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testo 270 · Deep-frying Oil Tester
Instruction manual
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1 Contents
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Practical tips before commissioning your new testo 270
Dear Customer,
Congratulations on purchasing your new testo 270 cooking oil tester.
All our measuring instruments are factory tested by us before delivery and
adjusted to their own specific level of accuracy. To ensure a consistently high
level of accuracy, we recommend the instrument is regularly checked.
You have the following options with the testo 270 cooking oil tester:
1 Testo factory calibration according to ISO (accuracy +/- 2% TPM
You can order an ISO calibration from Testo's calibration subsidiary, Testo
Industrial Services in Kirchzarten, using order number 0520 0028. This
means your testo 270 will be calibrated at two points (at approx. 3% and at
approx. 24% TPM) under precise laboratory conditions.
Furthermore, you have the following options for checking your testo 270 yourself
at any time:
2 with Testo reference oil (accuracy +/- 2.5% TPM
With the Testo reference oil (order no. 0554 2650), you can check the
measuring instrument precisely and, if necessary, readjust it (please pay
attention to the description in the instruction manual for this).
3 with the simple function test in cooking oil (accuracy +/- 3% TPM
For a simple function test without adjustment, we recommend you carry out
a measurement during the commissioning of your new instrument in unused
cooking oil at 150 to 180 °C.
You should ideally carry out this measurement several times in succession
and note the respective readings. The mean value of these readings
represents your specific reference value for subsequent instrument
checking. To use the determined reference value as a comparative value for
a check, always carry out the measurement for instrument checking in
unused cooking oil at 150 to 180 °C.
Please make sure that the reference value is recalculated if the type of oil or
oil supplier changes.
Your specific reference value:
___________________________
1
):
1
):
1
):
1
typically, based on Testo in-house reference, at an ambient temperature of
25 °C.
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1 Contents
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1 Contents
1 Contents .................................................................................................. 4
2 Safety and the environment ................................................................... 5
2.1. About this document ....................................................................... 5
2.2. Ensure safety .................................................................................. 6
2.3. Protecting the environment ............................................................. 7
3 Specifications .......................................................................................... 8
3.1. Use ................................................................................................. 8
3.2. Technical data ................................................................................. 8
4 Product description .............................................................................. 10
4.1. Overview ....................................................................................... 10
4.2. Basic properties ............................................................................ 12
5 First steps .............................................................................................. 13
5.1. Commissioning ............................................................................. 13
5.2. Getting to know the product .......................................................... 15
5.2.1. Switching the instrument on/off ...................................................................... 15
5.2.2. Description of important functions and displays ............................................. 16
5.2.2.1. Alarm indicator ................................................................................ 16
5.2.2.2. Setting the TPM limit values ............................................................ 16
5.2.2.3. Hold function ................................................................................... 17
5.2.2.4. Auto-Hold function ........................................................................... 17
5.2.2.5. Auto-off function .............................................................................. 17
5.2.2.6. Battery capacity ............................................................................... 18
5.2.3. Configuring the instrument ............................................................................. 18
5.2.4. Locking / unlocking configurations ................................................................. 20
6 Using the product ................................................................................. 22
6.1. General measurement information ................................................ 22
6.2. Carrying out measurements .......................................................... 23
6.3. Function test ................................................................................. 25
7 Maintaining the product ....................................................................... 26
7.1. Changing batteries ........................................................................ 26
7.2. Cleaning the sensor ...................................................................... 26
7.3. Cleaning the housing .................................................................... 27
7.4. Cleaning the plastic case .............................................................. 27
7.5. Calibrating/adjusting the instrument .............................................. 28
8 Tips and assistance .............................................................................. 32
8.1. Questions and answers ................................................................ 32
8.2. Accessories and spare parts ......................................................... 33
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2 Safety and the environment
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2 Safety and the environment
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2.1. About this document
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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
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product.
Warnings
Always pay attention to information that is marked by the following
warnings with warning pictograms. Implement the specified
precautionary measures.
Representation Explanation
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WARNING
NOTICE
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Indicates potential serious injuries
indicates circumstances that may lead to
damage to the products
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2 Safety and the environment
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Symbols and writing standards
Represen-
Explanation
tation
Note: Basic or further information.
