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VisiWater™ DO
Sensors
Operating Instructions
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TABLE OF CONTENTS
Table of Contents
TABLE OF CONTENTS
1 General Information ................................................ 4
1.1 Intended Use ................................................................. 4
1.2 About this Operating Instruction .................................. 4
2 Liability .. ................................................................... 4
3 Safety Precautions and Hazards ........................... 5
3.1 General Precautions .................................................... 5
3.2 Operation of VisiWater DO Sensor .............................. 5
3.3 Earthing ....................................................................... 6
3.4 Electrical Safety Precautions ....................................... 8
3.5 Chemical, Radioactive or Biological
Hazard Precautions ..................................................... 9
4 Product Description ................................................ 9
4.1 General Description ..................................................... 9
4.2 Hardware Description ................................................ 10
4.3 Optical DO measurement .......................................... 11
4.4 VisiWater DO sensor with
Micro-Transmitter inside ............................................ 11
5 Installation .............................................................. 12
5.1 Unpacking ................................................................. 12
5.2 Configure the VisiWater DO sensor with
Hamilton Device Manager (HDM) .............................. 12
5.2.1 Installing the Hamilton Device Manager .......... 12
5.2.2 Installing DTMs ................................................ 13
5.2.3 Connecting a VisiWater DO
Sensor to HDM ............................................... 13
5.2.4 Setting User Level ........................................... 13
5.2.5 Configuring the VisiWater DO
Sensor Parameters .......................................... 14
5.2.6 Configuring the calibration settings ................. 15
5.2.7 Configuring the temperature settings ............ 15
5.2.8 Configuring the analog interface for
your process control system ........................... 16
5.2.9 Defining a measuring point name for
identification of the process ............................ 16
5.3 Install VisiWater DO sensor in
your Measuring Loop ................................................. 16
5.3.1 Mechanical Process Connection .................... 16
5.3.2 Cable Pin Designation ..................................... 17
5.3.3 Controlling 4–20 mA current interface
signals by pulse-width modulation .................. 17
5.3.4 Electrical Connection for Analog
4–20 mA Connection ...................................... 19
5.3.5 Electrical connection for the
digital RS485 interface .................................... 20
6 Operation .............................................................. 22
7 Maintenance ......................................................... 22
7.1 Verify Sensor Status and ODO Cap Functionality ...... 22
7.2 Replacing the ODO Cap ............................................ 23
7.3 Calibration .................................................................. 23
7.3.1 Automatic Standard Calibration with HDM ..... 24
7.3.2 Zero Point Calibration (Point Zero Oxygen) ..... 24
7.3.3 Calibration in Air (Calibration Point Air) ............ 25
7.4 Product calibration .................................................... 25
8 Troubleshooting ..................................................... 27
8.1 Sensor Self-Diagnostic .............................................. 27
8.1.1 W a r n i n gs ......................................................... 27
8.1.2 Errors .............................................................. 28
8.2 Getting Technical Support ......................................... 29
8.3 Returning VisiWater DO sensor for Repair ................. 29
9 Disposal ................................................................ 29
10 Technical Specifications ...................................... 30
11 Ordering Information ............................................. 31
11.1 VisiWater DO sensor ................................................. 31
11.2 Parts and Accessories .............................................. 31
11.3 Services .................................................................... 32
Hamilton Warranty
Please refer to the General Terms of Sales (GTS).
Important note
Copyright © 2016 Hamilton Bonaduz AG, Bonaduz
Switzerland. All rights reserved. The reproduction of any
part of this document in any form is forbidden without the
express written agreement of Hamilton Bonaduz AG.
Contents of this manual can be modified without previous
announcement. Technical modifications reserved. Greatest
possible care was used on the correctness of the
information in this manual. If errors should be discovered
nevertheless, Hamilton Bonaduz AG is pleased to be informed about it. Regardless of this, Hamilton Bonaduz AG
cannot assume liability for any errors in this manual or for
their consequences.
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3Operating Instructions VisiWater
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GENERAL INFORMATION • LIABILITY SAFETY PRECAUTIONS AND HAZARDS
1 General Information
1.1 Intended Use
The VisiWater DO sensors are intended for the measurement of
dissolved oxygen (DO) in water application.
ATTENTION! VisiWater DO sensor is not intended
for hazardous atmospheres.
The VisiWater DO sensor has a built-in temperature sensor
(NTC 22 kOhm). This temperature sensor is to be used only for
monitoring the sensor conditions, not for controlling the process
temperature.
1.2 About this Operating Instruction
These Operating Instructions are designed to support the integration, operation and qualification of the VisiWater DO sensors.
To achieve this, it will describe the features of VisiWater DO sensor and its integration in Process Control Systems (PCS). Both
the hardware and the communication between the VisiWater DO
sensor and Process Control Systems are detailed in this manual.
After reading this manual the user should be capable of installing
and operating VisiWater DO sensors.
NOTE: The VisiWater DO sensor is not intended and
specified as a safety device. A SIL (Safety Integrity Level)
certification is not available. It is in the sole responsibility
of the user to validate the VisiWater DO sensor according
the safety requirements of his application.
3 Safety Precautions
and Hazards
ATTENTION! Read the following safety instructions carefully before installing and operating the
VisiWater DO sensor.
3.1 General Precautions
For safe and correct use of VisiWater DO sensor, it is essential
that both operating and service personnel follow generally accepted safety procedures as well as the safety instructions given
in this document, the VisiWater DO sensor operation instruction
manual.
The specification given in chapter 10 as regards temperature,
pressure etc. may under no circumstances be exceeded. Inappropriate use or misuse can be dangerous.
ATTENTION! Essential information for avoiding
personal injury or damage to equipment.
NOTE: Important instructions or interesting information.
