
3.4 Temperature compensation .................................................................................10
3.4.1 Specific compensation......................................................................................................... 10
3.4.2 Linear compensation............................................................................................................. 11
3.5 Transmission of the temperature.........................................................................12
3.6 Calibrating the “zero conductivity” point...........................................................12
INSTALLATION ...............................................................................................................13
4.1 Mounting instructions............................................................................................13
4.1.1 Temperature-pressure diagram..................................................................................... 13
4.1.2 Installation recommendations......................................................................................... 13
4.2 Mounting...................................................................................................................14
4.3 Electrical connection instructions.......................................................................15
4.3.1 Mounting and connection of the EN 175301-803 connector........... 15
4.3.2 Connecting the 8223 to an external device (PLC,...) ..................................16
4.3.3 Precautions during installation and commissioning.....................................16
4.4 Examples of connections with a 8223 sensor.........................................................17
MAINTENANCE..............................................................................................................18
5.1 Maintenance ............................................................................................................18
5.2 If a problem occurs................................................................................................18
TECHNICAL DATA .........................................................................................................20
6.1 Process characteristics.........................................................................................20
6.2 Electrical characteristics.......................................................................................20
6.3 User characteristics...............................................................................................21
6.4 Safety ........................................................................................................................21
6.5 Environment.............................................................................................................21
6.6 Conformity with standards ...................................................................................21
6.7 Dimensions (mm)....................................................................................................22
INFORMATION...............................................................................................................23
7.1 Standard delivery....................................................................................................23
7.2 Ordering table for sensors 8223........................................................................23
7.3 Ordering table for spare parts.............................................................................23
7.4 Measurement principle..........................................................................................24
7.5 Label description....................................................................................................24
7.6 Declaration of conformity......................................................................................26

3
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INTRODUCTION
1.1 SYMBOL USED
Indicates information which must be followed. Failure to follow the infor-
mation could endanger the user and affect the function of the device.
1.2 GENERAL SAFETY INSTRUCTIONS
Before installing or using this product, please read this manual and any
other relevant documentation to ensure you fully benefit from all the
advantages the product can offer.
- Please verify that the product is complete and free from any damage.
- It is the customer's responsibility to select an appropriate sensor for the
application, ensure the unit is installed correctly, and maintain all components.
- This product should only be installed or repaired by specialist staff using the
correct tools.
- Please observe the relevant safety regulations throughout the operation,
maintenance and repair of the product.
- Always ensure that the power supply is switched off and the pipes / tank do
not contain any pressure before working on the device / system.
- This electronic device is sensitive to electrostatic discharge. To avoid any
damage by immediate electrostatic discharge, pay attention to the
requirements of EN 100 015-1.
- Always protect the device from electromagnetic perturbations, ultraviolet radiations
and, when installed outside, from the effects of climatic conditions.
- If these instructions are ignored or the device is not used according to the
specifications, no liability will be accepted and the guarantee on the device and
accessories will become invalid.

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QUICK START
2.1 QUICK INSTALLATION GUIDE
Order code
OK ?
Verify that the delivered
product is complete.
See § 7.1
Yes
No
Unscrew the 2 plugs
Select the measuring range
using SW1
Use a coin for instance
Select the filtering level using SW1
Select the temperature compensation
using SW2 *
Select the type of current output
using SW3
Open the EN 175301-803 connector
Connect the power supply cable to
the EN 175301-803 connector
Re-mount the EN 175301-803 con-
nector and connect it to the sensor
Green
LED flashes once briefly
every 2 s and current output
indicates 4 mA?
Yes
No
Press the push-
button for 2 s
Contact your
Bürkert agent
Install the appliance on the pipe
See the configuration
table opposite and
paragraph 3.2.
See the configuration
table opposite and
paragraph 3.3
See the configuration
table opposite and
paragraph 3.4
Ensure that the
cable is not
powered.
See § 4.1
Power the sensor
* or the transmission
of the temperature on
the 4-20 mA output.
See § 3.4 See the configuration
table opposite and
paragraph 4.3.2
Drive home
the connector
screw.
See § 4.3.1
The sensor
must be out of
the fluid.
See § 3.6
Unpack the
appliance

