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Handbook
Handbook
SMARTSENS PH 2390
SMARTSENS PH 2390
SMARTSENS PH 2390SMARTSENS PH 2390
HandbookHandbook
Digital pH sensor for the wastewater industry
Electronic Revision:
ER 3.3.x
(SW.REV. 1.x.x)
© KROHNE 11/2013 - 4002546302 - MA SMARTSENS PH 2390 R02 en
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: IMPRINT :::::::::::::::::::::::::::::::::::::::
SMARTSENS PH 2390
All rights reserved. It is prohibited to reproduce this documentation, or any part thereof, without
the prior written authorisation of KROHNE Messtechnik GmbH.
Subject to change without notice.
Copyright 2013 by
KROHNE Messtechnik GmbH - Ludwig-Krohne-Str. 5 - 47058 Duisburg (Germany)
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SMARTSENS PH 2390
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 pH sensor ................................................................................................................................9
2.3 Nameplate ...................................................................................................................... 10
3 Installation 11
3.1 General notes on installation ......................................................................................... 11
3.2 Storage and transport .................................................................................................... 11
3.3 Installation procedure .................................................................................................... 12
3.4 Pre-installation requirements ....................................................................................... 12
3.5 Electrical connection......................................................................................................13
3.5.1 Connecting the cable to the sensor...................................................................................... 13
3.5.2 Connecting the sensor cable ................................................................................................ 14
3.5.3 Connecting with junction box SJB 200 W.............................................................................. 14
3.6 Installing the sensor....................................................................................................... 16
3.6.1 General installation instructions.......................................................................................... 16
4 Operation 17
4.1 Calibration ...................................................................................................................... 17
4.1.1 Calibration with PACTware
4.1.2 Calibration with HART® Handheld 475 FIELD COMMUNICATOR ........................................ 19
4.2 Troubleshooting.............................................................................................................. 22
4.3 Status messages and diagnostic information................................................................ 23
TM........................................................................................................................ 17
5 Service 24
5.1 Maintenance ................................................................................................................... 24
5.1.1 Cleaning ................................................................................................................................ 24
5.1.2 Aging and re-calibration ....................................................................................................... 24
5.2 Availability of services .................................................................................................... 25
5.3 Returning the device to the manufacturer..................................................................... 26
5.3.1 General information.............................................................................................................. 26
5.3.2 Form (for copying) to accompany a returned device............................................................ 27
5.4 Disposal .......................................................................................................................... 27
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CONTENTS
SMARTSENS PH 2390
6 Technical data 28
6.1 Measuring principle........................................................................................................28
6.1.1 pH measurement .................................................................................................................. 28
6.2 Technical data................................................................................................................. 30
6.3 Dimensions ..................................................................................................................... 32
7 Description of HART interface 33
7.1 General description ........................................................................................................33
7.2 Software history ............................................................................................................. 33
7.3 Connection variants........................................................................................................34
7.3.1 Point-to-Point connection - analogue / digital mode........................................................... 35
7.4 Inputs/outputs and HART® dynamic variables and device variables............................ 36
7.5 Field Communicator 475 (FC 475).................................................................................. 36
7.5.1 Installation ............................................................................................................................ 36
7.5.2 Operation............................................................................................................................... 37
7.6 Field Device Tool / Device Type Manager (FDT/DTM).................................................... 37
7.6.1 Installation ............................................................................................................................ 37
7.7 Overview Basic-DD menu tree (positions in menu tree) ............................................... 38
7.8 Basic-DD menu tree (details for settings) ..................................................................... 39
8 Appendix 42
8.1 pH as a function of mV.................................................................................................... 42
8.2 pH temperature dependency.......................................................................................... 43
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SMARTSENS PH 2390
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 the sensor SMARTSENS PH 2390 is the measurement of pH in liquids.
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.
SMARTSENS PH 2390
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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SMARTSENS PH 2390
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.
SMARTSENS PH 2390
Figure 2-1: Standard scope of delivery
1 Ordered sensor
2 Documentation
Optional accessories
• SENSOFIT FLOW 1000 series - Flow-through assemblies
• SENSOFIT IMM 1000 / 2000 series - Immersion assemblies
• SENSOFIT INS 1000 / 7000 series - Insertion assemblies
• SENSOFIT RET / RAM 5000 series - Manual and pneumatic retractable assemblies
• SMARTSENS cable VP 2.0 (various lengths)
• SMARTMAC 200 W - Wall mount display with calibration and configuration functions
• SD 200 W/R - Wall or rack mount indicator
• SMARTBRIDGE - USB interface cable
• SJB 200 W - Junction box
Consumables/Spare parts available
• pH buffer solutions for sensor calibration
• Various cleaning solutions
INFORMATION!
For further information contact your local sales office.
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SMARTSENS PH 2390
2.2 Device description
2.2.1 pH sensor
DEVICE DESCRIPTION 2
Figure 2-2: Construction of the sensor
1 VP 2.0 connector
2 3/4 - 14 NPT (male)
3 CPVC body
4 3/4 - 14 NPT (male)
5 Diaphragm
6 Protection cap
7 KCl solution
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2 DEVICE DESCRIPTION
2.3 Nameplate
Figure 2-3: Example for a nameplate on the sensor body
1 Manufacturer
2 Device name
3 Order code
4 Serial number
5 Approvals
6 Observe the operation and installation instruction
SMARTSENS PH 2390
INFORMATION!