2 Liability
The liability of Hamilton Bonaduz AG is detailed in the document
“General Terms and Conditions of Sale and Delivery”.
Hamilton is expressly not liable for direct or indirect losses arising
from use of the sensors. It must in particular be insured in this conjunction that malfunctions can occur on account of the inherently
limited useful life of sensors contingent upon their relevant applications. The user is responsible for the calibration, maintenance and
regular replacement of the sensors. In the case of critical sensor applications, Hamilton recommends using back-up measuring points
in order to avoid consequential damages. The user is responsible
for taking suitable precautions in the event of a sensor failure.
Cleaning, assembly and maintenance should be performed by personnel trained in such work. Before removing the sensor from the
measuring setup, always make sure the no process medium can
be accidentally spilled. When removing and cleaning the sensor, it
is recommended to wear safety goggles and protective gloves.
The sensor can not be repaired by the operator and has to be
sent back to Hamilton for inspection.
Necessary precautions should be taken when transporting the
sensors. For repair or shipment the sensor should be sent back in
the original reusable packaging box. Every VisiWater DO sensor
sent back for repair must be decontaminated.
If the conditions described in these operating instructions manual
are not adhered to or if there is any inappropriate interference
with the equipment, all of our manufacturer’s warranties become
obsolete.
3.2 Operation of VisiWater DO Sensor
VisiWater DO sensors must be used for their intended applications,
and in optimum safety and operational conditions. The specifications (such as temperature or pressure) defined in the section
entitled ‘Technical Specification’ must not be exceeded under any
circumstances (Chapter 10).
Make sure that the PG13,5 thread and the O-ring are not damaged when screwing the sensor into the process. O-rings are
consumable parts which must be exchanged regularly (at least
once per year). Even when all required safety measures have
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5Operating Instructions VisiWater
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SAFETY PRECAUTIONS AND HAZARDS SAFETY PRECAUTIONS AND HAZARDS
been complied with, potential risks still exist with respect to leaks
or mechanical damage to the armature. Wherever there are seals
or screws, gases or liquids may leak out undetected. Always
make sure that no process medium can be accidentally spilled
before removing the sensor from its measurement setup. Do not
put stress on the system by vibration, bending or torsion.
Before use, verify that the sensor is properly configured for your
application.
ATTENTION! When unscrewing the PG13,5 thread
connection never turn the sensor at the sensor head
because you can loosen the ODO Cap from the sensor
shaft and fluid can reach the interior of the sensor.
ATTENTION! To avoid humidity problems, make
sure that the ODO Cap is always attached firmly to the
sensor shaft, and that the O-ring between the shaft
and cap is undamaged.
Make sure that following cross sensitivities and resistances of
ODO Caps are respected.
Option 1: The Metal tank is connected to earth
The sensor shaft is connected to the metal tank over the PG13,5
thread
Green/Yellow Cable
Cross sensitivities and resistances of ODO Cap H0
Measurement not influenced by Carbon Dioxide
Wetted parts resistant to Ethanol
Wetted parts not resistant to Chlorine, Ozone and Organic
Solvents such as Acetone,
Tetrahydrofuran (THF*)
Cross sensitivities and resistances of ODO Cap H2
Measurement not influenced by Carbon Dioxide, lipophilic
compounds
Wetted parts resistant to Organic Solvents such as
Ethanol*, Acetone*, (THF*),
Heptan*, Dimethylformamide*
Wetted parts not resistant to Chlorine and Ozone Gases
*Tested for 30 min at 25°C
3.3 Earthing
The sensor has to be mounted at the mounting location electrostatically conductive (< 1MOhm). It is recommended to assign
the sensor shaft to earth (PE potential equalization) especially
in electromagnetically noisy environments. This significantly
improves noise immunity and signal quality. The PG13,5 thread
is connected to the metallic housing of the VisiWater DO sensor.
Two options for connecting the sensor to the process environment are available.
Figure 1: Metal tank with earth connection
NOTE: If the tank is not connected to earth, Option 2
has to be applied.
Option 2: Glass or plastic tank
(not connected to earth)
The glass or plastic tank has no connection to earth and
therefore it is necessary to connect the sensor shaft via a
screw clamp to earth.
Green/Yellow Cable
Figure 2: Glass or plastic tank without earth conne ction
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SAFETY PRECAUTIONS AND HAZARDS PRODUCT DESCRIPTION
Below several examples how to connect the shaft of the sensor
directly to earth as required in Figure 2 are shown.
External earth cable
ATTENTION! Switch off the power supply and
unplug the connector before dismounting the
VisiWater DO sensor.
3.5 Chemical, Radioactive or Biological
Hazard Precautions
Selection of the appropriate safety level and implementation of
the required safety measures for working with VisiWater DO
sensor is the sole responsibility of the user.
If working with hazardous liquids observe and carry out the maintenance procedures, paying particular attention to cleaning and
decontamination. If VisiWater DO sensor becomes contaminated
with biohazardous, radioactive or chemical material, it should
be cleaned. Failure to observe and carry out the maintenance
procedures may impair the reliability and correct functioning of
the measuring module.
Figure 3: Example clamps for conne cting the earth
to armature and metallic housing of the tank.
3.4 Electrical Safety Precautions
Do not connect the sensor to a power source of any voltage
beyond the range stated in the power rating Technical Specifications (Chapter 10).
Make sure the cable is intact and properly plugged to avoid any
short circuit.
Keep VisiWater DO sensor away from other equipment which
emits electromagnetic radio frequency fields, and minimize static
electricity in the immediate environment of the optical measuring
parts. Carefully follow all the instructions in chapter 5.3 to avoid
electrical damage to the sensor. The contacts must be clean
and dry before sensor is connected to the cable.
