wtw Turb 350 IR Operating instructions

Turb 350 IR

ba41114e02 04/2003

43

Operating manual

Portable Turbidimeter

44

Status at time of

going to press

The use of advanced technology and the high quality stan-

dard of our instruments are the result of a continuous devel-

opment. 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.

Copyright

Reproduction in whole - or even in part - is prohibited without

the express written permission of WTW GmbH & Co. KG,

Weilheim.

Printed in Germany.

List of contents

45

1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

1.1 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

1.2 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49

2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . .52

2.2 General safety instructions . . . . . . . . . . . . . . . .52

3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . 55

3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . .55

3.2 Initial commissioning . . . . . . . . . . . . . . . . . . . . .55

4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

4.1 Instructions for operating . . . . . . . . . . . . . . . . . .57

4.1.1 Marking and aligning cuvettes . . . . . . . .57

4.1.2 Venting the sample . . . . . . . . . . . . . . . . .59

4.2 Measuring turbidity . . . . . . . . . . . . . . . . . . . . . .60

4.3 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63

4.3.1 Basic information on calibration . . . . . . .63

4.3.2 Calibration procedures . . . . . . . . . . . . . .63

4.3.3 Preparing the calibration . . . . . . . . . . . .65

4.3.4 Four-point calibration . . . . . . . . . . . . . . .65

4.3.5 Partial calibration . . . . . . . . . . . . . . . . . .67

5 Maintenance, cleaning, disposal . . . . . . . . . . 71

5.1 Changing the batteries . . . . . . . . . . . . . . . . . . .71

5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73

5.2.1 Cleaning the measuring instrument . . . .73

5.2.2 Cleaning the cuvettes . . . . . . . . . . . . . . .73

5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74

6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . 75

7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . 77

8 Accessories, Options . . . . . . . . . . . . . . . . . . . 79

9 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

List of contents

46

Overview

47

1Overview

The Turb 350 IR enables rapid and reliable turbidity mea-

surements to be carried out on individual samples. This

complies with the measuring method used by ISO 7027 /

DIN EN 27027.

1

2

3

Cuvette

Alignment ring

Mark

4

5

Display

Keypad

TURB 350 IR

CAL

4283

NTU

1

2

3

4

5

Overview

48

1.1 Display

The LCD display has the following display elements:

1 Calibration symbol - instrument in the Calibration

mode

2 - Number of the selected calibration standard (when

the CAL display appears), or:

- Error number (flashes when the error symbol

appears)

3 Error symbol - flashes when an error occurs

4 Battery symbol - flashes if the battery needs to be

changed

5 Measuring unit NTU

6 Main line

...8

NTU

CAL ERR

13

2

4

123 4

5

6

Overview

49

1.2 Keypad

The Turb 350 IR has a keypad with the following 5 keys:

Key Function

Switch measuring instrument on/off

Increase a value;

Select settings

Start measurement

Reduce value;

Select settings

Call up Calibration mode

CAL

Overview

50

Safety

51

2 Safety

This operating manual contains basic instructions that you

must follow during the commissioning, operation and main-

tenance of the measuring instrument. Consequently, all re-

sponsible personnel must read this operating manual before

working with the measuring instrument.

The operating manual must always be available within the

vicinity of the measuring instrument.

Target group The measuring instrument was developed for measure-

ments on site and in the laboratory. We assume that, due to

their professional training and experience, operators are fa-

miliar with the safety measures that are necessary when

handling chemicals.

Symbols

used

Warning

indicates instructions that have to be followed to prevent

damage to your instrument.

Note

indicates notes that draw your attention to special features.

Note

indicates cross-references to other documents, e.g. Appli-

cation reports.

Safety

52

2.1 Authorized use

Authorized use consists exclusively of the turbidity mea-

surement of individual samples on site or in a laboratory en-

vironment.

The technical specifications given in the T

ECHNICAL DATA

chapter must be observed. Only the operation and running

of the measuring instrument according to the instructions

given in this operating manual is authorized. Any other use

is considered unauthorized.

