Xylem LFOx1400, LFOx1400-ID User Manual

Operating manual

LFOx1400

LFOx1400-ID

Combined Conductivity and Dissolved Oxygen Sensor

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LFOx1400

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

LFOx1400(-ID) Contents

LFOx1400(-ID) - Contents

1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

1.1 Structure and function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

1.2 Instrument identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

3.1 Scopes of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

3.2 Getting the sensor ready for measuring . . . . . . . . . . . . . . . . . 32

4 Measuring / Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

4.1 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

4.2 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

4.3 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

5 Maintenance, cleaning, replacement . . . . . . . . . . . . . . . . . . 34

5.1 General maintenance instructions . . . . . . . . . . . . . . . . . . . . . . 34

5.2 Outside cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

5.3 DO module: Changing the electrolyte solution and

membrane cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

5.4 DO module: Cleaning the electrodes . . . . . . . . . . . . . . . . . . . 39

5.5 Checking the DO module for freedom from zero-current . . . . 41

5.6 Aging of the conductivity measuring cell . . . . . . . . . . . . . . . . . 41

5.7 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

6.1 Error symptoms of DO measurement . . . . . . . . . . . . . . . . . . . 43

6.2 Error symptoms of conductivity measurement . . . . . . . . . . . . 43

7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

7.1 Conductivity basic module . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

7.2 Dissolved oxygen (DO) module . . . . . . . . . . . . . . . . . . . . . . . . 45

8 Wear parts and accessories . . . . . . . . . . . . . . . . . . . . . . . . . 48

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Overview LFOx1400(-ID)

41, 2 3 5

78961110 12

Conductivity basic module

Dissolved oxygen (DO) module

1Overview

1.1 Structure and function

The LFOx1400(-ID) is a modular sensor for conductivity, dissolved oxygen (DO) and temperature. It consists of two basic components:

 Conductivity basic module, according to the quadripole measuring princi-

ple, with integrated temperature sensor

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

ing principle

Structure of the

LFOx1400(-ID)

1 Voltage electrode (inside, 2x)

2 Current electrode (ring, 2x)

3 Temperature sensor in a graphite enclosure

4 Shaft

5 Connection head

6 Membrane cap (filled with electrolyte solution)

7 Gold working electrode (cathode)

8 Insulator

9 Lead counter electrode (anode)

10 Screw thread base with ventilation area

11 Cap nut

12 Plug connection

13 Closing cap for conductivity basic module

14 Closing cap for DO module

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LFOx1400(-ID) Overview

03360013

12 3

0342A007

1234

The conductivity basic module can be used as an independent conductivity measuring cell. For this purpose, unscrew the DO module and close the open plug connection with a closing cap.

The DO module is connected to the conductivity basic module via a watertight, three-pole plug connection. The conductivity basic module measures the temperature, which is required for the determination of the DO content. For this reason the DO module only works in conjunction with the conductivity basic module.

Automatic sensor

recognition

Recommended

fields of

application

In the plug connector of the LFOx1400-ID sensor, data is stored for the automatic sensor recognition function. Among other, this data includes the sensor type and series number. Besides, the calibration data is written in the sensor with every calibration procedure. When the sensor is connected, the data is called up by the meter and used for measurement and measured value documentation. The correct data is always used automatically if the sensor is operated with several meters because the data is stored in the sensor.

To be able to use the automatic sensor recognition function, a meter is required that supports the function. More information on the automatic sensor recognition function is given in the operating manual of the meter.

 On site measurements in rivers, lakes and wastewater

 Ground water measurements

 Applications in water laboratories

1.2 Instrument identification

A series number is printed on both LFOx1400(-ID) modules. Keep these numbers ready if you have questions to ask the SI Analytics service department. The series numbers contain the following information:

Conductivity basic

Dissolved oxygen

(DO) module

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The number is printed on the shaft.

module

1 Manufacturing year 20... (example: 2003)

2 Calendar week of manufacturing (CW 36)

3 Sequential batch number (0013)

The number is printed on the cap nut.

1 Manufacturing year 20... (example: 2003)

2 Calendar week of manufacturing (CW 42)

3 Sensor type (type A)

4 Sequential batch number (007)

Safety LFOx1400(-ID)

2 Safety

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 DO 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 of the LFOx1400(-ID)

 LFOx1400(-ID) combination conductivity and DO sensor,

DO module filled with electrolyte solution and ready to use

 1 closing cap for conductivity basic module

 1 closing cap for DO module

 3 exchange membrane caps, Ox923

 Calibration and storage vessel, OxiCal

 Polishing strip, SF300

 Electrolyte solution, Ox920

 Cleaning solution, Ox921

 Operating manual for LFOx1400(-ID)

Note

The membrane cap that is mounted on the DO 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 section 5.3 DO

ELECTROLYTE SOLUTION AND MEMBRANE CAP.

-CX

MODULE: CHANGING THE

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LFOx1400(-ID) Commissioning

3.1.2 Scope of delivery of the conductivity basic module

 Conductivity basic module

 1 closing cap, mounted on the conductivity basic module

 Operating manual for LFOx1400(-ID)

3.1.3 Scope of delivery of the DO module

 DO module, filled with electrolyte solution and operable

 1 closing cap, mounted on the DO module

 1 exchange membrane cap, Ox923

 Polishing strip, SF300

 Electrolyte solution, Ox920

 Cleaning solution, Ox921

 Operating manual for LFOx1400(-ID)

Note

ELECTROLYTE SOLUTION AND MEMBRANE CAP.

MODULE: CHANGING THE

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Commissioning LFOx1400(-ID)

21 3

3.2 Getting the sensor ready for measuring

3.2.1 Measurements with the conductivity basic module

Make sure that the plug connection is tightly closed by the 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.

Screwing on the

DO module

3.2.2 Measurements with the combination sensor

Make sure that the DO module and conductivity basic module are screwed together tightly. When mounted, the cap nut of the DO module has to be screwed on up to the stop.

Before screwing on the DO module, check the following points:

 The sealing (3) must be clean and evenly positioned in the groove.

 The plug connection must be dry on both sides.

Position the DO module (1) on the conductivity basic module and carefully and with slight pressure turn it until the guiding nib on the DO module locks in place in the corresponding groove on the conductivity basic module. Subsequently tighten the cap nut (2) up to the stop. The thread only snatches if the DO module was correctly positioned.

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