4 Product Description
4.1 General Description
Hamilton’s optical sensor has been the first optical dissolved
oxygen (DO) sensor for process measurement. With their micro
transmitter, VisiWater DO sensors enable direct communication
to the process control system via 4–20 mA standard signal or
digital Modbus.
VisiWater DO sensor optical technology improves the measuring
performance and simplifies maintenance. Improvements compared to conventional electrochemical (amperometric) sensors
include flow independence, rapid start-up with no polarization
time, and simplified maintenance.
With the transmitter integrated, VisiWater DO sensors provide
more reliable measurements directly to your process control
system. The µ-transmitter located in the sensor head stores all
relevant sensor data, including calibration and diagnostic information, simplifying calibration and maintenance.
Key benefits include:
• Optical measurement
• No separate transmitter needed
• Simple maintenance with robust industrial design
• Easy to install
• Direct analog or digital Modbus communication to the
process control system via 4–20 mA standard signal.
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PRODUCT DESCRIPTION PRODUCT DESCRIPTION
4.2 Hardware Description
The VisiWater DO sensor consists of a sensor head with integrated electronic and a sensor shaft in contact with the measured
medium. The sensor shaft is terminated by the optical dissolved
oxygen (ODO) cap, carrying the oxygen sensitive luminophore.
During development, special attention was paid to an optimum
sanitary design. All materials in contact with the solution meet the
FDA requirement.
Fix cable
Sensor Head with
micro transmitter
4.3 Optical DO measurement
The optical measurement principle is based on the so-called
luminescence quenching. The luminescence of certain organic
pigments (luminophore) is quenched in the presence of oxygen.
The luminophore absorbs the excitation light and release a part of
the absorbed energy by emission of fluorescence. In the presence of oxygen, energy transfer takes place from the excited
luminophore to oxygen. The luminophore does not emit fluorecence and the measurable fluorescence signal decreases.
1
Fluorescence process (without oxygen)
Light (excitation)
Luminophore
Light Absorption Excited State
2
Quenching in the presence of oxygen
Fluorescence
(emission)
Process connection
PG13,5 stainless steel
O-ring
Sensor shaft with
stainless steel
Energy transfer
O
2
No fluorescence
Light Absorption Excited State
Figure 5: Fluorescence quenching by oxyge n
O
2
4.4 VisiWater DO sensor with
Micro-Transmitter inside
With the micro-transmitter integrated, VisiWater DO sensors offer
fully compensated signal directly to the process control system.
Communication protocols include standard analog 4–20 mA. The
micro transmitter located in the sensor head stores all relevant
sensor data, including calibration and diagnostic information,
simplifying calibration and maintenance.
ODO Cap with oxyge n-sensitive
luminophore (sensory element), ODO
Cap serial number, reference number
and stainless steel heat number
Figure 4: VisiWater DO sensor hardware description.
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11Operating Instructions VisiWater
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INSTALLATIONINSTALLATION
5 Installation
5.1 Unpacking
1) Unpack carefully the VisiWater DO sensor. Enclosed you will
find the VisiWater DO sensor, the Declaration of Quality, the
VisiWater DO sensor Instruction Manual, and the Stainless
Steel material Certificate.
2) Inspect the sensor for shipping damages or missing parts.
5.2 Configuring the VisiWater DO sensor
with Hamilton Device Manager (HDM)
Two pieces of software are required to configure and set up the
VisiWater DO sensor. The Hamilton Device Manager (HDM) software is required as frame application based on FDT (Field Device
Tool). The Device Type Manager (DTM) file is required to configure
and manage all VisiWater DO sensors in HDM. To configure the
VisiWater DO sensor you will need a USB RS485 Modbus Converter and power supply.
5.2.2 Installing DTMs
1) Download the Zip File «Arc Sensor DTM Setup»
from the Hamilton webpage www.hamiltoncompany.com
(search for Hamilton DTMs).
2) Unpack the downloaded ZIP-File.
3) Do not plug the USB RS485 Modbus Converter before the
installation of the DTM is completed.
4) Install the DTM and follow the instructions on the screen.
5) Plug your USB RS485 Modbus Converter to the USB-port
of your computer. The driver installs automatically under
Windows
the drivers saved on the computer under Windows
®
7. Use the “Found new Hardware” Wizard to install
®
X P.
5.2.3 Connecting a VisiWater DO Sensor to HDM
1) Connect the sensor to an external power supply.
2) Start HDM.
3) Open “Device Catalogue” in View.
4) Update the DTM Device Catalogue by clicking “update”.
5) Add the selected “Modbus Serial Port”. Right click on
“My network” and select “Add” for the Device Type.
USB RS485 Modbus Converter VisiWater DO
HDM
Figure 7: VisiWater DO sensor configuration with HDM
Power Supply
5.2.1 Installing the Hamilton Device Manager
1) Download the ZIP file “Hamilton Device Manager” from
the Hamilton webpage www.hamiltoncompany.com
(search for Hamilton Device Manager).
2) Unpack the downloaded ZIP-File.
3) Install the “Hamilton Device Manager” by double clicking
“setup.exe” and follow the instructions on the screen.
6) The Modbus Serial Port is added to the “My network” list.
7) Double click on the “Modbus Serial Port”. Set the
appropriate COM Port and validate with “Apply”.
8) “Scan for devices”. The available sensors appear on the
N etwo rk View.
9) Select the desired sensor. Right click and select “GO online”.
The sensor is online if it shows in bold font and offline if it
shows in normal font.
Figure 8:
VisiWater
DO Sensor
connected
to the HDM
(symbolic
figure)
5.2.4 Setting User Level
1) Select the desired sensor and check it is online.
If not “Go online” with right click on the sensor.
2) Double click on the bold sensor name.
3) Set the appropriate operator level and press “Apply”.