Look at the device nameplate to ensure that the device is delivered according to your order.
The sensor type is specified on the label of the sensor package and on the sensor itself.
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SMARTSENS PH 2390
3.1 General notes on installation
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!
WARNING!
During installation of the device make sure that you use ESD (electronic discharge) protection
equippment.
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.
INSTALLATION 3
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.
3.2 Storage and transport
CAUTION!
Do not store the sensor tip dry. This will shorten lifetime considerably.
Always store the pH 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.
• Since the pH sensor is made out of glass it is very fragile. Avoid shocks of any kind.
• Do not touch or scratch the membrane glass.
• 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 24.
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3 INSTALLATION
3.3 Installation procedure
WARNING!
During installation of the device make sure that you use ESD (electronic discharge) protection
equippment.
Because a new pH 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 junction box or directly to the process control system.
3 Calibrate the sensor.
4 Install the sensor into its final measuring location.
The required steps are explained in the following sections.
3.4 Pre-installation requirements
SMARTSENS PH 2390
CAUTION!
•
Never touch or scratch the membrane glass 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 24
Figure 3-1: Handling the sensor
.
Unpacking the sensor
• Gently pull the protection cap from the sensor 1.
• Lay the sensor on a soft mat/tissue 2.
• Keep the protection cap in the original packaging 3.
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SMARTSENS PH 2390
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!
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.
INSTALLATION 3
INFORMATION!
Look at the device nameplate to ensure that the device is delivered according to your order.
3.5.1 Connecting the cable to the sensor
WARNING!
During installation of the device make sure that you use ESD (electronic discharge) protection
equippment.
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 3-2: Connecting the cable to the sensor
Connecting the cable to the sensor
• Ensure that both cable and sensor connector are absolutely dry 1.
• Screw the cable connector 2 on the sensor and tighten it by hand.
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3 INSTALLATION
3.5.2 Connecting the sensor cable
DANGER!
All work on the electrical connections may only be carried out with the power disconnected.
INFORMATION!
Look at the device nameplate to ensure that the device is delivered according to your order.
SMARTSENS cable VP 2.0
Black (inner coax shield) Ub+
White Ub-
3.5.3 Connecting with junction box SJB 200 W
SMARTSENS PH 2390
14
Figure 3-3: SJB 200 W with SMARTMAC 200 W and with resistance R (left side). SJB 200 W with SMARTMAC 200 W and
without resistance R (right side).
SJB 200 W with SMARTMAC 200 W and with
resistance R
B Sensor + A Sensor +
C Sensor - C Sensor -
D Display + (SMARTMAC 200 W) D Display + (SMARTMAC 200 W)
E Display - (SMARTMAC 200 W) E Display - (SMARTMAC 200 W)
F PLC - (process control system) F PLC - (process control system)
H PLC + (process control system) I PLC + (process control system)
SJB 200 W with SMARTMAC 200 W and
without resistance R
CAUTION!
´
t include the resistance R into the loop if a HART® isolation amplifier is used.
Don
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SMARTSENS PH 2390
Figure 3-4: SJB 200 W and SD 200 W/R (left side). SJB 200 W for HART® communication and with resistance R (right
side).
INSTALLATION 3
SJB 200 W and SD 200 W/R
SJB 200 W for HART® communication and
with resistance R
A Sensor + B Sensor +
C Sensor - C Sensor -
D Display + (SD 200 W/R) G PLC - (process control system)
E Display - (SD 200 W/R) H PLC + (process control system)
F PLC - (process control system)
I PLC + (process control system)
Figure 3-5: SJB 200 W for HART® communication without resistance R (left side). SJB 200 W (right side).
SJB 200 W for HART® communication and without
SJB 200 W
resistance R
A Sensor + A Sensor +
C Sensor - C Sensor -
G PLC - (process control system) G PLC - (process control system)
I PLC + (process control system) I PLC + (process control system)
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3 INSTALLATION
3.6 Installing the sensor
3.6.1 General installation instructions
The membrane glass 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 membrane glass. This would interrupt the electrical contact between the inner buffer
solution and the glass surface.
SMARTSENS PH 2390
Figure 3-6: Installation requirements
1 Measuring medium
2 Maximum deviation of 75° from vertical position
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SMARTSENS PH 2390
4.1 Calibration
OPERATION 4
4.1.1 Calibration with PACTware
Manual hold
• Start the function calibration
• Activate the function manual hold
• Select yes
• Press Next
yes.
yesyes
Next to proceed.
NextNext
Temperature compensation
• Set the temperature compensation
• Select between automatic
temperature compensation for calibration.
temperature compensationtemperature compensation
i If you have selected manual temperature compensation
the pH buffer solution. Default setting: 25°C / 77°F.
• Press Next
Next to proceed.
NextNext
Start calibration procedure
• Dip the sensor into the first pH buffer solution 1 and wait till the value is stable.
