Xylem MPP 350 User Manual

MPP 350

Operating manual

Multi parameter probe for pH, dissolved oxygen, conductivity and temperature

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MPP 350

Accuracy when

going to press

The use of advanced technology and the high quality standard of our instruments are the result of continuous development. This may result in differences between this operating manual and your instrument. Also, we cannot guarantee that there are absolutely no errors in this manual. Therefore, we are sure you will understand that we cannot accept any legal claims resulting from the data, figures or descriptions.

Reprinting - even as excerpts - is only allowed with the explicit written authorization of WTW GmbH, Weilheim. Printed in Germany.

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MPP 350 Contents

1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.1 Structure and function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.2 Instrument identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.1 Scopes of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.2 Getting the sensor ready for measuring . . . . . . . . . . . . . . . . . . 9

4 Measuring / Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.1 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.2 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.3 Storing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5 Maintenance, cleaning, replacement . . . . . . . . . . . . . . . . . . 14

5.1 General maintenance instructions . . . . . . . . . . . . . . . . . . . . . . 14

5.2 Outside cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.3 D.O. module: Changing the electrolyte solution and membrane

cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.4 D.O. module: Cleaning the electrodes . . . . . . . . . . . . . . . . . . 18

5.5 Checking the D.O. module for freedom from zero-current . . . 20

5.6 Aging of the probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5.7 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

6.1 Error symptoms of D.O. measurement . . . . . . . . . . . . . . . . . . 22

6.2 Error symptoms of conductivity measurement . . . . . . . . . . . . 23

6.3 Error symptoms of pH measurement . . . . . . . . . . . . . . . . . . . 23

7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

7.1 Basic module with conductivity measuring cell . . . . . . . . . . . . 24

7.2 Dissolved oxygen (D.O.) module . . . . . . . . . . . . . . . . . . . . . . . 26

8 Wear parts and accessories . . . . . . . . . . . . . . . . . . . . . . . . . 29

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Overview MPP 350

1 Overview

1.1 Structure and function

The MPP 350 multi parameter probe is a modularly constructed sensor for pH, dissolved oxygen, conductivity and temperature. Its maximum configuration comprises the following basic components:

! Basic module with permanently built-in conductivity measuring cell ac-

cording to the quadripole measuring principle, with integrated temperature sensor

! Removable dissolved oxygen module, according to the galvanic measur-

ing principle

! Removable, armored pH electrode with S7 plug-in connector

Detailed structure

(see figure on the

right page)

1 Closing head

2 Protective hood

3 Sinker

Conductivity measuring cell:

4 Temperature sensor in graphite enclosure

5 Voltage electrode (inside, 2x)

6 Current electrode (ring, 2x)

7 Plug connection for D.O. module

D.O. module:

8 Cap nut

9 Screw thread base with ventilation area

10 Lead counter electrode (anode)

11 Insulator

12 Gold working electrode (cathode)

13 Membrane cap (filled with electrolyte solution)

pH electrode:

14 S7 plug-in connector

15 Armoring

16 Sealing ring

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MPP 350 Overview

Basic module

Conductivity measuring cell

5, 6

D. O. module

pH electrode

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Overview MPP 350

The basic module is the basic component of the operable sensor. It can be used as a stand-alone conductivity measuring cell with temperature sensor. By mounting the D. O. module and/or pH electrode the basic module can be extended to form a multi parameter probe for pH, dissolved oxygen, conductivity and temperature.

The D.O. module is connected to the basic module via a watertight, threepole plug connection. The conductivity measuring cell measures the temperature, which is required for the determination of the D.O. content. For this reason the D.O. module only works in conjunction with the basic module.

The pH electrode is electrically connected to the basic module via an S7 plugin connection. It is mechanically fixed with the aid of the protective hood.

Recommended

fields of

application

! On site measurements in rivers, lakes, sea water and brackish water as

well as waste water

! Measurements in boreholes (up to a diameter of two inches) up to 100 m

depth

! Fishfarming

! Measurements in ground water and spring water

! Applications in water laboratories

1.2 Instrument identification

A series number is printed on every module. Keep these numbers ready if you have questions to ask the WTW service department. The series numbers contain the following information:

Basic module The number is imprinted on the shaft of the conductivity measuring cell.

