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. 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. 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. 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. 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 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 Measuring range -40 C to +155 C New sensor variant for charge air temperature measurement with a reaction time of 15 sec Angle position sensor Accelerator sensor angle measurement Individual or passive sensors High precision thanks to internal 14 bit resolution High thermal stability and linearity Insensitive to magnetic fi elds 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 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 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 Integrated temperature sensor Immediate measurement after switch-on Oil level sensor Acquisition of oil level Compact sensor design Installed in the oil pan Simple electrical connection 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. 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. 4 I Hella
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 Technical data on page 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 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 29 ± 1 mm Max. slant of the oil level switch 8 Supply voltage 5 V ± 5 % or 14.5 V ± 5 % Switching current min. 5 ma/typ. 12 ma/max. 20 ma Pin 1 Signal Pin 2 Ground Voltage drop max. 2 mv Insulation resistance > 1 MΩ at 500 V DC voltage for 60 sec. Dielectric strength up to 500 Veff. With AC voltage (50 Hz) and 2 sec. Permanent operating temperature -40 C to +150 C Qualified oils Standard motor oils (e. g. Shell Helix Ultra 5W30) Exhaust gases, dust, diesel fuels in accordance with DIN EN 590, rapeseed oil (E DIN 51606), lead-free fuels (DIN Resistant to EN 339), brake fluid DOT4, hydraulic oil Pentosin CHF 11S Service life 50,000 switching cycles Storage temperature -40 C to +70 C Operating pressure -5 kpa to 0 kpa Protective rating of the connector seal IP 69K to the oil pan Weight 60 g Cable length 190 + 15 mm Cable cross-section 2 x 0.8 mm Cable insulation material Polyester Betax-HX FL 33 x 33 x 109 Individual wire tin-plated, oil-resistant Connector housing material PA66 Zytel 70G35 HSLX black BK 357 Original connector material ACM or AEM, black, Shore hardness 70 ± 5 Oil level switch housing material PA6, 6T Ultramid TKR 4350, black Base plate material oil level switch 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 Hard ferrite 24/23, M = 10.33 ± 0.9 x 10-6 Vscm Air-tightness of connector up to 50 ± 5 kpa oil pressure Connector Bosch compact connector 1928 497 999 E Pin coating Two-way connector 1) galv. silver-coated 2701 according to Hella Norm 47102-6 (layer thickness according to DIN 50987 min 3 μm Ag) Delphi ZFW2-141 or Bosch ZFW2-83 Technical data 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/s 2, 220 Hz: 280 m/s 2, 240 Hz: 160 m/s 2, 320 Hz: 160 m/s 2, 340 Hz: 125 m/s 2, 440 Hz: 125 m/s 2 Broadband noise (in accordance with IEC 60068-2-64) Eff. total acceleration = 170 m/s 2 10 Hz: 10 (m/s 2 )2/Hz, 100 Hz: 10 (m/s 2 )2/Hz, 300 Hz: 0.51 (m/s 2 )2/Hz, 500 Hz: 45.6 (m/s 2 )2/Hz, 1500 Hz: 15.26 (m/s 2 )2/Hz Magnetic properties must be checked for every application. 1) These accessories are not inclued as part of the sensor. To be purchased from Bosch/Delphi. 6 I Hella
Technical drawing 50 Ø7 Ø34 Switchpoint 6.5 15 True length 190 +15 1.7 ± 0.1 Mounting Hole for Plughousing 100º 30º ± 0.3 Ø24 + 0.05 12.1 ± 0.1 Area sets free for mounting of the plug 7 M6 Ø50 29 40.6 Ø 4.5 37 Mounting point for switch 14 min. 15 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 29 ± 1 mm Max. slant of the oil level switch 8 Supply voltage 5 V ± 5 % or 14.5 V ± 5 % Switching current min. 5 ma/typ. 12 ma/max. 20 ma Pin 1 Signal Pin 2 Ground Voltage drop max. 2 mv Insulation resistance > 1 MΩ at 500 V DC voltage for 60 sec. Dielectric strength up to 500 Veff. With AC voltage (50 Hz) and 2 sec. Permanent operating temperature -40 C to +150 C Qualified oils Standard motor oils (e. g. Shell Helix Ultra 5W30) Exhaust gases, dust, diesel fuels in accordance with DIN EN 590, rapeseed oil (E DIN 51606), lead-free