1. ...
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2. ...
> ... Action: a step or an optional step.
- ... Result of an action.
Action: more steps, the sequence must be followed.
Menu Elements of the instrument, the instrument displays
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or the program interface.
[OK] Control keys of the instrument or buttons of the
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2.2. Ensure safety
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... | ... Functions/paths within a menu.
“...” Example entries
program interface.
> Only operate the product properly, for its intended purpose and
within the parameters specified in the technical data. Do not
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use any force.
> Do not operate the instrument if there are signs of damage at
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the housing, mains unit or feed lines.
> The objects to be measured or the measurement environment
may also pose risks: Note the safety regulations valid in your
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area when performing the measurements.
> Temperatures given on probes/sensors relate only to the
measuring range of the sensors. Do not expose handles and
feed lines to any temperatures in excess of 70 °C unless they
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are expressly permitted for higher temperatures.
> Do not perform contact measurements on non-insulated, live
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parts.
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> Transport and store the instrument exclusively in the aluminium
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case provided in order to avoid damage to the sensor.
> Do not store the product together with solvents. Do not use any
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desiccants.
> Carry out only the maintenance and repair work on this
instrument that is described in the documentation. Follow the
prescribed steps exactly. Use only original spare parts from
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2.3. Protecting the environment
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Testo.
> Dispose of faulty rechargeable batteries/spent batteries in
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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
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regulations) or return the product to Testo for disposal.
2 Safety and the environment
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3 Specifications
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3 Specifications
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3.1. Use
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The testo 270 is a handy measuring instrument for fast testing of
cooking oils.
The TPM value (total polar materials) enables a statement on the
ageing of cooking oils due to the effects of heat.
The following measuring tasks can be performed with the testo
270:
• Displaying the temperature of the cooking oil:
Indicator for correct setting of the deep fat fryer, checking of
integrated temperature displays.
• Displaying the TPM value:
Indicator for the ageing of the cooking oil.
The sensor works on a capacitive basis and determines as the
reading the total polar materials as a %.
The free fatty acids, which are determined above all for the
evaluation of unloaded oils (rancidity), cannot be detected with the
testo 270.
The temperature of the cooking oil to be measured must be
at least 40 °C. The maximum operating temperature is
200 °C.
The sensor and the probe tube are designed to come into
contact with oil used in deep fat fryers for the typical
duration of a spot check measurement. The materials used
in these components meet the relevant requirements in the
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Regulation (EC)1935/2004.
3.2. Technical data
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Feature Values
Measuring range
Temperature: 40.0 to 200.0 °C /
104.0 to 392.0°F
TPM: 0 to 40%
Accuracy Temperature: ± 1.5 °C
2
TPM
: ±2% (40.0 to 190.0 °C / 104 to 374 °F)
2
typically, based on Testo in-house reference, at an ambient temperature of
25 °C.
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3 Specifications
Feature Values
Resolution Temperature: 0.1 °C / 0.1 °F
TPM: 0.5%
Power supply Batteries: 2x micro (type AAA)
Battery (micro AAA) Designation according to IEC: LR03
Chem. composition: Zn-MnO2 (alkaline)
Battery life at 20 °C
Approx. 25 hrs continuous operation
(corresponds to 500 measurements) without
display illumination
Temperature
PTC
sensor
TPM sensor Capacitive sensor (Testo)
Operating
0 to 50 °C / 32 to 122 °F
temperature
Ambient humidity 0 to 90%RH
Storage/transport
-20 to 70 °C / -4 to 158 °F
temperature
Display LCD, 2-line, display illumination
Weight 255 g
Housing material
Top part: ABS
Lower part: ABS-PC glass fibre 10%
Dimensions
Approx. 50 mm x 170 mm x 300 mm
(WxHxD)
TPM response time Approx. 30 secs
Protection class IP65
Warranty 24 months
EC Directive 2014/30/EC
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4 Product description
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4 Product description
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4.1. Overview
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10
1 Display
2 Control keys
3 Battery compartment
4 Probe shaft
5 Oil quality (%TPM) and temperature sensor
6 Min. immersion depth
7 Max. immersion depth
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4 Product description
Items shown on the display:
Items shown Function/property
200 (flashing
temperature value
> 200 °C)
40 (flashing
temperature value
< 40 °C)
Alarm
PIN
Alarm
Alarm
Hold
Auto-Hold
°C / °F
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Important display messages
Item shown on the
display
000 lights up Instrument is ready to measure, sensor is not
Reading >190
flashes
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Temperature measuring range exceeded
Temperature measuring range undershot
Alarm indicator activated
Configuration mode locked
Battery capacity 100 %
Battery capacity 66 %
Battery capacity 33 %
Battery capacity < 10 %
Upper TPM limit value exceeded
Lower TPM limit value exceeded
Readings held (manually)
Readings held (automatically)
Temperature in °C or °F
Explanation
in oil.
