Oil level sensors
Discover the possibilities
What can you expect?
This is the “oil level sensors” section of the overall “Hella sensors
and actuators” catalogue. The sensors can be used for a wide
range of applications from the acquisition of the minimum oil level
to the continual measurement of the oil level. You know yourself
how broad and varied the range of applications for these parts is
– both for specific areas and products. With this summary we
would like to give you the opportunity to discover how you can
use Hella quality in your area of responsibility. This can certainly
be worth your while, because the overall quality of a product
always depends on the quality of its individual part.
Use our customer support
Contact us by phone or e-mail and we can discuss all the
detailed technical aspects with you. Naturally, we can support
you in your choice of components and its electrical integration.
We can send you sample sensors and actuators on request.
About the contents
This brochure contains the key technical data required to
evaluate a sensor, its application use and integration in an overall
system. The summary at the bottom of this page and on the right
show you examples of areas where Hella oil level sensors and
actuators can be used. These are only suggestions, of course.
Phone + 49 29 41 38-3 11 74
Fax + 49 29 41 38-4 73 11 74
www.hella.com/electric-electronics-components
E-Mail: electric-electronics-components@hella.com
What we still have to tell you
We are sure you understand that Hella cannot accept liability for
the function of the systems Hella sensors and actuators are used
in. Our liability only covers the components described and their
product characteristics.
About Hella oil level sensors and actuators
They are manufactured in large-scale production in high Original
Equipment Manufacturer quality for the automotive industry. The
range of uses covers passenger cars, trucks and special vehicles
such as tractors, construction machinery, fork lift trucks, mobile
homes and buses. Their universality makes them suitable for a
wide range of industrial applications as well, of course – e.g. in
automation, mechanical engineering, environmental engineering
and the field of heating/ sanitary equipment.
Overview of variants
Level sensors
Examples in vehicles
Examples for possible applications in the industrial field
Recording or measuring
levels.
Monitoring the level in windscreen washer
fluid tanks (washer fluid supply switches).
Monitoring or measurement of the level of
motor oil in the engine (oil level switch or oil
level sensors).
Monitoring or measurement of the level (water or oil) in supply tanks,
oil tanks, wind power plants, block heat and power plants, stationary
motors etc.
Subject to technical and factual modifications. Hella does not accept any liability for the function
of your overall system, only for the components described and their product features.
2 I Hella
Application overview
Solutions for Special OE Engine Manufactures
Further Solutions
NTC temperature sensors
Measurement of liquid and air temperature
For universal use for measuring the temperature
of liquids
Suitable for media such as oils, coolants and fuels
Angle position sensor
Accelerator sensor angle measurement
Individual or passive sensors
Measuring range -40 °C to +155 °C
High precision thanks to
internal 14 bit resolution
New sensor variant for charge air temperature
measurement with a reaction time of ≤ 15 sec
Insensitive to magnetic fields
Universal pressure sensors
Pressure measurement for oil and fuel
Pressure measurement
from 0 to 10 bar
Can be used with a broad range
of different liquids and gases
Two thread sizes: M14 and M18
Ultrasonic oil level and temperature sensor
For continual oil level and temperature measurement
Continual measurement of the level of motor
oil in the static and dynamic range.
Compact sensor architecture with a multi-chip module
High thermal stability and linearity
Accelerator pedal
Upright and pendant
Contact-less measuring system
Slim and sturdy design
Simple mechanical connection
Passive output signal
High measuring accuracy and
resistance to interference
Oil level sensor
Acquisition of oil level
Compact sensor design
Installed in the oil pan
Simple electrical connection
Integrated temperature sensor
Immediate measurement after switch-on
Hella I 3
Sensors
Level sensors
Acquisition of fluid levels (static or dynamic)
Product features
Compact sensor
Installed in the oil pan
Simple electrical connection
Principally used for motor oil
Application in further media possible
Use
This level switch is used to monitor levels. Its main field of
application is the monitoring of the level of motor oil and thus
ensuring there is a minimum filling level in the static range (engine
at a standstill) or dynamic range (engine in operation) in various
vehicle motors including tractors, fork lift trucks, construction
machinery, special vehicles etc.. In addition, the straightforward
application allows the sensor to be used in industrial applications
to guarantee minimum levels are never exceeded.