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INSTALLATION INSTALLATION
Parameter Default
Name Description password Configuration Location
User The Users Not required Not required System
[U] can only read
basic data
from sensor
Administrator The Admini- 18111978 Not required System
[A] strators can
also calibrate
sensor s
Specialist Additionally 16021966 Must System
[S] the specialist
can configure
the sensors.
Figure 9: User levels
5.2.5 Configuring the VisiWater DO
Sensor Parameters
1) Select the desired sensor and check it is online.
If not “Go online” with right click.
2) Double click on the bold sensor name.
3) Set operator level to “S” and press “Apply” (Chapter 5.2.4).
4) Configure the measurement parameters.
Parameter Default
Name Description Value Configuration Location
Sensing Sensing 243515 Must Measurement/
Material Material are application Parameter
different types dependent
of ODO Cap
which can be set
by entering the
Ref number of
the ODO Caps
5.2.6 Configuring the calibration settings
Parameter Default
Name Description Value Configuration Location
Drift DO Higher drift 0.05%/min Recommend Calibration/
will interrupt default Calibration
the calibration parameter Settings
process.
Warning
comes up
“drift ox ygen”
Drift T Higher drift 0.5 K/min Recommend Calibration/
will interrupt default Calibration
the calibration parameter Settings
process. War ning comes
up “drift
temperature”
Parameter Default
Name Description Value Configuration Location
DO Unit These are the %vol. Required
measurement Values
physical units
%vol., %sat.,
ug/l ppb,
mg/l ppm, mbar
T unit These are the °C Required Measurement/
temperature Values
physical units
K, °F, °C
Salinity The concentra- 0 mS/cm Default Measurement/
tion of dissolve parameter Parameter
oxygen in recommended
saturated water
is dependent
on the salinit y
Air The partial 1013 mbar Required, Measurement/
pressure pressure of application Parameter
oxygen is dependent
proportional to
the atmospheric
pressure or the
pressure of the
air supply to
the process
Measuring The measuring 3 sec.
Interval interval can be default Parameter
set between parameter
1 sec. and
300 sec. The
LED flashes
once in the set
measure interval
Moving The sensor 0 (auto)
average uses a moving default Parameter
average over parameter
the measuring
points
Recommended
Recommended
Measurement
Measurement/
Measurement/
/
5.2.7 Configuring the temperature settings
Parameter Default
Name Description Value Configuration Location
Customer User defines 0°C to 60°C Recommend Status/
temperature temperature default Quality,
range range for DO parameter Counters
reading. No and
DO reading Tempe-
above 60°C ratures
possible
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INSTALLATION INSTALLATION
5.2.8 Configuring the analog interface for
your process control system
Parameter Default
Name Description Value Configuration Location
Interface The output of 4 –20 mA Recommended Interface/
Mode the 4-20 mA default Analog
can be
configure linear,
bilinear or with
a fix value
Value at Defined 0%-vol Must Interface/
4 mA measurement application Analog
value for 4 m A dependent Output
output
Value at Defined 62.85-%vol Must Interface/
20 mA measurement application Analog
value for dependent Output
20 mA output
Mode in Current output No output Recommended Interface/
event of mode in case default Analog
warning of warnings parameter Output
Mode in Current output Continuous Recommended Interface/
event of mode in case output default Analog
errors of errors parameter Output
Output in Current output 3.5 mA Recommended Interface/
event of in case of default Analog
warning warnings parameter Output
Output in Current output 3.5 mA Recommended Interface/
event of in case of default Analog
error error parameter Output
Output for T Current output 3.5 mA Recommended Interface/
out of limit in case of default Analog
temperature parameter Output
out of limit
Before installing the armatures, you should test that the seal is
tight and the parts are all in working order. Ensure that there is no
damage to the sensor or the armature. Check whether all O-rings
are in place in the appropriate grooves and are free of damage.
To avoid any mechanical damage to O-rings on assembly, they
should be slightly greased.
Please note that O-rings are wetted parts and greasy compounds
must comply to your FDA application needs.
5.3.2 Cable Pin Designation
1
2
3
4
Shield
5
5.2.9 Defining a measuring point name for
identification of the process
Parameter Default
Name Value Settings Location Descriptions
Measuring User can 243650 – 1234 Optional Information /
point define a Info
sensor name Userspace
for better
identification
of the mea suring point
5.3 Install VisiWater DO sensor in your
Measuring Loop
5.3.1 Mechanical Process Connection
The VisiWater DO sensor mechanical design is compatible
with all Hamilton process housings, including FlexiFit, Retractex,
RetractoFit and Hygienic Sockets.
Figure 11: Requirements for electrical connection of VisiWate r DO sensors
Pin Color Function
1 White - 4-20 mA Interface # 1
2 Brown Power Supply: + 24 VDC (7 to 30 V)
Start-up power: 1 W Continuous power
consumption: 600 mW
3 Green GND
4 Yellow RS485 (A)
5 Gray RS485 (B)
Shield Green-Yellow not connected
5.3.3 Controlling 4–20 mA current interface
signals by pulse-width modulation
Hamilton VisiWater DO sensors use the method of pulse-width
modulation (PWM) to adjust the DC currents of the 4–20 mA
interfaces corresponding to the measured values. In principle, the
pulse width (ti) of a rectangular signal with a constant frequency,
the pulse duty factor (ti/T), is modulated and afterwards de-
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17Operating Instructions VisiWater
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INSTALLATION INSTALLATION
modulated by a low-pass filter to generate continuous analog
DC signals. The resulting value yi corresponds to the average of
the PWM signal (see Figures 12 and 13). The PWM-loads of the
Sensors have low-pass filters which are not able to eliminate all
AC fractions of the used PWM frequency of 5 kHz due to technical impossibilities. Therefore, the current signals of the 4–20 mA
interfaces are still overlaid by a certain AC which should be
masked by lag smearing or input filters of the current input card of
the process control system (PCS). Recommended PCS settings
are a sampling rate below 3.5 kHz, an averaging over more than
1 s, and the use of galvanically separated inputs to avoid oscillations. It is also possible to use mathematical functions or isolating
amplifiers for signal processing filtering if necessary. For detailed
technical advice about suitable isolating amplifiers, please contact
Hamilton technical support.
