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Handbook
Handbook
OPTISENS ORP 8590
OPTISENS ORP 8590
OPTISENS ORP 8590OPTISENS ORP 8590
HandbookHandbook
ORP sensor
The documentation is only complete when used in combination with the relevant
documentation for the signal converter.
© KROHNE 01/2014 - 4001933801 MA OPTISENS ORP 8590 R01 en
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: IMPRINT :::::::::::::::::::::::::::::::::::::::
OPTISENS ORP 8590
All rights reserved. It is prohibited to reproduce this documentation, or any part thereof, without
the prior written authorisation of KROHNE Messtechnik GmbH.All rights reserved. It is
prohibited to reproduce this documentation, or any part thereof, without the prior written
authorisation of Sensus.All rights reserved. It is prohibited to reproduce this documentation, or
any part thereof, without the prior written authorisation of Siemens.All rights reserved. It is
Copyright 2014 by
KROHNE Messtechnik GmbH - Ludwig-Krohne-Str. 5 - 47058 Duisburg (Germany)Copyright 2014
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OPTISENS ORP 8590
CONTENTS
1 Safety instructions 5
1.1 Intended use ..................................................................................................................... 5
1.2 Safety instructions from the manufacturer ..................................................................... 5
1.2.1 Copyright and data protection ................................................................................................ 5
1.2.2 Disclaimer ............................................................................................................................... 6
1.2.3 Product liability and warranty ................................................................................................ 6
1.2.4 Information concerning the documentation........................................................................... 6
1.2.5 Warnings and symbols used................................................................................................... 7
1.3 Safety instructions for the operator................................................................................. 7
2 Device description 8
2.1 Scope of delivery............................................................................................................... 8
2.2 Device description ............................................................................................................ 9
2.2.1 ORP sensor.............................................................................................................................. 9
2.3 Nameplate ........................................................................................................................ 9
3 Installation 10
3.1 General notes on installation ......................................................................................... 10
3.2 Storage and transport .................................................................................................... 10
3.3 Installation procedure .................................................................................................... 11
3.4 Pre-installation requirements ....................................................................................... 12
3.5 Electrical connection......................................................................................................12
3.5.1 Connecting the sensor cable to the signal converter .......................................................... 13
3.5.2 Connecting the cable to the sensor...................................................................................... 14
3.6 Calibrating the sensor.................................................................................................... 14
3.7 Installing the sensor....................................................................................................... 15
3.7.1 General installation instructions.......................................................................................... 15
4 Operation 16
4.1 Menu mode structure..................................................................................................... 16
4.2 Calibration ...................................................................................................................... 18
4.2.1 Calibrating ORP measurement............................................................................................. 18
4.2.2 Calibration log....................................................................................................................... 21
4.3 Troubleshooting.............................................................................................................. 22
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CONTENTS
OPTISENS ORP 8590
5 Service 23
5.1 Maintenance ................................................................................................................... 23
5.1.1 Cleaning ................................................................................................................................ 23
5.1.2 Aging and re-calibration ....................................................................................................... 23
5.2 Spare parts availability...................................................................................................23
5.3 Availability of services .................................................................................................... 23
5.4 Returning the device to the manufacturer..................................................................... 24
5.4.1 General information.............................................................................................................. 24
5.4.2 Form (for copying) to accompany a returned device............................................................ 25
5.5 Disposal .......................................................................................................................... 25
6 Technical data 26
6.1 Measuring principle........................................................................................................26
6.1.1 ORP measurement................................................................................................................ 26
6.2 Technical data................................................................................................................. 27
6.3 Dimensions ..................................................................................................................... 29
7 Appendix 30
7.1 ORP as a function of mV ................................................................................................. 30
7.2 ORP dependency............................................................................................................31
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OPTISENS ORP 8590
1.1 Intended use
CAUTION!
Responsibility for the use of the measuring devices with regard to suitability, intended use and
corrosion resistance of the used materials against the measured fluid lies solely with the
operator.
INFORMATION!
The manufacturer is not liable for any damage resulting from improper use or use for other than
the intended purpose.
The intended use of OPTISENS ORP 8590 sensor is the measurement of ORP value in water
applications. The sensor is suitable for connection to the MAC 100 signal converter.
1.2 Safety instructions from the manufacturer
1.2.1 Copyright and data protection
The contents of this document have been created with great care. Nevertheless, we provide no
guarantee that the contents are correct, complete or up-to-date.
SAFETY INSTRUCTIONS 1
The contents and works in this document are subject to copyright. Contributions from third
parties are identified as such. Reproduction, processing, dissemination and any type of use
beyond what is permitted under copyright requires written authorisation from the respective
author and/or the manufacturer.
The manufacturer tries always to observe the copyrights of others, and to draw on works created
in-house or works in the public domain.
The collection of personal data (such as names, street addresses or e-mail addresses) in the
manufacturer's documents is always on a voluntary basis whenever possible. Whenever
feasible, it is always possible to make use of the offerings and services without providing any
personal data.
We draw your attention to the fact that data transmission over the Internet (e.g. when
communicating by e-mail) may involve gaps in security. It is not possible to protect such data
completely against access by third parties.
