testo 206 Instruction Manual

pH / Temperature Measuring Instrument

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Instruction Manual en

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testo 206

General Information

18

General Information

Please read this document through carefully and familiarise your­self 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

Button

Text, Display content Text or symbol is shown

to Notes.

Button name Press button.

on the display.

Contents

Contents

Contents .................................................................................19

1. Safety Information ................................................................20

2. Intended Purpose ................................................................21

3. Product Description ............................................................. 22

3.1 Display and control elements .............................................................22

3.2 Probe/BNC modules .........................................................................22

3.3 Power ................................................................................................23

3.4 TopSafe ............................................................................................23

3.5 Storage cap ......................................................................................23

3.5 Wall/Transport bracket ......................................................................23

4. Initial Operation ....................................................................24

4.1 Insert battery .....................................................................................24

4.2 Connect external probe (BNC module pH3 only) ................................24

5. Operation ............................................................................25

5.1 Switching on/off ................................................................................25

5.2 Setting instrument .............................................................................25

5.3 Measuring .........................................................................................26

5.4 Calibrating instrument ........................................................................28

6. Service and Maintenance ....................................................29

6.1 Checking electrolyte gel ..................................................................... 29

6.2 Cleaning housing ...............................................................................29

6.3 Cleaning probe ..................................................................................29

6.4 Changing the module ........................................................................30

6.5 Changing battery ...............................................................................30

7. Questions and Answers ....................................................... 31

8. Technical data .....................................................................32

9. Accessories and Spare Parts ............................................... 33

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1. Safety Information

20

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.

2. Intended Purpose

2. Intended Purpose

testo 206 is a practical instrument for spot check measurements
of pH value and temperature.

It has different applications depending on the probe/BNC module
used.

testo 206 with pH1 immersion probe

Measurement of liquid substances in the following sectors:

· Food companies (e.g. fruit juices)

· Industry (e.g. refrigerant, electroplating, chip production, paints
and varnish, print products)

· Chemistry (e.g. cleaning agents)

· Environmental protection (e.g. drinking water/waste water)

· Swimming pools, aquaria

· Agriculture

· Fish farming

· Pharmaceuticals and biotechnology

testo 206 with pH2 penetration probe

Measurement of semi-solid substances in food production and
processing: e.g. marmelades, marzipan, pastes, ready-to-serve
salad, gelling agents, fruit, milk products, bakery and confection­ery products. Laboratory measurements in companies involved in
the processing of food.

testo 206 with pH3 BNC module

The BNC socket is used to connect external pH probes. Ranges
of application depend on the probe attached.

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testo 206 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.

3. Product Description

22

3. Product Description

3.1 Display and control elements

Display

ON/HOLD:

On/Off switch,

holds readings

Battery com-

partment

(rear side)

MODE:
Changes function,
calls up “manual temper­ature compensa tion” (pH3
BNC-module only with
non-temperature compen­sated probe)

CAL: Calls up “calibration”
mode

3.2 Probe/BNC modules

Immersion probe (pH1)

Penetration probe (pH2)

BNC module (pH3)

3. Product Description

3.3 Power

Power is via a button cell (Typ CR2032, 3V; included with
delivery).

3.4 TopSafe

TopSafe protects the instrument from
moisture and mechanical strain (impact).
We recommend you always use TopSafe.

The IP68 protection class is achieved if
the instrument is placed inside the Top­Safe and is closed.

3.5 Storage cap

The storage cap filled with electrolyte gel is
used to store the probe between measure­ments.

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 per­iod 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 brack­et.

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3.6 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

24

4. Initial Operation

4.1 Insert battery

1 Open the TopSafe sealing cap and remove instrument.
2 Open battery compartment on rear of instrument.
3 Insert button cell (Type CR2032, 3V). The (+) sign must be vis-

ible.
4 Close battery compartment.
5 Remove protection strip on the storage cap.

4.2 Connect external probe (BNC module pH3 only)

Attach BNC plug from the external probe to the BNC socket

and seal with the aid of a bayonet coupling.