Analog interface 1 and 2
Galvanically not isolated, pulse width modulation with 5 kHz,
recommended PCS settings:
• Use galvanically separated inputs
• Sampling rate < 3 kHz and ≠ n * 5 kHz
• Average over > 1 s
5.3.4 Electrical Connection for Analog
4–20 mA Connection
The 4–20 mA interface enables direct connection of the VisiWater DO sensor to a data recorder, indicator, control unit or PCS
with analog I/O. The VisiWater DO sensor works as a current
sink sensor and is passive. Connect the sensor according to the
pin designations (Chapter 5.3.2). The 4–20 mA interface of the
VisiWater DO sensors is pre-configured with default values for the
4–20 mA range, and measurement unit. Configure the 4–20 mA
interface according to your requirements for proper measurement
(Chapter 5.2.8).
Examples of circuit arrangement
Figure 12: Progress of a rectangular signal with a period T and a pulse
duration t
Figure 13: Progre ss of a rectangular signal with a period T and a pulse duration t2
for the generation of an analog signal with the value y
for the generation of an analog signal with the value y1.
1
.
2
ATTENTION! The VisiWater DO sensor generates
the 4-20 mA signals by pulse with modulation (PWM)
which is not compatible to all PCS systems. Also a
galvanic separation between the power supply and
the PCS is necessary for correct sensor functionality
when used in 4-20 mA setups. Figure 12 illustrates a
solution for the problem.
Sensor
4–20 mA c urrent
White
Brown
Green
-
input
+
Brown
Green
+
-
output
Pin 1
4–20 mA
regulation
Sensor power
Pin 2
U (7–30 VDC) Po wer Supp ly Sens or
Pin 3
Figure 14: Three-wire loop wiring diagram for the 4 –20 mA interface.
Sensor
Pin 1
4–20 mA
regulation
Sensor power
Pin 2
Pin 3
Figure 15: The safest form of wiring, using an ex ternal isolation amplifier.
The figure represents 4–20 mA interface. (For detailed technic al advice, please
contact the technical support at Hamilton.)
White
4–20 mA c urrent
U (7–30 VDC) Po wer Supp ly Sens or
PCS
0 VDC; GND
-
u
+
+ 24 VDC
0 VDC; GND
PCS
+
u
-
0 VDC; GND
+ 24 VDC
0 VDC; GND
Analog Input
Analog Input
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INSTALLATION INSTALLATION
5.3.5 Electrical connection for the
digital RS485 interface
The digital RS485 interface enables communication with
VisiWater DO sensor for performing measurements, for calibrating the sensor and for changing the sensor’s configuration
parameters. VisiWater DO sensor are always connected to digital
controlling devices as a Modbus slave. To function, they require
a power supply (Pin 2 and 3, see below). The section entitled
“Configuring the VisiWater DO sensor parameters” describes
operation in digital mode.
Additional information:
The Modbus RTU communication protocol corresponds to the
Modbus-IDA standard (see www.modbus.org). VisiWater DO sensor uses an open register set developed by Hamilton. Additional
information about the register content and structure can be found
in the programmers manual under www.hamiltoncompany.com
The Modbus physical layer is described in detail with requirements on cabling and line termination in the “Modbus Serial
>
line Protocol and Implementation Guide” www.modbus.org
Technical Resources / Modbus Specifications / Modbus Serial
line Protocol and Implementation Guide.
Example of circuit arrangement
Sensor
Pin 2
Pin 3
Pin 4
Pin 5
Figure 17: Wiring diagram for the RS485 inte rface.
Master device Distributors
SDA(-)
SDB(+)
RDA(-)
RDB(+)
+ 24 VDC
Common
120 Ohm
line termination
(option)
#1
A/A'
B/B'
+ 24 VDC
Common
#2
A/A'
B/B'
+ 24 VDC
Common
#3
A/A'
B/B'
+ 24 VDC
Common
Power supply
+24 VDC
+
-
0 VDC; G roun d
PCS
A
RS 485
B
Ground
#n
n≤31
A/A'
B/B'
+ 24 VDC
Common
120 Ohm
line termination
(option)
ATTENTION! Because all sensors are delivered
with factor y-default settings, each sensor must be
configured for its specific application before first use
(see the section entitled “Configuring VisiWater DO
sensor”).
The pins for digital the RS485 interface have the following
designation with respect to cable conductor colors:
Sensor fix cable Color
Power supply: +24 VDC Brown
(7 to 30 VDC), max. power
consumption 1 W.
Power supply: Ground Green
RS485 (A) Yellow
RS485 (B) Gray
Cable shield green-yellow
Figure 18: Multi-drop bus wiring for the Modbus two-wire mode.
Each sensor functions as a Modbus slave.
The serial Modbus connection between the RS485 port of the
master and the corresponding interfaces of the sensors has to
be ensured according to the EIA/TIA RS485 standard. Only one
sensor can communicate with the master at any time.
NOTE: In order to avoid signal reflection on the lines the
use of line termination resistors (120 Ohm each) is recommended. The effect of signal reflections becomes more
relevant with long cable length and/or high baud rates.
NOTE: In the connection scheme shown above, each
sensor must have the unique Modbus device address for
proper communication.
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21Operating Instructions VisiWater
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OPERATION • MAINTENANCE MAINTENANCE
6 Operation
WARNING: Only use the sensor within the specifications
(Chapter 10). Failure to do so may lead to damages or measure-
ment failure.