We hereby expressly prohibit the use of the contact data published as part of our duty to publish
an imprint for the purpose of sending us any advertising or informational materials that we have
not expressly requested.
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1 SAFETY INSTRUCTIONS
1.2.2 Disclaimer
The manufacturer will not be liable for any damage of any kind by using its product, including,
but not limited to direct, indirect or incidental and consequential damages.
This disclaimer does not apply in case the manufacturer has acted on purpose or with gross
negligence. In the event any applicable law does not allow such limitations on implied warranties
or the exclusion of limitation of certain damages, you may, if such law applies to you, not be
subject to some or all of the above disclaimer, exclusions or limitations.
Any product purchased from the manufacturer is warranted in accordance with the relevant
product documentation and our Terms and Conditions of Sale.
The manufacturer reserves the right to alter the content of its documents, including this
disclaimer in any way, at any time, for any reason, without prior notification, and will not be liable
in any way for possible consequences of such changes.
1.2.3 Product liability and warranty
The operator shall bear responsibility for the suitability of the device for the specific purpose.
The manufacturer accepts no liability for the consequences of misuse by the operator. Improper
installation and operation of the devices (systems) will cause the warranty to be void. The
respective "Standard Terms and Conditions" which form the basis for the sales contract shall
also apply.
OPTISENS ORP 8590
1.2.4 Information concerning the documentation
To prevent any injury to the user or damage to the device it is essential that you read the
information in this document and observe applicable national standards, safety requirements
and accident prevention regulations.
If this document is not in your native language and if you have any problems understanding the
text, we advise you to contact your local office for assistance. The manufacturer can not accept
responsibility for any damage or injury caused by misunderstanding of the information in this
document.
This document is provided to help you establish operating conditions, which will permit safe and
efficient use of this device. Special considerations and precautions are also described in the
document, which appear in the form of underneath icons.
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OPTISENS ORP 8590
1.2.5 Warnings and symbols used
Safety warnings are indicated by the following symbols.
DANGER!
This information refers to the immediate danger when working with electricity.
DANGER!
This warning refers to the immediate danger of burns caused by heat or hot surfaces.
DANGER!
This warning refers to the immediate danger when using this device in a hazardous atmosphere.
DANGER!
These warnings must be observed without fail. Even partial disregard of this warning can lead to
serious health problems and even death. There is also the risk of seriously damaging the device
or parts of the operator's plant.
SAFETY INSTRUCTIONS 1
WARNING!
Disregarding this safety warning, even if only in part, poses the risk of serious health problems.
There is also the risk of damaging the device or parts of the operator's plant.
CAUTION!
Disregarding these instructions can result in damage to the device or to parts of the operator's
plant.
INFORMATION!
These instructions contain important information for the handling of the device.
LEGAL NOTICE!
This note contains information on statutory directives and standards.
• HANDLING
HANDLING
HANDLINGHANDLING
This symbol designates all instructions for actions to be carried out by the operator in the
specified sequence.
i RESULT
RESULT
RESULTRESULT
This symbol refers to all important consequences of the previous actions.
1.3 Safety instructions for the operator
WARNING!
In general, devices from the manufacturer may only be installed, commissioned, operated and
maintained by properly trained and authorized personnel.
This document is provided to help you establish operating conditions, which will permit safe and
efficient use of this device.
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2 DEVICE DESCRIPTION
2.1 Scope of delivery
INFORMATION!
Inspect the cartons carefully for damages or signs of rough handling. Report damage to the
carrier and to the local office of the manufacturer.
INFORMATION!
Do a check of the packing list to make sure that you have all the elements given in the order.
INFORMATION!
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.
OPTISENS ORP 8590
Figure 2-1: Standard scope of delivery
1 Ordered sensor
2 Documentation
Optional accessories
• SENSOFIT FLOW 1000 - flow through assembly
• SENSOFIT IMM 1000/2000 - immersion assembly
• SENSOFIT RET 1000/2000 - retractable assembly
• Cable pH/ORP-W US style sensor 4 pin connector to hanked 7.62 m 25ft / 10 m 33ft
Consumables/Spare parts available
• Various ORP solutions for sensor calibration
• Various cleaning solutions
OPTISENS ORP 8590
• with 23 mm 0.91¨ length and attached cable 7.62 m 25 ft / 10 m 33 ft
• with 44 mm 1.75¨ length and attached cable 7.62 m 25 ft / 10 m 33 ft
• with 23 mm 0.91¨ length and 4-pin connector
• with 44 mm 1.75¨ length and 4-pin connector
INFORMATION!
For further Information contact your local sales office.
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OPTISENS ORP 8590
2.2 Device description
2.2.1 ORP sensor
DEVICE DESCRIPTION 2
1 Thread for sensor cable connector
2 O-Ring
3 Hexagonal nut
4 Thread
5 Washer
6 O-Ring
7 Diaphragm
8 Pt-Ring
9 OPTISENS ORP 8590
2.3 Nameplate
INFORMATION!
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.
The sensor type is specified on the labelling of the sensor package and on the sensor itself.