5. Operation

5. Operation

25

5.1 Switching on/off

Switch on instrument:

- All segments light up briefly and the instrument changes to the
measurement mode.

Switch off instrument: Keep

ON/HOLD

.

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)
(amount)

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

Calibration points (CAL pH) Sets calibration points 1P: 4, 7 or 10
2P: 4 7 or 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

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 +

.

CAL

CAL

.

.

2 Select temperature unit (°C or °F):

Confirm selection:

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

Confirm selection:

MODE

MODE

.

.

- The gradient and offset values stored in the instrument are dis­played as information.

4 Change view:

MODE

.

ON/HOLD

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5. Operation

26

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

Confirm selection:

MODE

.

CAL

.

If 1 or 2 point calibration has been set:

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

Confirm selection:

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

Confirm selection:

7 Switch beeper on (On) or off (OFF):

MODE

MODE

.

CAL

.

.

CAL

.

CAL

Confirm selection and save set-

MODE

tings:

.

- 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.

When using the BNC module, please note the application

information included with the external probe.

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:

Carry out measurement

ON/HOLD

.

.

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

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:
Restart measurement:

ON/HOLD

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

.

Manual temperature compensation

This function is only available with a connected BNC module
(pH3) if a pH probe without temperature sensor is connected.
The temperature can then be adapted to the temperature of
the medium being measured.

1 Open manual temperature compensation mode:

Increase value:

CAL

. Keep button pressed to get through

MODE

.

values quickly.

2 Change setting direction:

Lower value:

CAL

MODE

.

. Keep button pressed to get through

values quickly.

3 Finish setting:

MODE

.

- All segments light up briefly and the instrument will change to
the measurement mode.

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.

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

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5. Operation

28

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:

- testo 206-pH3 with pH probe without temperature sensor: The
set temperature value for manual temperature compensation
is displayed for 2s. The value must correspond to the temper­ature of the buffer solution.

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

2 Skip calibration point:

-or­Immerse probe in the buffer solution and start calibration:

CAL

.

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

- If a stable reading is available (change less than 0.02pH in

20s), the calibration point calibrates and the instrument
changes to the next calibration point (if available) or to the
gradient and offset value display.

Carry out calibration manually:

3 Repeat Step 2 for additional calibration points.

- Once calibration is complete, the amount of the gradient and
offset value is shown. If the amount of the gradient value is less
than 50mV / pH or the amount of the offset value is greater
than 60mV, the pH electrode is spent and must be replaced.

4 Return to measurement view:

CAL

MODE

.

.

CAL

.

CAL

.

6. Service and Maintenance

6. Service and Maintenance

29

6.1 Checking electrolyte gel

Check the electrolyte gel in the storage cap regularly for con-

tamination and ensure it is filled to the correct level. Replace
storage cap if necessary.

6.2 Cleaning housing

Clean housing with a damp cloth (soap water) if dirty. Do not

use abrasive cleaning agents or solutions!
TopSafe can also be cleaned in the dishwasher.

6.3 Cleaning probe

Destruction of probe due to incorrect cleaning!

Danger of injury due to glass parts remaining in the
measurement medium.

Use only the cleaning substances stated.

Depending on the type of contamination, the following cleaning
substances are suitable:

- Fat: domestic dishwashing liquid

- Protein: pepsin
The use of warm water improves the cleaning effect.

1. Apply dishwashing liquid or pepsin to a cloth and gently wipe
(do not rub, as this leads to static charging).

2. Rinse the probe with clear warm water.

3. To stabilize the probe, place in the storage solution for at least
1 hour (better 12 hours)..

4. Re-calibrate the probe (see 5.4 Calibrating instrument, page

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6. Service and Maintenance

30

6.4 Changing the module

The instrument must be newly calibrated if a module is
changed (See 5.4 Calibrating instrument, page 28)!

Instrument must be switched off. Plug contacts in the instrument
should not be touched!

1 Unscrew the screws at the back of the instrument.
2 Remove module and attach new module.

There must be rubber sealing rings available for the screws.

Check that the sealing rings are in their correct position.