4 I Hella
Structure and function
The oil level switch is made up of a Reed contact and a float
which is actuated by its buoyancy behaviour depending on the
level of fluid. When the Reed switch is opened, this indicates that
the level has fallen below the fixed switching point of the oil level
switch. Since the oil level switch is closed above the minimum
level, this can be used to diagnose a faulty function. The oil level
switch signal is evaluated via a customer-specific evaluation
algorithm which is stored in the vehicle control unit/controller. The
minimum warning is triggered by a defined switch-off length of
the signal within the evaluation algorithm.
This sensor variant can be installed on the bottom of the oil pan.
The oil level switch is usually situated on a ledge in the oil pan or
on an additional holder, so that the minimum level of the
application can be adapted to that of the oil level switch.
Principle sketch (oil pan installation)
Tank
(e. g. Oil pan)
Connector
Switching point
Static or dynamic
minimum level
Overview of variants
Installation
Two-way connector
Material
Part number
Interior, with 190 mm cable
(e.g. on bottom of oil pan)
Interior, with 275 mm cable
(e.g. on bottom of oil pan)
Delphi ZFW2-141 or Bosch
ZFW2-83
Delphi ZFW2-141 or Bosch
ZFW2-83
PA6, 6T Ultramid TKR 4350,
black (housing)
PA6, 6T Ultramid TKR 4350,
black (housing)
6PR 232 000-001
Technical data on page
6
6PR 232 000-011
8
Hella I 5
Sensors
Level sensors
Acquisition of fluid levels (static or dynamic)
Part number 6PR 232 000-001
Technical data
Switchpoint
Max. slant of the
oil level switch
Supply voltage
Switching current
Technical data
29 ± 1 mm
≤ 8°
5 V ± 5 % or 14.5 V ± 5 %
min. 5 mA/typ. 12 mA/max. 20 mA
Pin 1
Signal
Pin 2
Ground
Voltage drop
max. 2 mV
Vibration resistance (carried out in succession)
Sinus-shaped (in accordance with IEC 60068-2-6)
greatest offset at 100 Hz: 0.177 mm,
200 Hz: 280 m/s2, 220 Hz: 280 m/s2, 240 Hz: 160 m/s2,
320 Hz: 160 m/s2, 340 Hz: 125 m/s2, 440 Hz: 125 m/s2
Broadband noise (in accordance with IEC 60068-2-64)
Eff. total acceleration = 170 m/s2
10 Hz: 10 (m/s2)2/Hz, 100 Hz: 10 (m/s2)2/Hz,
300 Hz: 0.51 (m/s2)2/Hz, 500 Hz: 45.6 (m/s2)2/Hz,
1500 Hz: 15.26 (m/s2)2/Hz
Magnetic properties must be checked for every application.
1)
Insulation resistance
Dielectric strength
up to 500 Veff.
Permanent operating temperature
> 1 MΩ at 500 V DC voltage for 60 sec.
With AC voltage (50 Hz) and 2 sec.
-40 °C to +150 °C
Qualified oils
Standard motor oils (e. g. Shell Helix Ultra 5W30)
Resistant to
Exhaust gases, dust, diesel fuels in accordance with DIN
EN 590, rapeseed oil (E DIN 51606), lead-free fuels (DIN
EN 339), brake fluid DOT4, hydraulic oil Pentosin CHF
11S
Service life
Storage temperature
Operating pressure
Protective rating of the connector
seal
to the oil pan
Weight
Cable length
Cable cross-section
Cable insulation material
Individual wire
Connector housing material
Original connector material
Oil level switch housing material
Base plate material
oil level switch
50,000 switching cycles
-40 °C to +70 °C
-5 kPa to 0 kPa
IP 69K
≤ 60 g
190 + 15 mm
2 x 0.8 mm
Polyester Betax-HX FL 33 x 33 x 109
tin-plated, oil-resistant
PA66 Zytel 70G35 HSLX black BK 357
ACM or AEM, black, Shore hardness 70 ± 5
PA6, 6T Ultramid TKR 4350, black
PA66 Zytel 70G35 HSLX, black, BK 357
Bushing material
CuZn 39Pb3 R430 EN12164
Contact material
Bd EN 1652 O. 6 CuNi10Fe1Mn
Float material
PA6 Ultramid B3S, natural coloured
Reed contact
Contact wire alloy 52 F52 %Ni48 %, Ri = 100 m Ω max.