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3 INSTALLATION
3.1 General notes on installation
INFORMATION!
Inspect the cartons carefully for damages or signs of rough handling. Report damage to the
carrier and to the local office of the manufacturer.
INFORMATION!
Do a check of the packing list to make sure that you have all the elements given in the order.
INFORMATION!
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.
3.2 Storage and transport
CAUTION!
Do not store the sensor tip dry. This will shorten lifetime considerably.
Always store the ORP sensor tip wet in a 3 molar KCl solution when not in use. Saltless water
must be avoided since this would leak the KCl ions. The original packing in which the sensor tip
was delivered contains a plastic tube with KCl solution and therefore is suitable for storage and
transport (see following drawing).
OPTISENS ORP 8590
• Since the ORP sensor is made out of glass it is very fragile. Avoid shocks of any kind.
• Do not touch or scratch the ORP sensitive glass tip of the sensor.
• Store the sensor in its original packaging in a dry, dust-free location. Keep it away from dirt. If
necessary, clean it as described on page 23.
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OPTISENS ORP 8590
Figure 3-1: pH sensor in its original packaging
1 Padding
2 Plastic tube filled with 3 molar KCl solution
3 pH sensor
4 O-ring
5 Washer
6 Protective cap over electrical connector
7 Sealing cap without hole to seal plastic tube 2 when sensor is in use
Storing the sensor in the provided plastic tube
• Screw the sealing cap off the plastic tube. Keep it in the original packaging.
• If there is not enough KCl solution in the plastic tube, fill it up with 3 molar KCl solution.
• Insert the sensor tip through the hole in the storage cap (see drawing on page 12).
• Carefully push the O-ring delivered with the storage cap on the sensor so that the cap sits over
the O-ring.
• Insert the sensor tip into the plastic tube until it is fully covered with KCl solution.
• Tighten the cap.
• Store the sensor in its original packaging.
INSTALLATION 3
3.3 Installation procedure
Because a new ORP sensor needs to be calibrated before it is installed into its final measuring
location, it is important to follow the installation order:
1. Unpack the sensor.
2. Connect the sensor to the signal converter.
3. Calibrate the sensor.
4. Install the sensor into its final measuring location.
The required steps are explained in the following sections.
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3 INSTALLATION
3.4 Pre-installation requirements
CAUTION!
•
Never touch or scratch the platinum measuring tip of the ORP sensor.
•
Make sure that the glass tip is clean and dust-free. If necessary, clean the tip as described on
page 23
OPTISENS ORP 8590
Figure 3-2: Handling the sensor
Unpacking the sensor
• Loosen the storage cap which is screwed or/and pushed on to the plastic tube 1.
• Gently pull the sensor out of the plastic tube 2.
• Lay the sensor on a soft mat/tissue 3.
• Screw or push the provided sealing cap on to the plastic tube, using O-ring as shown in the
drawing 4. Keep the storage cap (the one with the hole in it) in the original packaging.
3.5 Electrical connection
DANGER!
For devices used in hazardous areas, additional safety notes apply; please refer to the Ex
documentation.
DANGER!
All work on the electrical connections may only be carried out with the power disconnected.
DANGER!
Observe the national regulations for electrical installations!
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WARNING!
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.
INFORMATION!
Look at the device nameplate to ensure that the device is delivered according to your order.
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OPTISENS ORP 8590
3.5.1 Connecting the sensor cable to the signal converter
DANGER!
All work on the electrical connections may only be carried out with the power disconnected. Take
note of the voltage data on the nameplate!
INFORMATION!
Look at the device nameplate to ensure that the device is delivered according to your order.
INSTALLATION 3
Figure 3-3: Sensor connection terminals on the signal converter dual channel version with terminal block A+B
1 Sensor connection terminals
2 Terminal block S (protective earth)
3 Terminal block A: terminals for sensor and temperature
4 Terminal block B: terminals for sensor and temperature
The ORP sensor is connected to the signal converter using a coax cable.
When ordering the one channel version, only the interface "Pos.A" is populated. In the version
with two channels the interfaces "Pos.A" and "Pos.B" are populated.
Wire
Wire Terminal block Pos.A/B
WireWire
OPTISENS ORP 8590 with double coax cable
OPTISENS ORP 8590 with double coax cable
OPTISENS ORP 8590 with double coax cableOPTISENS ORP 8590 with double coax cable
Inner coax shield (black) N (ref.)
Coax core (transparent) O (pH)
Pt100 (white) P
Pt100 (red) X
Terminal block Pos.A/B
Terminal block Pos.A/BTerminal block Pos.A/B
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3 INSTALLATION
Figure 3-4: Connecting the sensor cable
The following instructions describe the connection of the different sensor cables.
Connecting the sensor cable to the signal converter
• Thread the sensor cable through the outer right cable gland 1.
• Push the coax shield 4 into terminal N 2 and the coax core into terminal O 3.
• To remove a cable, press down the white clip 5 on the corresponding terminal and pull the
cable out 6.
OPTISENS ORP 8590
3.5.2 Connecting the cable to the sensor
CAUTION!
