KROHNE PH-8500 User Manual

Handbook

OPTISENS PH 8500

OPTISENS PH 8500OPTISENS PH 8500

HandbookHandbook

pH sensor

The documentation is only complete when used in combination with the relevant documentation for the signal converter.

: IMPRINT :::::::::::::::::::::::::::::::::::::::

Subject to change without notice.

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OPTISENS PH 8500

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 electrodes.......................................................................................................................... 9

2.3 Nameplate ...................................................................................................................... 10

3 Installation 11

3.1 Notes on installation ......................................................................................................11

3.2 Storage and transport .................................................................................................... 11

3.3 Installation procedure .................................................................................................... 12

3.4 Pre-installation requirements ....................................................................................... 13

3.5 Electrical connection......................................................................................................13

3.5.1 Connecting the sensor cable to the signal converter .......................................................... 14

3.5.2 Connecting the external temperature sensor...................................................................... 15

3.5.3 Connecting the cable to the sensor...................................................................................... 16

3.6 Calibrating the electrode................................................................................................ 16

3.7 Installing the sensor....................................................................................................... 17

3.7.1 General installation instructions.......................................................................................... 17

3.7.2 Mounting to a flow-through holder ...................................................................................... 18

3.7.3 Mounting to SENSOFIT IMM 1000 immersion holder .......................................................... 19

3.8 Installing an external temperature sensor.................................................................... 21

3.9 Examples of a typical measuring point.......................................................................... 22

4 Operation 23

4.1 Menu mode structure..................................................................................................... 23

4.2 Function tables ............................................................................................................... 25

4.2.1 Menu A, quick setup.............................................................................................................. 25

4.2.2 Menu B, test .......................................................................................................................... 26

4.2.3 Menu C, setup ....................................................................................................................... 27

4.3 Calibration ...................................................................................................................... 29

4.3.1 Temperature compensation .................................................................................................29

4.3.2 Calibrating pH measurement ...............................................................................................33

4.3.3 Calibration log....................................................................................................................... 38

4.4 Troubleshooting.............................................................................................................. 38

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CONTENTS

OPTISENS PH 8500

5 Service 39

5.1 Maintenance ................................................................................................................... 39

5.1.1 Cleaning ................................................................................................................................ 39

5.1.2 Aging and re-calibration ....................................................................................................... 39

5.2 Spare parts availability...................................................................................................40

5.3 Availability of services .................................................................................................... 40

5.4 Returning the device to the manufacturer..................................................................... 41

5.4.1 General information.............................................................................................................. 41

5.4.2 Form (for copying) to accompany a returned device............................................................ 42

5.5 Disposal .......................................................................................................................... 42

6 Technical data 43

6.1 Measuring principle........................................................................................................43

6.1.1 pH measurement .................................................................................................................. 43

6.2 Technical data................................................................................................................. 45

6.3 Dimensions ..................................................................................................................... 47

7 Appendix 49

7.1 pH as a function of mV.................................................................................................... 49

7.2 pH temperature dependency.......................................................................................... 50

8 Notes 51

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OPTISENS PH 8500

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 PH 8500 sensor is the measurement of pH 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 PH 8500

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 PH 8500

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 PH 8500

Figure 2-1: Standard scope of delivery

1 Ordered sensor 2 Documentation

Optional accessories

• SENSOFIT FLOW 1000 - flow through holder

• SENSOFIT IMM 1000 - immersion holder

• SENSOFIT INS 1000 - insertion screw in adapter

• SENSOFIT RET 1000/2000 - retractable holder (in preparation)

• Cable pH/ORP-W Sensor Coax 5 m (16.5 ft) / 10 m (33 ft)

• Cable pH/ORP-W Sensor SixPlug with temp. wire 5 m (16.5 ft) / 10 m (33 ft)

Consumables/Spare parts available

• 250 ml pH buffer solutions pH4/pH7

• OPTISENS PH 8500 with DIN Coax connector

• OPTISENS PH 8500 with SixPlug connector and integrated temperature sensor Pt100

(in preparation)

INFORMATION!

For further information contact your local sales office.

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OPTISENS PH 8500

2.2 Device description

2.2.1 pH electrodes

DEVICE DESCRIPTION 2

Figure 2-2: Sensor types

1 Cable connector DIN Coax or SixPlug 2 O-ring (only for DIN Coax) 3 PG 13.5 thread 4 O-ring 5 Washer 6 Glass 7 Ceramic diaphragm 8 pH sensitive glass

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2 DEVICE DESCRIPTION

The OPTISENS PH 8500 is manufactured using a pH sensitive special glass which can be used in almost all standard water applications due to its wide measuring range.