• Press Next
Next to proceed.
NextNext
i The measurement of pH buffer solution 1
After approx. 10 seconds the following values appear:
pH value
temperature value
Indentified buffer value
calibration in menu mode Quick Setup
calibrationcalibration
manual hold to avoid an alarm.
manual holdmanual hold
automatic or manual
automaticautomatic
TM
Quick Setup or Setup
Quick SetupQuick Setup
manual.
manualmanual
manual temperature compensation, please enter the temperature of
manual temperature compensationmanual temperature compensation
pH buffer solution 1 starts and the values pH and temperature appear.
pH buffer solution 1pH buffer solution 1
Setup.
SetupSetup
• Press Next
• Press Next
Next to confirm the identified pH buffer solution. If neccessary change the value of the
NextNext
pH buffer solution manually. If the sensor does not recognise the pH buffer solution the
message buffer not recognised
buffer not recognised appears.
buffer not recognisedbuffer not recognised
Next to proceed.
NextNext
i The value 0 for the pH buffer solution appears. Enter the value of the pH buffer solution
manually.
• Press Next
• Clean the sensor with demineralised water 2.
Next to proceed with the calibration procedure.
NextNext
Figure 4-1: Calibration procedure
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4 OPERATION
• Dip the sensor into the second pH buffer solution 3 and wait till the value ist stable.
• Press Next
i The measurement of pH buffer solution 2
Next to proceed.
NextNext
After approx. 10 seconds the following values appear:
pH value
temperature value
Indentified buffer value
SMARTSENS PH 2390
pH buffer solution 2 starts and the values pH and temperature appear.
pH buffer solution 2pH buffer solution 2
• Press Next
• Press Next
Next to confirm the identified pH buffer solution. If neccessary change the value of the
NextNext
pH buffer solution manually.
If the sensor does not recognise the pH buffer solution the message buffer not recognised
appears.
Next to proceed.
NextNext
buffer not recognised
buffer not recognisedbuffer not recognised
i The value 0 for the pH buffer solution appears. Enter the value of the pH buffer solution
manually.
• Press Next
• Clean the sensor with demineralised water 2.
Next to proceed with the calibration procedure.
NextNext
i After a successful calibration the following values appear:
Buffer solution 1
Buffer solution 2
Offset in mV
Slope in mV/pH
• Press Next
• Set the calibration date with DD-MM-YYYY and calibration time with HH-MM-SS
• Press Next
i The message Save values?
• Select yes
• Press Next
• Select no
• Press Next
Next to proceed.
NextNext
Next to proceed.
NextNext
Save values? appears.
Save values?Save values?
yes to save the values.
yesyes
Next to proceed.
NextNext
no to deactivate the function manual hold
nono
Next to leave the calibration menu.
NextNext
manual hold.
manual holdmanual hold
A pH calibration is necessary in regular intervals or when installing a new pH sensor.
If the calibration was not successful, the message Warning! Offset out of range!
the value Offset
In case the value of the slope is not plausible, addionally the message No saving possible
appears.
• Press Next
i The messages Warning! Offset out of range!
• Press Next
• Set the calibration date with DD-MM-YYYY and calibration time with HH-MM-SS
• Press Next
i The message Save values?
• Select between yes
• Press Next
• Select no
• Press Next
If the message Warning! Slope out of range!
possible
possible, no data can be saved.
possiblepossible
Offset and/or the message Warning! Slope out of range!
OffsetOffset
Next to proceed.
NextNext
Warning! Offset out of range! or Warning! Slope out of range!
Warning! Offset out of range!Warning! Offset out of range!
Next to proceed.
NextNext
Next to proceed.
NextNext
Save values? appears.
Save values?Save values?
yes or no
no.
yesyes
nono
Next to proceed.
NextNext
no to deactivate the function manual hold
nono
Next to leave the calibration menu.
NextNext
Warning! Slope out of range! appears together with the message No saving
Warning! Slope out of range!Warning! Slope out of range!
Warning! Slope out of range! behind the value Slope
Warning! Slope out of range!Warning! Slope out of range!
manual hold.
manual holdmanual hold
Warning! Offset out of range! appears behind
Warning! Offset out of range!Warning! Offset out of range!
Slope.
SlopeSlope
No saving possible
No saving possibleNo saving possible
Warning! Slope out of range! appear.
Warning! Slope out of range!Warning! Slope out of range!
No saving
No saving No saving
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SMARTSENS PH 2390
OPERATION 4
• Press Next
• Select no
• Press Next
In a fully functional sensor, the optimal slope is -59 mV for each pH unit and the optimal zero
point is 0 mV at pH 7. The slope should at least have a value between -50...-65 mV per pH unit.
Re-calibrate the sensor if the slope does not approximate those limits. The pH sensor ages, the
slope gets flatter and the zero error increases.
Next to proceed.
NextNext
no to deactivate the function manual hold
nono
Next to leave the calibration menu.
NextNext
manual hold.
manual holdmanual hold
CAUTION!
•
Never touch or scratch the pH sensitive glass tip of the sensor.
•
Make sure that the sensor tip is clean and dust-free. If necessary, clean the tip as described
on page 24
.