Moisture inside the sensor connector must be avoided! Moisture may cause a shortcut and
deliver erratic readings!
If moisture has entered the connector, dry it with air (e.g. hair blower).
Figure 3-5: Connecting the cable to the sensor
Connecting the cable to the sensor
• Unscrew the protective cap from the sensor connector and keep it for future use 1.
• Ensure that both cable and sensor connector are absolutely dry 2.
• Make sure that the O-ring is positioned on the sensor connector 3.
• Screw the cable connector 4 on to the sensor and tighten it by hand.
3.6 Calibrating the sensor
Before the sensor is installed, it has to be calibrated. Proceed as described on page 18. Then
continue with the installation procedure.
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OPTISENS ORP 8590
3.7 Installing the sensor
3.7.1 General installation instructions
The sensor tip must always have full contact with the measuring medium.
The mounting position of the sensor should not deviate more than 75° from vertical position
(sensor tip pointing downwards). Doing otherwise might cause internal air bubbles to float into
the sensor glass tip. This would interrupt the electrical contact between the inner buffer solution
and the glass surface.
INSTALLATION 3
Figure 3-6: Installation requirements
1 Measuring medium
2 Maximum deviation of 75° from vertical position
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4 OPERATION
4.1 Menu mode structure
INFORMATION!
The following table just presents an overview. Additional levels are accessible from certain
menus offering the possibility to change presets.
OPTISENS ORP 8590
Measuring
mode
3 or 4
pages,
scrolling
with ↓ or ↑
Main menu Submenu Parameter
>2.5s^A quick setup
>2.5s^B test
A quick setup >^A1 language >^For further
A quick setupA quick setup
A2 Tag
A3 hold function
A4 set clock
A5 reset errors
A6 analog
outputs
A9...A11: calibration menus for process input A;
existence of the single sub-menus depends on the
hardware setting and the used sensor (e.g. if you use a
pH sensor then only the menu A8 with the name "pH
cal." appears); refer to sensor manual for further
information.
A12...A16: calibration sub-menus for process input B,
existence also depending on the hardware setting and
the used sensor.
↓↑ ↓↑ ↓↑ ↓↑
B test >^B1 Simulation
B testB test
↓↑ ↓↑ ↓↑ ↓↑
Process Input A>^
B2 Simulation
Process Input B
>^A6.1 measurement
A6.3 range
A6.4 time constant
B1.1...B1.7: simulation menus
for process input A; existence of
the single sub-menus depends
on the hardware setting and the
used sensor, refer to sensor
manual for further information.
B2.1...B2.7: simulation menus
for process input B; existence of
the single sub-menus depends
on the hardware setting and the
used sensor, refer to sensor
manual for further information.
information
see function
tables.
>^For further
information
see function
tables.
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OPTISENS ORP 8590
OPERATION 4
Measuring
mode
3 or 4
pages,
scrolling
with ↓ or ↑
Main menu Submenu Parameter
>2.5s^B test
>2.5s^C setup
B test >^B3 simulation IO >^B3.1 - / current output A >^For further
B testB test
B3.2 - / current output B
B3.3 - / current output C
B3.4 - / control input D
B4 actual values B4.1...B4.8: menus which show
B5 logbooks B5.1 status log
B6 information B6.1 C number
↓↑ ↓↑ ↓↑ ↓↑
C setup >^C1 process input A>^C1.1...C1.18: menus for the
C setupC setup
C2 process input
B
↓↑ ↓↑ ↓↑ ↓↑
the corresponding actual
reading; existence of the single
sub-menus depends on the
hardware setting and the used
sensor; refer to sensor manual
for further information.
B5.2 calibration log
B6.2 process input A
B6.3 process input B
B6.4 SW.REV. MS
B6.5 SW.REV. UIS
B6 Electronic Revision ER
setup of the corresponding
process input; existence of the
single sub-menus depends on
the hardware setting and the
used sensor; refer to sensor
manual for further information.
C2.1...C2.17: menus for the
setup of the corresponding
process input; existence of the
single sub-menus depends on
the hardware setting and the
used sensor; refer to sensor
manual for further information.
information
see function
tables.
>
^
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4 OPERATION
OPTISENS ORP 8590
Measuring
Main menu Submenu Parameter
mode
3 or 4
pages,
scrolling
with ↓ or ↑
>2.5s^C setup
D service:
D service: This menu is password protected and contains functions to be used by service personnel only.
D service:D service:
C setup >^C3 I/O >^C3.1 hardware >^For further
C setupC setup
C5 device >^C5.1 device info
↓↑ ↓↑ ↓↑ ↓↑
4.2 Calibration
4.2.1 Calibrating ORP measurement
The potential of an ORP electrode is calibrated using a ORP buffer solution. In the course of that,
the difference between the measured potential and the potential of the calibration solution is
determined. This potential difference is printed on the buffer solution bottle and is defined as the
voltage across the ORP electrode and a reference electrode. ORP sensors require no calibration,
but you can perform a one-point calibration with an ORP buffer solution.
C3.2 current output A
C3.3 current output B
C3.4 current output C
C5.2 display
C5.3 1.meas.page
C5.4 2.meas.page
C5.5 graphic page
C5.6 special functions
C5.7 units
information
see function
tables.