1) Remove the protective caps from the VisiWater DO sensor shaft
2) Check the O-ring on the sensor shaft and verify if the ODO
Cap is screwed firmly to the sensor shaft (Chapter 7.2)
3) Verify if the sensing material is correct for the ODO Cap type
which can be set by entering the Ref number of the ODO Caps
4) Verify the functionality of the sensor including the ODO
cap (Chapter 7.1)
5) Calibrate the sensor (Chapter 7.3)
6) Connect the sensor to the process control system (Chapter 5.3)
7) Verify the measurement in air on your control system
8) Mount the sensor to the armature or process connection
(Chapter 5.3)
NOTE: No oxygen measurement is performed at a
temperature higher than 60°C to protect the optoelec-
tronics and enhanced the sensor lifetime.
4) Control the quality of the ODO cap in Sensor Status /
Quality Counter and Temperature / Quality Indicator and
change the ODO cap if required (Chapter 7.2).
The sensor is performing correctly.
No errors or warnings have been registered.
At least an error or a warning has been registered.
Verify the sensor errors and warnings in Sensor Status.
No communication between the sensor and the HDM.
This may be due to a hardware failure.
Figure 19: Description of the traffic lights on the HDM
7.2 Replacing the ODO Cap
The exchange of ODO Cap can be performed very easily:
1) Unscrew the ODO cap from the shaft (Figure 20).
2) Exchange the O-ring.
NOTE: To ensure a correct measurement by changing
a ODO Cap type e.g. ODO Cap H0
reference number of the ODO Cap should be configured
in the Sensing Material register (See chapter “Configuring
the VisiWater DO Sensor Parameters”. Firmware version
ODOUM042.hex ore higher is required.
>
ODO Cap H2 the
7 Maintenance
Periodic maintenance routines need to be run in order to
ensure safe and reliable operation and measurement of sensor
and the accessories.
ATTENTION! Avoid any contact of the equipment
with corrosive media.
3) Screw firmly the new ODO Cap onto the sensor shaft again.
4) Perform sensor calibration (Chapter 7.3).
NOTE: If the ODO Cap is mounted very firmly on the
shaft, and if you cannot obtain a good grip on the
stainless steel with your fingers, a silicone tube between
your fingers and metal may supply a better grip.
O-ring
unscrew
Figure 20: Replacing the ODO Cap
7.1 Verify Sensor Status and
ODO Cap Functionality
1) Power the sensor and connect the sensor to HDM.
2) Control the traffic lights (Figure 15).
3) Please refer to the troubleshooting (Chapter 8) for the
next steps if the traffic light is not green.
7.3 Calibration
The VisiWater DO sensors provide two kinds of sensor calibra-
tion: automatic standard calibration, and product calibration.
The automatic standard calibration and the product calibration
may be performed using HDM (see chapter 5.2)
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23Operating Instructions VisiWater
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MAINTENANCE MAINTENANCE
N
2
7.3.1 Automatic Standard Calibration
with HDM
VisiWater DO sensors are calibrated at two points: in air and in an
oxygen-free environment. During calibration, the sensor controls
automatically the stability of the oxygen and temperature signals.
NOTE: For greater measurement accuracy ensure that
temperature difference between calibration medium and
process medium is minimal.
7.3.2 Zero Point Calibration
(Point Zero Oxygen)
1) Power the sensor and connect it to HDM.
2) Select the sensor to calibrate in “Network View”.
3) Go in System and select “Operator Level”.
4) Log in an appropriate Operator Level
(Administrator or Specialist). More details in chapter 5.2.4.
7.3.3 Calibration in Air (Calibration Point Air)
1) Select the sensor to calibrate in “Network View”.
2) Go in System and select “Operator Level”.
3) Log in an appropriate Operator Level
(Administrator or Specialist). More details in chapter 5.2.
4) Go to “Calibration” and select “Calibration Point Air”.
5) Hold the sensor for at least three minutes under stable
conditions in air over stirred water to account for humidity
(Figure 22).
6) Select the calibration command “Auto” and press “Apply”.
7) Verify the Calibration status in air. It should indicate
“Calibration successful”.
5) Go to Calibration and select “Point Zero Oxygen”.
6) Immerse the sensor into an oxygen-free environment
(Figure 21) for e.g. nitrogen gas with min. purity of 5.0 and
nitrogen flow rate: 0.5 mL/min with 3 to 4 bar pressure
(no overpressure). Let the system equilibrate and ensure
stable conditions for at least three minutes.
7) Select the calibration command “Auto” and press “Apply”.
8) Verify the Calibration status in Zero Oxygen. It should indicate
“Calibration successful”.
Sensor for calibration
in zero oxygen
Tube: on the top open
(no overpressure)
Valve for setting the
flow of 0.5 L/min
O
2
H2O
Magnetic stirrer
Figure 22: Calibration setup
in saturated medium
NOTE: Calibration with air-saturated water is less
accurate due to the slow saturation process of air in water.
NOTE: The value of the saturated oxygen concentration
at different temperatures, different pressures and air
humidity play an important role for the calibration of
dissolved oxygen. VisiWater DO sensor refers to a
concentration in water saturated air and from the factory
settings of atmospheric pressure of 1013 mbar at 25°C.
Nitrogen with
purity of 5.0
Figure 21: Zero point
calibration setup
7.4 Product calibration
The product calibration is an in-process calibration procedure in
order to adjust the measurement to specific process conditions.
Product calibration is an additional calibration procedure to a
standard calibration.