Magnet material
Air-tightness of connector
Hard ferrite 24/23, M = 10.33 ± 0.9 x 10 -6 Vscm
up to 50 ± 5 kPa oil pressure
Connector
Bosch compact connector 1928 497 999 E
Pin coating
galv. silver-coated 2701 according to Hella Norm 471026
(layer thickness according to DIN 50987 min 3 μm Ag)
Two-way connector1)
6 I Hella
Delphi ZFW2-141 or Bosch ZFW2-83
These accessories are not inclued as part of the sensor. To be purchased from Bosch/Delphi.
Technical drawing
50
Ø34
Ø7
40.6
29
Switchpoint
6.5
15
Ø 4.5
37
True length 190 +15
Mounting point for switch
1.7 ± 0.1
Mounting Hole for Plughousing
10
min. 15
M6
14
3
0.
12.1 ± 0.1
º±
30
Ø24 + 0.05
0º
7
Area sets free for
mounting of the plug
Ø50
50 ± 0.2
Mounting point for switch
Hella I 7
Sensors
Level sensors
Acquisition of fluid levels (static or dynamic)
Part number 6PR 232 000-011
Technical data
Switchpoint
Max. slant of the
oil level switch
Supply voltage
Switching current
Technical data
29 ± 1 mm
≤ 8°
5 V ± 5 % or 14.5 V ± 5 %
min. 5 mA/typ. 12 mA/max. 20 mA
Pin 1
Signal
Pin 2
Ground
Voltage drop
Insulation resistance
Dielectric strength
up to 500 Veff.
Permanent operating temperature
max. 2 mV
> 1 MΩ at 500 V DC voltage for 60 sec.
With AC voltage (50 Hz) and 2 sec.
-40 °C to +150 °C
Qualified oils
Standard motor oils (e. g. Shell Helix Ultra 5W30)
Resistant to
Exhaust gases, dust, diesel fuels in accordance with DIN
EN 590, rapeseed oil (E DIN 51606), lead-free fuels (DIN
EN 339), brake fluid DOT4, hydraulic oil Pentosin CHF
11S
Service life
Storage temperature
Operating pressure
Protective rating of the connector
seal
to the oil pan
Weight
Cable length
Cable cross-section
Cable insulation material
Individual wire
Connector housing material
Original connector material
Oil level switch housing material
Base plate material
oil level switch
50,000 switching cycles
-40 °C to +70 °C
-5 kPa to 0 kPa
IP 69K
≤ 60 g
275 + 15 mm
2 x 0.8 mm
Polyester Betax-HX FL 33 x 33 x 109
tin-plated, oil-resistant
PA66 Zytel 70G35 HSLX black BK 357
ACM or AEM, black, Shore hardness 70 ± 5
PA6, 6T Ultramid TKR 4350, black
PA66 Zytel 70G35 HSLX, black, BK 357
Bushing material
CuZn 39Pb3 R430 EN12164
Contact material
Bd EN 1652 O. 6 CuNi10Fe1Mn
Float material
PA6 Ultramid B3S, natural coloured
Reed contact
Contact wire alloy 52 F52 %Ni48 %, Ri = 100 m Ω max.