INFORMATION!
Remove the watering cap before starting the calibration.
CAUTION!
•
Never touch or scratch the platinum measuring tip of the ORP sensor.
•
Make sure that the glass tip is clean and dust-free. If necessary, clean the tip as described on
page 23
CAUTION!
Moisture inside the sensor connector must be avoided! Moisture may cause a shortcut and
deliver erratic readings!
If moisture has entered the connector, dry it with air (e.g. hair blower).
To avoid alarms on the distributed control system (DCS) when temporarily removing the sensor
(i.e. for maintenance), the signal converter has a hold function. This function "freezes" all
outputs (i.e. the display and the current outputs) of the last measured value.
INFORMATION!
As an indication that the manual hold function is active, the "warning sign" in the upper left
corner of the display appears. Meanwhile the status messages show "checks in progress". For
more details about how to select the manual hold function refer to the signal converter manual.
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OPTISENS ORP 8590
After starting-up the signal converter, the measuring screen appears. This is the standard
screen which is displayed automatically in the normal operating mode. If you are in this mode
and you want to initiate a calibration, you have to activate the manual hold function in the first
step.
Step 1: activating the hold function
OPERATION 4
• Press >
• Press
> for more than 2.5 seconds, then release the button. You are on the main menu level. In the
>>
upper line of the display "A" appears, beneath the main menu quick setup
or until the main menu quick setup
MAIN MENU
> A quick setup
> A quick setup
> A quick setup> A quick setup
B test
Csetup
D service
• Press >
> to enter the chosen menu.
>>
You are on the first submenu level. In the upper line of the display "quick setup" and
A1" appears, beneath the submenu language
• Press
• Press >
or until the submenu hold function
> to enter the chosen menu.
>>
quick setup is highlighted.
quick setupquick setup
You are on the second submenu level. In the upper line of the display
"manual hold" appears, beneath the option off
• Press
or to choose the option on
quick setup is highlighted.
quick setupquick setup
language is highlighted.
languagelanguage
hold function is highlighted.
hold functionhold function
off is highlighted
offoff
• Press ^ to confirm the entered value.
• You have activated the hold function. Go to the next step and prepare the calibration
procedure. You have to return to the measuring mode.
• Press ^ until you reach the measuring mode again.
Step 1a: accessing the calibration menu via the main menu setup
setup
setupsetup
• Press >
• Press
> for more than 2.5 seconds, then release the button. You are on the main menu level. In the
>>
upper line of the display "A" appears, beneath the main menu quick setup
or until the main menu setup
MAIN MENU
A quick setup
B test
> C setup
> C setup
> C setup> C setup
D service
• Press >
> to enter the chosen menu.
>>
You are on the first submenu level. In the upper line of the display "setup" and "c1" appears,
beneath the submenu process input A
Press or to select process input A
input A or B.
• Press >
> to enter the chosen menu.
>>
setup is highlighted.
setupsetup
process input A is highlighted.
process input Aprocess input A
process input A or process input B
process input A process input A
process input B is highlighted. Choose process
process input Bprocess input B
• You are on the second submenu level. The submenu ORP cal.
• Press >
> to enter the chosen menu.
>>
quick setup is highlighted.
quick setupquick setup
ORP cal. is highlighted.
ORP cal.ORP cal.
• You can start the calibration procedure now as described in "Step 2".
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4 OPERATION
OPTISENS ORP 8590
Step 1b: accessing the calibration menu via the main menu quick setup
• Press >
> for more than 2.5 seconds, then release the button. You are on the main menu level. In the
>>
upper line of the display "A" appears, beneath the main menu quick setup
MAIN MENU
> A quick setup
> A quick setup
> A quick setup> A quick setup
B test
C setup
D service
• Press >
> to enter the chosen menu.
>>
You are on the first submenu level. In the upper line of the display "quick
setup" and "a" appears, beneath the submenu language
Press or until the submenu ORP calibration A
• Press >
> to enter the chosen menu.
>>
quick setup is highlighted.
quick setupquick setup
ORP calibration A or BBBB is highlighted.
ORP calibration AORP calibration A
quick setup
quick setupquick setup
language is highlighted.
languagelanguage
• You can start the calibration procedure now as described in "Step 2".
• You can start the calibration procedure now as described in "Step 2".
Step 2: preparing the calibration procedure
• If you re-calibrate an existing sensor, remove the sensor from its respective assembly and.
• If you calibrate a new sensor, make sure that the sensor is correctly connected to the signal
converter.
• Check the sensor for damages, check the diaphragm for coating and rinse the sensor tip with
tap water and gently swipe it with a soft tissue.
• Provide a suitable calibration solution.
After activating the hold function and the preparative measures, you can get access to the
calibration procedure from the measuring mode in two different ways. Either you go via the main
menu setup
setup (step 3a) or via the main menu quick setup
setupsetup
quick setup (step 3b).
quick setupquick setup
Step 3: calibration procedure
• After choosing the submenu ORP
previous steps, continue by pressing >>>>.
