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testo 230 · pH- and temperature measuring instrument
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Instruction manual
Visit us at www.TestEquipmentDepot.com
Toll Free 1-800-517-8431
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2
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1 Contents
1 Contents
1 Contents ................................................................................................... 3
2 Safety and the environment .................................................................... 5
2.1. About this document ........................................................................ 5
2.2. Ensure safety ................................................................................... 5
2.3. Protecting the environment .............................................................. 6
3 Specifications .......................................................................................... 7
3.1. Use .................................................................................................. 7
3.2. Technical data ................................................................................. 7
4 Product description ................................................................................. 9
4.1. Overview.......................................................................................... 9
4.1.1. Control elements and connections ................................................................... 9
4.1.2. Display ........................................................................................................... 10
4.2. Connection variants ....................................................................... 11
5 First steps .............................................................................................. 13
5.1. Commissioning .............................................................................. 13
5.1.1. Installing the sensor ....................................................................................... 13
5.1.2. Switching the instrument on ........................................................................... 13
5.2. Calibrating the instrument .............................................................. 14
5.2.1. Single-point calibration ................................................................................... 14
5.2.2. Two-point calibration ...................................................................................... 15
6 Using the product .................................................................................. 17
6.1. Performing settings ........................................................................ 17
6.2. Measuring ...................................................................................... 18
6.2.1. pH-measurement ........................................................................................... 18
6.2.2. Temperature measurement ............................................................................ 19
6.2.3. Redox measurement ...................................................................................... 19
6.2.4. Hold function .................................................................................................. 19
6.2.5. Auto-Hold function ......................................................................................... 20
7 Maintaining the product ........................................................................ 20
7.1. Replacing the battery ..................................................................... 20
7.2. Cleaning the instrument ................................................................. 21
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1 Contents
8
Tips and assistance .............................................................................. 21
8.1. Questions and answers ................................................................ 21
8.2. Accessories and spare parts ......................................................... 24
9 Appendix ................................................................................................ 25
9.1. Electrode/application assignment ................................................. 25
9.2. Buffer table.................................................................................... 28
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2 Safety and the environment
2 Safety and the environment
2.1. About this document
Use
> Please read this documentation through carefully and
familiarize yourself with the product before putting it to use. Pay
particular attention to the safety instructions and warning advice
in order to prevent injuries and damage to the products.
> Keep this document to hand so that you can refer to it when
necessary.
> Hand this documentation on to any subsequent users of the
2.2. Ensure safety
product.
• Temperatures given on probes/sensors relate only to the
measuring range of the sensors. Do not expose handles and
feed lines to temperatures in excess of 70 °C (158 °F), unless
they are expressly permitted for higher temperatures.
• Degree of protection IP 54 is only ensured with the sensor or
blanking plug plugged in.
• Electrolytic solutions are corrosive; do not bring into contact
with measuring instruments or other sensitive surfaces!
• Ether, ester, cetones as well as aromatic or halogenated
hydrocarbons will attack the shaft material and must therefore
not come in contact with the electrode.
• The electrode housing is partly made of glass,
CAUTION, DANGER OF BREAKAGE!
> Only perform maintenance and repair work on this instrument
that is described in the documentation. Strictly follow the
specified steps. Use only original spare parts from Testo.
> Do not store the product together with solvents. Do not use any
desiccants.
> Do not perform any contact measurements on uninsulated, live
parts.
> Dangers may also arise from objects to be measured or the
measuring environment: Always comply with the locally valid
safety regulations when performing measurements.
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2 Safety and the environment
> Only use the product properly, for the purpose it is intended for
and within the parameters specified in the technical data. Do
2.3. Protecting the environment
not apply any force.
> Dispose of faulty rechargeable batteries/spent batteries in
accordance with the valid legal specifications.
> At the end of its useful life, send the product to the separate
collection for electric and electronic devices (observe local
regulations) or return the product to Testo for disposal.
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3 Specifications
3.1. Use
The testo 230 serve the purpose of determining pH-values, redox
potentials and temperature in aqueous solutions as well as in semi-
3.2. Technical data
solid to solid media.
