TESTO 205 Bedienungsanleitung

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testo 205

pH / Temperature Measuring Instrument

Bedienungsanleitung de

Instruction Manual en

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General Information16

General Information

Please read this document through carefully and familiarise your-

self with the operation of the product before putting it to use.

Keep this documentation to hand so that you can refer to it when

necessary.

Symbols and what they mean

Symbol Meaning Remarks

Warning text: Warning! Please read warning

Serious physical injuries could occur carefully and take the

if the precautionary measures precautionary measures

specified are not taken. specified.

Warning text: Caution! Please read warning

Light physical injuries could occur carefully and take the

if the precautionary measures precautionary measures

specified are not taken. specified.

Note Pay particular attention

to Notes.

Taste Button name Press button.

Text, Display content Text or symbol is shown

on the display.

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Contents

1. Safety Information ................................................................18

2. Intended Purpose ................................................................19

3. Product Description .............................................................20

3.1 Display and control elements .............................................................20

3.2 Power ................................................................................................20

3.3 Storage cap ......................................................................................21

3.4 Wall/Transport bracket ......................................................................21

4. Initial Operation ....................................................................21

5. Operation ............................................................................22

5.1 Switching on/off ................................................................................22

5.2 Setting instrument .............................................................................22

5.3 Measuring .........................................................................................23

5.4 Calibrating instrument ........................................................................24

6. Service and Maintenance ....................................................26

6.1 Checking electrolyte gel .....................................................................26

6.2 Cleaning housing ...............................................................................26

6.3 Cleaning probe ..................................................................................26

6.4 Changing the probe ...........................................................................27

6.5 Changing battery ...............................................................................27

7. Questions and Answers .......................................................28

8. Technical data .....................................................................29

9. Accessories and Spare Parts ...............................................30

Contents 17

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1. Safety Information18

1. Safety Information

Avoid electrical hazards:

Do not measure on or near live parts!

Preserving product safety / warranty claims:

Operate the instrument properly and according to its intended

purpose and within the parameters specified. Do not use

force.

Do not store together with solvents (e.g. acetone).

Temperature data on probes / sensors refer only to the meas-

urement area of the sensors. Do not expose handles and

cables to temperatures greater than 70°C if they are not spe-

cifically designed for higher temperatures.

Open the instrument only when this is expressly described in

the documentation for maintenance purposes.

Only the maintenance and service work described in the docu-

mentation should be carried out. Please adhere to the steps

specified. For safety reasons, only original spare parts from

Testo should be used.

Ensure correct disposal:

Disposal of defective rechargeable batteries and spent batter-

ies at the collection points provided.

Send the instrument directly to us at the end of its life cycle.

We will ensure that it is disposed of in an environmentally

friendly manner.

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2. Intended Purpose

testo 205 is a practical instrument for measuring pH value and

temperature.

Its appliclation areas include the measurement of semi-solid sub-

stances in the food production and processing sector:

abattoirs, cutting plants, Incoming goods checks during trans-

port, cheese production and in bakeries.

testo 205 is not suitable for diagnostic measurements in the

medical sector.

The following components of the product are designed for continuous

contact with foodstuffs in accordance with the regulation

(EC) 1935/2004:

The measurement probe up to 1 cm before the probe handle or the

plastic housing. If provided, the information about penetration depths

in the instruction manual or the mark(s) on the measurement probes

should be noted.

2. Intended Purpose 19

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3. Product Description

3.1 Display and control elements

3.2 Power

Power is via four button cells (Type LR44, included with delivery).

MODE:

change function

ON/HOLD:

On/Off switch,

holds readings

Battery com-

parment

CAL: Calls up “calibration”

mode

Display

3. Product Description20

Probe socket with

screw ring

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3.3 Storage cap

The storage cap filled with electrolyte gel is

used to store the probe between measure-

ments.

The probe is only immediately ready to

operate if stored in electrolyte gel.

If the probe has been out of the electrolyte gel for a longer per-

iod of time, it must be stored in the electrolyte gel for approx. 12

hours to regenerate.

The storage cap can also be attached to the wall/transport brack-

et.

3.4 Wall/Transport bracket

The wall/transport bracket with belt holder

and attachment unit for the storage cap is

used for the safe storage of the measure-

ment instrument at a fixed point or during

transport.

4. Initial Operation

Insert battery

1 Remove battery compartment.

2 Insert batteries (4 x Type LR44). Watch

out for +/-!

3 Push battery compartment back in.

4 Remove protection strip on the storage

cap.

