KROHNE OPTISENS OAM 1050 Instruction Manual

OPTISENS OAM 1050
OPTISENS OAM 1050OPTISENS OAM 1050
OPTISENS OAM 1050 Technical Datasheet
Technical DatasheetTechnical Datasheet
Technical Datasheet
Compact measuring system for turbidity
•Measurement according to ISO 7027 / US EPA 180
•Simple calibration with reusable liquid calibration standards
•Minimum maintenance due to automatic ultrasonic cleaning system
© KROHNE 07/2011 - TD OPTISENS OAM 1050 R02 en

CONTENTS
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OPTISENS OAM 1050
1 Product features 3
1.1 Turbidity measuring system with innovative cuvette technology.................................... 3
1.2 Options and variants......................................................................................................... 4
1.3 Measuring principle.......................................................................................................... 5
2 Technical data 6
2.1 Technical data table ......................................................................................................... 6
2.2 Dimensions and weight .................................................................................................... 8
3 Installation 9
3.1 Notes on installation ........................................................................................................ 9
3.2 Intended use ..................................................................................................................... 9
3.3 Requirements of the device.............................................................................................. 9
3.4 Installation order............................................................................................................ 10
3.4.1 Placing the desiccant pouch and the humidity indicator ..................................................... 10
3.4.2 Selecting site and mounting ................................................................................................. 11
3.4.3 Connecting the hoses............................................................................................................ 13
3.4.4 Drain vent .............................................................................................................................. 14
3.4.5 Inserting and fixing the flow through unit ............................................................................ 15
4 Electrical connections 16
4.1 Safety instructions.......................................................................................................... 16
4.2 Description of board and bulkheads .............................................................................. 16
4.3 Circuit breaker and specifications of power supply ...................................................... 17
4.4 Cable specifications........................................................................................................ 17
4.5 Installation order of the electrical connections............................................................. 17
4.5.1 Connecting the cables in the field terminal box................................................................... 18
4.5.2 Alarms terminal (signal output) ........................................................................................... 19
4.5.3 4...20 mA or RS 485 signal output.........................................................................................19
4.5.4 Connecting the sensor interconnect cable........................................................................... 20
5 Order information 21
5.1 Order code ...................................................................................................................... 21
6 Notes 22

PRODUCT FEATURES 1
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1.1 Turbidity measuring system with innovative cuvette technology
The compact turbidity measuring system OPTISENS OAM 1050
OPTISENS OAM 1050OPTISENS OAM 1050
OPTISENS OAM 1050 uses the 90°scattered light
method to scan liquid samples in glass cuvettes. This means that the measurement optics are
not directly exposed to the sample and thus require less maintenance.
Because the measuring cuvette can be simply and quickly replaced by standard cuvettes of
known turbidity, a recalibration is possible within a few minutes. Another feature is the
automatic ultrasonic cleaning function which removes deposits from the cuvette wall and and
lengthens service intervals in this way.
Highlights
•90°scattered light method according to ISO 7027 / US EPA 18
•Measuring range: 0…100 NTU/FNU (0…1000 NTU/FNU optional)
•Rapid response time due to small measurement volume
•Simple calibration with reusable liquid calibration standards
•Automatic ultrasonic cleaning to prevent mineral deposits
•Compact, space-saving design
•Integrated shut-off valve for maintenance work
•Optimal back pressure setting to avoid gas bubbles through integrated outlet valve
•Active current output / 2 alarm relays
•RS 485 / Modbus interface
1 Flow through unit with cuvette
2 Display and operating unit
3 Sample outlet
4 Sample inlet with pressure regulator

1PRODUCT FEATURES
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Industries
•Potable water treatment
•Water supply
•Process industry
Applications
•Monitoring the potable water quality
•Filter monitoring
•Monitoring of contamination
1.2 Options and variants
White light / infrared version
Calibration set
The OPTISENS OAM 1050 is available with two
different light sources. One with a NIR-LED for
compliance with ISO 7027 and alternatively a version
with a white light lamp for compliance with US EPA
regulations.
Additionally a version with an extended measuring
range of 1000 NTU/FNU can be provided.
(OPTISENS OAM 1050)
The calibration set contains three cuvettes with
liquids of three different turbidities (0,02, 10 and 100
NTU/FNU). With the help of this accessory you can
do a precise recalibration within a few minutes.
(Sensor close-up)