ORP (step 1a) or ORP calibration A or B
ORPORP
ORP calibration A or B (step 1b) and step 2 in the
ORP calibration A or BORP calibration A or B
i The currently measured value is shown on the display.
• Press ^^^^ to finally start the calibration procedure.
• Submerge the sensor tip into the ORP buffer solution.
• Wait until a steady value is displayed.
• Press ^^^^ to continue the calibration procedure.
i The message ref. value ORP
ref. value ORP and the value of the buffer solution are displayed on the
ref. value ORPref. value ORP
screen.
• Enter the value of the buffer solution by pressing or and >>>>. Press ^^^^ to confirm the
setting.
• After 25 seconds the calibration step is completed.
i The message zero point is displayed on the screen.
• Press ^^^^ to confirm the setting.
i The message store cal. value is displayed on the screen. The signal converter asks if the
new calibration values should be stored.
• Choose yes
• Press ^^^^ to confirm.
yes using or to store the calibration values. Choose no
yesyes
no to discard the results.
nono
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OPTISENS ORP 8590
• If you want to return to the measuring mode, press ^^^^ several times until you reach this mode.
Prior returning to the measuring display, you are asked if the configuration should be stored.
Choose yes
INFORMATION!
If an error occurs during the calibration procedure, the display shows an error message.
Possible causes for an error are:
Step 4: re-installing the sensor
• After the calibration procedure, rinse the sensor with tap water.
• Reinstall the sensor into its assembly, refer to
Step 5: switching back to measurement
• Deactivate the function hold function
4.2.2 Calibration log
OPERATION 4
yes using or to store the new calibration values. Press ^^^^ to confirm.
yesyes
hold function again.
hold functionhold function
Installing the sensor
on page 15.
INFORMATION!
In order to show the history of the calibrations, the signal converter has a calibration logbook
function. Up to 64 entries of the calibration history are stored including date and time.
Accessing the calibtration log
• Press >
• Press
> for more than 2.5 seconds, then release the button. You are on the main menu level. In the
>>
upper line of the display "A" appears, beneath the main menu quick setup
or until the main menu test
MAIN MENU
A quick setup
> B test
> B test
> B test> B test
C setup
D service
Press >>>> to enter the chosen menu.
You are on the first submenu level. In the upper line of the display "test" and "B1" appears,
beneath the submenu sim.process input A
Press or until the submenu logbooks
Press >>>> to enter the chosen menu.
You are on the second submenu level. In the upper line of the display "logbooks" and
"B1" appears, beneath the submenu status log
Press or until the submenu calibration log
Press >>>> to enter the chosen menu.
test is highlighted.
testtest
sim.process input A is highlighted.
sim.process input Asim.process input A
logbooks is highlighted.
logbookslogbooks
status log is highlighted.
status logstatus log
calibration log is highlighted.
calibration logcalibration log
quick setup is highlighted.
quick setupquick setup
• You are on the data level and you see the calibration history. With the help of or you can
scroll through the different entries.
• If you want to return to the measuring mode press ^^^^ several times until you reach this mode.
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4 OPERATION
4.3 Troubleshooting
Problem Possible cause Remedy
OPTISENS ORP 8590
The ORP sensor
does not deliver a
signal.
The ORP sensor
delivers a bad
signal.
The ORP electrode
delivers an
unstable signal.
Mechanical damage of the
platinum electrode, e.g.
scratches.
Moisture inside the
sensor connector.
Coated/abraded platinum
electrode.
The diaphragm in the
reference half-cell does
not provide good contact
to the process medium
due to drying up or
coatings.
Exchange sensor.
Clean the connector (sensor/cable) with pure water
and dry with air (e.g. hair blower).
Clean the platinum electrode by using aqua regia (this
procedure uses hazardous chemicals and should only
be performed by a qualified person), HCl
concentrated/HNO3 concentrated (1/1).
• Clean the diaphragm with hot soap or acid using a
soft tissue (details on page 23).
• Submerge sensor in water and increase the
temperature to 50...60°C / 122...140°F.
• Submerge sensor in 3 molar KCl solution at ambient
temperature. The decrease in temperature will cause
the reference half cell to suck in KCl solution through
the diaphragm and regenerate the diaphragms
functionality.
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OPTISENS ORP 8590
5.1 Maintenance
5.1.1 Cleaning
• Clean the platinum sensor surface with demineralised water.
• Slight dirt residues or dust: Rinse the sensor tip with demineralised water and clean it with a
soft tissue.
• Oily and greasy coatings: Remove with a warm soap solution and rinse with demineralised
water.
• Hardness deposits or metal hydroxide deposits: Soak the sensor tip including diaphragm in
10% citric acid or hypochloric acid for a couple of minutes and rinse the complete glass shaft
of the sensor with demineralised water.
• Biological fouling: Soak the sensor tip including diaphragm in 10 % pepsin solution for
minimum 3 hours and afterwards rinse the complete glass shaft of sensor with demineralised
water.
5.1.2 Aging and re-calibration
During operation, but already during storage, ORP sensors age due to poisoning effects of the
inner buffer system. Therefore it is important to re-calibrate the sensors in regular intervals as
described on page 18.