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).
4.1.2 Calibration with HART® Handheld 475 FIELD COMMUNICATOR
Manual hold
• Start the function calibration
• Activate the function manual hold
• Select Yes
• Press Enter
Yes.
YesYes
Enter to proceed.
EnterEnter
calibration in menu mode Quick Setup
calibrationcalibration
manual hold to avoid an alarm.
manual holdmanual hold
Quick Setup or Setup
Quick SetupQuick Setup
Setup.
SetupSetup
Temperature compensation
• Set the temperature compensation
• Select between automatic
i If you have selected manual temperature compensation
• Press Enter
temperature compensation for calibration.
temperature compensationtemperature compensation
automatic or manual
automaticautomatic
the pH buffer solution. Default setting: 25°C / 77°F.
Enter to proceed.
EnterEnter
manual.
manualmanual
manual temperature compensation, please enter the temperature of
manual temperature compensationmanual temperature compensation
Start calibration procedure
• Dip the sensor into the first pH buffer solution 1 and wait till the value is stable.
• Press Ok
i The measurement of pH buffer solution 1
• Press Ok
• Press Enter
Ok to proceed.
OkOk
pH buffer solution 1 starts and the values pH and temperature appear.
pH buffer solution 1pH buffer solution 1
After approx. 10 seconds the following values appear:
pH value
temperature value
Status buffer detection → Finished
Value indentified buffer
Ok to confirm the identified pH buffer solution. If neccessary change the value of the pH
OkOk
buffer solution manually.
Enter to proceed.
EnterEnter
i If the sensor does not recognise the pH buffer solution the messages
Identified buffer
Identified buffer → 0 pH
Identified buffer Identified buffer
• Press Ok
Ok to proceed.
OkOk
0 pH and Buffer not recognised
0 pH 0 pH
Buffer not recognised appear.
Buffer not recognisedBuffer not recognised
i Enter the value of the pH buffer solution manually.
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4 OPERATION
SMARTSENS PH 2390
• Press Enter
• Clean the sensor with demineralised water 2.
Figure 4-2: Calibration procedure
• Dip the sensor into the second pH buffer solution 3 and wait till the value is stable.
• Press Ok
i The measurement of pH buffer solution 2
Enter to proceed with the calibration procedure.
EnterEnter
Ok to proceed.
OkOk
pH buffer solution 2 starts and the values pH and temperature appear.
pH buffer solution 2pH buffer solution 2
After approx. 10 seconds the following values appear:
pH value
temperature value
Status buffer detection → Finished
Value indentified buffer
• Press Ok
• Press Enter
Ok to confirm the identified pH buffer solution. If neccessary change the value of the pH
OkOk
buffer solution manually.
Enter to proceed.
EnterEnter
i If the sensor does not recognise the pH buffer solution the messages
Identified buffer
Identified buffer → 0 pH
Identified buffer Identified buffer
• Press Ok
Ok to proceed.
OkOk
0 pH and Buffer not recognised
0 pH 0 pH
Buffer not recognised appear.
Buffer not recognisedBuffer not recognised
i Enter the value of the pH buffer solution manually.
• Press Enter
• Clean the sensor with demineralised water 2.
Enter to proceed with the calibration procedure.
EnterEnter
i After a successful calibration the following values appear:
Buffer solution 1
Buffer solution 2
Offset in mV
Slope in mV/pH
• Press Ok
• Set the calibration date with MM-DD-YYYY. Press the key > to enter the submenu. Now you can
• Press Enter
i The message save the values?
• Select yes
• Press Enter
Ok to proceed.
OkOk
change the calibration date.
Enter and Ok
EnterEnter
yes to save the values.
yesyes
Enter to proceed.
EnterEnter
Ok to proceed.
OkOk
save the values? appears.
save the values?save the values?
20
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SMARTSENS PH 2390
OPERATION 4
• Select no
• Press Enter
A pH calibration is necessary in regular intervals or when installing a new pH sensor.
If the calibration was not successful, the message Warning!
and/or Slope
• Press Ok
• Set the calibration date with MM-DD-YYYY. Press the key > to enter the submenu. Now you can
• Press Enter
i The messages Warning! Offset out of range!
• Select between yes
• Press Enter
• Select No
• Press Enter
If the message ATTENTION! Slope out of range!
• Press Ok
• The message No saving possible
• Press Ok
• Select no
• Press Next
no to deactivate the function manual hold
nono
Enter to leave the calibration menu.
EnterEnter
Slope.
SlopeSlope
Ok to proceed.
OkOk
change the calibration date.
Enter and Ok
EnterEnter
values?
values? appear.
values?values?
Enter to proceed.
EnterEnter
No to deactivate the function manual hold
NoNo
Enter to leave the calibration menu.
EnterEnter
Ok to proceed.
OkOk
Ok to proceed.
OkOk
no to deactivate the function manual hold
nono
Next to leave the calibration menu.
NextNext
Ok to proceed.
OkOk
Warning! Offset out of range! and/or Warning! Slope out of range!
Warning! Offset out of range!Warning! Offset out of range!
yes or no
no.
yesyes
nono
ATTENTION! Slope out of range! appears, no data can be saved.