Measured temperature is above 190 °C
(374 °F). The reading flashes in the range
from 190.1 °C (374 °F) to 200 °C (392 °F).
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4 Product description
Control keys
Buttons Function/property
[ ]
[Hold]
[ ] • on/off; yes/no - Configure instrument
[ ] • on/off; yes/no - Configure instrument
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Battery compartment
• Switch instrument on/off
• Configure instrument
• Hold measuring values manually
• Switch to the measuring mode
• Configure instrument
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4.2. Basic properties
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Power supply
The power is supplied to the instrument via two micro batteries
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(type AAA). The batteries are included in the delivery.
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5 First steps
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5.1. Commissioning
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Inserting batteries
CAUTION
Incorrectly inserted batteries can damage the instrument!
> Adhere to the polarity when inserting the batteries.
1. Undo the screw on the battery compartment.
5 First steps
2. Remove the battery holder.
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5 First steps
3. Insert batteries. Adhere to the polarity.
4. Insert the battery holder into the battery compartment.
5. Secure battery compartment with screw.
6. Switch instrument on: Press [ ].
- Display test is carried out: all segments light up.
- The instrument switches to the measuring mode.
- 000 lights up on the display, the instrument is ready for use.
7. If necessary, switch instrument off.
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5 First steps
For storage of the instrument
Suspension attachment
> The integrated suspension attachment can be used to hang the
instrument on a hook.
Plastic case
- The instrument is securely stored in a plastic case for protection
against contamination and for transport.
5.2. Getting to know the product
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5.2.1. Switching the instrument on/off
To switch on
> Press [ ] until the indicator elements appear in the display.
- Display test is carried out: all segments light up.
- The instrument switches to the measuring mode and is ready
for operation.
To switch off
> Press and hold [ ] for approx. 2 secs.
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15
- Display goes off, instrument switches off.
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5 First steps
5.2.2. Description of important functions and displays
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5.2.2.1. Alarm indicator
The alarm indicator uses the following display colours to show what
range the measured TPM value is in:
Green TPM value < lower limit value
Orange TPM value is between the lower and the upper limit value
Red TPM value > upper limit value
The alarm indicator is switched on when the instrument is
delivered. The TPM limit values are set as follows (only for the
standard set, order no. 0563 2750):
Lower limit value 20%
Upper limit value 24%
To activate/deactivate the alarm indicator, see Configuring the
instrument, page 18.
To set the TPM limit values, see Setting the TPM limit values, page
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16.
5.2.2.2. Setting the TPM limit values
The TPM limit values can be between 0 and 40%. The
upper limit value (Alarm ) must be at least 1% higher than
the lower limit value (Alarm ).
In order to apply the settings of the lower and upper TPM
limit value, you must make sure you confirm the input of the
upper TPM limit value with [Hold].
16
Setting the lower TPM limit value
Requirement: Instrument is in configuration mode, See also
Carrying out the configuration, page 19.
1. Alarm and the set lower limit value appear on the display.
- When alarm indicator is activated: the display lights up orange.
2. Set the lower limit value with [ ] or [ ].
3. Confirm with [Hold].
- New lower limit value is applied.
- The instrument switches to the upper TPM limit value (Alarm ).