fuels (DIN Resistant to EN 339), brake fluid DOT4, hydraulic oil Pentosin CHF 11S Service life 50,000 switching cycles Storage temperature -40 C to +70 C Operating pressure -5 kpa to 0 kpa Protective rating of the connector seal IP 69K to the oil pan Weight 60 g Cable length 275 + 15 mm Cable cross-section 2 x 0.8 mm Cable insulation material Polyester Betax-HX FL 33 x 33 x 109 Individual wire tin-plated, oil-resistant Connector housing material PA66 Zytel 70G35 HSLX black BK 357 Original connector material ACM or AEM, black, Shore hardness 70 ± 5 Oil level switch housing material PA6, 6T Ultramid TKR 4350, black Base plate material oil level switch 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 Hard ferrite 24/23, M = 10.33 ± 0.9 x 10-6 Vscm Air-tightness of connector up to 50 ± 5 kpa oil pressure Plug Bosch compact connector 1928 497 999 E Pin coating Two-way connector 1) galv. silver-coated 2701 according to Hella Norm 47102-6 (layer thickness according to DIN 50987 min 3 μm Ag) Delphi ZFW2-141 or Bosch ZFW2-83 Technical data 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/s 2, 220 Hz: 280 m/s 2, 240 Hz: 160 m/s 2, 320 Hz: 160 m/s 2, 340 Hz: 125 m/s 2, 440 Hz: 125 m/s 2 Broadband noise (in accordance with IEC 60068-2-64) Eff. total acceleration = 170 m/s 2 10 Hz: 10 (m/s 2 )2/Hz, 100 Hz: 10 (m/s 2 )2/Hz, 300 Hz: 0.51 (m/s 2 )2/Hz, 500 Hz: 45.6 (m/s 2 )2/Hz, 1500 Hz: 15.26 (m/s 2 )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. 8 I Hella
Dimensions 50 Ø7 Ø34 Switchpoint 6.5 15 True length 190 +15 1.7 ± 0.1 Mounting Hole for Plughousing 100º 30º ± 0.3 Ø24 + 0.05 12.1 ± 0.1 Area sets free for mounting of the plug 7 M6 Ø50 29 40.6 Ø 4.5 37 Mounting point for switch 14 min. 15 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 Transition zone Damping cup Static measurement range 129 mm Dynamic measurement range 96 mm Principle sketch of the 5 V version Example of static oil minimum Example of dynamic oil minimum Transition zone Damping cup Static or dynamic measurement range 45 mm 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 A 15 Control unit / 5V/12V pull up (e.g. 3.9/10k Omh) Temperature Oil Level 15 A 31 A 31 Analysis Overview of variants Installation Supply voltage Measuring range Part number Technical data on page From below 12 V static 129 mm, 6PR 009 622-051 12 dynamic 96 mm From below 5 V static or dynamic 45 mm 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) 129 mm Measuring range (dynamic) 96 mm Mechanical offset 18 mm Accuracy (absolute) 1) ± 3 mm Accuracy in the transition area 2) 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 Sensor slope (operation, static) (operation, dynamic) min. 10 min. 20 Qualified oils Standard motor oils (e.g. Castrol 10W30) Nominal voltage 12 V Voltage range 9 V to 16 V Temperature measuring range -40 C to +160 C Accuracy (between 60 C and 120 C) 3) ± 2 K Reaction time for temperature measurement < 1 ms Output PWM (open collector, lowside) Signal output voltage (high) (low) Signal output current (high) (low, max.) (low, ref.) Load (pull-up resistor) Current consumption Current consumption (peak) (pulse generation) Output voltage corresp. to voltage range max. 1 V 20 μa 10 ma 2 ma 1.6 10 kω 6 ma (typical) max. 50 ma 5 V... UB Operating temperature -40 C to +150 C Storage temperature -40 C to +140 C EMC on request 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 750 h at 150 C 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 Technical data 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 connector 4) Kostal no. 09 44 13 82 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 4) These accessories are not supplied as part of the sensor. To be purchased from Kostal. Technical drawing Ø 130 Ø 10 3x Ø 6.6 Ø 110 Ø 60 GASKET MUST BE ONLY USED ONCE IN PRESSED CONDITION VENTILATION OPENING STATIC MEASUREMENT RANGE 129 mm DYNAMIC MEASUREMENT RANGE 96 mm Mechanical offset 18 mm 147 mm 12 I Hella Ø 40