2.2 General safety instructions

This instrument left the factory in a technically safe and se-

cure condition.

Function and

operating safety

The smooth functioning and operational safety of the mea-

suring instrument can only be guaranteed if the generally

applicable safety measures and the specific safety instruc-

tions that appear in this operating manual are followed dur-

ing operation.

The smooth functioning and operational safety of the mea-

suring instrument can only be guaranteed under the climatic

conditions specified in the chapter, T

ECHNICAL DATA.

If the instrument was transported from a cold environment to

a warm environment, the formation of condensate can im-

pair the functioning of the instrument. In this event, wait until

the temperature of the instrument reaches room tempera-

ture before putting the instrument back into operation.

Safety

53

Safe operation If safe operation is no longer possible, the instrument must

be taken out of service and secured against inadvertent op-

eration!

Safe operation is no longer possible if the measuring instru-

ment

l has been damaged in transport

l has been stored under adverse conditions for a lengthy

period of time

l is visibly damaged

l no longer operates as described in this manual.

If you are in any doubt, please contact the supplier of the in-

strument.

Obligations of the

operator

The purchaser of this measuring instrument must ensure

that the following laws and guidelines are observed when

using dangerous substances:

l EEC directives for protective labor legislation

l National protective labor legislation

l Safety regulations

l Safety datasheets of the chemical manufacturers.

Safety

54

Commissioning

55

3 Commissioning

3.1 Scope of delivery

l Turb 350 IR portable turbidity measuring instrument

l Operating manual

l 4 calibration standards (0.02 / 10.0 / 100 / 1000 NTU)

l Two empty cuvettes

l 4 alignment rings

l Cleaning cloths

l Carrying case with short operating manual

l 4 alkali-manganese batteries, type AAA/Micro

3.2 Initial commissioning

Inserting

the batteries

Insert the batteries that are included in the scope of delivery

into the instrument as follows:

1

2

3

4

Commissioning

56

The instrument is ready for operation.

Note

The measuring instrument was calibrated and tested by the

manufacturer before delivery. Consequently, you can begin

measuring immediately. However, we recommend perform-

ing a calibration again following the initial commissioning

(see section 4.3 C

ALIBRATION). Thus, you will quickly be-

come familiar with operating the measuring instrument and

the calibration procedure.

1 Place the instrument with the operating panel face

down on a soft surface.

2 Undo the two screws (1).

3 Open the lid of the battery compartment (2).

4 Insert the batteries (3). While doing so, check that the

poles are correct according to the diagram in the bat-

tery compartment.

5 Replace the lid of the battery compartment.

6 Attach the lid with the two screws. At the same time,

make sure that the sealing gasket around the battery

compartment (4) forms a tight seal with the lid.

Operation

57

4Operation

4.1 Instructions for operating

4.1.1 Marking and aligning cuvettes

Even completely clean quality cuvettes exhibit tiny direction-

al differences in their light transmittance. Therefore, each

cuvette should be marked - both the measuring cuvettes as

well as the cuvettes with the calibration standards (refer to

section 2130 of the "Standard Methods for the Examination

of Water and Wastewater", 19th edition). Consequently,

each cuvette can always be inserted in the correct position

and you can achieve precise and reproducible measuring

results.

Clean the cuvette The cuvette must be absolutely clean (see section

5.2.2 C

LEANING THE CUVETTES).

Marking a cuvette This is how to mark a cuvette (empty or full):

1 Switch on the turbidity measuring instrument by

pressing the

key. Let the turbidity measuring in-

strument warm up for at least 75 s.

2 The cuvette must be closed with the black light pro-

tection cap. Make sure that the outside of the cuvette

is clean, dry, and free of fingerprints.

3 Insert the cuvette in the cuvette shaft.

4 Slowly rotate the cuvette by one complete rotation

(by 360 °) in small steps and hold the

key de-

pressed while doing so. After each step, wait for a

moment until the display is stable. Watch the display

of the turbidimeter while you rotate the cuvette.

5 Turn the cuvette back to the position with the lowest

displayed value.