Page 17
Setting the upper TPM limit value
Requirement: Instrument is in configuration mode,
lower TPM limit value has been set and confirmed with [Hold] .
1. Alarm and the set upper limit value appear on the display.
- When alarm indicator is activated: the display lights up red.
2. Set the upper limit value with [ ] or [ ].
3. Confirm with [Hold].
- New upper limit value is applied.
> Carry out further settings in the configuration menu or quit the
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configuration menu with [ ].
5.2.2.3. Hold function
Measured values can be held manually.
Requirement: Sensor is in the oil.
1. Briefly press [Hold] (< 1 sec).
- Hold appears in the display.
- Readings are held.
2. To switch to the measuring mode: Briefly press [Hold] (<
1 sec).
- Hold function is deactivated.
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- Current readings are displayed.
5 First steps
5.2.2.4. Auto-Hold function
When the Auto-Hold function is activated, the measured values
are automatically held by the instrument after the equalization
period.
To activate/deactivate the Auto-Hold function, see Carrying out the
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configuration, page 19
5.2.2.5. Auto-off function
When the Auto-off function is activated, the instrument
automatically switches off after a certain time
• If the instrument is in measuring mode: automatic switch-off
after 2 mins.
• If the instrument is in hold or configuration mode: automatic
switch-off after 10 mins.
To activate/deactivate the Auto-off function, see Configuring the
instrument, page 18
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5 First steps
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5.2.2.6. Battery capacity
With decreasing battery capacity, a symbol lights up in the display (
). If the empty battery symbol ( ) flashes in the display, the
remaining capacity is only approx. 30 min.
If the battery voltage is too low, the instrument automatically
switches off.
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> Change batteries, see Changing batteries, page 26
5.2.3. Configuring the instrument
Setting options in the configuration mode
Configurations Setting options
Setting the TPM limit values
Alarm , Alarm
Carry out calibration
CAL
Automatically hold readings
Auto-Hold
Lower TPM limit value Alarm
Upper TPM limit value Alarm
no: Do not carry out calibration.
yes: Carry out calibration.
on: Readings are automatically
held by the instrument.
off: Readings are not
automatically held.
Automatically switch off the
instrument Auto-off
on: Instrument switches off
automatically after 2 or 10 mins.
off: No automatic switch-off.
Set alarm indicator
Alarm
Set temperature unit
on: Alarm indicator activated
off: Alarm indicator deactivated
°C or °F
°C, °F
Lock configuration, including
TPM limit values
no: Do not lock configuration.
yes: Lock configuration
PIN
Carry out reset
rst
no: Do not reset the adjustment
value to the factory setting.
yes: Reset the adjustment value
to the factory settings.
Firmware version
Firmware versions of the product
components are shown.
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5 First steps
Carrying out the configuration
Requirement: The instrument is switched off.
1. Switch the instrument on.
> Switch the instrument on, press [Hold] during the display
test and hold down for approx. 2 secs.
- When the configuration menu is locked, PIN lights up.
> To unlock, set the last two figures of the serial number with [
] or [ ].
If an incorrect PIN is entered, the instrument switches into
measuring mode.
- When the configuration menu is not locked, you can gain
access by setting the limit values.
2. Set the alarm limit values.
- Alarm lights up in the display.
> Set lower limit value (Alarm ): [ ] or [ ] and confirm with
[Hold].
- Alarm lights up in the display.
> Set upper limit value (Alarm ): [ ] or [ ] and confirm with
[Hold].
3. Carry out / do not carry out calibration.
- CAL and no or yes light up in the display.
> Activate / deactivate calibration / adjustment function (no is
the standard setting): [ ] or [ ] and confirm with [Hold].
- Selection of yes: The instrument can be calibrated /
adjusted, see Calibrating/adjusting the instrument, page 28
- Selection of no: No calibration / adjustment possible
4. Automatically hold readings.
- Auto-Hold and on or off light up in the display.
> Switch Auto-Hold on or off: [ ] or [ ] and confirm with
[Hold].
5. Automatically switch the instrument off.
- Auto-off and on or off light up in the display.