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QUICK START
1
2
3
4
4
3
2
1
Push-
button
SW3
sinking
sourcing
SW1
OFF<->ON
Green LED Red LED
SW2
ON<->OFF
<->
See also § 5.2 for any other LED flashing.
Measuring range Position of the switches of SW1
12
0 to 1 mS/cm OFF OFF
0 to 10 mS/cm
(default value) OFF ON
0 to 100 mS/cm ON OFF
0 to 1 S/cm ON ON
Filtering level Position of the switches of SW1
34
0 (no filtering)
(default value) OFF OFF
1 (min. filtering) OFF ON
2 (medium filtering) ON OFF
3 (max. filtering) ON ON
Temperature compensation Position of the switches of SW2
1234
No compensation
(default value) OFF OFF OFF OFF
Linear compensation
0.1% ON OFF OFF OFF
0.25% OFF ON OFF OFF
0.5% ON ON OFF OFF
0.7% OFF OFF ON OFF
1% ON OFF ON OFF
1.5% OFF ON ON OFF
2% ON ON ON OFF
3% OFF OFF OFF ON
5% ON OFF OFF ON
Specific
compensation
NaOH OFF ON OFF ON
HNO3ON ON OFF ON
H2SO4OFF OFF ON ON
NaCl ON OFF ON ON
Not used OFF ON ON ON
Transmission of the
temperature to the
4-20 mA output
Position of the switches of SW2
1234
ON ON ON ON
Type of current output Position of switch SW3
Sinking (default value) Up
Sourcing Down
Green LED Red LED Status of the sensor when operating faultless
ON ON Calibration of the "zero conductivity" in progress
Flashes once briefly
OFF
Measurement of a nil conductivity (< 2% of the full scale)
Flashes at a fequency
between 0,5 and 16 Hz Measurement of a conductivity which is proportional to this frequency

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CONFIGURATION
3.1 GENERAL COMMENTS
Configuration is done by means of accessible switches after having unscrewed the plugs
counterclockwise and removed them.
- SW1 allows the selection of:
- the measuring range (switches 1 and 2)
- the filtering level of the conductivity (switches 3 and 4)
- SW2 allows the selection of the temperature compensation or the
transmission of the temperature on the 4-20 mA output.
- SW3 allows the selection of the current output mode, sinking or sourcing.
- The push-button allows the calibration of the sensor «zero conductivity» point.
3.2 MEASURING RANGE
The 4-20 mA output delivers a current which is proportional to the compensated or not
compensated conductivity or to the measured temperature. For the conductivity, the user
may choose the measuring range.
When the conductivity exceeds the full scale by 10%, the current output delivers a 22 mA
current. As soon as the conductivity is again equal or inferior to the full scale value, the current
output delivers a current between 4 and 20 mA.
3.2.1 Measuring range of the conductivity
SW1 makes it possible to select the conductivity measuring range:
- a 4 mA current indicates a conductivity which is equal to 0 mSiemens/cm
(less than 2% of the selected full scale)
Push-button
SW1 SW2
Green LED Red LED
SW3
Measuring range Position of the switches of SW1
12
0 to 1 mS/cm OFF OFF
0 to 10 mS/cm
(default value) OFF ON
0 to 100 mS/cm ON OFF
0 to 1 S/cm ON ON