Magnet material
Air-tightness of connector
Plug
Pin coating
Two-way connector1)
8 I Hella
Hard ferrite 24/23, M = 10.33 ± 0.9 x 10 -6 Vscm
up to 50 ± 5 kPa oil pressure
Bosch compact connector 1928 497 999 E
galv. silver-coated 2701 according to Hella Norm 471026
(layer thickness according to DIN 50987 min 3 μm Ag)
Delphi ZFW2-141 or Bosch ZFW2-83
Vibration resistance (carried out in succession)
Sinus-shaped (in accordance with IEC 60068-2-6)
greatest offset at 100 Hz: 0.177 mm,
200 Hz: 280 m/s2, 220 Hz: 280 m/s2, 240 Hz: 160 m/s2,
320 Hz: 160 m/s2, 340 Hz: 125 m/s2, 440 Hz: 125 m/s2
Broadband noise (in accordance with IEC 60068-2-64)
Eff. total acceleration = 170 m/s2
10 Hz: 10 (m/s2)2/Hz, 100 Hz: 10 (m/s2)2/Hz,
300 Hz: 0.51 (m/s2)2/Hz, 500 Hz: 45.6 (m/s2)2/Hz,
1500 Hz: 15.26 (m/s2)2/Hz
Magnetic properties must be checked for every application.
1)
These accessories are not supplied as part of the sensor. To be purchased from Bosch/
Delphi.
Dimensions
50
Ø34
Ø7
40.6
29
Switchpoint
6.5
15
Ø 4.5
37
True length 190 +15
Mounting point for switch
1.7 ± 0.1
Mounting Hole for Plughousing
10
min. 15
M6
14
3
0.
12.1 ± 0.1
º±
30
Ø24 + 0.05
0º
7
Area sets free for
mounting of the plug
Ø50
50 ± 0.2
Mounting point for switch
Hella I 9
Sensors
Level sensors
Measurement of fluid levels (static and dynamic)
Product features
Continual measurement of the level of motor
oil in the static and dynamic range
Compact sensor architecture with a multi-chip module
Integrated temperature sensor
Immediate measurement after switch-on
Use
In vehicles, oil sensors ensure that the engine cannot work
unnoticed with too little oil. The tried-and-trusted technology of
the ultrasonic sensors works on the delay time principle and
records the filling level continuously during the trip. During engine
operation (dynamic measuring range) the filling level is
significantly lower than when the engine is at a standstill (static
measuring range). A dipstick only records the oil level of mobile
engines in the static range. This oil level sensor can measure the
oil level continuously, i.e. both in the dynamic and in the static
range. It thus provides information about the oil level within the
whole period of engine operation, which can often be several
hours in the case of construction machinery, tractors and fork lift
trucks. The sensor monitors the oil level continuously during the
entire engine operation, which means the oil level can be
prevented from falling below the minimum level during operation,
which in turn means the oil film is not interrupted (which would
lead to engine damage). Secondary influences such as the slope
of the vehicle, lateral and longitudinal accelerations, are
compensated by the vehicle control unit calculating a mean
value.
Structure and function
The sensor architecture of the oil level sensor PULS (Packed
Ultrasonic Level Sensor) comprises one single multi-chip module
which integrates the ultrasonic and temperature sensor as well as
an ASIC (Application Specific Integrated Circuit). The
compactness of our sensors increases their impact and vibration
resistance compared with sensors that are fitted with numerous
electronic components. The ultrasonic sensor integrated in the
multi-chip module transmits a signal that is reflected by the
bounding surface between the motor oil and the air.
The signal’s running time is measured and the filling level is
calculated depending on the speed of sound in the medium. The
attenuation cup attached above the multi-chip module serves to
calm the medium (particularly) in the dynamic measuring range.
The attenuation cup has openings on the base and at the tip
which allow permanent oil flow.
Principle sketch of the 12 V version
Static measurement range
129 mm
Example of static oil minimum
Transition zone
Dynamic measurement range
96 mm
Damping cup
Example of dynamic oil minimum
Principle sketch of the 5 V version
Transition zone
Static or dynamic
measurement range 45 mm
Damping cup
Example of static or dynamic oil minimum
10 I Hella
Installation
The sensor has been designed for vertical installation from below,
directly into the bottom of an oil pan. The oil level sensor is usually
located on a ledge in the oil pan to protect the sensor base. This
installation location in connection with the ventilation opening in
the cap make a permanent oil flow possible, preventing sludge
accumulation within the attenuation cup.
