SKF TMEH 1 Manuale utente
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SKF TMEH 1
English 5
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4SKF TMEH 1
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SKF TMEH 1
Table of contents
EC Declaration of conformity ...........................................................6
1. Introduction ..............................................................................7
1.1 Principle of operation.......................................................................7
2. Technical data ...................................................................................8
3. Operating instructions ..............................................................9
3.1 Calibration..........................................................................................9
3.2 Cleaning of sensor ............................................................................9
3.3 Measuring ........................................................................................10
3.4 Interpretation of the reading ........................................................10
4. Contamination effects ............................................................. 10
5. Important information ............................................................ 11
6. Maintenance ...........................................................................11
Original instructions
6SKF TMEH 1
EC Declaration of conformity
We,
SKF Maintenance Products
Kelvinbaan 16
3439 MT Nieuwegein
The Netherlands
herewith declare that the following product:
SKF Oil Check Monitor
TMEH 1
has been designed and manufactured in accordance with:
EMC DIRECTIVE 2004/108/EC as outlined in the harmonized
norm for
EN61326-1:2006
EUROPEAN ROHS DIRECTIVE 2011/65/EU
Nieuwegein, The Netherlands,
June 2013
Sébastien David
Manager Product Development and Quality
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SKF TMEH 1
1. Introduction
The SKF Oil Check Monitor TMEH 1 measures the effect of contamination
and electro-chemical changes that occur in synthetic and petroleum
based oils. It is especially developed for engine oils but is also suitable for
gear and lubrication oils. The OilCheck is a portable instrument, which
offers a two-minute alternative to lengthy laboratory investigations.
1.1 Principle of operation
The SKF TMEH 1 detects and measures the dielectric constant of an oil.
By comparing the measurements obtained from used and unused oils
of the same brand, the SKF TMEH 1 is able to determine the degree of
change in the dielectric constant of the oil. Dielectric change is directly
related to the degradation and contamination level of the oil and
helps the user to optimise intervals between oil changes and to detect
increased mechanical wear and loss of the oils lubricating properties. To
facilitate trending the instrument is equipped with a numerical read-out.
8SKF TMEH 1
2. Technical data
Suitable oil types Mineral and synthetic oils
Repeatability Better than 95 %
Read-out
Green/Red grading + Numerical display
(-999 to 999)
Read-out resolution HI: 1 LO: 0.6
Battery 9 V Alkaline, IEC 6LR61
Battery lifetime 150 hours or 3 000 tests
Dimensions (instrument) 250 x 95 x 32 mm (9.8 x 3.7 x 1.3 in)
Designation TMEH 1
A
B
C
D
E
A Sample sensor
B Cal button
C Display
D Test button
E ON/OFF, HI/LO switch
Low battery
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SKF TMEH 1
3. Operating instructions
3.1 Calibration
Before calibration it is important to
ensure the sensing cell is clean and
dry, as moisture and contamination
will adversely affect the results. Testing
should generally be undertaken with
the unit switched in the HI position.
The Green/Red scale is mainly for use
when testing engine oils.
Step 1
Half fill the sensing cell with clean oil
(ensure that the whole surface of the
sensor is well covered with oil). Oil
of the same brand as in the system
being evaluated, should be used for
calibration.
Step 2
Run the rotary switch from the OFF
position to the HI position, the display
will complete a full sweep and return
to the zero position. Press the CAL
button for a minimum of 15 seconds.
The display will show with the CAL
symbol flashing. If during testing
the CAL graphic flashes the unit will
require re-calibration.
Step 3
Press the test button. The CAL graphic
will disappear and one segment will
remain displayed. The instrument has
now calibrated itself against the clean
sample and is ready to test the oil in
your system. The calibration data will
be stored in the memory until a new
calibration procedure is performed.
Note: Ensure that the CAL knob is not pressed as this will put the
instrument back into calibration mode and the unit will need
to be re-calibrated.
3.2 Cleaning of sensor
Remove the unused sample from the sensor cell with a clean rag or
tissue. Clean the sensor by using a contact cleaner solution (penetrating,
fast-evaporating, non-residue solution), such as LoctiteTM 7070.
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3.3 Measuring
For optimum results make sure you use a representative oil sample and
that its temperature is not higher than 40 °C (100 °F). Place enough
oil in the sensor to fully cover the sensor surface. Press the test button
and keep it depressed for 10 seconds or until the segments have
stopped moving around the display (the display will flash to show the
unit is testing). The result will remain on the display when the button is
released until the next test is carried out.
To test again, clean out the sensor well with a clean rag or tissue. Refill
the sensor well and press the test button again. A new reading will
appear on the display.
In case an oil of another
brand is checked,
recalibration of the
instrument will be
needed.
(see 3.1)
3.4 Interpretation of the reading
Users should use the SKF TMEH 1 to monitor the change in the
oils properties and build up a picture of oil degradation based on
their experience and own operating criteria. Individual thresholds of
acceptability can be marked on the unit’s scale.
The red and green areas are designed as an indicator of the condition of
an engine oil. Within the green band the oil is deemed acceptable and
within the red area the oil should be changed and checked again after a
short running period to ensure no mechanical problems are present.
4. Contamination effects
The usual contamination found in oils is caused by oxidation and acid
build up, these occur during the normal running of an engine and
should show up as a gradual increase in readings over a period of time
or distance. Other contaminants occur because of excessive wear or
mechanical failure, the main elements of which are dirt, soot, fuel, water,
anti-freeze and metal particles. These elements give a marked increase
in the Oil check monitor’s reading and will give immediate warning of
possible resulting failure.
1. Water and anti-freeze contamination will cause a dramatic change
in the reading, which will move the segments well into the red.
2. Metal particles will also cause an extreme reading though the display
should move up in small jumps as the particles settle on the sensor
surface.
3. Fuel is harder to detect as its presence will sometimes mask the
presence of other contaminants. If the oil is only contaminated by
fuel the display will show it as a stronger reading well into the red
but the presence of water or metal will sometimes counteract the
fuel giving a reading in the green. Should an engine oil continue to
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