3 Tighten screws.

6.5 Changing battery

1 Open battery compartment at the back of the instrument.
2 Remove spent button cell and insert new button cell (Type

CR2032, 3V). The (+) symbol should be visible.

3 Close the battery compartment.

7. Questions and Answers

7. Questions and Answers

Question Possible causes Possible solution

Readings instable. Static charge. Rinse off pH electrode
with tap water or
low concentration
soap water.
Air cushion from measurement
electrode gets into measurement downward direction like
tip. with a fever thermometer.
pH electrode has dried out.
several hours in water or
diluted hydrochloric acid.

lights up. Remaining capacity of battery Change battery (See
< 10h. 6.4 Changing battery,

P. 13)
Instrument switches Auto Off function is switched on.

itself off. (See 5.2 Setting
instrument, P. 8)

Er1 lights up. Invalid gradient value
of pH electrode. a new buffer solution
could be used.

without temperature
sensor: check set
temperature value.
pH electrode defective.

Er2 lights up. Invalid offset value Recalibrate instrument,
of the pH electrode. a new buffer solution
could be used.
pH electrode defective.

Er3 lights up. Invalid gradient value Recalibrate instrument,
of pH electrode following a new buffer solution
3 point calibration. could be used.
pH electrode defective.

Shake pH electrode in a

Place pH electrode for

Auto Off.

Recalibrate instrument,

When using a probe

Change probe.

Change probe.

Change probe.

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If we have not answered your question, please contact your near­est distributor or Testo Customer Service point.

For contact data, see back of this document or web page www.
testo.com/service-contact.

8. Technical data32

8. Technical data

Type testo 206-pH1 testo 206-pH2 testo 206-pH3

Parameters pH / °C
Sensor pH electrode / NTC
Measurement range 0 to 14 pH / ±0 to +60 °C

(short-term to +80°C, max. 5min)
Resolution 0.01 pH / 0.1 °C
Accuracy ±0.02 pH / ±0.4 °C
Temperature compensation Automatic Automatic Depending on

external probe
Probe Probe module Probe module BNC module w/

w/ immersion probe w/ penetration probe connection socket
Measuring rate 2/s
Operating temperature ±0 to +60 °C
Storage temperature -20 to +70 °C
Power 1 x button cell, Type CR2032, 3V
Battery life Approx. 80h
Housing Instrument: ABS, TopSafe: PU
Protection Class With TopSafe: IP 68
CE guideline
Dimensions (L x B x H) 110 x 33 x 20 (without probe and Topsafe)
Warranty 2 years, excluding probe modules,

warranty conditions:
see www.testo.com/warranty

2014/30/EU

9. Accessories and Spare Parts

9. Accessories and Spare Parts

Name Item no.

Replacement pH probe for testo 206 pH 1 including gel storage cap 0650 2061
Replacement pH probe for testo 206 pH 2 including gel storage cap 0650 2062
Storage cap for testo 206 pH 1/pH 2 with KCI gel filling 0554 2067
pH universal plastic electrode without temperature sensor for testo 206 pH 3,

including storage/wetting cap 0650 2063
pH universal plastic electrode with temperature sensor for testo 206 pH 3,

including storage/wetting cap 0650 2064
pH glass electrode with temperature sensor for testo 206 pH 3,

including storage/wetting cap 0650 1623
pH food electrode without temperature sensor for testo 206 pH 3,

including storage/wetting cap 0650 0245
Electrolyte solution (50 ml) for storing pH electrodes in the storage/wetting cap 0554 2318
Replacement storage/wetting cap (50 ml) for pH electrodes 0554 0048
Replacement lithium button cell type CR 2032 0515 0028
pH buffer solution 4.01 in dosing bottle (250 ml),

including DAkkS calibration certificate 0554 2061
pH buffer solution 7.00 in dosing bottle (250 ml),

including DAkkS calibration certificate 0554 2063
ISO calibration certificate analysis for pH buffer solutions;

calibration points 4 pH, 7 pH, 10 pH 0520 0007
ISO calibration certificate analysis at 3 pH values over the measuring range 0520 0037

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