Block circuit diagram
15
A
Control unit /
5V/12V
pull up (e.g. 3.9/10k Omh)
15
Temperature
A
A
31
31
Oil Level
Analysis
Overview of variants
Installation
Supply voltage
Measuring range
Part number
From below
12 V
6PR 009 622-051
12
From below
5V
static 129 mm,
dynamic 96 mm
static or dynamic
45 mm
Technical data on page
6PR 009 622-041
15
Hella I 11
Sensors
Level sensors
Measurement of fluid levels (static and dynamic)
Part number 6PR 009 622-051
Technical data
Measuring range (static)
Measuring range (dynamic)
Mechanical offset
Accuracy (absolute)1)
Accuracy in the transition area2) of the
attenuation cup
Reaction time for level measurement
Maximum slope of the sensor
(installation)
Sensor slope
(operation, static)
(operation, dynamic)
Qualified oils
Nominal voltage
Voltage range
Temperature measuring range
Technical data
129 mm
96 mm
18 mm
± 3 mm
-2 to +4 mm
< 1 ms
4° in all directions
Maximum operating pressure: Sensor only contains electronic components and no glass
components such as Reed contact. The typical pressure in an oil pan is around 0.5 bar. The
functional ability of the sensor is independent of the ambient pressure. The sensor seal is the
same as with a pressure sensor. For this reason, theoretical ambient pressures of up to 40 bar
are possible.
Housing material
Polyamide 66, 36 % fibreglass
Sealing ring
AEM 70 ± 5 Shore A (ethylene acrylate rubber)
Pin material
CuNi10
Pin coating
Silver
Two-way connector4)
min. 10°
min. 20°
Standard motor oils (e.g. Castrol 10W30)
Protective rating (connector)
IP 69K
Service life
15 years or 300,000 km
1)
In the temperature range from 0 °C to 150 °C, ± 2 mm accuracy
at ≤ 100 mm and 30 °C to 120 °C
2)
In the temperature range from 30 °C to 150 °C
3)
± 3K in the temperature range – 40 °C to 60 °C and 120 °C to 160 °C
12 V
9 V to 16 V
Kostal no. 09 44 13 82
-40 °C to +160 °C
4)
Output
±2K
< 1 ms
PWM (open collector, lowside)
Signal output voltage (high)
(low)
corresp. to voltage range
max. 1 V
Signal output current (high)
(low, max.)
(low, ref.)
20 μA
10 mA
2 mA
Load (pull-up resistor)
1.6–10 kΩ
Current consumption
6 mA (typical)
Current consumption (peak)
(pulse generation)
Output voltage
max. 50 mA
-40 °C to +150 °C
Storage temperature
-40 °C to +140 °C
Temperature resistance
(IEC 60068-2-2)
Resistant to
Vibration resistance (IEC 60068-2-6)
Direction
Duration
Temperature range
Test environment
Speed of temperature change
No measurement during the test
Shock resistance (IEC 60068-2-27)
Acceleration
Duration
Number of cycles
Test environment
12 I Hella
Ø 130°
5 V... UB
Operating temperature
EMC
Technical drawing
Ø 10
°
Accuracy (between 60 °C and 120 °C)3)
Reaction time for temperature
measurement
These accessories are not supplied as part of the sensor. To be purchased from Kostal.
on request
750 h at 150 °C
3x Ø 6.6
Brake fluid, petrol, salt, battery filling agent
in three directions (X, Y, Z)
t = 216 hours, 72 hours per direction
-40 °C to +140 °C
Oil (Castrol SLX R-tec); level ~ 21 mm
1K/min (25 cycles per direction)
10–50 Hz -> 1 g
50–250 Hz -> 15 g
250–2500 Hz -> 35 g
± 100 g
10 ms
6/axis
20 °C air
No measurement during the test
Ø 60
VENTILATION OPENING
Ø 110°
STATIC
MEASUREMENT RANGE 129 mm
147 mm
DYNAMIC
MEASUREMENT RANGE 96 mm
GASKET MUST BE ONLY USED
ONCE IN PRESSED CONDITION
Mechanical offset 18 mm
Ø 40
PWM (open collector) signal evaluation
T1 Temperature
T2 Level
TTemp.
