optisens odo 2000

optisens odo 2000
OPTISENS ODO 2000
Technical Datasheet
Sensor for dissolved oxygen measurement in water and
wastewater
• Rugged design for harsh applications
• Integrated transmitter with direct 4...20 mA output
• Optical disk with luminophore and sun protection
The documentation is only complete when used in combination with the relevant
documentation for the signal converter.
© KROHNE 08/2016 - 4003688801 - TD OPTISENS ODO 2000 R01 en
CONTENTS
OPTISENS ODO 2000
1 Product features
3
1.1 Dissolved oxygen sensor for water and waste water application. .................................. 3
1.2 Design and options ........................................................................................................... 4
1.3 Measuring principle.......................................................................................................... 5
2 Technical data
6
2.1 Technical data................................................................................................................... 6
2.2 Dimensions and weight .................................................................................................... 8
3 Installation
3.1
3.2
3.3
3.4
3.5
9
Installation procedure ...................................................................................................... 9
Configuration of a measuring point ................................................................................. 9
Sensor use with cleaning function ................................................................................. 10
Sensor use without cleaning function............................................................................ 11
Mounting the sensor into an assembly .......................................................................... 11
4 Electrical connections
4.1
4.2
4.3
4.4
12
Connecting the sensor cable to the signal converter.................................................... 12
Connecting the sensor directly to the control system................................................... 14
Connecting the sensor to PC.......................................................................................... 14
Connecting the power supply to the signal converter MAC 100.................................... 15
5 Order information
17
5.1 Order code ...................................................................................................................... 17
5.2 Consumables .................................................................................................................. 18
6 Notes
2
19
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PRODUCT FEATURES 1
OPTISENS ODO 2000
1.1 Dissolved oxygen sensor for water and waste water application.
Dissolved oxygen measurement is widely used in drinking water and wastewater applications.
The oxygen measurement is used for aeration monitoring and control in water and waste water
plants.
The optical oxygen sensor OPTISENS ODO 2000 from KROHNE has a standardized robust design
for open channel measurement and a long lifespan. The sensor can be deployed in any size of
water treatment plants may it be small or big. The integrated spray cleaning nozzle minimize the
need for manual cleaning, which means longer intervals between maintenance and calibration.
Figure 1-1: Luminophore disk with flushing nozzle
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1 PRODUCT FEATURES
OPTISENS ODO 2000
Highlights
•
•
•
•
•
•
Precise dissolved oxygen measurement in the ppm range with a resolution of 0.01ppm
Long-term stability due to reduced clogging by integrated spray cleaning nozzle
Low cost of ownership due to an integrated transmitter
Easy changeable optical disk
Short response time for all applications
Suitable for installation with telescopic rod SENSOFIT IMM 2000
Industries
• Water and waste water industry
Applications
• Aeration monitoring in water and waste water treatment plants
1.2 Design and options
This submersible oxygen sensor provides a 4...20 mA
current loop or a RS485 output.
The serial interface allows commands entered via the
hyperterminal of a personal computer, the transmission of
the measurement and check signal, the scale selection, the
analog or digital operating mode selection, the zero and
sensitivity calibration. The sensor is suitable for connection
to a signal converter.
The cleaning of the sensing element is performed by the
injection of pressurised clean air, provided by the user.
It can be easily adapted to various application requirements
and can be installed directly into a basin with a telescopic
rod.
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PRODUCT FEATURES 1
OPTISENS ODO 2000
1.3 Measuring principle
The application of optical oxygen measurement has been studied extensively since the mid
1980s. The optical oxygen sensor contains an oxygen sensitive dye (fluorophore) that is
immobilised in an oxygen permeable polymer matrix layer and in direct contact with the process
media.
The fluorophore is excited by the energy-rich blue light emitted by the LED inside the sensor into
an excited state. This energy can be emitted from the excited fluorophore after a short period
(micro seconds) by emission of low-energy red light. In case an oxygen molecule is getting in
contact with the excited fluorophore, the energy can also be transferred from the excited
fluorophore in a non-radiative reaction to the oxygen. In that case the intensity of the emitted red
light from the polymer matrix layer is decreased (fluorescence quenching). Consequently, the
intensity of the emitted red light is decreased with increasing oxygen content. The intensity of the
emitted red light is measured with a light detector. The change in intensity is used to measure
the oxygen concentration in the process media. To compensate the intensity drift of the light
emitting blue LED its intensity is directly measured with a second light detector.