PWM (open collector) signal evaluation T 1 Temperature T 2 Level T 3 T 1 T Temp. T Level T 3 22ms 22ms 68,2ms 1141,8ms 10ms 920ms Startup/ Checksum 20% 80% T=110ms 20% 80% T=110ms TSignal =1000ms T=1210ms Start Repetition Technical drawing 16.25 12.25 Pin 1 terminal 15 V Batt Pin 2 terminal 31 GND Pin 3 OUTPUT 126.1 Ø 40.5 17 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 (T 1 Temp) 20 % of the PWM blocking period T 1 (22 ms) corresponds to the lowest measuring point of the measuring range of -40 C 80 % of the PWM blocking period T 1 (88 ms) corresponds to the highest point of the measuring range of 160 C DC T 1(T Temp) 80% 88ms 20% 22ms Temperature Duty Cycle (DC 1) -40ºC +160ºC Temperature Duty Cycle (D1) Oil filling level evaluation (T 2 level) 20 % of the PWM blocking period T 2 (22 ms) corresponds to the lowest measuring point of the measuring range of 18 mm 80 % of the PWM blocking period T 2 (88 ms) corresponds to the highest point of the measuring range of 147 mm DC T 2(Tlevel) 80% 88ms 20% 22ms Level Duty Cycle (DC 2) 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 T 3 = 68,2 ms (fixed) Total PWM blocking period T Signal = 1000 ms Pause signal 670 ms Tolerance of all time signals (from PWM cycle) ± 10 % Temp ( C) = (T 1/T - 0.32) 0.003 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. T Level (mm) = [(T 2 /T-0.2) x 215 + 12.66] x + 5.34 110 Calculation in the control unit 14 I Hella
Sensors Level sensors Measurement of fluid levels (static and dynamic) Part number 6PR 009 622-041 Technical data Measuring range (static/dynamic) 45 mm Mechanical offset 20.9 mm Accuracy (absolute) 1) ± 3 mm Accuracy in the transition area 2) 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 Slope of the sensor (operation, static) (operation, dynamic) min. 10 in. 20 Qualified oils Standard motor oils (e. g. Castrol 10W30) Nominal voltage 5 V Voltage range 4.9 V to 9 V Temperature measuring range -40 C to +160 C Accuracy (between 60 C and 120 C) 3) ± 2 K Reaction time for temperature measurement < 1 ms Output PWM (open collector, lowside) Signal output voltage (high) (low) Signal output current (high) (low, max.) (low, ref.) Load (pull-up resistor) Current consumption Power consumption (peak) (pulse generation) Output voltage corresp. to Voltage range max. 1 V 20 μa 10 ma 2 ma 1.6 10 kω 6 ma (typical) max. 50 ma 5 V... UB Operating temperature -40 C to +150 C Storage temperature -40 C to +140 C EMC on request 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 750 h at 150 C 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 Technical data 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 connector 4) Kostal no. 09 44 13 82 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 4) These accessories are not supplied as part of the sensor. To be purchased from Kostal. Ø 130 Ø 10 3x Ø 6.6 Ø 110 Ø 60 Hella I 15
PWM (open collector) signal evaluation T 1 Temperature T 2 Level T 3 T 1 T Temp. T Level T 3 22ms 22ms 68,2ms 1141,8ms 10ms 920ms Startup/ Checksum 20% 80% T=110ms 20% 80% T=110ms TSignal =1000ms T=1210ms Start Repetition Technical drawing terminal terminal 16 I Hella
Sensors Level sensors Measurement of fluid levels (static and dynamic) Temperature evaluation (T 1 Temp) 20 % of the PWM blocking period T 1 (22 ms) corresponds to the lowest measuring point of the measuring range of -40 C 80 % of the PWM blocking period T 1 (88 ms) corresponds to the highest point of the measuring range of 160 C DC T 1(T Temp) 80% 88ms 20% 22ms Temperature Duty Cycle (DC 1) -40ºC +160ºC Temperature Duty Cycle (D1) Oil filling level evaluation (T 2 level) 20 % of the PWM blocking period T 2 (22 ms) corresponds to the lowest measuring point of the measuring range of 20.9 mm 80 % of the PWM blocking period T 2 (88 ms) corresponds to the highest point of the measuring range of 65.9 mm DC T 2(Tlevel) 80% 88ms 20% 22ms Level Duty Cycle (DC 2) 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 T 3 = 68,2 ms (fixed) Total PWM blocking period T Signal = 1000 ms Pause signal 670 ms Tolerance of all time signals (from PWM cycle) ± 10 % Temp ( C) = (T 1/T - 0.32) 0.003 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. T Level (mm) = [(T 2 (T-0.2) x 75 + 15.56] x + 5.34 110 Calculation in the control unit Hella I 17
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Hella KGaA Hueck & Co. Rixbecker Straße 75 D-59552 Lippstadt/Germany Telefon + 49 29 41 38-3 11 74 Telefax + 49 29 41 38-4 73 11 74 www.hella.com/electric-electronics-components E-Mail: electric-electronics-components@hella.com Hella KGaA Hueck & Co., Lippstadt