TLevel
920ms
80%
20%
T1
T3
22ms
22ms
10ms
T3
68,2ms
20%
T=110ms
1141,8ms
80%
T=110ms
T=1210ms
Startup/
Checksum
TSignal =1000ms
Repetition
Start
Technical drawing
16.25
12.25
Pin 1 terminal 15 VBatt
Pin 2 terminal 31 GND
Pin 3 OUTPUT
126.1
17
Ø 40.5
M6
Rz 25
22
SEALING AREA FREE OFF BURR
MAX. ACCEPTED CIRC. RADII R0. 3mm
OPTIONALLY CHAMFER CIRC. 0.3 mm X 45°
Hella I 13
Sensors
Level sensors
Measurement of fluid levels (static and dynamic)
Temperature evaluation (T1 Temp)
20 % of the PWM blocking period T1 (22 ms)
corresponds to the lowest measuring point of the
measuring range of -40 °C
80 % of the PWM blocking period T1 (88 ms)
corresponds to the highest point of the
measuring range of 160 °C
DC
T1(TTemp)
80%
› 88ms
Temperature Duty Cycle (DC1)
20%
› 22ms
-40ºC
+160ºC
Temperature Duty Cycle (D1)
Oil filling level evaluation (T2 level)
20 % of the PWM blocking period T2 (22 ms)
corresponds to the lowest measuring point of the
measuring range of 18 mm
80 % of the PWM blocking period T2 (88 ms)
corresponds to the highest point of the
measuring range of 147 mm
Level Duty Cycle (DC2)
DC
T2(Tlevel)
80%
› 88ms
20%
› 22ms
18.0mm
147mm
Level Duty Cycle (D2)
Basic information about the signal duration
Star check sum = 920 ms
PWM blocking period T = 110 ms
PWM blocking period T3 = 68,2 ms (fixed)
Total PWM blocking period TSignal = 1000 ms
Pause signal 670 ms
Tolerance of all time signals (from PWM cycle) ± 10 %
All the calculation data only apply for standard motor oil on
account of the dependence between ultrasonic speed and
density of the medium.
Consequently, the above calculation only works for standard
motor oils (e.g. Castrol 10W30). In the case of other measurable
non-conductive media, the calculation must be checked in the
respective application.
14 I Hella
Temp (°C) =
(T1/T - 0.32)
0.003
Level (mm) = [(T2/T-0.2) x 215 + 12.66] x
Calculation in the control unit
T
110
+ 5.34
Sensors
Level sensors
Measurement of fluid levels (static and dynamic)
Part number 6PR 009 622-041
Technical data
Technical data
Measuring range (static/dynamic)
45 mm
Mechanical offset
20.9 mm
Accuracy (absolute)1)
± 3 mm
Accuracy in the transition area2)
of the attenuation cup
-2 to +4 mm
Reaction time for level measurement
< 1 ms
Maximum slope of the sensor
(installation)
4° in all directions
min. 10°
in. 20°
Standard motor oils (e. g. Castrol 10W30)
5V
Voltage range
-40 °C to +160 °C
3)
Accuracy (between 60 °C and 120 °C)
±2K
< 1 ms
Signal output current (high)
(low, max.)
(low, ref.)
20 μA
10 mA
2 mA
Load (pull-up resistor)
1.6–10 kΩ
Current consumption
6 mA (typical)
5 V... UB
Storage temperature
-40 °C to +140 °C
Shock resistance (IEC 60068-2-27)
Acceleration
Duration
Number of cycles
Test environment
Protective rating (connector)
Service life
IP 69K
15 years or 300,000 km
1)
In the temperature range from 0 °C to 150 °C, ± 2 mm accuracy
at ≤ 100 mm and 30 °C to 120 °C
2)
In the temperature range from 30 °C to 150 °C
3)
± 3K in the temperature range – 40 °C to 60 °C and 120 °C to 160 °C
These accessories are not supplied as part of the sensor. To be purchased from Kostal.