Operation

58

Note

Always use the cuvette and the light protection cap together;

only in this way is the cuvette marked.

Aligning a marked

cuvette

A marked cuvette is aligned as follows:

Aligning an

unmarked cuvette

An unmarked cuvette is aligned as follows:

6 With the cuvette in this position, place an alignment

ring on the cuvette so that the arrow on the alignment

ring points to the mark on the enclosure.

7 Leave the marker ring on the light protection cap of

the cuvette. This cuvette is now permanently marked.

1 Insert the cuvette in the cuvette shaft.

2 Align the marked cuvette so that the arrow on the

alignment ring points to the marking on the enclo-

sure.

1 Insert the cuvette in the cuvette shaft.

2 Slowly rotate the cuvette by one complete rotation

(by 360 °) in small steps and hold the

key de-

pressed while doing so. After each step, wait for a

moment until the display is stable. Watch the display

of the turbidimeter while you rotate the cuvette.

3 Turn the cuvette back to the position with the lowest

displayed value.

4 Leave go of the

key.

Operation

59

4.1.2 Venting the sample

Air bubbles in the sample affect the measuring result to a

massive extent because they have an extensive scattering

effect on the incident light. Larger air bubbles cause sudden

changes in the measured values whereas smaller air bub-

bles are recorded by the instrument as turbidity. Therefore,

avoid or remove air bubbles:

Avoiding or remov-

ing air bubbles

l During sampling, ensure all movement is kept to a mini-

mum

l If necessary, vent the sample (ultrasonic baths, heating or

adding a surface-active substance to reduce surface ten-

sion)

Operation

60

4.2 Measuring turbidity

Warning

Never pour liquid directly into the cuvette shaft. Always use

a cuvette for the measurement. The measuring instrument

only measures precisely when the cuvette is closed with the

black light protective cap (WTW cuvettes).

Note

The outside of the cuvette always has to be clean, dry, and

free of fingerprints. Clean the cuvette before starting to mea-

sure (see section 5.2.2 C

LEANING THE CUVETTES). Only hold

the cuvettes by the top or by the black light protection cap.

Measuring This is how to measure the turbidity of a sample using the

Turb 350 IR:

1 Switch on the turbidity measuring instrument by

pressing the

key. Let the turbidity measuring in-

strument warm up for at least 75 s. During this time,

continue with the steps 2 to 5.

2 Rinse out a clean cuvette with the sample to be mea-

sured:

Pour approximately 10 ml sample into the cuvette.

Close the cuvette and rotate it several times before

throwing the sample away.

3 Repeat the rinsing procedure twice more.

4 Fill the cuvette with the sample to be measured (ap-

prox. 15 ml). Close the cuvette with the black light

protection cap.

5 Make sure that the outside of the cuvette is clean,

dry, and free of fingerprints.

6 Insert the cuvette in the cuvette shaft so that it clicks

into place.

7 Align the cuvette (see section 4.1.1 MARKING AND ALI-

GNING CUVETTES).

Operation

61

Display when

measuring range is

exceeded

If the measured value lies outside the measuring range of

the Turb 350 IR, the display shows "

-Or-

-Or--Or-

-Or-

" (Overrange):

8 Press the

key. As long as the measured value

is being recorded, the display flashes.

9 Read off the measured value when the measurement

is complete and the display no longer flashes:

10 Repeat steps 2 to 9 for further samples.

CAL

ERR

13

2

4

4 2 8 3

NTU

CAL

ERR

13

2

4

- O r -

NTU

Operation

62

Display when mea-

suring range is

switched over or

due to air bubbles

The measuring instrument may briefly display "

----

--------

----

":

This can be caused by the following:

l The measuring instrument carries out an automatic

switchover of the measuring range. Wait until the instru-

ment has completed the automatic switchover of the mea-

suring range.

l There are air bubbles in the sample. Vent the sample if

necessary.

CAL

ERR

13

2

4

- - - -

NTU

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wtw Turb 350 IR Operating instructions

wtw Turb 350 IR Operating instructions

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