Wtw NitraLyt NOA User manual

ba75408e04 12/2005

NitraLyt®NOA

NitraLyt®NOA/AT

Operating Manual

NitraLyt®nitrate combination electrode

NitraLyt®NOA reference electrode

NitraLyt®NOA/AT exchange electrode

NitraLyt NOA/AT

NitraLyt NOA

NitraLyt®NOA; NitraLyt®NOA/AT

12 ba75408e04 12/2005

Accuracy when going to

press

The use of advanced technology and the high quality standard of our

products are the result of continuous development. This may result in

differences between this operating manual and your electrode. 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.

Note

The latest version of the present operating manual can be found on the

Internet under www.WTW.com.

Reprinting - even as excerpts - is only allowed with the explicit written

authorization of WTW GmbH, Weilheim.

Printed in Germany.

NitraLyt®NOA; NitraLyt®NOA/AT Contents

ba75408e04 12/2005

Contents

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Response times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Aging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Factors affecting the measured values . . . . . . . . . . . . . . . 16

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Overview NitraLyt®NOA; NitraLyt®NOA/AT

14 ba75408e04 12/2005

Overview

The NitraLyt®combination electrode forms a measuring system for the

online determination of nitrate ions. It supplements the oxygen and

ammonium measurement in the aeration tank and enables an efficient

aeration control.

The NitraLyt®combination electrode is used in the NitraLyt®700 IQ

sensor.

Structure of the

NitraLyt®combination

electrode

Caution

The membrane and junction of the electrode must never

!dry up (observe notes on storage)

!be damaged

!be brought into contact with grease.

1Membrane

2Junction

3Sealing rings for installation in NitraLyt®700 IQ

4Plug head connector

NitraLyt NOA/AT (exchange electrode)

NitraLyt NOA (reference electrode)

NitraLyt®NOA; NitraLyt®NOA/AT Assembly

ba75408e04 12/2005

Assembly

Installing the

NitraLyt®NOA/AT

in the NitraLyt®NOA

reference electrode

1Remove the wet cap (5) and blind plug (6) from the reference

electrode. Store both accessories. You need them if you want

to store the reference electrode.

2Remove the watering cap (7) and nut (8) from the exchange

electrode.

Store both accessories. You need them if you want to store the

reference electrode.

3 Screw the NitraLyt®NOA/AT exchange electrode into the

NitraLyt®NOA reference electrode without leaving any gap.

A flat wrench (wrench size 13 mm) or the protective hood of the

sensor is suitable as a wrench (see following figure).

Protection hood

Assembly NitraLyt®NOA; NitraLyt®NOA/AT

16 ba75408e04 12/2005

Note

After installing the electrode tap your finger against the combination

electrode to remove any air bubbles from the back of the membrane.

When doing so hold the electrode in an upright position (membrane

downward).

Installing the

combination electrode

in the NitraLyt®700 IQ

sensor

Instructions on how to install the combination electrode in the sensor

are given in the operating manual of the sensor.

Response times

The response time depends on the concentration range. It is

!several seconds at high concentrations,

!several minutes near the detection limit.

Aging

Every electrode undergoes a natural aging process. The response time

increases and the slope decreases with the age of the electrode. The

following factors shorten the lifetime considerably:

!Incorrect storage

!Special measuring conditions (e.g. organic solutions, frequent

measurement with high concentrations of interfering ions)

!High temperatures and high temperature changes

Caution

Greases, oils, certain tensides and similar substances can

shorten the operational lifetime of the electrodes. Therefore, they

should not be present in the test sample.

The warranty does not cover damage caused by measuring conditions

and mechanical damage.

Factors affecting the measured values

Interferences !Chloride ions

Note

The effect of chloride ions on measurement and compensating actions

are described in detail in the WTW primer ION SELECTIVE MEASUREMENT

IN ONLINE ANALYSIS.

NitraLyt®NOA; NitraLyt®NOA/AT Maintenance

ba75408e04 12/2005

Maintenance

In the case of increased response times or drifting measured values,

store the electrode in the standard solution ES/NO3_ISA-50 (ordering

information, see section ACCESSORIES) for several hours.

Subsequently, recalibrate.

Cleaning

Storage

1 to 2 days Attach the wet cap to the combined electrode with the exchange

electrode screwed in. Before doing so, wet the foam padding in the wet

cap with ES/NO3_ISA-50 standard solution (ordering information, see

section ACCESSORIES).

More than two days Uninstall the exchange electrode and store the components as follows.

Reference electrode:

Screw in the blind plug, wet the foam padding in the wet cap with

deionized water and plug on the wet cap.

Exchange electrode:

Screw the exchange electrode into the nut up to the stop. Before doing

so, wet the foam padding in the watering cap with ES/NO3_ISA-50

standard solution (ordering information, see section ACCESSORIES).

Subsequently, plug the exchange electrode into the wet watering cap.

Contamination Cleaning

Coarse contamination on the

junction of the NitraLyt®NOA

reference electrode

Carefully brush off contamination

under running water using a soft

toothbrush.

Contamination on the

membrane of the

NitraLyt®NOA/AT exchange

electrode

Splash the electrode with water.

Remove coarse contamination using

a soft toothbrush under running

water.

Accessories NitraLyt®NOA; NitraLyt®NOA/AT

18 ba75408e04 12/2005

Accessories

Nitrate electrodes

Protective hood

Standard solutions for

nitrate calibration

Note

Further information can also be found in the operating manual of the

sensor NitraLyt®700 IQ.

Note

Information on other IQ SENSOR NET accessories is given in the WTW

catalog and on the Internet.

Note

Information on the fundamentals of measuring with ion sensitive

electrodes are given in the WTW primer, ION SELECTIVE MEASUREMENT

IN ONLINE ANALYSIS.

Designation Order no.

NitraLyt®NOA 107024

NitraLyt®NOA/AT 107026

Designation Order no.

NitraLyt®IQ-SK 107016

Designation Order no.

ES/NO3_ISA-5 5 mg/l NO3-N; 1000 ml 107030

ES/NO3_ISA-50 50 mg/l NO3-N; 1000 ml 107032

ES/NO3_ISA-500 500 mg/l NO3-N; 1000 ml 107034

SL NO3 19811 1000 mg/l NO3; 500 ml 250476

ES/NO3 10 g/L NO3; 1000 ml 120220

NitraLyt®NOA; NitraLyt®NOA/AT Technical data

ba75408e04 12/2005

Technical data

Nitrate range mg/l NO3-N 0.1 ... 1000 mg/l

mg/l NO3-0.5 ... 4500 mg/l

Temperature range Operation 0°C ... 40 °C (32 ... 104 °F)

Storage/transport 0°C ... 40 °C (32 ... 104 °F)

Response time at 20 °C < 3 min

(when concentration changes from 5 mg/l to 50 mg/l NO3-N)

Type of protection IP 68; 0.2 bar

(complete combination electrode, mounted in the NitraLyt®700 IQ

sensor)

Connection technique Connection via S7 plug head connector

Material Enclosure:

NitraLyt®NOA

NitraLyt®NOA/AT

PVC

POM

Junction (NitraLyt®NOA) Polyethylene

Membrane (NitraLyt®NOA/AT) PVC, soft

Blind plug PVC

Wet cap PVC

Watering cap Silicone

Wissenschaftlich-Technische Werkstätten GmbH

Dr.-Karl-Slevogt-Straße 1

D-82362 Weilheim

Germany

Tel: +49 (0) 881 183-0

+49 (0) 881 183-100

Fax: +49 (0) 881 183-420

E-Mail: Info@WTW.com

Internet: http://www.WTW.com

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