TESTO 205 User manual

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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- 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: CAL .
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.
3 Return to measurement view: CAL .
5. Operation 25
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6. Service and Maintenance26
6. Service and Maintenance
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!
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 24).
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6.4 Changing the probe
The instrument must be newly calibrated once a probe has
been changed (See 5.4 Calibrating instrument, page 24)!
Instrument must be switched off. Plug contacts in the instrument
should not be touched!
1 Turn screw ring anti-clockwise and remove probe.
2 Attach new probe (watch for guide groove) and tighten screw
ring in a clockwise direction.
6.5 Changing battery
1 Pull out battery compartment.
2 Remove spent batteries and insert new
batteries (4 x Type LR44). Watch out for
+/-.
3 Reinsert battery compartment.
6. Service and Maintenance 27
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7. Questions and Answers28
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 Shake pH electrode in a
electrode gets into measurement downward direction like
tip. with a fever thermometer.
pH electrode has dried out. Place pH electrode for
several hours in water or
diluted hydrochloric acid.
lights up. Remaining capacity of battery Change battery (See
< 10h. 6.4 Changing battery,
P. 11)
Instrument switches Auto Off function is switched on. Auto Off.
itself off. (See 5.2 Setting
instrument, P. 8)
Er1 lights up. Invalid gradient value Recalibrate instrument,
of pH electrode. a new buffer solution
could be used.
pH electrode defective. Change probe.
Er2 lights up. Invalid offset value Recalibrate instrument,
of the pH electrode. a new buffer solution
could be used.
pH electrode defective. Change probe.
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. Change probe.
Er4 lights up. Probe not inserted correctly. Check connection.
pH electrode defective. Change probe.
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
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8 Technical data 29
8. Technical data
Feature Values
Parameters pH / °C
Sensor pH electrodes / NTC
Measurement range 0 to 14 pH / ±0 to +60 °C (short-term to +80 °C, max. 5 min)
Resolution 0.01 pH / 0.1 °C
Accuracy ±0.02 pH / ±0.4 °C
Temperature compensation Auto-
matic
Probe Probe module
Measuring rate 2/s
Operating temperature ±0 to +50 °C
Storage temperature -20 to +70 °C
Power 4 x button cell, Type LR44
Battery life Approx.80h
Housing ABS
Protection class IP 65
CE guideline 2004/108/EEC
Dimensions (l x w x h) 145 mm x 38 mm x 167 mm
Warranty 2 years, excluding probe modules, warranty conditions:
see www.testo.com/warranty
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9. Accessories and Spare Parts
Name Item no.
Replacement pH probe for testo 205 including gel storage cap 0650 2051
Storage cap for testo 205 with KCI gel filling 0554 2051
Button cells 1.5 V (4 pcs.), battery type LR44 0515 0032
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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