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CONFIGURATION
- a 20 mA current indicates a conductivity which is equal to either:
- 1 mSiemens/cm (mS/cm)
- 10 mS/cm
- 100 mS/cm
- 1 S/cm
The conductivity depending on the material the used fitting is made of and its dia-
meter, the full scale value must be re-calculated using the following formula:
FS = FSsx CF
where FS = Full Scale value to be programmed on the PLC
FSs= selected Full Scale
C
F= Correction factor of the fitting used: see the following tables
- If a fitting with DN15, 20 or 25 is used, use the correction factor of the DN32
- If a fitting with a DN > 100 or a vessel is used, apply a correction factor = 1.
Example:
The 8223 sensor is installed in a PVDF S020 fitting with DN32.
The selected full scale is FSs = 10 mS/cm.
The correction factor for this fitting is CF= 1,113.
Thus: FS = FSsx CF = 10 x 1,113 = 11,13 mS/cm
DN of the
fitting
Correction factor
Weld-ends / Internal and external threads True-union / Solvent and fusion spigots
Brass Stainless steel PVDF PP PVC
DN32 0.991 0.989 1.113 1.098 1.093
DN40 0.989 0.989 1.049 1.045 1.045
DN50 0.985 0.983 1.022 1.021 1.022
DN of the
fitting
Correction factor
Weld-ends Saddles
Brass Stainless steel PVDF PP PVC
DN65 - 0.993 1.020 1.019 1.025
DN80 - 0.995 1.020 1.019 1.022
DN100 - 0.998 1.019 1.017 1.010

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CONFIGURATION
Example:
If the selected measuring range is: „0 to 10 mS/cm”.
When the fluid conductivity measured by the sensor is < 2% of the full scale,
the 4-20 mA output delivers a 4 mA current; When the conductivity measured by the
sensor is equal to 10 mS/cm, the 4-20 mA output delivers a 20 mA current.
The curve hereunder shows the ratio between the measured conductivity and the
current value delivered by the 4-20 mA output.
When the conductivity exceeds the full scale by 10% (11 mS/cm in the example), the cur-
rent output delivers a 22 mA current. As soon as the conductivity is again equal or inferior
to the full scale value, the current output delivers a current between 4 and 20 mA.
3.2.2 Measuring range of the temperature
- The value of the temperature which corresponds to a 4-mA current is always -10 °C
- The value of the temperature which corresponds to a 20-mA current is always 80 °C
If the 8223 has been programmed to transmit the temperature (and not the conduc-
tivity) on the 4-20 mA output (all SW2 switches are set to ON), the corresponding
temperature/4-20 mA-output curve is the following:
The current output delivers a 22 mA current if the temperature is < -10 °C or > 80 °C.
4
20
mA
010 mS/cm
5
12
0,2
22
11
Green
LED
Red
LED
0,5 - 16 Hz
every 2 s
every
2 s
4
20
mA
080
°C
35
12
22
-10

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8223
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CONFIGURATION
mS/cm
mS/cm
mS/cm
mS/cm
t (s)
t (s)
t (s)
t
(
s
)
3.3 FILTERING LEVEL
Filtering allows the attenuation of fluctuations in the conductivity. The 8223 sensor has
four filtering levels, from 0 to 3:
- Level 0 corresponds to a nil filtering: the sensor indicates any conductivity variation
- Level 3 corresponds to the maximum filtering: the sensor smoothes the
conductivity variations at the most
- Levels 1 and 2 correspond to intermediate filterings.
SW1 allows the selection of the filtering level:
Level 0 filtering
Level 1 filtering
Level 2 filtering
Level 3 filtering
Filtering level Position of the switches of SW1
34
0 (no filtering)
(default value) OFF OFF
1 (min. filtering) OFF ON
2 (medium filtering) ON OFF
3 (max. filtering) ON ON

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CONFIGURATION
3.4 TEMPERATURE COMPENSATION
The conductivity varies with the temperature; To compensate the variations, the 8223
sensor measures the real conductivity and temperature of the fluid then re-calculates the
conductivity corresponding to a temperature of 25 °C.
SW2 makes it possible to choose the calculation mode of the temperature compensation.
Three calculation modes are possible, either:
- a specific compensation: 4 compensation curves are memorized by the
sensor for the following solutions: NaOH (sodium hydroxyde), HNO3(nitric
acid), H2SO4(sulphuric acid), and NaCl (sodium chloride).
- a linear compensation: 9 compensation factors, from 0.1 to 5% can be chosen.
- no compensation.
3.4.1 Specific compensation
The specific compensation curves for NaOH (sodium hydroxyde), HNO3(nitric acid) and
NaCl (sodium chloride) are valid for temperatures ranging from 10 to 70 °C.
The specific compensation curve for H2SO4(sulphuric acid) is valid for temperatures
ranging from 5 to 55 °C.
The compensation has been determined at the following concentrations:
NaOH : 1%
HNO3: 1%
NaCl : 0,2%
H
2SO4: 20%
- The NaCl specific curve is valid for concentrations ranging from 60 mg/l
(conductivity ≅100 µS/cm) to 270 g/l (conductivity ≅220 mS/cm).
- The NaCl compensation curve can be used for some dilute solutions.
- If the fluid of your process does not correspond to any specific solution, use one
of the linear compensations.