> Switch Auto-off on or off: [ ] or [ ] and confirm with
[Hold].
19
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5 First steps
6. Set alarm indicator
7. Set the temperature unit.
8. Enable / disable PIN.
9. Carry out reset.
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Quitting configuration mode early and saving
You can quit the configuration mode early.
> Quit configuration mode early: Press and hold [ ] for approx.
- Configuration mode is stopped.
- The values which have so far been set and confirmed with
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- The instrument switches to the measuring mode.
- Alarm and on or off light up in the display.
> Switch alarm indicator on or off: [ ] or [ ] and confirm with
[Hold].
- °C or °F lights up in the display.
> Set the temperature unit (°C/°F): [ ] or [ ] and confirm
with [Hold].
- PIN and yes or no light up in the display.
> Activate PIN (yes) or deactivate it (no is the standard
setting).
- rst and yes or no light up.
> Activate or deactivate rst: [ ] or [ ].
- Selection of yes: Delete adjustment value, is reset to the
factory setting.)
- Selection of no: no reset, adjustment value is retained).
The configuration mode cannot be stopped in the
adjustment / calibration process.
1 sec.
[Hold] are applied.
5.2.4. Locking / unlocking configurations
You can lock/unlock the set values, including TPM limit values,
from the configuration mode. The instrument is delivered with the
configuration mode unlocked (PIN is deactivated, no).
Requirements: Instrument is in configuration mode.
> Go through the configuration mode with [Hold], until PIN
and yes or no light up in the display.
Lock configuration mode
> Activate PIN: Select yes with [ ] or [ ].
- PIN is activated and the configuration mode is locked.
20
Page 21
The last two figures of the instrument's serial number are
automatically set as the PIN (see sticker on the instrument).
Unlock configuration mode
Requirement: PIN is activated and the instrument is in configuration
mode.
Enter PIN:
> Select first figure: [ ] or [ ] and confirm with [Hold].
> Select second figure: [ ] or [ ] and confirm with [Hold].
If an incorrect PIN is entered, the instrument switches into
measuring mode.
- The configuration mode is enabled for the duration of the
settings being carried out.
Deactivate PIN:
> Go through the configuration mode with [Hold], until PIN
and yes or no light up in the display.
> Deactivate PIN: Select no with [ ] or [ ].
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- Settings can be carried out without entering the PIN.
5 First steps
21
Page 22
6 Using the product
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6 Using the product
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6.1. General measurement information
The testo 270 enables several measurements to be carried out one
immediately after the other without any waiting times.
Which oils/cooking fats can be measured?
In principle, all oils and fats intended for deep fat frying can be
measured.
This includes, for example, rapeseed, soya bean, sesame, palm,
olive, cotton seed or groundnut oil. Fats from animal sources can
also be measured. There may be a variation of several percentage
points in the % TPM value for fresh cooking oils, depending on the
type.
The maximum service life for the cooking oil cannot be derived
from this.
Example: Fresh palm oil has a higher % TPM value than other
cooking oils, but ages considerably more slowly.
Use of additives
The testo 270 is designed for the use of pure fats/oils. If additives
are used, deviations may occur.
22
Comparison of laboratory methods / testo 270
Cooking oil is a mixture of substances with a wide variety of
polarities. During ageing, the proportion of more highly polar
components increases. The laboratory method of column
chromatography separates the fat into a polar and a non-polar
group. The proportion of the polar group compared to the total
amount of cooking oil being investigated is described as the
% TPM value (total polar materials).
The % TPM value established by column chromatography may
vary slightly depending on the setting of the separation limit
between the polar and the non-polar group.
Depending on the type of fat, slight variations of the polarity in both
groups (polar/non-polar) may occur which are not however
identified by the chromatography.
On the other hand, the testo 270 records the entire polarity of the
cooking oil and thus the actual polarity of both groups (polar/nonpolar). This means the reading of the testo 270 may be higher or
lower than that of the column chromatography in individual cases.
Page 23
An example of this is coconut oil, for which the testo 270 shows
WARNING
higher TPM values than column chromatography. However, this fat
is unsuitable for deep fat frying and is therefore primarily used for
roasting.