ATTENTION! Slope out of range!ATTENTION! Slope out of range!
No saving possible appears.
No saving possibleNo saving possible
manual hold.
manual holdmanual hold
manual hold.
manual holdmanual hold
manual hold.
manual holdmanual hold
Warning! appears behind the values Offset
Warning!Warning!
Warning! Slope out of range! and Save
Warning! Slope out of range!Warning! Slope out of range!
Offset
OffsetOffset
Save
Save Save
In a fully functional sensor, the optimal slope is -59 mV for each pH unit and the optimal zero
point is 0 mV at pH 7. The slope should at least have a value between -50...-65 mV per pH unit.
Re-calibrate the sensor if the slope does not approximate those limits. The pH sensor ages, the
slope gets flatter and the zero error increases.
CAUTION!
•
Never touch or scratch the pH sensitive glass tip of the sensor.
•
Make sure that the sensor tip is clean and dust-free. If necessary, clean the tip as described
on page 24
.
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).
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4 OPERATION
4.2 Troubleshooting
Problem Possible cause Remedy
SMARTSENS PH 2390
The pH sensor
does not deliver a
signal.
The pH sensor
delivers an
unstable signal.
High pH value Air bubble in the sensor
Mechanical damage of the
glass, e.g. small cracks.
This will shortcut the ion
exchange and deliver a pH
7 reading.
Open circuit Check the cable wiring of the sensor cable on the junction box.
The diaphragm in the
reference half cell does
not provide good contact
to the process medium
due to drying up or
coatings.
tip (no inner buffer
solution)
Exchange sensor.
Otherwise connect the sensor to the primary master e.g.
PACTware
damage.
TM
FTD/DTM or to the HART® handheld to exclude a sensor
• Clean the diaphragm with hot soap or acid using a soft tissue
(details on page 24).
• 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.
Protect the sensor tip with a protection cap as descriped on page 12.
Hold the sensor into a vertical position and help by rapid movements
of the wrist to shake the liquid down. Remove the protection cap and
check if there is still an air bubble inside the sensor tip. If necessary,
repeat this procedure one more time.
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SMARTSENS PH 2390
4.3 Status messages and diagnostic information
Measurements out of specification
Message
Message Description
MessageMessage
S01 pH value > pH max
S02 pH value < pH min
S03 Temp. value > Temp max
S04 Temp. value < Temp min
Failure
Message
Message Description
MessageMessage
F01 Glass resistance > max. MOhm Replace the sensor
Description Action
DescriptionDescription
pH value out of range
pH value out of range
Temperature value out of range
Temperature value out of range
Description Action
DescriptionDescription
Action
ActionAction
Consider the measuring range limits, otherwise
select a suitable sensor for the process conditions of
the application.
Action
ActionAction
OPERATION 4
F02 Glass resistance < min. MOhm
Maintenance
Message
Message Description
MessageMessage
M01 Slope < -65 mV/pH Recalibrate the sensor. For more information refer
M02 Slope > -50 mV/pH
M03 Zero point < -99 mV
M04 Zero point > +99 mV
M05 Maintenance interval expired
Description Action
DescriptionDescription
Action
ActionAction
to
Calibration with PACTwareTM
on page 17
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5 SERVICE
5.1 Maintenance
5.1.1 Cleaning
INFORMATION!
Recalibrate the sensor after each cleaning procedure
• 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
SMARTSENS PH 2390
During operation, but already during storage, pH sensors age due to poisoning effects of the
inner buffer system. Therefore it is important to re-calibrate the sensor in regular intervals.
Consider status messages and diagnostic information.
When the sensor becomes too old to provide reliable measurements, an error message (see on
page 17) appears after the calibration procedure. In this case, the sensor has to be replaced.
Aging effects of sensor:
Aging effects of sensor:
Aging effects of sensor:Aging effects of sensor:
• Decrease of slope
Decrease of slope due to abrasion, drying, corrosion of glass tip coating and leaching:
Decrease of slopeDecrease of slope
The slope should be < -50 mV/pH. An optimal value is -59 mV/pH at 25°C/ 77°F. When the
slope rises above -50 mV/pH, an error message is displayed and the sensor has to be
replaced.
The slope of the sensor is displayed after each calibration procedure.
• Shift of zero point
Shift of zero point due to strong temperature changes, leaching and contamination of
Shift of zero pointShift of zero point
reference half cell or increased resistance between glass tip and reference half cell:
The zero point should lie between -58...+58 mV at pH 7.
An optimal value is 0 mV at pH 7.
The zero point of the sensor is displayed after each calibration procedure.
24
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SMARTSENS PH 2390
Figure 5-1: Aging effects of sensor
1 Horizontal shift of slope
2 Vertical shift of slope
3 Decrease of slope
SERVICE 5
INFORMATION!
The lifetime expectation depends heavily on the application. The right choice of the sensor type is
very important.
5.2 Availability of services
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
5.3 Returning the device to the manufacturer
5.3.1 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.