The pH electrodes are available with different diaphragms:

OPTISENS PH 8500

Figure 2-3: Diaphragm types

1 Reference electrode 2 KCl solution 3 Inner pH 7 buffer solution 4 Measuring electrode 5 PTFE diaphragm 6 Ceramic diaphragm 7 open diaphragm

pH electrode with open diaphragm and Pt100

pH electrode with open diaphragm and Pt100pH electrode with open diaphragm and Pt100 open diaphragm (microscopically small hole in the glass); integrated Pt100 temperature measurement; suitable for cooling water, waste water and chemical industry applications.

pH electrode with ceramic diaphragm

pH electrode with ceramic diaphragmpH electrode with ceramic diaphragm Ceramic diaphragm; suitable for drinking water and pool industry applications.

pH electrode with PTFE diaphragm

pH electrode with PTFE diaphragmpH electrode with PTFE diaphragm Dirt-repellent teflon diaphragm; suitable for waste water, surface water and process water applications.

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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OPTISENS PH 8500

3.1 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 electrode tip dry. This will shorten lifetime considerably. Always store the pH electrode 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 electrode tip was delivered contains a plastic tube with KCl solution and therefore is suitable for storage and transport (see following drawing).

INSTALLATION 3

• Since the pH electrode is made out of glass it is very fragile. Avoid shocks of any kind.

• Do not touch or scratch the pH sensitive glass tip of the electrode.

• Store the electrode in its original packaging in a dry, dust-free location. Keep it away from

dirt. If necessary, clean it as described on page 39.

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3 INSTALLATION

Figure 3-1: pH electrode in its original packaging

1 Padding 2 Plastic tube filled with 3 molar KCl solution 3 pH electrode 4 O-ring 5 Washer 6 Protective cap over electrical connector 7 Sealing cap without hole to seal plastic tube 2 when electrode is in use

Storing the electrode 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 electrode tip through the hole in the storage cap (see drawing on page 13).

• Carefully push the O-ring delivered with the storage cap on the electrode so that the cap sits

over the O-ring.

• Insert the electrode tip into the plastic tube until it is fully covered with KCl solution.

• Tighten the cap.

• Store the electrode in its original packaging.

OPTISENS PH 8500

3.3 Installation procedure

Because a new pH electrode needs to be calibrated before it is installed into its final measuring location, it is important to follow the installation order:

1. Unpack the electrode.

2. Connect the electrode to the signal converter.

3. Calibrate the electrode.

4. Install the electrode into its final measuring location.

The required steps are explained in the following sections.

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OPTISENS PH 8500

3.4 Pre-installation requirements

CAUTION!

•

Never touch or scratch the pH sensitive glass tip of the electrode.

•

Make sure that the glass tip is clean and dust-free. If necessary, clean the tip as described on page 39

INSTALLATION 3

Figure 3-2: Handling the electrode

Unpacking the electrode

• Loosen the storage cap which is screwed or/and pushed on to the plastic tube 1.

• Gently pull the electrode out of the plastic tube 2.

• Lay the electrode 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!

All work on the electrical connections may only be carried out with the power disconnected. Take note of the voltage data on the nameplate!

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.

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.

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3 INSTALLATION

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. Check for the correct supply voltage printed on the nameplate.

OPTISENS PH 8500

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 pH electrodes are available with or without internal Pt100 temperature sensor. Electrodes without internal Pt100 temperature sensor are connected to the signal converter using a coax cable. Electrodes with internal temperature sensor use a SixPlug 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 PH 8500 with coax cable (without internal Pt100/1000)

OPTISENS PH 8500 with coax cable (without internal Pt100/1000)OPTISENS PH 8500 with coax cable (without internal Pt100/1000)

Coax shield (red) N (ref.)

Coax core (transparent) O (pH/ORP)

OPTISENS PH 8500 with SixPlug cable (with internal Pt100/1000)

OPTISENS PH 8500 with SixPlug cable (with internal Pt100/1000)OPTISENS PH 8500 with SixPlug cable (with internal Pt100/1000)

Inner coax shield (black) N (ref.)

Coax core (transparent) O (pH)

Sense (3-wire connection Pt100/Pt1000) U

Pt100 (white) P

Pt100 (green) X

Outer shield (green-yellow) S

Terminal block Pos.A/B

Terminal block Pos.A/BTerminal block Pos.A/B

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OPTISENS PH 8500

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.

INSTALLATION 3

3.5.2 Connecting the external temperature sensor

Connect an external Pt100 or Pt1000 sensor to terminal block Pos.A/B of the signal converter according to the following drawings:

Figure 3-5: Connection of an external Pt100/1000 temperature sensor to the signal converter

1 2-wire connection 2 3-wire connection

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3 INSTALLATION

3.5.3 Connecting the cable to the sensor

CAUTION!

Moisture inside the sensor connector must be avoided! Moisture will shortcut the mV signal between the electrodes and deliver erratic readings! If moisture has entered the connector dry it with air (e.g. hair blower).

Figure 3-6: Connecting the cable to the sensor

OPTISENS PH 8500

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 electrode 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 electrode

Before the electrode is installed, it has to be calibrated. Proceed as described on page 29. Then continue with the installation procedure.

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