Free fatty acids
The testo 270 measures the total amount of polar materials in the
cooking fat (% TPM) which makes it very possible to evaluate the
load of the oil as a result of deep fat frying. On the other hand, free
fatty acids (FFAs) are used for the evaluation of the age of the fat
during storage. FFAs are not suitable for identifying the thermal
loads of the oil. FFAs cannot be measured with the testo 270.
Polymeric triglycerides (PTGs)
Polymeric triglycerides are also being used for the evaluation of
cooking oils with increasing frequency. The results of this method
are in most cases comparable with the % TPM value.
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6.2. Carrying out measurements
PTG ≈ % TPM/2
Risk of burns due to hot instrument parts (sensor and probe
shaft)!
> Do not touch hot instrument parts with your hands.
> In the event of burns, immediately cool the relevant spot with
cold water and see a doctor if necessary.
Please take note of the following information in order to
obtain correct measurement results:
• Take the product being deep fried out of the oil and wait
5 mins until there are no more bubbles rising before
measuring.
• If you suspect a measurement error due to water being
contained: Repeat the measurement after 5 mins (do
not deep fry during this time, keep oil/fat at a high
temperature). If the new reading is lower, measure
again after 5 mins until the reading stabilises if
necessary.
• Keep the sensor away from metallic parts (e.g. deepfrying basket, pan walls), as these may affect the
measurement result. Minimum distance from metal
parts: 1 cm on each side.
6 Using the product
23
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6 Using the product
With activated Auto Hold function
1. Immerse the sensor in cooking oil. Adhere to the immersion
- If the temperature is within the permissible measuring range (40
2. Wait until Auto Hold is shown in the display.
- Readings are automatically held by the instrument, with the
3. Read the measurement values.
4. To switch to the measuring mode: Briefly press [Hold] (<
With deactivated Auto Hold function
1. Immerse the sensor in cooking oil. Adhere to the immersion
2. If the temperature is within the permissible measuring range (40
- Readings are displayed.
- Measurement is finished when the temperature display no
3. To hold readings: Briefly press [Hold] (< 1 sec).
- Hold appears in the display.
- Readings are held.
4. Read the measurement values.
5. To switch to the measuring mode: Briefly press [Hold]
• Measurement in hot oil min. 40 °C, max. 200 °C.
• Adhere to min. and max. marking when immersing in
oil.
• "Temperature striations" in the oil may cause
measurement errors. Move instrument in the deep fat
fryer.
• Cleaning of the sensor is recommended before every
measurement or when changing from one deep fat fryer
pan to the next, see Cleaning the sensor, page 26.
• Switch off induction deep fat fryers during the
measurement or take a cooking oil sample, as the
electromagnetic field can lead to incorrect readings.
• Change cooking oil as from approx. 24% TPM. A
different limit value applies in some countries. If the
measured values are above the country-specific limit
value, the cooking oil should be changed!
depth!
to 200 °C): Auto flashes, along with the reading and the alarm
indicator (display colour).
alarm indicator activated, the display colour lights up.
1 sec).
depth!
to 200 °C): Wait for the end of the equalization period (approx.
30 secs).
longer changes.
(< 1 sec).
24
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6.3. Function test
For a simple function test without adjustment (accuracy
+/- 3 % TPM
commissioning of your new instrument in unused deep-frying oil at
150 to 180 °C.
We recommend performing the function test every time after
refilling the deep fryer with fresh oil.
1. Perform measurement in unused deep-frying oil at 150 to
180 °C, see Carrying out measurements, page 23.
2. Note reading.
3. Repeat steps 1 and 2 several times.
- The average of the readings is your specific reference value for
subsequent instrument testing.
Your specific reference value:
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___________________________
3
), we recommend a measurement during the
When changing the type of oil or the oil supplier, the
reference value must be determined anew.
With implausible readings, we recommend the calibration or
adjustment in the testo reference oil, see
Calibrating/adjusting the instrument, page 28.
6 Using the product
3
typical, referred to testo internal reference, at an ambient temperature of 25 °C
25
Page 26
7 Maintaining the product
WARNING
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7 Maintaining the product
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7.1. Changing batteries
CAUTION
Incorrectly inserted batteries can damage the instrument!