3. Product Description 21

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5. Operation22

5. Operation

5.1 Switching on/off

Switch on instrument: ON/HOLD .

- All segments light up briefly and the instrument changes to the

measurement mode.

Switch off instrument: Keep ON/HOLD pressed.

5.2 Setting instrument

The following functions can be set:

Function Description Setting options

Temperature unit Sets unit °C or °F

Auto Hold (AUTO HOLD) Automatically holds reading, On (switched on) or

as soon as it is stable* OFF (switched off)

Gradient / Offset Displays gradient and offset None

values stored in the instrument (Information only)

Calibration method (CAL) Sets 1, 2 or 3 point 1P, 2P or 3P

calibration

Calibration points (CAL pH) Sets calibration points 1P: 4, 7or 10

2P: 47or 7 10

Auto Off (AUTO OFF) Instrument switches off On (switched on) or

automatically after 10 minutes OFF (switched off)

if no button has been pressed

Display light (bl) Display light goes on for On (switched on) or

approx. 3 s whenever a OFF (switched off)

button is activated

Beeper (bP) Warning sound (button pressed, On (switched on) or

stable reading reached with OFF (switched off)

Auto Hold function switched on)

* Modification less than 0.02pH in 20s

The setting procedure can be interrupted by switching off the

instrument. The modifications are then not saved.

The instrument is switched off.

1 Opening the setting mode: MODE is kept pressed + ON/HOLD

.

2 Select temperature unit (°C or °F): CAL .

Confirm selection: MODE .

3 Switch Hold on (On) or off (OFF): CAL .

Confirm selection: MODE .

- The gradient and offset values stored in the instrument are dis-

played as information.

4 Change view: MODE .

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5 Select calibration method (1P, 2P or 3P): CAL .

Confirm selection: MODE .

If 1 or 2 point calibration has been set:

Select calibration points (4, 7 or 10, and 4 7 or 7 10): CAL .

Confirm selection: MODE .

6 Switch Auto Off on (On) or off (OFF): CAL .

Confirm selection: MODE .

7 Display light on (On) or off (OFF): CAL .

Confirm selection: MODE .

8 Switch beeper on (On) or off (OFF): CAL .

Confirm selection and save set-

tings: MODE .

- All of the segments light up briefly and the instrument changes

to the measurement mode.

5.3 Measuring

Setting up the instrument

If large quantities of the electrolyte gel are stuck to the probe

when removed from the storage cap, it is a sign that the gel is

spent.

A new storage cap is needed.

Clean off the pH probe before and after each measurement

with low concentration soap water followed by tap water

(water temperature should be below 40 °C). Dab dry with a

paper towel. Do not rub.

After horizontal storage:

Briefly shake the probe in order to release any gas bubbles

which may have formed in the probe tip.

1 Carefully remove storage cap.

2 Switch on instrument: ON/HOLD .

Carry out measurement

Measurement tip made of glass, risk of breakage!

Risk of injury on account of glass parts which remain in the

measurement medium.

Check measurement tip of pH probe after each measurement

for damage.

5. Operation 23

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5. Operation24

Immerse/penetrate probe in the medium to be measured.

- The measured pH and temperature values are displayed. The

readings are updated twice a second.

Hold readings manually: ON/HOLD .

Restart measurement: ON/HOLD .

- If Auto-Hold is switched on, AUTO HOLD flashes until the

instrument has found a stable pH reading. The readings are

then frozen (AUTO HOLD lights up). If no stable pH readings

have been found within 300s, the measurement is stopped (

and AUTO HOLD light up).

Restart measurement:

ON/HOLD .

Finish measurement

1 Switch off instrument: Keep ON/HOLD pressed.

2 Clean off the pH probe with low concentration soap water

followed by tap water (water temperature should be below

40 °C). Dab dry with a paper towel. Do not rub.

3 Insert probe in the storage cap filled with electrolyte gel.

The probe tip must be immersed in the electrolyte gel. Keep

electrolyte gel clean.

5.4 Calibrating instrument

Please also adhere to the instructions supplied with the buffer

solution (Testo buffer: see label).

During calibration it is important, that the glass probe does not

touch the synthetic material of the bottle. Preferably do not

leave the instrument in the bottle, as variations in calibrations of

up to ± 0.4 pH can arise.

The instrument is switched on and is in the measurement mode.

1 Open calibration mode: CAL .

- Calibration point (4, 7 or 10) is shown and CAL flashes.

2 Skip calibration point: MODE .

-or-

Immerse probe in the buffer solution and start calibration:

CAL .

- The instrument waites for a stable reading: AUTO flashes.

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