PRODUCT FEATURES 1
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1.3 Measuring principle
According to the US EPA definition, turbidity is the cloudy appearance of water caused by the
presence of suspended and colloidal matter. In the waterworks field, a turbidity measurement is
used to indicate the clarity of water. Technically, turbidity is an optical property of the water
based on the amount of light reflected by suspended particles and colloidal matter.
According to ISO 7027 turbidity values below < 40 NTU are measured with the 90°scattered light
method. Light source and receiver are positioned in a 90°angle to each other. The light
transmitted from the source is directed in equal strength to the reference receiver and into the
medium. The light is reflected from the particles and fractions of the scattered light are received
by the detector, which is positioned in a 90°angle. The meter compares the light from reference
and scattered light receiver and calculates the turbidity value.
The measuring units for the turbidity are:
•NTU (Nephelometric Turbidity Unit)
•FNU (Formazin Nephelometric Unit)
Figure 1-1: Measuring principle for turbidity measurement
1 Light source
2 Reference sensor
3 Sensor
4 Reflected light beam
5 Particles
6 Emitted light beam
4
1
2
3

2TECHNICAL DATA
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2.1 Technical data table
• 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 representative.
• Additional information (certificates, special tools, software,...) and complete product
documentation can be downloaded free of charge from the website (Download Center).
Measuring system
Measuring principle 90°scattered light method
Application range Turbidity measurement of liquids according to ISO 7027 and US EPA 180
Measuring range 0.02...100 NTU / FNU or 0.02...1000 NTU / FNU
Design
The measurement system consists of a sensor and a signal converter and is only available as compact version.
Display and user interface
Display and user interfaceDisplay and user interface
Display and user interface
Display Multi-line liquid crystal backlit display
Operating and display language English
Other properties
Other propertiesOther properties
Other properties
Response time Min. 5 seconds, adjustable
Alarms Two programmable, 120...240 VAC, 2A form C relay
Measuring accuracy
Reference conditions +1...+50°C / +33.8...+122°F
95% relative humidity
Altitude up to 2000 m / 6600 ft
Recalibration
Maximum measuring error <40NTU/FNU:±2% of reading or ±0.02 NTU/FNU whichever is greater
>40NTU/FNU:±5% of reading
< 10 NTU/FNU: 0.0001 NTU/FNU
Resolution Four decimal places below 10 NTU/FNU, decreases by one decimal place per
decade NTU/FNU

TECHNICAL DATA 2
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Operating conditions
Note: the device is not appropriate for outdoor use!
Temperature
TemperatureTemperature
Temperature
Process and ambient
temperature +1...+50°C / +33.8...+122°F
Storage temperature -20...+80°C / -4...+176°F
Pressure
PressurePressure
Pressure
Process pressure The integral pressure regulator is rated to 14 bar / 203 psi.
Ambient pressure Atmospheric, altitude up to 2000 m / 6600 ft
Flow velocity
Flow velocityFlow velocity
Flow velocity
Minimum 0.1 l/min / 0.026 gal/min
Maximum 1 l/min / 0.26 gal/min
Other conditions
Other conditionsOther conditions
Other conditions
Humidity Display and operating unit: up to 95% relative humidity (non-condensing)
Protection category Enclosure is designed to meet IP 66 / NEMA 4X
Installation conditions
Dimensions For detailed information refer to Dimensions and weight on page 8.
Weights Shipping weight: 2.5 kg / 5.5 lb
Materials
Sensor housing ABS
Wetted parts Nylon, Borosilicate Glass, Silicon, Polypropylene, Stainless Steel AISI 304
Electrical connections
Galvanic insulation Double insulated, pollution degree 2, overvoltage category II (all in- and outputs are
electrically isolated from each other and from power and earth ground)
Option: transformer isolated current output
Power supply
Power supplyPower supply
Power supply
Voltage 100...240 VAC, 47...63 Hz
Power consumption 80 VA
Outputs
OutputsOutputs
Outputs
Current output 1 x 4...20 mA, active, 15 VDC power source, max. load 600 Ω
Modbus Bi-directional, RS-485 Modbus RTU/ASCII
Relays 2 x relay 120...240 VAC, freely programmable
Approvals and certifications
CE This device fulfils the statutory requirements of the EC directives. The
manufacturer certifies successful testing of the product by applying the CE mark.
ETL Listed to UL 61010B-1 and certified to CSA 22.2 No. 1010.1-92