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MAINTENANCE TROUBLESHOOTING
If product calibration is activated, the VisiWater DO sensor calibration curve is calculated from the data of last calibration at point
1 and from the data of the product calibration (Figure 23). In order
to restore the original standard calibration curve, the product calibration can be at any time by selecting on the Product calibration
command “cancel”. A new standard calibration cancels a product
calibration as well.
Figure 23: Ef fect of a product calibration (CP6) on an existing standard calibration
function based on the Zero Point Calibration (CP 1) and the Air Calibration (CIP 2).
8 Troubleshooting
8.1 Sensor Self-Diagnostic
VisiWater DO sensors provide a self-diagnostic functionality to
detect and identify the most common sensor malfunctions.
Both interfaces, analog 4–20 mA or digital Modbus, may provide
warning and error messages. The analog 4–20 mA interface can
be configured according to the NAMUR recommendations to indicate an abnormal event (See Chapter 5.2.8). Use HDM for monitoring the sensor status and for troubleshooting. The following
types of messages are provided by the self-diagnosis function.
NOTE: Errors cannot be ignored and corrective action
is immediately necessary.
NOTE: Warnings can be ignored but the warning will
be displayed continuously until the corrective action is
successfully completed.
NOTE: The product calibration is possible for DO values
in the range of 2 to 55 %-vol (20 – 550 mbar pO
).
2
A product calibration is performed as follows:
1) Connect the sensor to HDM.
2) Select the sensor to calibrate in “Network View”.
3) Go in System and select “Operator Level”.
4) Log in an appropriate Operator Level
(Administrator or Specialist). More details in chapter 5.2.
5) Go to Calibration and select “Calibration Point Product”.
6) Select under product calibration command Initialize and
press Apply.
7) Perform an initial measurement while taking a sample
from the process.
8) Perform a laboratory measurement of the sample at the
same temperature as it was measured in the process.
9) Assign the laboratory value in the HDM to the value of the
Initial measurement (Product value to assign). This new DO
value is accepted and automatically active, if the difference
between initial measurement and laboratory values is not
greater than 20 %-sat units.
10) Verify the Calibration status in product calibration.
It should say active + assigned.
NOTE: Alternatively, the product calibration may be
performed with a field device on side the measuring point.
NOTE: For additional information about the sensor
status and the diagnostics features refer to the sensor
operation instruction manual or the programmer`s manual.
8 .1 .1 W a r n i n g s
Warning Cause / Solution
DO reading below The oxygen reading is too low
lower limit (DO < 0%-sat). Make a new zero-point
calibration (Chapter 7.3.2).
DO reading above The oxygen reading is too high
upper limit (DO > 500 %-sat). Make a new calibration
in oxygen saturated medium. (See
chapter 7.3.3). If not successful, replace
the sensor cap.
DO reading unstable If continuously happening, use a new
cap or check the process regulation.
If the problem still appears, call our
Technical Support.
T reading below The temperature is below the user defined
lower limit measurement temperature range. If the
process temperature is outside this range,
the sensor will not perform DO readings.
T reading above The temperature is above the user
upper limit defined measurement temperature range.
If the process temperature is outside this
range, the sensor will not perform DO
readings.
Measurement The measurement interval is set to 0 or
not running the measurement temperature is out of
the range.
DO calibration Perform a calibration in order to ensure
recommended reliable measurement (Chapter 7.3).
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TROUBLESHOOTING DISPOSAL
8.2 Getting Technical Support
Warning Cause / Solution
DO last calibration The last calibration failed. The sensor is
not successful using the old successful calibration values.
In order to ensure reliable measurement
perform a new calibration (Chapter 7.3).
DO replace Replace the ODO Cap and calibrate the
sensor cap sensor. This warning remains active as
long as the sensor quality is below 35%.
4–20 mA value The measurement value is below the
below 4 mA lower limit of the 4–20 mA interface
output. Reconfigure the 4–20 mA interface
(Chapter 5.2.8).
4–20 mA value The measurement value is above the
above 20 mA upper limit of the 4–20 mA interface
output. Reconfigure the 4–20 mA interface
(Chapter 5.2.8).
4–20 mA current The 4–20 mA interface is not able to
set-point not met regulate the current requested for the
current measurement value according to
your 4–20 mA interface configuration.
Check the 4–20 mA wiring and supply
voltage (Chapter 5.3.4).
Sensor supply The sensor supply voltage is too low for
voltage too low the sensor to operate correctly. Ensure
stable supply voltage within the sensors
specifications.
Sensor supply The sensor supply voltage is too high for
voltage too high sensor to operate correctly. Ensure stable
supply voltage within the sensors
specifications.
If a problem persists even after you have attempted to correct it,
contact Hamilton`s Customer Support: Please refer to the contact
information at the back of this operating instruction.
8.3 Returning VisiWater DO sensor
for Repair
Before returning a VisiWater DO sensor to Hamilton for repair,
contact our Customer Service (see Chapter 8.2) and request a
Returned Goods Authorization (RGA) number.
Do not return a VisiWater DO sensor to Hamilton without an RGA
number. This number assures proper tracking of your sensor.
VisiWater DO sensors that are returned without an RGA number
will be sent back to the customer without being repaired.
Decontaminate the VisiWater DO sensor and remove health hazards, such as radiation, hazardous chemicals, infectious agents
etc. Provide complete description of any hazardous materials that
have been in contact with the sensor.
9 Disposal
8.1. 2 E r ro r s
Errors (failures) Cause / Solution
DO reading failure Sensor cap is missing or the sensor is
broken.
) exceeds Measured partial pressure of oxygen is
DO p(O
2
air pressure higher than the air pressure set by the
operator. Reconfigure the air pressure
parameter (Chapter 5.2.5).
T sensor defective The internal temperature sensor is defect,
please call our Technical Support.
DO sensor The DO sensor cap has been removed.
cap missing Do not immerse the sensor in a
measurement solution. Mount an ODO
Cap and calibrate the sensor prior
measurement (Chapter 6).