SERVICE 5
When the sensor becomes too old to provide reliable measurements, the signal converter
displays an error message after the calibration procedure. In this case, the sensor has to be
exchanged.
Aging effects ORP sensors:
• Shift of zero point:
Shift of zero point: Compare the value with the sensor specified "Offset"-Value printed on the
Shift of zero point:Shift of zero point:
"user manual sensors" (scope of delivery). The zero point of the sensor should be near +/- 5
mV compared to "offset" value. In this case perform a one-point calibration. For more
information refer to
value. If the calibration value deviate more than +/- 5 mV from the reference value, the sensor
should be replaced by a new one.
Calibration
5.2 Spare parts availability
The manufacturer adheres to the basic principle that functionally adequate spare parts for each
device or each important accessory part will be kept available for a period of 3 years after
delivery of the last production run for the device.
This regulation only applies to spare parts which are subject to wear and tear under normal
operating conditions.
5.3 Availability of services
on page 18. Compare the calibration value with the reference
The manufacturer offers a range of services to support the customer after expiration of the
warranty. These include repair, maintenance, technical support and training.
INFORMATION!
For more precise information, please contact your local sales office.
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5 SERVICE
5.4 Returning the device to the manufacturer
5.4.1 General information
This device has been carefully manufactured and tested. If installed and operated in accordance
with these operating instructions, it will rarely present any problems.
CAUTION!
Should you nevertheless need to return a device for inspection or repair, please pay strict
attention to the following points:
•
Due to statutory regulations on environmental protection and safeguarding the health and
safety of our personnel, manufacturer may only handle, test and repair returned devices that
have been in contact with products without risk to personnel and environment.
•
This means that the manufacturer can only service this device if it is accompanied by the
following certificate (see next section) confirming that the device is safe to handle.
CAUTION!
If the device has been operated with toxic, caustic, flammable or water-endangering products,
you are kindly requested:
•
to check and ensure, if necessary by rinsing or neutralising, that all cavities are free from
such dangerous substances,
•
to enclose a certificate with the device confirming that is safe to handle and stating the
product used.
OPTISENS ORP 8590
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OPTISENS ORP 8590
5.4.2 Form (for copying) to accompany a returned device
Company: Address:
Department: Name:
Tel. no.: Fax no.:Email address:
Manufacturer's order no. or serial no.:
The device has been operated with the following medium:
SERVICE 5
This medium is: water-hazardous
toxic
caustic
flammable
We checked that all cavities in the device are free from such
substances.
We have flushed out and neutralized all cavities in the
device.
We hereby confirm that there is no risk to persons or the environment through any residual media
contained in the device when it is returned.
Date: Signature:
Stamp:
5.5 Disposal
CAUTION!
Disposal must be carried out in accordance with legislation applicable in your country.
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6 TECHNICAL DATA
6.1 Measuring principle
6.1.1 ORP measurement
The oxidation reduction potential, ORP in short, is the measurement for the concentration of
oxidising and reducing agents in water. Its value is influenced both by pH and temperature. ORP
is a sum parameter that gives no information on the concentration of a single substance in a
mixture.
ORP measurements are used to monitor chemical reactions involving electron transfer. In
drinking water treatment it can be found in ozone treatment and the removal of iron, manganese
and nitrate as well as in disinfection steps. In swimming pools the German DIN 19643 requires
ORP measurements as a hygiene parameter and decrees maximum and minimum values for
fresh water, pool water, and salt water. In wastewater treatment ORP is measured in the
denitrification process and in detoxication of industrial wastewater.
The ORP sensor consists of a measuring electrode of platinum or gold and a reference of e.g.
Ag/AgCl. The potential of the measuring electrode changes with the concentration of reducing
and oxidising agents and is measured against the reference. The measured values can be
recalculated to fit literature values based on NHE (normal hydrogen electrode) as reference.
OPTISENS ORP 8590
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OPTISENS ORP 8590
6.2 Technical data
INFORMATION!
•
The following data is provided for general applications. If you require data that is more
relevant to your specific application, please contact us or your local sales office.
•
Additional information (certificates, special tools, software,...) and complete product
documentation can be downloaded free of charge from the website (Download Center).