3 Specifications
Instrument
Feature Values
Measurement range pH 0...14, -50...+150 °C, ±1999 mV
Resolution pH 0.01, 0.1 °C (°F), 1 mV
Accuracy
(± 1 digit)
±0.01 pH
±0.4 °C (-50...-25 °C)
±0.2 °C (-25...+75 °C)
±0.4 °C (+75...+100 °C)
±0.5 % of mv (+100...+150 °C)
±1 mV (0…±999 mV)
±2 mV (±999… ±1999 mV)
Temperature
compensation
Operating
man -10...+150 °C
auto -50...+150 °C
0...+40 °C
temperature
Storage/transport
-20...+70 °C
temperature
Display two-line
Connections
BNC compatible socket for pH or pH/°C
resp.
Mini-DIN socket for temperature sensor
Battery life approx. 100 hrs.
Weight 180 g (incl. battery)
Degree of protection
IP 54 (only with plugged in original plug or
blanking plug)
Housing material ABS
Warranty
Terms of warranty see
www.testo.com/warranty
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3 Specifications
Feature Values
Measuring
instrument
Electrode
24 months
12 months
12 months
Sensor
Electrodes/temperature sensors
Feature Values
pH universal plastic
electrode without
temperature sensor (0650
Measurement range: 0...14 pH
Operating temperature: 0...+60 °C
short-term up to +80 °C
2063)
pH universal plastic
electrode with temperature
sensor (0650 2064)
pH glass electrode with
temperature sensor (0650
1623)
pH food electrode without
temperature sensor (0650
Measurement range: 0...14 pH
Operating temperature: 0...+60 °C
Temperature sensor: Pt 1000
Measurement range: 0...14 pH
Operating temperature: -10...+80 °C
Temperature sensor: Pt 1000
Measurement range: 2...14 pH
Operating temperature: 0...+40 °C
0245)
Rugged NTC penetration
food sensor with special
Measurement range: -25...+150 °C
t
: 7 s
99
handle, reinforced PUR line
(0613 2411)
Stainless steel NTC food
sensor (IP65) with PUR line
Measurement range: -50...+150 °C.
t
: 8 s
99
(0613 2211)
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4 Product description
4.1. Overview
4.1.1. Control elements and connections
4 Product description
1 Display see Display page 10
2 Keyboard
Key Function
Switching on/off
To call up individual menu levels
To hold readings or, with manual input function, set
readings
To select menu options or, with manual input
function, set readings
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4 Product description
3 Battery compartment (on rear)
4 BNC connecting socket for pH and redox electrode
4.1.2. Display
5 Mini-DIN connecting socket for NTC temperature sensor
1 Reading (pH/mV, °C for temperature measurements without pH
electrode)
2 DIN/NBS buffer (display in alignment menu)
3 Reading (°C for temperature measurements)
4 Auto-Off display: The circle segments in the display go out in a
2.5 minute interval. After the last segment (10 minutes) the
instrument switches off. Switching off the function, see
Switching Auto-Off on / off page 17.
5 Sensor detection
Icon Function
Man
+Auto
Auto
6 Representation of alignment menu
7 Hold function / Auto-Hold function
8 Battery control:
• When switching on Battery voltage
• In operation: Warning of weak battery
Electrode without temperature sensor
External temperature sensor
Electrode with temperature sensor
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4 Product description
4.2. Connection variants
Measurement Probes function Display
pH /
temperature
measurement
pH-electrode with
integrated
temperature
sensor (0650
1623, 0650 2064)
The pH-electrode is used
to determine pH-value and
temperature of the
medium.
During measurement and
alignment the medium
temperature is
automatically included in
the process.
pH /
temperature
measurement
pH-electrode
without integrated
temperature
sensor (0650
2063, 0650 0245)
NTC-sensor with
Mini-DIN
connection
The pH-electrode is used
to determine the pH-value,
the medium temperature is
measured with the NTCsensor.
During measurement and
alignment the medium
temperature is
automatically included in
the process.
pHmeasurement
pH-electrode
without integrated
temperature
sensor (0650
2063, 0650 0245)
The pH-electrode is used
to determine the pH-value
of the medium.
During measurement and
calibration the medium
temperature must be
entered manually.
Temperature
measurement
NTC-sensor with
Mini-DIN plug
With the NTC-sensor the
testo 230 is a fully
adequate temperature
measuring instrument to
cover the range from
-50 °C ... +150 °C.
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4 Product description
Measurement Probes function Display
1
Redox
measurement
Redox electrode
The redox electrode is
used to determine the
redox potential of the
medium.
With the NTC-sensor the
temperature can
additionally be determined.
However, the temperature
has no influence on the
redox measurement.
1
no longer available
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5 First steps
5.1. Commissioning
5.1.1. Installing the sensor
Before the instrument is switched on the electrode cable must be
connected.