12 3

04360013

1 Manufacturing year 20... (example: 2004)

2 Calendar week of manufacturing (CW 36)

3 Sequential batch number (0013)

Dissolved oxygen

(D.O.) module

pH electrode For notes concerning the series number of the electrode refer to the electrode

The number is imprinted on the cap nut.

1234

0442A007

operating manual.

1 Manufacturing year 20... (example: 2004)

2 Calendar week of manufacturing (CW 42)

3 Sensor type (type A)

4 Sequential batch number (007)

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MPP 350 Safety

2Safety

This operating manual contains special instructions that must be followed during the operation of the sensor. Always keep this operating manual in the vicinity of the sensor.

Special user

qualifications

General safety

instructions

The membrane cap of the D. O. module is filled with a small amount of an alkaline electrolyte solution. All maintenance work that requires dealing with the electrolyte solution must only be carried out by persons who know how to deal with chemicals safely.

The individual chapters of this operating manual use safety labels like the one below to indicate danger:

Caution

indicates instructions that must be followed precisely in order to avoid slight injuries or damage to the instrument or the environment.

3 Commissioning

3.1 Scopes of delivery

3.1.1 Scope of delivery, MPP 350-x

! Basic module, with mounted D. O. module in the OxiCal

tion and storing vessel. The D.O. module is filled with electrolyte solution and operable. The receptacle for the pH electrode is closed with a plug.

-MPP air calibra-

! MPP-Prot protective hood, mounted, with MPP-S sinker

! BR MPP 350 battery-powered stirrer (with cable lengths from 10 m only)

! Cable drum (with cable lengths from 40 m only)

! MPP-Cal calibration vessel for pH and conductivity

! ZBK 325 accessory set for D. O. module, comprising:

– 3 exchange membrane caps, WP 90

– Electrolyte solution, ELY/G

– Cleaning solution, RL/G

– Polishing strip, SF 300

! 1 closing cap for conductivity measuring cell

! 1 closing cap for D.O. module

! 1 plug for electrode receptacle

! Operating manual for MPP 350

! CD-ROM Update Multi 350i

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Commissioning MPP 350

Note

The membrane cap that is mounted on the D.O. sensor for delivery serves mainly as a transport protection. Depending on the duration of the transport and storage period, it may have a shortened operational lifetime. If the measuring system cannot be calibrated (error message on the instrument), please proceed according to section 5.3 D.O.

TROLYTE SOLUTION AND MEMBRANE CAP.

MODULE: CHANGING THE ELEC-

3.1.2 Set equipment

The MPP 350 is also available as a set in the MPP-FC field case. You can also buy the carrying case as an accessory and fit it with components yourself. Electrodes with a cable length of up to 25 m fit in the carrying case. Ordering information, see chapter 8 W

EAR PARTS AND ACCESSORIES.

Equipment of the

field case

MPP-FC

(example)

1 Electrode or battery-powered

8 Reagents (buffers etc...)

stirrer

2 Manual, CD-ROM 9 Plug

8 10

11, 12

13 8

3 Meter 10 Protective hood with sinker

4 Plug-in power supply unit 11 Exchange membrane caps

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MPP 350 Commissioning

5 Small parts (adapters etc...) 12 Polishing film

6 MPP 350 with OxiCal

-MPP 13 pH/cond calibration vessel

7 Connection cable

3.2 Getting the sensor ready for measuring

3.2.1 Measurements without D. O. module

Make sure that the plug connector of the conductivity measuring cell is tightly closed with the suitable closing cap. When mounted, the closing cap (1) must be screwed on up to the stop.

Before screwing on the closing cap, check the following points:

! The sealing (2) must be clean and evenly positioned in the groove.

! The plug connection and the inside of the closing cap must be clean and

dry.

3.2.2 Measurements without pH electrode

Make sure the electrode receptacle on the basic module (1) is tightly closed with the plug (2) and the protective hood (4) is screwed on up to the stop. Be-

fore plugging in, check whether the sealing (3) of the plug is clean and correctly positioned. The sealing should always be slightly greased (with the O ring grease of the pH electrode).

Caution

Never operate the MPP 350 without the protective hood. The protective hood fixes the pH electrode or plug in the electrode receptacle and guarantees a pressure-resistant sealing. It especially protects the pH electrode from mechanical damage.

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