SMARTSENS PH 2390
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SMARTSENS PH 2390
5.3.2 Form (for copying) to accompany a returned device
Company: Address:
Department: Name:
Tel. no.: Fax no.:
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:
5.4 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 pH measurement
SMARTSENS PH 2390
Figure 6-1: Measuring principle for pH measurement
1 Reference electrode
2 Measuring electrode
3 Diaphragm in contact with KCl solution and measuring medium
4 Inner pH 7 buffer solution
5 Surface potential on the inside (contact with buffer solution)
6 pH sensitive glass (membrane glass)
7 Surface potential on the outside (contact with measuring medium)
8 Measuring medium
The measuring principle of a pH sensor is based on a pH sensitive glass (membrane glass).
When the pH sensitive glass gets into contact with a liquid, a thin layer of hydrated gel develops
on the surface, enabling an ion exchange between the glass surface and the liquid. The so-called
Nernst potential builds up on the glass surface. If both sides of the glass are in contact with
liquids, a voltage may be detected between the two surface potentials. The voltage correlates to
+
the difference in H
ion concentration and thus to the difference of pH values in both liquids.
The pH sensor contains an internal buffer solution with a known pH value. If the pH value of the
measuring medium on the outside of the sensor is equal to the pH value of the inner buffer, the
resulting voltage is 0 V.
If the pH value of the medium differs from the internal pH value, a voltage between the internal
and the external layer can be measured. From the resulting voltage, the pH difference of the two
liquids can be calculated.
28
The voltage is measured using a measuring electrode and a reference electrode; both are built
into the sensor. The measuring electrode is in contact with the known buffer solution in the pH
sensitive glass bulb. The reference electrode is immersed into a saturated solution of potassium
chloride (KCl). The KCl solution itself is in electrical contact with the measuring medium by
means of a diaphragm. The diaphragm prevents the measuring medium from penetrating into
the reference system but still allows electrical contact with the measuring medium.
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SMARTSENS PH 2390
The voltage change of a pH sensor at 25°C/ 77°F is around -59 mV for each pH unit. This is also
called the slope of the pH sensor. The slope is temperature dependent and decreases over life
time of the sensor.
TECHNICAL DATA 6
Figure 6-2: Optimal slope at 25°C/ 77°F
To compensate for the temperature dependency of the pH measurement, the temperature of the
medium can be measured and automatically compensated.
Figure 6-3: Temperature dependency of the slope
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6 TECHNICAL DATA
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).
Measuring system
Measuring principle Potentiometric
Measuring range 0…14 pH
Design
Shaft diameter 20 mm / 0.79"
Insertion length 23 mm / 0.9"
Temperature sensor Pt1000
Connector VarioPin 2.0 (VP 2.0)
SMARTSENS PH 2390
Operating conditions
Temperature range 0...+80°C / +32...+176°F
Process pressure 6.9 bar at +60°C / 100 psi at +140°F
Measuring accuracy 0.5%
Conductivity Min. 150 µS/cm
Installation conditions
Ingress protection IP 68
Weight Approx. 193 g / 0.43 lb
Process connection 3/4" MNPT
Materials
Sensor shaft
Membrane glass Multi purpose glass
Inner buffer pH 7.0
Reference KCl gel double junction
Diaphragm PTFE
Sensor head Nickel plated brass body with VP 2.0 connector
Ryton
®
30
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SMARTSENS PH 2390
Communication
pH range 0...14 pH
Resolution pH range 0.02 pH
Output signal 4...20 mA (passive)
Output resolution 20 µA
Field communication
Filter adjustable 1...60 seconds
Electrical connections
Power supply 15...30 VDC loop powered
Measuring range
Load Minimum 0 Ω; maximum RL = ((U
Error signal Acc. to NAMUR NE 43
®
HART
Device revision 1
Physical layer FSK
Device category Sensor, galvanically isolated
System requirements
Multidrop operation 4 mA
TECHNICAL DATA 6
HART® 7 - FSK 1200 physical layer definition on top of the current loop
4...20 mA + HART® protocol
- 15 VDC) / 22 mA)
ext.
Upper value: ≥ 21.0 mA
HART® protocol via current output
250 Ω loop resistance for HART® communication
Approvals
CE This device fulfils the statutory requirements of the EC directives. The
CSA
manufacturer certifies successful testing of the product by applying the CE
mark.
Shock resistance:
IEC 60068-2-31, Environmental testing – Part 2: Test Ec
Electromagnetic compatibility:
Acc. to EN 61326, NAMUR NE 21
Low voltage directive:
Safety requirements for electrical equipment for measurement, control, and
laboratory use in accordance with EN 61010-1:2001
INFORMATION!
For further information contact your local sales office.
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6 TECHNICAL DATA
6.3 Dimensions
Figure 6-4: SMARTSENS PH 2390 with VP 2.0
a Ø 33 Ø 1.3
b 3/4" MNPT
c 24 0.94
d 128 5.04
e 34 1.34
SMARTSENS PH 2390
Dimensions [mm] Dimensions [inch]
32
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SMARTSENS PH 2390
7.1 General description
The open HART® protocol, which can be used for free, is integrated into the sensor for
communication.