2TECHNICAL DATA
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2.2 Dimensions and weight
Dimensions Weight
[mm] ["] [kg] [lb]
a208 8.2 2.5 5.5
b51 2.0
c90 3.5
d30 1.2
e87 3.4
f148 5.8
g131 5.2
h347 13.7
i197 7.8
k62 2.4

INSTALLATION 3
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3.1 Notes on installation
3.2 Intended use
The OPTISENS OAM 1050 series consists of a white light version and an infrared version. Both
versions are designed to measure online the turbidity of water. Furthermore the two following
different measuring ranges are available: 0.02...100 NTU / FNU or 0.02...1000 NTU / FNU
3.3 Requirements of the device
The device was designed to require very low head pressure. Though the device offers a wide
pressure range, as it has an integrated pressure regulator:
•Head pressure range: 0.07...14 bar / 1...203 psi
•Maximum allowable flow rate of the cuvette: 0.1...1 l/min or 0.26...0.026 gal/min
•Maximum fluid temperature: +50°C / +122°F
Inspect the cartons carefully for damage or signs of rough handling. Report damage to the
carrier and to the local office of the manufacturer.
Check the packing list to check if you received completely all that you ordered.
Look at the device nameplate to ensure that the device is delivered according to your order.
Check for the correct supply voltage printed on the nameplate.

3INSTALLATION
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3.4 Installation order
To install the device in the correct way, follow the order of the following sections and their
instructions.
3.4.1 Placing the desiccant pouch and the humidity indicator
Execute the following steps to insert or replace the desiccant pouch and the humidity indicator
(Humonitor®card) or to inspect the seal:
• Move the lock ring counterclockwise and pull out the flow through cuvette (detailed
information on page 15).
• Unscrew the four corner thumbscrews of the flow through assembly manually according to 1
in the following drawing (if the screws are too tight, use a screwdriver for slotted grub
screws).
• Remove the upper half of the flow through assembly (2).
• Prior to installing the desiccant pouch for the first time, remove the shipping support (plastic
tube with a red flag reaching outside) within the upper part of the device; after removing you
can discard the tube.
• If you want to replace the desiccant pouch and the humidity indicator, take them out at first
(3).
• Take the shrinkpacked desiccant pouch and the humidity indicator out of the protective
packaging.
Installation, assembly, start-up and maintenance may only be performed by appropriately
trained personnel. The regional occupational health and safety directives must always be
observed.
A missing or saturated desiccant pouch affects not only the performance of the whole device, but
can also destroy the internal electronics!
If the seal at the device base does not fit properly or is defective, the lifetime of the desiccant
decreases. Therefore assure the following items:
• Do not start-up the device with a desiccant pouch missing, replace a saturated pouch!
• Replace the desiccant pouch when the display shows the message "DESC".
• Inspect the enclosure seal each time you replace the desiccant.
• If the seal is not properly seated or damaged, reseat or replace it!
The desiccant degrades prematurely after removing the protective packaging. Therefore do not
open the packaging before usage, install the desiccant pouch quickly and close the device as
soon as possible.

INSTALLATION 3
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• Put the humidity indicator on the bottom of the lower part of the flow through assembly and lay
the desiccant pouch on it (4and 5).
• Inspect the seal and reseat or replace it if necessary.
• Reassemble everything in reverse order (6).
• To expedite the recognition of the new desiccant, reset the powered device by disconnecting
the sensor interconnect cable for two seconds and reconnecting it.
3.4.2 Selecting site and mounting
The preferred way of mounting of the device is wall mounting. If this is not possible, you can
mount the device on any suitable level surface. Irrespective of this possibilities always note the
following guidelines:
•Choose a location that is easily accessible for operation and service and that is as close as
possible to the sampling point to ensure a quick response time (maximum distance: 3 m /
10 ft)
•Leave at least 20 cm / 8" of free space above the instrument for easy service (e.g. removal of
the flow head and insertion of calibration cuvettes), see position number 1in the next
drawing.
•Ensure that the front display rests at eye level.
•Refer to chapter "Dimensions" for the device dimensions.
•Use screws M6 / ¼" to fix the flow through assembly (position number 2) and M4 (3/16") to
fix the field terminal box (position number 3).