1. Plug the BNC-plug of the electrode into the socket and turn
clockwise to lock.
2. Plug the external NTC-sensor with Mini-DIN plug or blanking
plug into the socket.
IP-protection (IP 54) is only ensured with the NTC-sensor
or blanking plug plugged in.
3. If desired: Fasten the electrode or the NTC-sensor with the
holder on the instrument.
5 First steps
5.1.2. Switching the instrument on
> press I/O.
- The display and function test appears in the display.
- The battery condition is displayed.
- The instrument is ready to use.
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5 First steps
5.2. Calibrating the instrument
Before the first measurement the instrument must generally be
calibrated (singe-point or two-point).
For measurements in extreme solutions (pH-value < 1 and pHvalue > 12), for frequent use and if very high accuracy is required,
5.2.1. Single-point calibration
the unit should be calibrated before each measurement.
Single-point calibration serves the purpose of quickly adapting the
instrument to the electrode.
The following buffers can be used for this purpose:
• Testo buffer pH 4, pH 7, pH 10
• DIN buffer pH 4.008
2
; pH 6.8652; pH 9.18
Also pay attention to the application information for the
buffer used.
1. Connect the electrode to the instrument.
If a plug is present:
> Open the plug on the electrode (to equalise pressure).
2. Pull the rinsing cap off the electrode.
3. Rinse the electrode in water, dab off and place it into the buffer
solution
4. press I/O.
5. press several times, until CAL appears in the display.
- CAL (status bar) flashes in the display.
6. Press SELECT to confirm.
> If an electrode without temperature sensor and no external
temperature sensor is used, enter the temperature manually via
HOLD and SELECT.
- Wait 5 seconds, the instrument accepts the set temperature.
- The display shows bu 1.
7. Press HOLD to select the buffer to be used (pH 1.68 DIN/NBS;
4.00; 4.008 DIN/NBS
2
; 6.865 DIN/NBS2; 7.00; 9.18 DIN/NBS;
10.00).
2
Display reading: DIN/NBS pH 4.01, pH 6.87
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5 First steps
- pH flashes in the display.
8. Press SELECT to start the calibration process.
- During the calibration process CAL is flashing (duration of
calibration min. 20 sec., max 10 min.). An audible signal informs
about the end of the calibration process.
After max. 10 min. the calibration process is aborted, the
electrode is most likely defective, in this case consult our
service department. Contact data see back of this
document or website www.testo.com/service-contact.
- The display shows bu 2. This menu option is needed for twopoint calibration, see Two-point calibration page 15.
9. Press to exit the menu.
- The display shows the default gradient value -58.0mV/pH.
10. Press SELECT to confirm.
- The display shows the unbalancing voltage.
11. Press SELECT to confirm.
- Single-point calibration has been completed.
- The instrument changes to the measurement mode. Measuring
page 18.
5.2.2. Two-point calibration
Two-point calibration serves the purpose of accurately adapting the
instrument to the electrode.
The following buffer sets can be used for calibration:
• Testo buffer set pH 4/7, pH 4/7/10
• DIN buffer set pH 4.008/6.685
Also pay attention to the application information for the
buffer used.
The difference between buffer solutions bu 1 and bu 2
must be higher than 0.64 pH.
1. Connect the electrode to the instrument.
If a plug is present:
> Open the plug on the electrode (to equalise pressure).
2. Pull the rinsing cap carefully off the electrode.
3
Display reading: DIN/NBS pH 4.01, pH 6.87
15
3
, pH 6.865/9.18
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5 First steps
3. Rinse the electrode in water, dab off and place it into the first
buffer solution
4. press I/O.
5. press several times, until CAL appears in the display.
- CAL (status bar) flashes in the display.
6. Press SELECT to confirm.
- The temperature is displayed.
> If an electrode without temperature sensor and no external
temperature sensor is used, enter the temperature manually via
HOLD and SELECT.
- Wait 5 seconds, the instrument accepts the set temperature.
- The display shows bu 1.
7. Press HOLD to select the buffer to be used (pH 1.68 DIN/NBS;
4.00; 4.008 DIN/NBS
3
; 6.865 DIN/NBS3; 7.00; 9.18 DIN/NBS;
10.00).
- pH flashes in the display.
8. Press SELECT to start the calibration process.
- During the calibration process CAL is flashing (duration of
calibration min. 20 sec., max 10 min.). An audible signal informs
about the end of the calibration process.