ORP sensor
OPTISENS ORP 8590
Measuring system
Measuring principle Potentiometric
Measuring range -2000…+2000 mV
Design
Construction CPVC Body mit Tuff Tip®
Shaft diameter 20 mm / 0.79"
Length 23 mm / 0.91" or 44 mm / 1.74"
Process connection 3/4" MNPT
Temperature sensor Pt100
Sensor cap 4-pin connector or attached cable
Type of diaphragm Ceramic
TECHNICAL DATA 6
Measuring accuracy
Reference conditions Medium: water
Temperature: 20°C/ 68°F
Pressure: max. 1 bar / 14.5 psi (absolute)
Maximum measuring
error
Repeatability 0.2% full scale
Resolution 0.1 (or 0.01 in extended mode)
Long-term stability 24 hours: tested within accuracy definition
Temperature drift Tested within accuracy definition
Cable length variation Tested within accuracy definition
pH: 0.2% full scale
Temperature: 1.0% full scale
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6 TECHNICAL DATA
Operating conditions
Temperature range 0…+80°C / +23…+176°F
Max. operating
pressure
Minimum conductivity >150 µS/cm
Installation conditions
Process connection 3/4" MNPT
Immersion assembly SENSOFIT IMM 1000
Flow- through
assembly
Retractable assembly SENSOFIT RET 1000/2000
Materials
Sensor shaft CPVC
Measuring electrode Platinum
Inner buffer pH 7.0
Reference Double junction
Diaphragm Ceramic
Gasket Viton®
OPTISENS ORP 8590
6.9 barg / 100 psig at 60°C / 140°F
SENSOFIT FLOW 1000
Electrical connection
Connector 4-pin connector or attached cable
Cable Only for 4-pin connector: Cable pH/ORP-W US style sensor 4-pin connector to
Cable length 7.26 m / 25 ft; 10 m / 33 ft.
hancked
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OPTISENS ORP 8590
6.3 Dimensions
Figure 6-1: Dimensions OPTISENS ORP 8590
a 28.57 1 1/8
b 3/4" MNPT thread
c 23 / 44 0.91 / 1.74
d 171 6.73
TECHNICAL DATA 6
Dimensions [mm] Dimensions [inch]
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7 APPENDIX
7.1 ORP as a function of mV
The pH-value is the negative decadative logarithm of the hydrogen ion concentration, and it is
directly related to the proportion of hydrogen ions H
sensor measures excess or deficit of the hydrogen ions and gives a proportional millivolt signal
as output. The signal is 59.16 mV per 1 pH at 25°C / 77°F. In clean water there is a total balance
between hydrogen ions and hydroxide ions, the output from the electrode is 0.0 mV and pH is 7.
The millivolt signal is measured by the pH sensor and the corresponding pH value is calculated
in the signal converter.
OPTISENS ORP 8590
+
to hydroxide ions OH- in the media. The pH-
mV pH
414 0 1 0.00000000000001
355 1 0.1 0.0000000000001
296 2 0.01 0.000000000001 Coca Cola
237 3 0.001 0.00000000001
177 4 0.0001 0.0000000001 Orange juice
118 5 0.00001 0.000000001
59 6 0.000001 0.00000001 Milk
0 7 0.0000001 0.0000001 Clean water
-59 8 0.00000001 0.000001 Blood
-118 9 0.000000001 0.00001
-177 10 0.0000000001 0.0001
-237 11 0.00000000001 0.001
-296 12 0.000000000001 0.01
-355 13 0.0000000000001 0.1
-414 14 0.00000000000001 1 Sulfa
H+ ions [mol/l] OH- ions [mol/l]
Example
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7.2 ORP dependency
The output from a pH-electrode varies with the temperature in a predictable way. The size of the
variation depends on both the temperature and the pH being measured.
°C °F pH pH pH pH pH pH pH pH pH pH pH pH
5 41 2.30 3.24 4.18 5.12 6.06 7.00 8.06 9.12 10.18 11.24 12.30 13.36
15 59 2.15 3.12 4.09 5.06 6.03 7.00 8.03 9.06 10.09 11.12 12.15 13.18
25 77 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00
35 95 1.85 2.88 3.91 4.94 5.97 7.00 7.97 8.94 9.91 10.88 11.85 12.82
45 113 1.70 2.76 3.82 4.88 5.94 7.00 7.94 8.88 9.82 10.76 11.70 12.64
55 131 1.55 2.64 3.73 4.82 5.91 7.00 7.91 88.2 9.73 10.64 11.55 12.46
65 149 1.40 2.52 3.64 4.76 5.88 7.00 7.88 8.76 9.64 10.52 11.40 12.28
75 167 1.25 2.40 3.55 4.70 5.85 7.00 7.85 8.70 9.55 10.40 11.25 12.10
85 185 1.10 2.28 3.46 4.64 5.82 7.00 7.82 8.64 9.46 10.28 11.10 11.92
95 203 0.95 2.16 3.37 4.58 5.79 7.00 7.79 8.58 9.37 10.16 10.95 11.74
APPENDIX 7
At pH 7 and 25°C / 77°F the temperature error is zero. If temperature or pH changes the
temperature error is calculated using the following formula:
0.03 pH-difference / pH or 0.03 pH-difference / K
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KROHNE product overview
• Electromagnetic flowmeters
• Variable area flowmeters
• Ultrasonic flowmeters
• Mass flowmeters
• Vortex flowmeters
• Flow controllers
• Level meters
• Temperature meters
• Pressure meters
• Analysis products
• Products and systems for the oil & gas industry
• Measuring systems for the marine industry
Head Office KROHNE Messtechnik GmbH
Ludwig-Krohne-Straße 5
47058 Duisburg (Germany)
Tel.:+49 203 301 0
Fax:+49 203 301 103 89
info@krohne.com
The current list of all KROHNE contacts and addresses can be found at:
© KROHNE 01/2014 - 4001933801 MA OPTISENS ORP 8590 R01 en - Subject to change without notice.
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