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2022-05-09
Level sensors (Generation 4)
Making sure the (oil) level is always right: The latest generation of HELLA level sensors ensure that the liquid level is accurately recorded so that appropriate action can be taken if the level is too high or too low. For this reason, level sensors are particularly important for detecting oil level.
Oil level sensors continuously measure the oil level in the static and mechanical ranges and supply this data accordingly. In this way, expensive engine damage, for example due to a break in the oil film, can be effectively avoided. In addition to the oil level, the integrated temperature sensor can contribute an input variable for the engine’s thermal management.
Compared to sensors with many different electronic components, HELLA PULS (packed ultrasonic level sensor) oil level sensors are particularly resistant to shocks and vibrations. This is ensured by the individual multi-chip module, on which ultrasonic and temperature sensors as well as an ASIC (application integrated circuit) are integrated. HELLA oil level sensors are flush mounted vertically from below in the bottom of the oil pan.
Making sure the (oil) level is always right: The latest generation of HELLA level sensors ensure that the liquid level is accurately recorded so that appropriate action can be taken if the level is too high or too low. For this reason, level sensors are particularly important for detecting oil level.
Oil level sensors continuously measure the oil level in the static and mechanical ranges and supply this data accordingly. In this way, expensive engine damage, for example due to a break in the oil film, can be effectively avoided. In addition to the oil level, the integrated temperature sensor can contribute an input variable for the engine’s thermal management.
Compared to sensors with many different electronic components, HELLA PULS (packed ultrasonic level sensor) oil level sensors are particularly resistant to shocks and vibrations. This is ensured by the individual multi-chip module, on which ultrasonic and temperature sensors as well as an ASIC (application integrated circuit) are integrated. HELLA oil level sensors are flush mounted vertically from below in the bottom of the oil pan.
The level sensor for continual measurement of liquid level in the static and dynamic range. Damping cup 85 mm.
This picture shows an oil level sensor with a damping cup length of 109 mm.
The PULS (Packed Ultrasonic Level Sensor) is designed to be vertically flush-mounted from below into the bottom of the oil pan. Damping cup 150 mm.
Technical drawing of the level sensor. “L” here indicates the variable length of the damping cup.
Technical Data
| Operating voltage (for oil level measurement) | 9 – 16 V |
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Operating voltage (for temperature measurement) |
9 – 16 V |
|
Polarity reversal voltage |
-14 V / 60 s |
| Overvoltage | 15 s at 28 V; 250 ms at 32 V |
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Measuring range (static and dynamic) |
13 mm to L -6 mm1) |
| Operating temperature |
-40 °C to +160 °C |
| Operating temperature (for oil level measurement)1) |
-10 °C to +150 °C |
| Re-heating temperature |
Max. 5,700 h at 125 °C; |
| Storage temperature |
-40 °C to +150 °C |
| Current consumption | 8 mA |
| Max. current consumption during measurement | 50 mA |
| Report2) | PWM |
| Protection class | IP 6K9K |
| Weight | Variant-dependent |
| Viscosities | 1 mm2/s to 1,300 mm2/s |
1) Depending on damping cup length (see variant overview)
2) Level output above -10 °C. At temperatures below -10 °C,
an “empty” signal is sent (18 mm) together with the diagnostic signal “Out of tolerance”.
Program Overview
| Variant | Measuring range | Part number | Packaging unit |
|---|---|---|---|
| Length of damping cup 85 mm | Static and dynamic 13 – 79 mm | Available upon request | 1 |
| Length of damping cup 95 mm | Static and dynamic 13 – 89 mm | Available upon request | 1 |
| Length of damping cup 109.8 mm | Static and dynamic 13 – 103.8 mm | Available upon request | 1 |
| Length of damping cup 135 mm | Static and dynamic 13 – 129 mm | Available upon request | 1 |
| Length of damping cup 150 mm | Static and dynamic 13 – 144 mm | Available upon request | 1 |