Devices which support the HART
devices. When it comes to operating devices (Master), both manual control units (Secondary
Master) and PC-supported workstations (Primary Master) are used in, for example, a control
centre.
®
HART
devices range from 2-wire to intrinsically safe versions for use in hazardous areas.
The HART
all of the connected devices can communicate digitally with one another via the HART
while simultaneously transmitting the analogue signals.
When it comes to the field devices and secondary masters, the FSK or HART
integrated. If a PC is used, an external modem must be connected to the serial interface
(USB interface). There are, however, other connection variants which can be seen in the
following connection figures.
field devices include measuring sensors, signal converters and actuators. The field
®
data are superimposed over the analogue 4...20 mA signal via FSK modem. This way,
DESCRIPTION OF HART INTERFACE 7
®
protocol are classified as either operating devices or field
®
protocol
®
modem is
7.2 Software history
INFORMATION!
In the table below, "x" is a placeholder for possible multi-digit alphanumeric combinations,
depending on the available version.
Release date SW version HW version
2013-04-01 1.0.x 1.0.x 1 1
HART® identification codes and revision numbers
Manufacturer ID: 69 (0x45)
Device: 195 (0xC3)
Device Revision: 1
DD Revision: 1
HART® Universal Revision:
FC 475 system SW.Rev.: ≥ 3.7
PDM version: ≥ 8.0
FDT version: ≥ 1.2
®
HART
Device Revision DD Revision
7
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7 DESCRIPTION OF HART INTERFACE
7.3 Connection variants
The sensor is a 2-wire device with a passive 4...20 mA current output and HART® interface.
• Multidrop mode is supported
Multidrop mode is supported
Multidrop mode is supportedMultidrop mode is supported
In a multidrop communication system, more than 2 devices are connected to a common
transmission cable.
• Burst mode is not supported
Burst mode is not supported
Burst mode is not supportedBurst mode is not supported
In the burst mode a slave device transfers cyclic pre-defined response telegrams, to get a
higher rate of data transfer.
INFORMATION!
For detailed information about the electrical connection of the sensor for HART
Connecting with junction box SJB 200 W on page 14
®
There are two ways of using the HART
• as Point-to-Point connection and
• as Multidrop connection, with 2-wire connection.
communication:
SMARTSENS PH 2390
®
, refer to
.
34
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SMARTSENS PH 2390
DESCRIPTION OF HART INTERFACE 7
7.3.1 Point-to-Point connection - analogue / digital mode
Point-to-Point connection between the sensor and the HART® Master.
The current output of the device is passive.
Figure 7-1: Point- to-Point connection
®
DD
TM
FDT/DTM
1 Primary master with e.g. PACTware
2 FSK modem
3 HART
4 SD 200 W/R or SMARTMAC 200 W (optional)
5 Sensor
6 Secondary master with HART
7 Power supply for devices (slaves) with passive current output
8 Load ≥ 250 Ω (Ohm)
®
signal
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7 DESCRIPTION OF HART INTERFACE
SMARTSENS PH 2390
7.4 Inputs/outputs and HART® dynamic variables and device variables
HART® dynamic variable
PV SV TV QV
pH Electrode voltage Temperature Resistance
Code = device variable code
Device variables
HART® device variable
pH value 0 linear
Electrode voltage 1 linear
Temperature 2 linear
Resistance 3 linear
The HART® dynamic variable PV is always connected to the HART® current output which is
assigned to the pH value.
Code Type
7.5 Field Communicator 475 (FC 475)
The Field Communicator is a hand terminal from Emerson Process Management that is
®
designed to configure HART
used to integrate different devices into the Field Communicator.
7.5.1 Installation
The HART® Device Description for the sensor must be installed on the Field Communicator.
Otherwise only the functions of a generic DD are available to the user and the entire device
control is not possible. A "Field Communicator Easy Upgrade Programming Utility" is required to
install the DDs on the Field Communicator.
and Foundation Fieldbus devices. Device Descriptions (DDs) are
36
The Field Communicator must be equipped with a system card with "Easy Upgrade Option". For
details consult the Field Communicator User’s Manual.
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SMARTSENS PH 2390
DESCRIPTION OF HART INTERFACE 7
7.5.2 Operation
INFORMATION!
For more detailed information (see on page 38
Operating the sensor via the Field Communicator is very similar to manual device control using
the keyboard.
Limitation: The service menu parameters for the senor are supported but a simulation for the
current output is not possible.
Parameter protection for custody transfer is the same as on the SMARTMAC 200 W display.
Other specific protective functions such as the passwords for the quick setup menu and the
setup menu are not supported with HART
), Menu tree for Basic DD.
®
.
7.6 Field Device Tool / Device Type Manager (FDT/DTM)
A Field Device Tool Container (FDT Container) is basically a PC program used to configure a field
®
device via HART
Manager (DTM).
. To adapt to different devices, the FDT container uses a so-called Device Type
7.6.1 Installation
If the DTM for the sensor has not yet been installed on the FDT Container, setup is required and
is available for download from the website or on CD-ROM. See the supplied documentation for
information on how to install and set up the DTM.