> Adhere to the polarity when inserting the batteries.
Requirement: The instrument is switched off.
1. Undo the screw on the battery compartment cover and open the
battery compartment.
2. Remove the empty batteries from the holder and insert new
batteries (type AAA).
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7.2. Cleaning the sensor
3. Close battery compartment and secure with screw.
Risk of burns due to hot instrument parts (sensor and probe
shaft)!
> Do not touch hot instrument parts with your hands.
> Allow instrument to cool sufficiently before cleaning.
> In the event of burns, immediately cool corresponding spot with
cold water and see a doctor if necessary.
26
CAUTION
Possible damage to the sensor!
> Do not remove cold oil residues from the sensor.
> Do not use any sharp-edged objects.
> Do not use aggressive cleaning agents and solvents.
> Use weak household cleaning agents, standard household
rinsing agents, water or soap suds.
> Gently clean sensor with a soft paper towel, or rinse under
running water.
> Carefully dry sensor with a soft paper towel.
Page 27
With cold oil residues on the sensor
1. Immerse sensor in hot oil.
2. Allow sensor and probe shaft to cool until there is no longer a
risk of burns.
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3. Clean sensor before the oil residues cool down.
7.3. Cleaning the housing
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Requirement: The instrument is switched off.
CAUTION
Possible damage to housing!
> Do not use sharp-edged objects.
> Do not use any aggressive cleaning agents or solvents.
> Use mild household cleaning agents, standard household
washing-up liquids, water or soap suds.
> Clean housing with a damp cloth.
> Dry housing.
7 Maintaining the product
7.4. Cleaning the plastic case
CAUTION
Possible damage on and in the plastic case!
> Do not use sharp-edged objects.
> Do not use any aggressive cleaning agents or solvents.
> Use mild household cleaning agents, standard household
washing-up liquids, water or soap suds.
> Clean plastic case with a damp cloth.
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27
> Wipe plastic case with a dry cloth.
Page 28
7 Maintaining the product
7.5. Calibrating/adjusting the instrument
You can check the accuracy of your instrument by carrying out a
comparative measurement with the Testo reference oil (calibrating).
If there is too great a difference between the reading and the
reference value, future instrument readings can be adjusted to the
reference value (adjusting).
• The testo 270 should be checked with the Testo
reference oil on a regular basis and adjusted if
necessary (accuracy +/- 2.5% TPM)
4
). We recommend
a monthly check as part of quality assurance.
• We recommend you always use the Testo reference oil
for calibration/adjustment of the sensor (order no.
0554 2650, 1 piece).
• The sensor is exposed to large temperature jumps and
pollutants while in measuring mode. We therefore
recommend having an annual test carried out by Testo
Customer Service. For more information go to:
www.testo.com.
For measurements as part of a quality-assurance concept
(e.g. ISO 9001), we recommend the annual renewal of
a calibration certificate (accuracy +/- 2% TPM
more information go to: www.testo.com
Prepare calibration / adjustment
1. Clean sensor before the calibration/adjustment, see Cleaning
the sensor, page 26.
When heating the reference oil, make sure that no water
gets into the reference oil or onto the sensor.
The reference oil must be heated to approx. 50 °C for
calibration and adjustment.
4
). For
4
typically, based on Testo in-house reference, at an ambient temperature of
25 °C.
28
Page 29
7 Maintaining the product
2. Heat water in a container (e.g. a cup) to approx. 50 °C. Place
closed reference oil bottle in the water bath for approx. 10 min
(maximum water level to lower edge of sealing cap). Then
briefly shake the closed reference oil bottle, for better heat
distribution in the bottle.
Carry out calibration / adjustment
1. Switch the instrument on, press and hold down [Hold] during
the display test for approx. 2 secs.
- When the PIN is deactivated, Alarm lights up in the
display.
> when the PIN is activated: Enter PIN.
2. Go through the configuration mode with [Hold], until CAL and
yes or no light up in the display.
3. Switch on the calibration/adjustment function with [ ] or [ ]
(yes).