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CONFIGURATION
3.4.2 Linear compensation
If no specific compensation curve corresponds to your process, use one of the 9 linear
compensation factors by using SW2.
If you do not know the compensation factor (average α) of your process, you can deter-
mine it by doing the following:
1) Measure the conductivity of the fluid at 25 °C ( )
2) Measure the conductivity of the fluid at a temperature T( )
3) Apply the following formula to determine the αfactor:
4) Use the compensation factor nearest to the calculated one:
25
°
T
α = χ
χ
Tx1
25°
χ
25°
25°T
χ
χ25
25 C T C
Τ
χ
T
Temperature compensation Position of the switches of SW2
1234
No compensation
(default value) OFF OFF OFF OFF
Linear compensation
0.1% ON OFF OFF OFF
0.25% OFF ON OFF OFF
0.5% ON ON OFF OFF
0.7% OFF OFF ON OFF
1% ON OFF ON OFF
1.5% OFF ON ON OFF
2% ON ON ON OFF
3% OFF OFF OFF ON
5% ON OFF OFF ON
Specific
compensation
NaOH OFF ON OFF ON
HNO3ON ON OFF ON
H2SO4OFF OFF ON ON
NaCl ON OFF ON ON
Not used OFF ON ON ON

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CONFIGURATION
3.5 TRANSMISSION OF THE TEMPERATURE
If, instead of the conductivity, the 8223 sensor is meant to transmit the temperature
(between -10 °C and 80 °C) to the 4-20 mA output, configure SW2 as follows:
Thus the conductivity measuring range chosen with SW1 is not taken into account.
3.6 CALIBRATING THE “ZERO CONDUCTIVITY” POINT
The “zero conductivity” point of the sensor can drift in time. To check whether the sensor is
correctly calibrated or not, measure the conductivity of the air (conductivity = 0).
- Dismantle the sensor from the pipe.
Ensure the finger orifice the fluid passes through is clean and dry.
- If the conductivity of the air > 0 (the current output indicates a value > 4 mA and
the green LED flashes at a frequency between 0.5 and 16 Hz), press the push
button for at least 2 s: both LEDs light up and the sensor starts calibrating its
zero conductivity” point.
The operation can last a few minutes.
The calibration is finished when the two LEDs are not steadily lit any more. Then:
- If the red LED switches off and the green LED flashes rapidly every 2 s, the sensor
is correctly calibrated.
- If the green LED lights up and the red LED flashes 3 or 4 times every 2 s, the
calibration has failed: press the push-button briefly to go back to normal operating
using the parameters of the previous calibration.
- If the calibration fails several times in a row, contact your Bürkert agent.
Push-button
Green LED Red LED
Transmission of the
temperature to the
4-20 mA output
Position of the switches of SW2
1234
ON ON ON ON

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INSTALLATION
4.1 MOUNTING INSTRUCTIONS
4.1.1 Temperature-pressure diagram
The sensor and the fitting in which it is installed have limited operating temperatures and
pressures. The diagram hereunder shows the operating range of the 8223-fitting assem-
bly, for each fitting material:
A: Operating range of the assembly 8223+fitting
4.1.2 Installation recommendations
Choose a mounting position which avoids the building of air bubbles or cavities within the
finger orifice.
Position 1: horizontal or vertical mounting onto a pipe.
Position 2: mounting on a vessel without stirring
Position 3: mounting on a vessel with stirring
- When dismounting the sensor from the pipe, take all the precautions
related to this process.
- Ensure the fluid passage orifice is in the direction of the flow.
1
2
3
-10 +20 +40 +60 +80 +100
0
2
1
3
4
5
6
7
8
P [bar]
0
T [°C]
A
PVC
PP
PVDF
Metal

