Hamilton VisiWater DO, VisiWater DO Arc 120 FC10, VisiWater DO P Arc FC10 Operating Instructions Manual
VisiWater™ DO
Sensors
Operating Instructions
Applies to:
VisiWater DO Arc 120 FC10 (Stainless Steel)
VisiWater DO P Arc FC10 (Plastic)
Table of Contents
TABLE OF CONTENTSTABLE 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 .........................................................................7
3.4 Electrical Safety Precautions ......................................... 9
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................................................................11
5.1 Unpacking ................................................................... 11
5.2 Configuring the VisiWater DO sensor with ArcAir ........ 12
5.2.1 Installing ArcAir Basic on the Computer ............ 12
5.2.2 Connecting an VisiWater DO Sensor
to ArcAir ............................................................12
5.2.3 Create User Accounts ....................................... 13
5.2.4 Configuring the VisiWater DO
Sensor Parameters ........................................... 13
5.2.5 Configuring the calibration settings ................... 14
5.2.6 Configuring the temperature settings ............... 15
5.2.7 Configuring the analog interface for
your process control system ............................. 15
5.2.8 Defining a measuring point name for
identification of the process .............................. 15
5.3 Install VisiWater DO sensor in your
Measuring Loop .......................................................... 16
5.3.1 Mechanical Process Connection ..................... 16
5.3.2 Cable Pin Designation ....................................... 16
5.3.3 Controlling 4–20 mA current interface
signals by pulse-width modulation .................... 16
5.3.4 Electrical Connection for Analog
4–20 mA Connection ........................................ 18
5.3.5 Electrical connection for the
digital RS485 interface ...................................... 18
6 Operation ................................................................ 20
7 Maintenance ............................................................21
7.1 Verify Sensor Status and ODO Cap Functionality ........ 21
7.2 Replacing the ODO Cap .............................................. 22
7.3 Calibration....................................................................22
7.3.1 Automatic Standard Calibration with ArcAir ..... 22
7.3.2 Calibration in Air (Calibration Point Air) .............. 23
7.3.3 Zero Point Calibration (Point Zero Oxygen) ....... 24
7.4 Product calibration ...................................................... 24
7.5 Cleaning ...................................................................... 25
8 Troubleshooting ...................................................... 26
8.1 Sensor Self-Diagnostic ................................................ 26
8.1.1 Wa r n i ng s ........................................................... 27
8.1. 2 Er ro r s ................................................................ 28
8.2 Getting Technical Support ........................................... 28
8.3 Returning VisiWater DO sensor for Repair ................... 28
9 Disposal .................................................................. 29
10 Ordering Information .............................................. 29
10.1 VisiWater DO Sensor ................................................. 29
10.2 Accessories ...............................................................30
10.3 Services .....................................................................30
Hamilton Warranty
Please refer to the General Terms of Sales (GTS).
Important note
Copyright © 2018 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 document 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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DO Sens ors
3Operating Instructions VisiWater
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.
Typical applications are water analytics in waste water industry,
lakes or rivers, fish farming. The statinless steel version has
a PG 13.5 to be used in armatures or pipes, while the plastic
version will be used in basin or ponds.
If the sensor is used in contact with gaseous or liquid organic
solvents, the resulting measurement accuracy in this application
must be separately checked and validated by the customer.
ATTENTION! VisiWater DO sensor is not intended
for hazardous atmospheres.
ATTENTION! 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.
ATTENTION! Essential information for avoiding
personal injury or damage to equipment.
NOTE: Important instructions or interesting information.
in order to avoid consequential damages. The user is responsible
for taking suitable precautions in the event of a sensor failure.
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 on the website www.hamiltoncompany.com
as regards temperature, pressure etc. may under no circumstances be exceeded. Inappropriate use or misuse can be dangerous.