After max. 10 min. the calibration process is aborted, the
electrode is most likely defective, in this case consult our
service department. Contact data see back of this
document or website www.testo.com/service-contact.
- The display shows bu 2.
9. Rinse the electrode in water, dab off and place it into the
second buffer solution
10. Press HOLD to select the buffer to be used.
11. Press SELECT to start the calibration process.
- During the calibration process CAL is flashing (duration of
calibration min. 20 sec., max. 10 min.). An audible signal
informs about the end of the calibration process.
After max. 10 min. the calibration process is aborted, the
electrode is most likely defective, in this case consult our
service department. Contact data see back of this
document or website www.testo.com/service-contact.
- The display shows the gradient value.
12. Press SELECT to confirm.
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- The display shows the unbalancing voltage.
13. Press SELECT to confirm.
- Two-point calibration has been completed.
- The instrument changes to the pH-measurement mode.
6 Using the product
6.1. Performing settings
Measuring page 18.
testo 230 has a configuration menu in which the following
successive settings can be made:
1 Change measuring unit from °C to °F and vice-versa.
2 Switch Auto-Off function on or off.
3 In Clear mode the values saved by an alignment can be
overwritten, e.g. if the electrode needs to be changed and an
alignment is not possible.
Changing the unit
6 Using the product
✓ The instrument is switched off.
1. Keep HOLD depressed and tap I/O instantaneously.
2. Keep HOLD depressed, until the segment test is finished.
- °C or °F flashes in the display.
3. Use SELECT to set the desired unit.
4. Press HOLD to confirm.
- Off (Auto-Off) flashes in the display.
Switching Auto-Off on / off
The Auto-Off function prolongs the lifetime of the battery
and protects the environment. Always make sure that the
instrument is switched off when the Auto-Off function is
disabled.
5. Press SELECT to switch the Auto-Off on (on) or off (off).
6. Press HOLD to confirm.
- The display shows clr no (flashing).
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6 Using the product
Performing a reset (Clear mode)
7. Press SELECT to select yes.
> If no is selected, the previous values will be maintained.
8. Press HOLD to acknowledge.
- The previously valid values will be deleted and the ideal values
(-58 mv/pH and 0 mV) will be saved in the instrument.
6.2. Measuring
- The instrument changes to the measurement mode.
6.2.1. pH-measurement
✓ Single or two-point alignment has been made, see Calibrating
the instrument page 14.
1. Connect the electrode to the instrument.
If a plug is present:
> Open the plug on the electrode (to equalise pressure).
2. Pull the rinsing cap off the electrode.
3. Rinse the electrode in water and dab off (see also operating
instructions for pH-electrodes).
4. Place the electrode into the measuring solution.
5. press I/O.
- The display shows pH-value (initially unstable) and
temperature. If the display reading is stable, the measuring
value is correct.
If an electrode without temperature sensor and no external
temperature sensor is used, enter the temperature manually.
1. Press SELECT.
- MAN flashes in the display.
2. Press HOLD and SELECT to correct the value upwards or
downwards.
- Wait 5 seconds, the instrument accepts the set temperature.
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6.2.2. Temperature measurement
✓ NTC sensor connected.
1. Place the NTC sensor into the measuring solution.
2. Press I/O.
Press three times.
3.
- The temperature is displayed. If the display reading is stable,
the measuring value is correct.
Back to the pH measurement menu:
6 Using the product
> Press two times.
6.2.3. Redox measurement
✓ Redox electrode connected.
1. Place the redox electrode into the measuring solution.
2. Press I/O.
Press two times.
3.
- The redox potential (initially unstable) is displayed. If the display
reading is stable, the measuring value is correct.
Back to the pH measurement menu:
> Press two times.
6.2.4. Hold function
With HOLD the reading can be held during a progressing
measurement.
> Press HOLD.
- The display shows Hold besides the reading.
- The reading is held in the display as long as desired, the AutoOff function is disabled.
Quit:
> Press HOLD.
- The current reading is shown.
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7 Maintaining the product
6.2.5. Auto-Hold function
The Auto-Hold function monitors the setting time during a
measurement. Once the reading is stable, this status is indicated
both visually and audibly.
1. Start measuring process (see Measuring Seite 18).
2. Press to select Auto-Hold.
- Hold flashes in the display.
- Once the reading is stable a signal will sound, the reading and
Hold are permanently displayed. The measuring process is
completed.
- If the reading does not become stable within 10 minutes, the
display will show ERR 6 (see Questions and answers page 21).