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INSTALLATION
4.2 MOUNTING
The 8223 conductivity sensor is installed on a pipe as follows:
- Insert the nut [4] on the fitting [6] and clip the ring [3] in the groove [5].
- Insert the sensor [1] into the fitting [6] by ensuring the gasket [2] is in its right place.
- Screw on the nut and tighten by hand only.
- Ensure the gasket material (FKM in standard) is chemically compatible
with your process.
- One EPDM gasket and one FKM gasket are additionally supplied with
the sensor.
- Make sure the gasket is not damaged when replacing it.
1
3
4
5
6
2

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INSTALLATION
1
3
2
4.3 ELECTRICAL CONNECTION INSTRUCTIONS
Always ensure that the appliance is not powered before working on it. All the connections must be
disconnected.
- Use a shielded cable with a limit operating temperature > +80°C.
- Under normal conditions of use, a shielded cable of 0.75 mm2section is sufficient
for signal transmission.
- Do not install the line close to high voltage or high frequency cables.
- If adjacent laying is unavoidable, keep a minimum distance of 30 cm.
- Connect the shielding to earth.
- Use a quality power supply (filtered and regulated).
- Do not open or cable the sensor when powered.
- It is essential that a 100 mA fuse be used for the power supply.
4.3.1 Mounting and connection of the EN 175301-803 connector
- Remove part [3] from part [2].
- Unscrew the cable gland [5].
- Insert cable into part [2] via cable gland.
- Wire part [3] (see below)
- Replace part [3].
- Tighten the cable gland [5].
- Place gasket [4] between the connector and the
fixed connector of the 8223.
- Connect the connector to the 8223.
- Tighten screw [1] to ensure tightness and correct electrical contact
Always check the connection of the connectors to ensure correct opera-
tion of the appliance.
L+
(12-30 VDC)
4-20 mA output
L-
Not connected
1
3
4
5
6
2

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INSTALLATION
4-20 mA
+
-
12-30 VDC
+
-
100 mA
I
1
3
2
SW3
4-20 mA
+
-
12-30 VDC
+
-
100 mA
I
1
3
2
SW3
4.3.2 Connecting the 8223 to an external device (PLC,...)
The 8223 sensor can be connected to a PLC or any other device which is able to use the
4-20 mA signal transmitted by the sensor.
The connection can be carried out either in sourcing or in sinking mode, as shown by the
figures below:
SW3 must be configured correctly when the sensor is not powered, de-
pending on the connection mode chosen.
4.3.3 Precautions during installation and commissioning
- When the appliance is powered and the cover is open, the protection against electrical
shocks is no longer effective.
- Always verify the chemical compatibility of the materials which are in contact with the
fluid to be measured.
- When cleaning the appliance use products which are chemically compatible with the
materials in the appliance.
- Do not insert any object (screwdriver for instance) within the finger orifice. When the
orifice is dirty, use compressed air to clean it.
PLC PLC
Connection in sourcing mode Connection in sinking mode
Type of current output Position of switch SW3
Sinking (default value) Up
Sourcing Down
not connected not connected

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INSTALLATION
4.4 EXAMPLES OF CONNECTIONS WITH A 8223 SENSOR
Between the 8223 sensor and the 1067
positioner.
Between the 8223 sensor and a sole-
noid valve with 8624-2 PI controller.
Between the 8223 sensor and the 8630 Top
Control mounted on a 2031 diaphragm valve
8223
+
-
24 V=
1
32
L+
L-
I
SW3
1067
4-20 mA
8223
+
-
24 V=
1
3
2
L+
L-
SW3
43
12
43
1
Setpoint + Setpoint -
24 V=
+
-
910 78
65
34 12
+-+- +-
I
+24 V
-
SW3
1
3
2
2031+ 8630
8223
4-20 mA
L-
L+
not connected
not connected
not connected