Red channel failure Measurement channel failure. Please
call our Technical Support.
Sensor supply The sensor supply voltage is below 6 V.
voltage far too low Please check your power supply.
Sensor supply The sensor supply voltage is above 40 V.
voltage far too high Please check your power supply.
Temperature reading The measured temperature is below the
far below min operation temperature.
Temperature reading The measured temperature is above the
far above ma x operation temperature.
The design of Hamilton sensors optimally considers environmental compatibility. In accordance with
the EC guideline 2002/96/EG Hamilton sensors that
are worn out or no longer required must be sent to
a dedicated collection point for electrical and electronic devices,
alternatively, must be sent to Hamilton for disposal. Sensors must
not be sent to an unsorted waste disposal point.
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29Operating Instructions VisiWater
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TECHNICAL SPECIFICATIONS
ORDERING INFORMATION
10 Technical Specifications
4–20 mA current range 3.5 to 22 mA
Accuracy at 25 °C 1 ± 0.05%-vol
21 ± 0.2%-vol
50 ± 0.5%-vol
100 ± 10%-vol
Analog Interface 1 4–20 mA
Certificate Yes
Configurable Values DO: mbar; %-sat; %-vol; μg/l;
mg/l; ppb/ppm (dissolved
oxygen); Temperature: °C
Diameter 12 mm
Digital Interface RS485 Modbus
Drift at Room Temp.
under Constant Conditions < 1% per week
Electrical Connector Fix cable with open end wires
Electrolyte None
Measurement Principle Oxygen dependent
luminescence quenching
Measuring Range 4 ppb to 40 ppm (DO) or
0.1 to 1000 mbar (pO
Wetted parts Stainless steel 1.4435,
Silicone
Process Temperature 0 – 60 °C
Operating Voltage 7 to 30 VDC
Oxygen Consumption None
Pressure Range 0 to 12 bar
Process Connection PG13,5
Stainless Steel 1.4435
Protection Rating IP 68
Response Time t98% < 30 s at 25°C, from air
to nitrogen
Serial Number Yes
Temperature Sensor NTC 22 kOhm
)
2
11 Ordering Information
Parts below may only be replaced by original spare parts.
11.1 VisiWater DO Sensor
Ref Description Interface
243650 VisiWater DO Arc 120 FC10* 4-20 mA, Modbus
* FC10 = 10 m fix cable
11.2 Parts and Accessories
Ref Description Wetted parts
243515 ODO Cap H0 Stainless steel 1.4435
Silicone (FDA and USP
Class VI approved)
Application: For general application in biotechnology, water
treatment and monitoring as well as in breweries, wineries
and soft drink processing.
Ref Description Wetted parts
243505 ODO Cap H2 Stainless steel 1.4435
PTFE (USP Class VI)
Application: For fermentation processes where sterilization
in place (SIP) is performed in media containing higher amounts
of lipophilic compounds. It comes with a hygienic design.
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ORDERING INFORMATION ORDERING INFORMATION
Ref Qualification (IQ/OQ)
243999-07 IQ/OQ per sensor measuring point
Description: Documentation of the initial operation and
calibration of the measuring system, provision of the
measuring and testing equipment, check and certification
(without travel costs)
243999-08 Ever y further IQ/OQ of the same kind per
Ref Product Name
242411 USB RS485 Modbus Converter
Description: Designed for wired communication between
HDM and VisiWater DO Arc FC10 sensor.
11. 3 S e r vi ce s
Ref Training sessions
243999-12 On-site training (half-day)
Description: Impar ting of fundamental knowledge about
pH/ORP/Conductivity/DO/cell density sensor measuring
technology incl. documents and participation confirmation,
excl. travel costs
sensor measuring point
243999-14 IQ/OQ Documentation per sensor gauge
incl. report documents and instructions for
qualification
Ref Maintenance
243999-10 Maintenance per DO measuring point
Description: Check of the response behavior, calibration
with air and nitrogen 5.0, replacement of the electrolytes,
cleaning of the internal body, check of the temperature
probe, check of the sensor quality with VisiWater DO sensor,
incl. calibration certificate
243999-13 Every further maintenance of the same kind
per sensor measuring point
NOTE: These services are only available in the
following locations: Europe, Africa and China.
Ref Service packages
243999-17 PREMIUM service package DO sensor
243999-20 BASIC service package DO sensor
Ref Service tools
238999-4456 DO service case
Ref Initial operation and calibration
243999-05 Initial operation per sensor measuring point
Description: Sensor parametrization, connection of the
sensor cable, calibration of the measuring chain (without
transmitter/SPS), check and certification, provision of
the measuring and testing equipment as well as orientation
of the operator personnel
243999-06 Every further initial operation of the
same kind per sensor measuring point
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NOTES NOTES
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35Operating Instructions VisiWater
Page 19
Windows is a registered trademark or trademark of Microsoft Corporation in the United States and/or other countries.
© 2016 Hamilton Bonaduz AG. All rights reserved.
624821/01 — 06/ 2016
Web: www.hamiltoncompany.com
USA: 800-648-5950
Europe: +41-58 -610 -10-10
Hamilton Americas & Pacific Rim
4970 Energy Way
Reno, Nevada 89502 USA
Tel: +1-775-858-3000
Fax: +1-775-856-7259
sales@hamiltoncompany.com
Hamilton Europe, Asia & Africa
Via Crusch 8
CH-7402 Bonaduz, Switzerland
Tel: +41-5 8- 610-10-10
Fax: +41-58- 610-00-10
contact.pa.ch@hamilton.ch
To find a representative in your area, please visit www.hamiltoncompany.com.
This guide may be available in other languages.
Visit www.hamiltoncompany.com for more information.
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