Return to measuring mode:
7 Maintaining the product
7.1. Replacing the battery
> Press HOLD.
The battery voltage is displayed whenever the instrument is
switched on. If the battery voltage is low, the message BAT
will appear in the display when measuring.
Do not damage the instrument seal.
20
1. Open the battery compartment.
2. Replace the battery with a new battery of the same type
(type 9 V IEC 6 F 22). Observe the polarity!
3. Close the battery compartment.
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7.2. Cleaning the instrument
> Clean the housing with a damp cloth. Mild household cleaning
agents may be used.
> Never use aggressive cleaning agents or solvents for cleaning.
> The instrument is suitable for contact with weak acids and
alkaline solutions. After use in aggressive environments the
8 Tips and assistance
8.1. Questions and answers
instrument must be cleaned with a damp cloth.
For care and maintenance of the pH-electrodes you should
read the operating instructions "testo pH-electrode".
Question Possible causes / solution
Err 1
The pH reading is not in the range 0...14 pH.
• No pH-electrode connected.
> Connect a pH-electrode.
• Incorrectly calibrated.
> Recalibrate.
• pH-electrode defective.
> Check the pH-electrode, replace if
necessary.
• Low pH-value when using electrode with high
gradient and unbalancing voltageand, at the
same time, high measuring temperature.
> reduce the measuring temperature
8 Tips and assistance
The mV reading is not in the range of
-1999…+1999 mV.
• No electrode connected.
> Connect an electrode.
• Redox electrode defective.
> Check the electrode, replace if necessary.
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8 Tips and assistance
Question Possible causes / solution
Err 2 • Temperature range of the instrument
Err 3 • Temperature range exceeded during
Err 4 • Gradient of electrode outside the range
Err 5 • Neutral point of electrode outside the range
Err 6 Electrode setting time too long (in Auto-Hold or
Err 7 • Internal instrument fault, measuring
exceeded. Temperature < -50 °C or
> +150 °C.
> Remove the sensor from the measuring
medium.
calibration. Temperature of buffer solution
outside permissible range.
> Abort calibration by pressing
the last calibration are maintained).
> Repeat the calibration with adapted
temperature.
-50 mV/pH...-62 mV/pH, electrode defective.
> Abort calibration by pressing (the values of
the last calibration are maintained).
> Use a new electrode.
-60...+60 mV, electrode defective.
> Abort calibration by pressing (the values of
the last calibration are maintained).
> Use a new electrode.
when calibrating):
• Electrode dirty.
• Electrode defective.
> Delete error message by pressing
calibration with
calibration are maintained).
> Rinse the electrodes and repeat the process.
If the error occurs again, use a new
electrode.
instrument defective.
> Consult the Testo Customer Service or your
dealer.
, the values of the last
(the values of
(abort
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8 Tips and assistance
Question Possible causes / solution
Unstable display • Air bubbles in the glass bowl
> Tap the electrode lightly with your fingers or
perform circular movements with the
electrode.
• Air bubbles in the KCI-crystals
> Tap the electrode lightly with your fingers or
perform circular movements with the
electrode.
> Heat the electrode up in a 60 °C water bath,
until a sufficient amount of KCI has been
dissolved and the air bubbles have
disappeared.
• Poor connection
> Check cable connection.
• Sample solution with poor ionic strength (e.g.
partly aqueous solution)
> Use the electrode 0650 1623.
Low gradient
and / or slow
response
• Calibration fault caused by old buffers
> Use fresh high quality buffers for calibration.
• Glass membrane contaminated
> Clean the glass ball with soft paper or a lens
cleaning cloth and allow the electrode
membrane to swell in pH 4.0 buffer.
> Clean the electrode in tap water and rinse
with distilled water. Then allow the electrode
to swell for 30 minutes in buffer pH 4.0 while
stirring and with the KCI filler opening open.
Drifting potential • Contamination with oil or grease
• Sulphide contamination of the porous pin
> Clean the electrode with a water-miscible
solvent (e.g. acetone), then rinse the
electrode with warm, distilled water.
• Allow the electrode to swell over a period of
24 hours in a solution of thiocarbamide in
0.1M HCI and finally rinse with distilled water.
If we have not answered your question, please contact your local
dealer or Testo´s Customer Service. Contact data see back of this
document or website www.testo.com/service-contact.
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8 Tips and assistance
8.2. Accessories and spare parts
Description Article no.