3INSTALLATION
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Mounting procedure
• Take a water-level, a pencil and ruler and use the dimensions provided in the chapter
"Mounting" in the appendix of the handbook to mark the six mounting hole locations on the
mounting surface.
• Drill six holes into the mounting surface and insert six screw anchors into them.
• Use screws M4 (3/16") to fix the field terminal box at first.
• Put the flow through assembly on top of the field terminal box and use screws M6 (¼") to fix it.
The design of the device recommends that the field terminal box cradles in a hutch below the
flow through assembly. Therefore the correct procedure is to fix the field terminal box first and
then mount the flow through assembly on top of it.

INSTALLATION 3
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3.4.3 Connecting the hoses
The scope of delivery contains two tubings with fittings (intake tubing, drain tubing) for the
connection between the flow through assembly and the flow intake and flow drain. The intake
tubing has a shut-off clamp and the drain tubing has a backpressure valve. Connect the hoses
according to the following drawing:
The hose for the connection between the sampling point and the device as well as the hose for
the flow drain do not belong to the scope of delivery. For this purpose use hoses with the
following specifications:
•Inner diameter: 4.75 mm or 3/16"
•Outer diameter: 8 mm or 5/16"
•Flexible and opaque hose material to prevent algae growth if direct sunlight can reach the
hose
Do not connect the sensor interconnect cable with the upper part of the device now and regard
the installation order in the chapter "Electrical connections"! The reason is that you will have to
do the internal wiring at first and the connection of the sensor interconnect cable afterwards, the
reverse order could damage the device!
Figure 3-1: Connecting the hoses
1 Intake tubing with shut-off clamp
2 Drain hose with backpressure valve
3 Sensor interconnect cable

3INSTALLATION
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Assemble the plumbing and connect the hoses according to the following drawing:
3.4.4 Drain vent
The device has a drain vent in the "Out" bulkhead fitting. The drain vent allows atmospheric
equalization, thus helping to alleviate bubble formation in the cuvette.
In some pressurized systems there may occur a continuous leakage at the drain vent hole.
Therefore the scope of delivery contains a seal screw that you can insert into the vent hole and
tighten.
Figure 3-2: Procedure to assemble the plumbing and connect the hoses
To prevent that the drain water causes any damages, assure that the drain hose leads to a
suitable drain site.
The manufacturer accepts no responsibility for damage caused by the introduction of vapours,
fluids or other materials into the device process stream which are not compatible with the
device
’ s wetted materials. Always note the list of wetted parts in the technical data table before
introducing any media into the device process stream!
During initial flow minor leakage may occur at the drain vent. This will subside once the normal
flow is established.

INSTALLATION 3
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3.4.5 Inserting and fixing the flow through unit
Never insert a cuvette with visible moisture or water on the glass or the transducer into the
upper part of the device, because this could destroy or damage the electronics or the
transducer! Always clean and dry the cuvette with a soft cloth just before inserting it. The
dehumidification system cannot remove large droplets of water, only residual moisture!
Figure 3-3: Procedure for inserting and fixing the flow through unit
The device can only detect a new cuvette if it works in the normal operation mode ("AUTO"). If the
device operates correctly after inserting a new cuvette, "AUTO" will flash on the display.

4ELECTRICAL CONNECTIONS
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4.1 Safety instructions
4.2 Description of board and bulkheads
All of the electrical connections to the device run via the field terminal box. For shipment the
manufacturer inserts plugs into the alarm and the 4...20 mA / RS 485 cable bulkhead to
waterproof the device.
All work on the electrical connections may only be carried out with the power disconnected. Take
note of the voltage data on the nameplate!
Observe the national regulations for electrical installations!
Observe without fail the local occupational health and safety regulations. Any work done on the
electrical components of the measuring device may only be carried out by properly trained
specialists.
Look at the device nameplate to ensure that the device is delivered according to your order.
Check for the correct supply voltage printed on the nameplate.
Figure 4-1: Description of board and bulkheads
1 Power supply terminal block
2 Alarms relay
3 4...20 mA / RS 485 terminal block
4 Power cable strain relief
5 4...20 mA / RS 485 cable bulkhead with liquid tight plug
6 Alarm cable bulkhead with liquid tight plug
7 Power cable bulkhead
8 Holes for strain relief strap
9 Sensor interconnect cable