18 8223
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MAINTENANCE
5.1 MAINTENANCE
The 8223 sensor may be cleaned with water or a product which is compatible with the
materials therein.
Your Bürkert supplier is available to provide you with any additional information you
require.
5.2 IF A PROBLEM OCCURS...
An error is indicated by lighting up of the green LED, special flashing of the red LED and
the transmission of a 22-mA current to the current output.
The following table lists possible faults that can occur and their solutions:
Problem
Green
LED
status
Red
LED
status
Current
output
status
Possible cause Do the following See
also
The sensor
does not
work
OFF OFF 0 mA
The sensor is not con-
nected Connect the sensor 4.3
The fuse of the installation
is in a bad condition Change the fuse -
The switch of the installa-
tion is set to OFF
Set the switch to
ON -
The power supply has
been wrong connected to
the + and - terminals
Check the wiring 4.3
The power supply is not
stable or < 12 VDC
Change the power
supply -
The sensor
measures a
wrong con-
ductivity
flashes
briefly OFF 4 mA
The "zero conductivity"
point has been calibrated
within the fluid or the "zero
conductivity" point has
drifted
carry out a calibra-
tion in air 3.5
flashes OFF -
The finger is dirty Clean the sensor
finger 5.1
Air bubbles appear within
the finger orifice
Follow the mountign
instructions 4.1.2
The temperature compen-
sation is not correct
Select an appro-
priate compensation 3.4
The conductivity fluctua-
tions are very important
Select a higher filte-
ring level (SW1) 3.3

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MAINTENANCE
Problem
Green
LED
status
Red LED
status
Current
output
status
Possible cause Do the following See
also
The sensor
transmits a
nil conduc-
tivity
flashes
briefly OFF 4 mA The chosen measuring range is not appropriate
Select the lower
measuring range
(SW1)
3.2
The sensor
transmits
no current
at all
flashes flashes 0 mA
SW3 is not set correctly
(sinking or sourcing) Modify SW3 4.3.2
The current output is not
connected properly
Re-connect the
current output 4.3
The sensor
is stopped
- an error is
indicated
ON
flashes
once
briefly
every 2 s
22 mA The conductivity > full scale
+ 10%
Select the next
measuring range
(SW1)
3.2.1
ON
flashes
twice
briefly
every 2 s
22 mA The fluid temperature
< -10 °C or > +80 °C
Bring the fluid
temperature back
to a value within the
sensor measuring
range
3.2.2
ON
flashes
3 or 4
times
briefly
every 2 s
22 mA The "zero conductivity" point
calibration failed
Press the push-
button briefly.
If the error persists,
send the device
back to Burkert.
3.6
flash simultaneously 22 mA The sensor is out of service Send the device
back to Burkert -

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TECHNICAL DATA
6.1 PROCESS CHARACTERISTICS
Conductivity measurement
- Type of measurement Inductive conductivity measurement
- Measuring range 0 µS/cm to 1 S/cm
- Precision +/-2% of the selected measuring range
(within the range 0-70 °C)
- Temperature deviation 0.2% / °C max.
- Answering time at a strong
conductivity change < 1 s
- Sampling frequency measurement every 250 ms
Temperature measurement
- Type of measurement digital measurement
- Measuring range -10 °C to 80 °C
- Precision +/- 0.5 °C
- Answering time at a strong
conductivity change 100 s
- Sampling frequency 250 ms
Process data
- Pipe interface standard Bürkert fitting
- Pressure class PN6
- Fluid temperature range -10 °C to 80 °C
- Materials in contact with the fluid Finger: PVDF, PEEK or PP
Seals: FKM or EPDM
6.2 ELECTRICAL CHARACTERISTICS
Pulse rate output
- Output type current output from 4 to 20 mA (error signal at 22 mA)
- Electrical wiring Wiring in sourcing or sinking mode, can be
selected by bipolar reverser
- Max. load resistance 1000 Ohms with a power supply of 30 V
690 Ohms with a power supply of 24 V
300 Ohms with a power supply of 15 V
150 Ohms with a power supply of 12 V
- Adjustment 4 conductivity ranges and 1 temperature range,
can be selected by switch
Electrical connection
- Power supply voltage 12 to 30 VDC, filtered and regulated
- Maximum current consumption 50 mA max. + 22 mA for the current output
- Connector type EN 175301-803