Figure 1-2: Optical measurement of dissolved oxygen
1
2
3
4
5
6
Process media with dissolved
Color filter
2 identical light detectors
LED
Carrier
Fluorescent layer
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2 TECHNICAL DATA
OPTISENS ODO 2000
2.1 Technical data
• The following data is provided for general applications. If you require data that is more
relevant to your specific application, please contact us or your local sales office.
• Additional information (certificates, special tools, software,...) and complete product
documentation can be downloaded free of charge from the website (Downloadcenter).
Measuring system
Parameter
Dissolved Oxygen
Measuring principle
Fluorescence
Design
Measuring principle
Optical, luminophore disk
Measuring scale
0...20 mg/l (ppm)
Sensor type
Installation with MAC 100 signal converter or directly to control
system via 4...20 mA
Shaft diameter
60 mm / 2.36"
Shaft length
166 mm / 6.5"
Sensor thread
2" NPT
Hose diameter
6.3...9.5 mm / 1/4...3/8"
Operating conditions
Temperature range
-5...50°C / +23...122°F
Pressure range
Max. 1 bar at 25°C / 14.5 psi at 77°F
Measuring range
0...20 mg/l (ppm)
Accuracy
± 0.1 ppm if < 1.0 %ppm / ± 1.0 %sat if < 10.0 %sat
± 0.2 ppm if > 1.0 %ppm / ± 2.0 %sat if > 10.0 %sat
Repeatability
± 0.5% of the scale
Resolution
0.01 ppm
Response time (95%)
large signal (>3% air) 95% < 40 seconds
small signal (<3% air) 95% < 120 seconds
Measuring cycle
8 seconds
Drift
< 1% year
Relative humidity
0...95% non condensing
Air pressure cleaning
max. 3 bar / 43.51 psi
Units displayed sensor
mg/l (ppm) or %
Units displayed converter
mg/l (ppm)
Temperature sensor
Pt100
Installation conditions
6
Ingress conditions
IP68
Weight
Body 420 g / 0.93 lb
10 meter cable 760 g / 1.41 lb
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TECHNICAL DATA 2
OPTISENS ODO 2000
Materials
Sensor body
PVC
Electrical connection
Cable
10 meter / 32.8 ft.
20 meter / 65.62 ft.
30 meter / 98.43 ft.
Voltage
9...36 VDC
Analog output
4...20 mA loop powered isolated
Load
600 Ohm max. at 24 VDC
Digital output
RS485
Approvals
CE
This device fulfils the statutory requirements of the EC directives. The manufacturer
certifies successful testing of the product by applying the CE mark.
Electromagnetic compatibility
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EMC Directive 2014/30/EU
EN 61326-2-3:2013
EN 55011:2009+A1:2010
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2 TECHNICAL DATA
OPTISENS ODO 2000
2.2 Dimensions and weight
e
f
Dimensions [mm]
8
Dimensions [inch]
a
60
2,4
b
18
0,71
c
15
0,6
d
100
3,94
e
140
5,51
f
25
0,98
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INSTALLATION 3
OPTISENS ODO 2000
3.1 Installation procedure
A new amperometric dissolved oxygen sensor needs to be calibrated before it is installed into its
final measuring location. To install the device in the correct way, follow the order and the
following sections and their instructions.
1. Mount the sensor into the immersion assembly. (For further information refer to the manual of
the assembly)
2. Connect the sensor to the signal converter or directly to the control system.
3. Configure the measurement range. Calibrate the sensor.
4. Install the sensor into its final measuring location.
3.2 Configuration of a measuring point
The sensor has a 4...20 mA current loop and can be operated with external signal converter or
without. If operated without the external converter the converter is needed as configuration and
calibration tool.
A complete measuring point consists of at least two or three parts:
• Optional: A signal converter (for configuration only as calibration tool or for operation)
• OPTISENS ODO 2000 sensor (including cable)
• Immersion assembly or other adequate housing
If automatic flushing is installed, an optional solenoid valve is necessary as well.
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3 INSTALLATION
OPTISENS ODO 2000
3.3 Sensor use with cleaning function
Most applications do not require the cleaning function if the sensor is installed correctly in a
correct angle.
When the automatic cleaning is required the device can be equipped with a cleaning hose for air
cleaning.
