This sensor is used for detecting structural born vibrations in spark ignition engines due to uncontrolled combustion. This sensor is suitable for operation in extreme conditions.
Due to the inertia of the seismic mass, the sensor moves in correlation to the engine block vibration; this motion results in a compressive force which is converted into a voltage signal via a piezoceramic sensor element. As a result, upper and lower voltage thresholds can be defined directly correlating to an acceleration magnitude.
The main benefits of this sensor are its robust mechanical design, compact housing and precise determination of structure-related noise. Connection to this sensor can be tailored to customer requirements through specified wire lengths and various connector options.
- Downloads
- Features
- Application
- Technical Specifications
- Installation Notes
- Ordering Information
- Dimensions
- Legal Restrictions
Downloads
Features
- Frequency: 3 to 25 kHz
- Weight: 82 g
- Height sensor head: 18 mm
Application
|
Application |
3 to 25 kHz |
|
Operating temperature range |
-40 to 130°C |
|
Storage temperature range |
-30 to 60°C |
|
Max. vibration |
≤ 800 m/s2 |
Technical Specifications
Mechanical Data
Male thread (for cast) | M8x25 |
Male thread (for AI) | M8x30 |
Installation torque | 20 ± 5 Nm |
Weight w/o wire | 82 g |
Protection | IP 54 |
Electrical Data
Range of frequency | 3 to 25 kHz |
Sensitivity at 5 kHz | 28.8 mV/g |
Max. sensitivity changing (lifetime) | -17 % |
Linearity between 5 to 15 kHz (from 5 kHz value) | -10 to 10 % |
Linearity between 15 to 20 kHz (linear increasing with freq) | 20 to 50 % |
Main resonance frequency | > 30 kHz |
Impedance | > 1 MOhm |
Temperature dependence of sensitivity | 0.04 mV/g°C |
Capacity field | 1,150 ± 200 pF |
Connectors and Wires
Connector | A261.230.252 |
Mating connector 2-pole | 2-Pin RB-Kp.1 (D261.205.337-01) |
Pin 1 | Sig + |
Pin 2 | Sig - |
Sleeve | PUR |
Wire size | 0.5 mm2 |
Wire length L | 530 mm |
Various motorsport and automotive connectors on request. | |
Installation Notes
|
The KS4-R can be connected to all Bosch Motorsport ECUs featuring knock control |
|
The sensor must rest directly on the brass compression sleeve during operation. |
|
To ensure low-resonance coupling of the sensor to the measurement location, the contact surface must be clean and properly machined to provide a secure flush mounting. |
|
Please route the sensor wire in a way that prevents resonance vibration. |
|
Please find further application hints in the offer drawing at our homepage. |
Safety Note
The sensor is not intended to be used for safety related applications without appropriate measures for signal validation in the application system. |
Ordering Information
Knock Sensor KS4-R
Order number: 0261.231.218
Dimensions
Legal Restrictions
Due to embargo restrictions, sale of this product in Russia, Belarus, Iran, Syria, and North Korea is prohibited.