Ø 130°
-40 °C to +150 °C
Vibration resistance (IEC 60068-2-6)
Direction
Duration
Temperature range
Test environment
Speed of temperature change
No measurement during the test
Kostal no. 09 44 13 82
max. 50 mA
Operating temperature
Resistant to
Silver
Two-way connector4)
PWM (open collector, lowside)
corresp. to Voltage range
max. 1 V
Temperature resistance
(IEC 60068-2-2)
CuNi10
4)
Signal output voltage (high)
(low)
EMC
Pin material
4.9 V to 9 V
Temperature measuring range
Output voltage
AEM 70 ± 5 Shore A (ethylene acrylate rubber)
°
Nominal voltage
Power consumption (peak)
(pulse generation)
Polyamide 66, 36 % fibreglass
Sealing ring
Ø 10
Qualified oils
Output
Housing material
Pin coating
Slope of the sensor
(operation, static)
(operation, dynamic)
Reaction time for temperature
measurement
Maximum operating pressure: Sensor only contains electronic components and no glass
components such as Reed contact. The typical pressure in an oil pan is around 0.5 bar. The
functional ability of the sensor is independent of the ambient pressure. The sensor seal is the
same as with a pressure sensor. For this reason, theoretical ambient pressures of up to 40 bar
are possible.
on request
750 h at 150 °C
3x Ø 6.6
Ø 60
Brake fluid, petrol, salt, battery filling agent
in three directions (X, Y, Z)
t = 216 hours, 72 hours per direction
-40°C to +140°C
Oil (Castrol SLX R-tec); level ~ 21 mm
1K/min (25 cycles per direction)
10–50 Hz -> 1 g
50–250 Hz -> 15 g
250–2500 Hz -> 35 g
Ø 110°
± 100 g
10 ms
6/axis
20 °C air
No measurement during the test
Hella I 15
PWM (open collector) signal evaluation
T1 Temperature
T2 Level
TTemp.
TLevel
920ms
80%
20%
T=110ms
68,2ms
20%
T=110ms
TSignal =1000ms
Technical drawing
terminal
terminal
16 I Hella
1141,8ms
80%
Startup/
Checksum
Start
T1
T3
22ms
22ms
10ms
T3
Repetition
T=1210ms
Sensors
Level sensors
Measurement of fluid levels (static and dynamic)
Temperature evaluation (T1 Temp)
20 % of the PWM blocking period T1 (22 ms)
corresponds to the lowest measuring point of the
measuring range of -40 °C
80 % of the PWM blocking period T1 (88 ms)
corresponds to the highest point of the
measuring range of 160 °C
DC
T1(TTemp)
80%
› 88ms
Temperature Duty Cycle (DC1)
20%
› 22ms
-40ºC
+160ºC
Temperature Duty Cycle (D1)
Oil filling level evaluation (T2 level)
20 % of the PWM blocking period T2 (22 ms)
corresponds to the lowest measuring point of the
measuring range of 20.9 mm
80 % of the PWM blocking period T2 (88 ms)
corresponds to the highest point of the
measuring range of 65.9 mm
Level Duty Cycle (DC2)
DC
T2(Tlevel)
80%
› 88ms
20%
› 22ms
18.0mm
147mm
Level Duty Cycle (D2)
Basic information about the signal duration
Star check sum = 920 ms
PWM blocking period T = 110 ms
PWM blocking period T3 = 68,2 ms (fixed)
Total PWM blocking period TSignal = 1000 ms
Pause signal 670 ms
Tolerance of all time signals (from PWM cycle) ± 10 %
All the calculation data only apply for standard motor oil on
account of the dependence between ultrasonic speed and density
of the medium. Consequently, the above calculation only works
for standard motor oils (e.g. Castrol 10W30). In the case of other
measurable non-conductive media, the calculation must be
checked in the respective application.
Temp (°C) =
(T1/T - 0.32)
0.003
Level (mm) = [(T2(T-0.2) x 75 + 15.56] x
T
110
+ 5.34
Calculation in the control unit
Hella I 17
Notes
18 I Hella
Notes
Hella I 19
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D-59552 Lippstadt/Germany
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Telefax + 49 29 41 38-4 73 11 74
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