Before the device is installed into its final measuring location the following points must
be observed
•
•
•
•
provide hose (Ø 6.3...9.5 mm / 1/4...3/8") in suitable length
prepare a connection for the cleaning hose
push the hose onto the cleaning connector
put the sensor cable and cleaning hose through the adequate extension pipe of the mounting
assembly
The pressurised air is to be provided and must be clean with a max of 3 bar.
The typical cleaning time is 15 seconds and the typical cleaning frequency is 2 times/day, but this
will differ from application to application.
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INSTALLATION 3
OPTISENS ODO 2000
3.4 Sensor use without cleaning function
Without a cap on the air line connector the sample might block the cleaning drilling for later use
or water might flow into a closed assembly and damage the probe due to later handling.
Before installation and immersion the sensor check the following order:
• Do not install any flexible tubing.
• Install a cap on the air line connector in order to avoid the cleaning drilling to be blocked for
later use or water to flow through it into a closed assembly.
3.5 Mounting the sensor into an assembly
All work on the electrical connections may only be carried out with the power disconnected.
Do not turn the cable gland on the sensor this might cause a sensor leak and damage the
electronics inside. While mounting or dismounting the sensor, the senor cable must not be fixed
or trapped as this might loosen the water tight gland connection from the sensor.
For further instructions on installation into an immersion assembly refer to the assembly
manual.
Use an assembly that does not fix the sensor cable or require the sensor to be screwed into the
assembly. If the sensor needs to be screwed for mounting or dismounting make sure that the
sensor cable is turned into the same direction.
Installing procedure
• Insert the sensor cable through the immersion assembly.
• Fasten the sensor to the tip of the assembly.
• Connect the wires either to the control system directly (only 4...20 mA) or to the MAC 100
signal converter.
For removing the sensor, repeat the steps above in reverse order.
Calibrate the sensor before installing it into the assembly.
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4 ELECTRICAL CONNECTIONS
OPTISENS ODO 2000
4.1 Connecting the sensor cable to the signal converter
All work on the electrical connections may only be carried out with the power disconnected. Take
note of the voltage data on the nameplate!
Look at the device nameplate to ensure that the device is delivered according to your order.
Connect the dissolved oxygen sensor to the MAC100 for optimal configurability and
process control due to following features:
•
•
•
•
•
•
scale selection flexibility
digital input to hold signals during cleaning process
easy calibration via zero point and sensitivity adjustment
set minimum and maximum for alarm relays
galvanic isolated 4...20 mA outputs
error current
R3
Figure 4-1: Sensor connection terminals on the signal converter MAC 100
1
2
3
4
12
Sensor connection terminal
Relays
Terminal block A: terminals for sensors
Terminal block S (protective earth)
Wire
Terminal block Pos.A
White
J
Green
Q
Yellow
Y
Grey
V
None
W
brown
not connected
Wire
Terminal S
Metal (non isolated cable)
S
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OPTISENS ODO 2000
ELECTRICAL CONNECTIONS 4
Figure 4-2: Connecting the sensor cable
The following instructions describe the connection of the sensor cable.
Connecting the sensor cable to the signal converter
•
•
•
•
Remove the terminal cover.
Thread the sensor cable through the middle right cable gland 1.
Push the wires 7 into terminal J 3, Q 4, Y5, V 6 and S 2.
To remove a wire, press down the white clip 8 on the corresponding terminal and pull the
wire out.
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4 ELECTRICAL CONNECTIONS
OPTISENS ODO 2000
4.2 Connecting the sensor directly to the control system
Avoid cable interruptions. If necessary use adequate junction box. Keep the cable far away from
power cables inside of the switch board.
The device is loop powered and can be connected directly onto the control system via any
junction box.
Wire
Function
Green
+ current loop
White
- current loop
Metal
shield
The normal operation needs just the connection of the green and white wires, which are
protected against accidental inversion. The shield is not connected to the probe but it must be
connected to the ground.
4.3 Connecting the sensor to PC
Avoid cable interruptions. If necessary use adequate junction box. Keep the cable far away from
power cables inside of the switch board.
Connect the device to the converter or directly to the control system as stated in above chapters.
The shield is not connected to the probe but it must be connected to the ground.