ELECTRICAL CONNECTIONS 4
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4.3 Circuit breaker and specifications of power supply
4.4 Cable specifications
•The power cable bulkheads accept the following cable diameter range: 5.8...10 mm /
0.23...0.39".
•All terminals accept wires in the range of 14...28 AWG.
•Stripping of insulation to a length of 6 mm / ¼".
4.5 Installation order of the electrical connections
To establish the electrical connections in the correct way, follow the order of the following
sections and their instructions.
The manufacturer strongly recommends to place a circuit breaker prior to the power
connection. Use this circuit breaker to de-energise all cables before starting any installation or
service work, otherwise a perilous electric shock can happen.
The device has a switching power supply which demands 100...240 VAC and 47...63 Hz. To avoid
damage or destruction of the device always assure that the power supply meets this
specifications!
The power cord does not belong to the scope of delivery.
Installation, assembly, start-up and maintenance may only be performed by appropriately
trained personnel. The regional occupational health and safety directives must always be
observed.
To prevent damage or destruction of all devices, always regard the following items:
• Ensure that the meter itself and all devices that should be connected to the outputs are de-
energised before establishing a cable connection!
• Before fixing a cable, look an the labels on the board and especially regard polarities!

4ELECTRICAL CONNECTIONS
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4.5.1 Connecting the cables in the field terminal box
Connection procedure
• Open the terminal box with a screwdriver.
• Remove the plugs in the cable bulkheads if you want to conduct a cable through them.
• Strip all wires to a length of 6 mm / ¼".
• Fix the cable on the terminal like in the following drawing (1to 5).
• Use the strain relief strap to reduce the tension on the power terminals (6).
• Close the terminal box and assure that it is properly sealed.
The device involves a line voltage that could endanger life! Only qualified electricians are allowed
to perform the electrical installation of the device. Always note all local and government
recommendations and methods for installation of electrical connections to and between the
device and other peripheral devices.
The manufacturer accepts no responsibility that the device is watertight again after the electrical
installation. Assure the water tightness after the terminal box was wired for operation. If any of
the bulkheads does not tighten a cable or plug properly this jeopardizes the ratings of the device
and may cause a perilous electric shock.

ELECTRICAL CONNECTIONS 4
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4.5.2 Alarms terminal (signal output)
The terminals "ALARM 1" and "ALARM 2" are mechanical relays rated at 240 VAC and 2 A. The
abbreviations on the board and below the terminal have the following meanings:
•NO: Normally open
•NC: Normally closed
•C: Common
As the configuration of the alarms is fail-safe, the normal state is a power supplied device and
non-active alarms.
4.5.3 4...20 mA or RS 485 signal output
The 4...20 mA output is energised by a 15 VDC power source and can drive recorder loads up to
600 Ω. It is isolated from line power and earth ground.
The RS 485 half-duplex digital interface (2-wire) operates with differential levels that are
unsusceptible to electrical interferences. This is why the usage of cable lengths up to 900 m /
2950 ft is possible. Independent of the output mode (analogue or digital) always note the
following items:
•For ease of connecting, remove the plug in terminal block (the labels of the connections are
beneath this block).
•Do not run 4...20 mA or RS 485 cables in the same conduit as power as this could lead to
signal interferences.
•When using the RS 485 interface, equip the last device on each bus with a 120 Ωterminating
resistor to eliminate signal reflection on the line.
The installation of the 4...20 mA isolator will render the RS-485 non-operational. Shifting
between the 4...20 mA (analogue) and the RS-485 (digital) output mode works with the help of the
software.
Transformer isolated outputs are available as a factory installed option.

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The electrical connection is independent of the output mode (analogue or digital) and works as
follows:
4.5.4 Connecting the sensor interconnect cable
RS485/4...20 mA
Always connect the sensor interconnect cable with the upper part of the device last of all! The
reason is that if you connect the sensor interconnect cable before the internal wiring, energising
the device with power could destroy or damage the device!