Electrodes and sensors
pH universal plastic electrode without
temperature sensor
pH glass electrode with temperature sensor 0650 1623
pH food electrode without temperature sensor 0650 0245
pH universal plastic electrode with
temperature sensor
Stainless steel NTC food sensor (IP65) with
PUR line
Rugged NTC penetration food probe with
special handle, reinforced PU line
Storage and refill solutions
Storage solution; (50 ml) for electrode 0650
0245
0650 2063
0650 2064
0613 2211
0613 2411
0554 2318
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9 Appendix
9 Appendix
9.1. Electrode/application assignment
Key: - unsuitable, 0 suitable with reservations, + well suitable
New type
designation
Old type
designation
Application
Waste water
samples
General aqueous
media
Aquarium + + + + + 0
Beer, fruit juices,
wine
Yoghurt, cheese - + - +
Proteinaceous
media
Emulsions,
aqueous
Emulsions, partly
aqueous
Soil (suspension) 0 + - 0 0 +
Extreme pHvalues (pH<1,
>13)
0650
2063
Type
01
0650
1623
–
0650
0245
Type
13
0650
2064
–
– – – –
Type
02
Type
4
035
Type
046
Type
4
05
+ + + 0 + +
+ + + + + +
0 + 0 0 0 +
- 0 + - - + - 0
+ 0 +
+ - +
0 0 - 0 - 0 +
4
No longer available, please check whether 0650 1623 is suitable for the
application
5
No longer available, please check whether 0650 0245 is suitable for the
application
6
No longer available, please check whether 0650 2064 is suitable for the
application
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9 Appendix
New type
designation
Old type
designation
0650
2063
Type
01
0650
1623
–
0650
0245
Type
13
0650
2064
–
– – – –
Type
02
Type
4
035
Type
046
Type
4
05
Application
Meat in the
- - + - - 0 - -
puncture
Fruit, vegetable in
- - + - - 0 - -
the puncture
Hydrofluoric acid
- - - 0 - - 0
containing media
Plating-shop
+ - +
waste
Hot alkaline
- 0 - 0 - - -
solutions
Highly viscous
0 - 0 0 -
solutions
Infusions + 0 0 +
Low ion media - 0 0 0 0 0
Jam - + - + -
Cosmetics 0 0 -
Leather, paper 0 - - 0 0 +
Milk + + + 0 +
Ultrapure water,
- + 0 0 0 0
rain water
Cream, stirred
0 + - 0 +
yoghurt
Brine 0 + + + + +
Swimming pool + + + + + +
Soaps, detergents + - +
Suspensions,
+ - +
aqueous
Suspensions,
+ - +
partly aqueous
Dough, bread - + - + -
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9 Appendix
New type
designation
Old type
designation
Application
Partly aqueous
solutions, > 10 %
H2O
Partly aqueous
solutions, < 10 %
H
O
2
pH-measurement
at temperatures
up to 100 °C
Tris buffer
solutions
In case of special demands and after special consultation special
electrodes are available for the following applications:
• Lacquers and paints
• highly viscous solutions
• photographic solutions
• measurements on clean surfaces and for measurements at
0650
2063
Type
01
0650
1623
–
0650
0245
Type
13
0650
2064
–
– – – –
Type
02
Type
4
035
Type
046
+ - 0 +
0 - 0
- - - + - - -
0 + + 0 - 0 +
T < 0 °C.
Type
4
05
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9 Appendix
9.2. Buffer table
The table below lists the temperature related changes to the
buffers. (DIN buffer acc. to DIN 19266)
DIN buffer Testo buffer
°C 1.685 4.006 6.865 9.180 4.00 7.00 10.00
10 1.670 4.000 6.923 9.332 4.00 7.07 10.18
15 1.672 3.999 6.900 9.276 4.00 7.04 10.14
20 1.675 4.001 6.881 9.225 4.00 7.02 10.06
25 1.679 4.006 6.865 9.180 4.00 7.00 10.00
30 1.683 4.012 6.853 9.139 4.01 6.99 9.95
35 1.688 4.021 6.844 9.102 4.02 6.98 9.91
38 1.691 4.027 6.840 9.081
40 1.694 4.031 6.838 9.068 4.03 6.97 9.85
45 1.700 4.043 6.834 9.038
50 1.707 4.057 6.833 9.011 4.05 6.96 9.78
55 1.715 4.071 6.834 8.985
60 1.723 4.087 6.836 8.962 4.08 6.96 9.75
In the calibration this is automatically accounted for.
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