14
Wire
Function
Shield
not connected
Yellow
A (+) RS485
Grey
B (-) RS485
Brown
not connected
Green
+ current loop
White
- current loop / COM RS485
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OPTISENS ODO 2000
ELECTRICAL CONNECTIONS 4
4.4 Connecting the power supply to the signal converter MAC 100
The device must be grounded in accordance with regulations in order to protect personnel
against electric shocks.
Never install or operate the device in potentially explosive areas, it might cause an explosion that
can result in fatal injuries!
When connecting the power supply, always note the safety regulations of the current state of the
art. Also note the following items to avoid fatal injuries, destruction or damage of the device or
measuring errors:
• De-energise the cables of the power supply before you start any installation works!
• Always keep the housing of the device well closed if you do not perform any installation
works. The function of the housing is to protect the electronic equipment from dust and
moisture.
• Assure that there is a fuse protection for the infeed power circuit (Inom ≤ 16 A) and a
disconnecting device (switch, circuit breaker) to isolate the signal converter.
• Check the nameplate and assure that the power supply meets the voltage and frequency of
the device. You can operate the device in the range of 100...230 VAC and 8 VA with a tolerance
of -15/+10% while 240 VAC +5% is included in the tolerance range (a version with a power
supply of 24 VAC/DC is in preparation). A power supply outside these specifications may
destroy the device!
• Assure that the protective earth conductor (PE) is longer than the L- and N-conductor.
The manufacturer has designed all creepage distances and clearances according to VDE 0110
and IEC 664 for pollution degree 2. The power supply circuits fulfil the overvoltage category III
and the output circuits fulfil the overvoltage category II.
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4 ELECTRICAL CONNECTIONS
OPTISENS ODO 2000
Before you start to connect the power supply cables, note the following drawing with the function
of the terminals:
1 L1...L3 (live)
2 Neutral
3 Protective Earth (PE)
Afterwards connect the power supply cables accordingly:
The manufacturer strongly recommends to use a slotted screwdriver with a tip of 3.5 x 0.5 mm /
0.14 x 0.02" to push down the lever! Otherwise you could damage the lever.
• De-energise the power supply cables with the help of a disconnecting device (switch, circuit
breaker)!
• Remove the cover of the power supply terminal (1) by pressing it down and pulling forwards
at the same time (2 and 3), be careful and do not disrupt the retaining band (it prevents the
cover from getting lost)!
• Use a slotted screwdriver with a tip of 3.5 x 0.5 mm / 0.14 x 0.02" to push down the lever,
connect the wires to the terminals and pull up the levers again (4 and 5).
• Refasten the cover of the power supply terminal, close the converter housing and tighten all
screws of the housing.
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ORDER INFORMATION 5
OPTISENS ODO 2000
5.1 Order code
The characters of the order code highlighted in light grey describe the standard.
VGA O
4
Sensor type
A OPTISENS ODO 2000
Measuring range
1
0...20 mg/l (ppm)
Sensor features
A 1 x 4...20 mA / RS485
Process conditions
1
-5...+50°C, 1 bar at 20°C / +23...+122°F, 14.5 psi
Enclosure type
B Submersible
Body material
1
PVC
Process connection
A 2" NPT (male)
Power supply
1
9...36 VDC / loop powered
Cable
B Cable-ODO-W 2000
Cable features
A Attached cable
Cable length
3
10 m / 33 ft.
4
20 m / 65.6 ft.
5
30 m / 98.4
Cable options
1
Core end sleeve
Sensor options
1
Flush nozzle
Documentation
VGA O
0
none
1
English
2
German
3
French
4
Spanish
4
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5 ORDER INFORMATION
OPTISENS ODO 2000
5.2 Consumables
18
Consumables
Order code
Limunophore disk, including mounting tool
XGA S 060050
Sodium sulfite (Na2 SO3) 1 x 1000 ml
XGA M 040010
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NOTES 6
OPTISENS ODO 2000
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K
K
K
© KROHNE 08/2016 - 4003688801 - TD OPTISENS ODO 2000 R01 en - Subject to change without notice.
KROHNE – Process instrumentation and measurement solutions
•
•
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Flow
Level
Temperature
Pressure
Process Analysis
Services
Head Office KROHNE Messtechnik GmbH
Ludwig-Krohne-Str. 5
47058 Duisburg (Germany)
Tel.: +49 203 301 0
Fax: +49 203 301 10389
info@krohne.com
The current list of all KROHNE contacts and addresses can be found at:
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