4. Confirm with [Hold].
- OIL and CAL light up in the display.
There is a negative effect on the accuracy of the
calibration/adjustment when the reference oil bottle is held
by hand.
29
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7 Maintaining the product
5. Immerse sensor in reference oil. Adhere to the immersion
depth!
- When alarm indicator is activated: the display lights up orange.
6. Start calibration/adjustment process with [Hold]. For faster
recording of readings: move sensor in oil.
- The display lights up red.
- Measured TPM value and temperature are displayed.
- With a stable reading: Control keys are enabled, display lights
up green.
7. Compare the value shown in the display with the target value
indicated on the label of the reference oil bottle.
> If there is a deviation of > 1%, adjustment should be carried
> If there is a deviation of </= 1%, no adjustment is required.
8. With [ ] or [ ] set the TPM value to the value that is indicated
on the label of the reference oil bottle.
9. Save with [Hold] and carry out further settings in the
configuration mode. Use [ ] to quit the configuration mode.
out. Continue with step 8.
Continue with step 9.
Adjustment with reference oil impairs the accuracy by
0.5% TPM compared to the factory calibration.
A maximum correction of +/-3% TPM is possible. If the
TPM value displayed deviates by more than 3% TPM from
the target value of the reference oil, a technical check of
the instrument by Testo Service is recommended.
30
Page 31
Carry out reset (delete adjustment and reset to factory setting)
1. Switch the instrument on, press and hold down [Hold] during
the display test for approx. 2 secs.
- When the PIN is deactivated, Alarm lights up in the
display.
2. Go through the configuration mode with [Hold], until rst and
yes or no light up in the display.
3. Select yes (=delete adjustment value and reset to factory
setting) or no (=no resetting of the adjustment value) with [ ]
or [ ].
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4. Confirm with [Hold].
7 Maintaining the product
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8 Tips and assistance
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8 Tips and assistance
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8.1. Questions and answers
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Items shown on the
Possible causes / solution
display:
lights up and flashing
temperature value <40 °C
appears in the display
lights up and flashing
temperature value >
200 °C appears in the
Permissible measuring range
undershot
> Increase oil temperature.
Permissible measuring range
exceeded
> Reduce oil temperature.
display
Battery symbol lights
up
Battery charge level low (approx. 7 hrs
remaining life)
> Change batteries if necessary, see
Changing batteries, page 26
Battery symbol flashes
Batteries empty
(approx. 30 min remaining life)
> Change batteries, see Changing
batteries, page 26
000 lights up
Sensor not in oil
> Instrument is ready for
measurement. Immerse sensor in
oil.
PIN lights up
Configuration mode locked.
> Unlock configuration mode. see
Locking / unlocking configurations,
page 20
Err 1 lights up
TPM sensor faulty
> Contact Testo Customer Service
or your dealer.
Err 2 lights up
Temperature sensor faulty
> Contact Testo Customer Service
or your dealer.
Err 3 lights up TPM sensor and temperature sensor
faulty
> Contact Testo Customer Service
or your dealer.
32
Page 33
8 Tips and assistance
Items shown on the
Possible causes / solution
display:
Err 4 lights up
Other fault
> Contact Testo Customer Service
or your dealer.
ser lights up When entering the adjustment value, a
TPM value discrepancy of more than
10% TPM. occurs.
> We recommend a technical check
of the instrument by Testo
Customer Service.
If we have not been able to answer your question: please contact
your local dealer or the Testo Customer Service. For contact
details, see the back of this document or visit the website
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8.2. Accessories and spare parts
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www.testo.com/service-contact.
Description Item no.
testo 270 In the plastic case, Testo
reference oil
Plastic case for testo 270 (spare part) 0516 7301
ISO calibration certificate for testo 270,
calibration points 3% and 24% TPM 0520 0028
Testo reference oil (1 x) 0554 2650
For further accessories and spare parts, please refer to the product
catalogues and brochures or look up on the Internet at
=== Ende der Liste für Textmarke Inhalt ===
www.testo.com
0563 2750
33
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0970 2750 en 02 V01.00
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