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7 DESCRIPTION OF HART INTERFACE
7.7 Overview Basic-DD menu tree (positions in menu tree)
Main menu Submenu
1 Measuring value
1 Measuring value 1 pH value
1 Measuring value1 Measuring value
2 Temperature
3 Electrode voltage
4 Loop current
5 Error
6 Device state
2 Quick setup
2 Quick setup 1 TAG
2 Quick setup2 Quick setup
2 Manual hold
3 I/O
4 Calibration
5 Autoclaving counter
6 Input user password
3 Logbook
3 Logbook 1 Calibration logbook
3 Logbook3 Logbook
2 Error logbook
4 Setup
4 Setup 1 Process input
4 Setup4 Setup
2 I/O
3 I/O HART
4 Device
5 Service
5 Service 1 Service calibration
5 Service5 Service
2 Service parameter
3 Passwords
4 Sensor lock
®
SMARTSENS PH 2390
38
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SMARTSENS PH 2390
DESCRIPTION OF HART INTERFACE 7
7.8 Basic-DD menu tree (details for settings)
1 Measuring value
1 pH value
2 Temperature Display of the measured temperature value in °C / °F on process control
3 Electrode voltage Display of the measured electrode voltage in mV on process control system,
4 Loop current Display of the measured loop current in mA on process control system,
5 Error Display of status messages and diagnostic information. For further
6 Device state Display of status information icon for sensor according to NAMUR NE 107.
2 Quick setup
1 TAG Set the TAG number for the measuring loop.
2 Manual hold Activate or deactivate the manual hold function. Select between yes or no.
3 I/O Meas. value at 4 mA Set measuring value at 4 mA;
4 Calibration Start calibration procedure. For more information refer to
5 Autoclaving counter Rise autoclaving counter (yes/no)
6 Input user password Set password
Display of the measured pH value on process control system, HART®
handheld or display.
®
system, HART
®
handheld or display.
HART
®
handheld or display.
HART
information refer to
Meas. value at 20 mA Set measuring value at 20 mA;
Time constant Set time constant (1…60 seconds);
page 17.
handheld or display.
Status messages and diagnostic information
Default setting: pH 0
Default setting: pH 14
Default setting: 1 second
on page 23.
Calibration
on
3 Logbooks
1 Calibration logbook Logbook for the last 20 calibration cycles
2 Error logbook Display errors
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7 DESCRIPTION OF HART INTERFACE
4 Setup
1 Process input Temperature Set temperature unit °C / °F
Calibration Start calibration procedure. For more information
Maintenance interval Set maintenance interval in days (000...999 days);
Reset maintenance
interval
2 I/O Meas. value at 4 mA Set measuring value at 4 mA;
Meas. value at 20 mA Set measuring value at 20 mA;
Time constant Set time constant (1…60 seconds);
3 I/O HART TAG Set TAG for measuring loop
Message Display messages (32 packed ASCII)
Polling address Display polling address
Loop current mode Select between enable or disable to activate or
Device variables PV Display PV - pH with
SMARTSENS PH 2390
Set temperature offset
Display date of offset calibration
Set temperature compensation
(automatic/manual); Default setting: automatic
Set temperature value 5...50°C/41...122°F (only if
manual temperature compensation is activated;
Default setting: 25°C/77°F )
refer to
Default setting: 000
Yes / No; Default setting: No
Default setting: pH 0
Default setting: pH 14
Default setting: 1 second
Set long TAG
Display of previous long TAG
deactivate the loop current mode
SV Display SV - electrode
TV Display TV -
QV Display QV - resistance
Calibration
on page 17
min. and max. limits
voltage in mV
temperature in °C / °F
with min. and max.
limits
40
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SMARTSENS PH 2390
4 Device Information Sensor information Order code
DESCRIPTION OF HART INTERFACE 7
Calibration Slope
Operating parameters
(OP)
Commissioning Set date of commissioning
Device name
Serial number
HART® ID
Polling address
Manufacturer ID
Date of manufacturing
SW version
HW version
Offset
Inner buffer
Buffer solution 1
Buffer solution 2
No. of calibrations
SIP counter
CIP counter
Autoclaving counter
Commissioning date
Operating hours
OP time > 80°C / 176°F
OP time > 110°C / 230°F
OP time < -300mV
OP time > +300mV
Max. temperature
Temp. compensation
Manual temp.
5 Service
1 Service calibration Trimming at 4 mA (+/-)
Trimming at 20 mA (+/-)
2 Service parameter Reset of sensor
Load factory setting
3 Password Password protection Activate or deactivate the password protection.
Password operator Set password for operator
Password
administrator
Reset password Reset all passwords (only administrator)
4 Sensor lock Select between YES
If you select YES
invalid for use. The HART
YES or NO
YESYES
YES the setting is not reversible anymore and the sensor is
YESYES
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Select between on and off.
Set password for administrator
NO to lock the sensor.
NONO
®
communication is not possible anymore.
41
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8 APPENDIX
8.1 pH 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 sensor and the corresponding pH value is directly
calculated by the sensor.
SMARTSENS PH 2390
+
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
42
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SMARTSENS PH 2390
8.2 pH temperature dependency
The output from a pH sensor 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 8
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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