The lifetime of the VisiWater DO highly depends on the specific
conditions of the application. Temperature, pressure, chemicals
used may accelerate the ageing of both the sensor and its ODO
cap. See chapter 7 for replacement conditions.
Cleaning, assembly and maintenance should be performed by
personnel trained in such work. Before removing the sensor from
the measuring setup, always make sure that no process medium
can be accidently 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.
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
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 (see www.hamiltoncompany.com).
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DO Sens ors
5Operating Instructions VisiWater
SAFETY PRECAUTIONS AND HAZARDS SAFETY PRECAUTIONS AND HAZARDS
Make sure that the PG13,5 (stainless steel version) 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 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. Make sure that no air or gas bubbles sticks to the
sensitive part of the sensor. As a consequence, the measurement
value could be unstable. Do not put stress on the system by
vibration, bending or torsion. Before use, verify that the sensor is
properly configured for your application.
Failure to observe and carry out the maintenance procedures
may impair the reliability and correct functioning of the measurement system.
ATTENTION! When unscrewing the PG13,5 (stainless steel version) 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.
If the sensor is used in contact with gaseous or liquid organic
solvents, the resulting measurement accuracy and stability in
those applications must be separately checked and validated by
the customer.
3.3 Earthing
The sensor has to be mounted at the mounting location with an
electrostatically conductive of < 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.
Option 1: The Metal vessel is connected to earth via
stainless steel PG13,5 thread
The sensor shaft is connected to the metal tank over the PG13,5
thread
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.
ATTENTION! IP68 can be reached if the ODO Cap is
always attached firmly to the sensor shaft.
The integrated 4–20 mA analog output has been configured according to factory defaults. Before use, verify that the sensor is
properly configured for your application.
The ODO Caps are consumable parts of the VisiWater DO. The
operating lifetime of the ODO Caps depend strongly on the operating conditions of the process. Make sure that following cross
sensitivities and resistances of ODO Caps are respected.
Cross sensitivities and resistances of ODO Cap H0/H20
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
Green/Yellow Cable
Figure 1: Metal vessel with earth connection
NOTE: If the vessel is not connected to earth, Option 2
has to be applied.
Option 2: Glass or plastic vessel with plastic sensor
shaft (sensor not connected to earth via tank)
The glass or plastic tank has no connection to earth and
therefore it is necessary to connect the sensor shaft via a
screw clamp or sensor cable to earth.
*Tested for 30 min at 25°C
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DO Sens ors
7Operating Instructions VisiWater
SAFETY PRECAUTIONS AND HAZARDS PRODUCT DESCRIPTION
3.4 Electrical Safety Precautions
Green/Yellow Cable
Plastic
version
only!
SST Version
Figure 2: Glass or plastic vessel without ear th connection
Below several examples how to connect the shaft of the sensor
directly to earth as required in Figure 2 are shown.
Do not connect the sensor to a power source of any voltage
beyond the range stated in the power rating Technical Specifications (see www.hamiltoncompany.com).
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.
ATTENTION! Switch off the power supply and
unplug the connector before dismounting the
VisiWater DO sensor.
ATTENTION! If the power supply (230VAC/24VDC)
is switched off or disconnected the reading on the
PCS is wrong.
External earth cable
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.
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.
Figure 3: Example clamps for conne cting the earth
to armature and metallic housing of the tank.
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
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DO Sens ors
9Operating Instructions VisiWater
PRODUCT DESCRIPTION INSTALLATION
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.
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.
Fix cable
Fix cable
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)
Sensor Head with
micro transmitter
Process connection
PG13,5 stainless
steel
O-ring
Sensor shaft with
stainless steel
ODO Cap with oxyge n-sensitive
luminophore (sensory element)
Figure 4: VisiWater DO sensor hardware description.
Sensor Head
with micro
transmitter
Sensor shaft
with PVC
material
ODO Cap with oxyge n
sensitve luminophore
(sensory element)
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.
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.
™
DO Sens ors
11Operating Instructions VisiWater
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