Product Analysis: Kobold PSR-11 Mechanical Flow Switch Series
The Kobold PSR-11 series represents the foundational engineering for mechanical paddle-type flow monitoring in industrial environments. This series is recognized globally for its robust construction, simplicity of operation, and versatility across a wide range of liquid media. The PSR-11 is the go-to solution for engineers seeking a reliable mechanical switch for water treatment, industrial heating systems, and cooling protection for high-value manufacturing equipment.
Modular Design and Material Quality
The PSR-11 series is primarily defined by its Brass (Ms 58) housing and its ability to accommodate various paddle sizes for different pipe diameters. By using a spring-loaded paddle design, the switch remains independent of the specific gravity of the liquid to a high degree. The magnetic coupling principle used in the PSR-11 series means that the reed contact is hermetically separated from the flowing medium, allowing for high pressure resistance and preventing the ingress of media into the electrical components.
Key Technical Characteristics
- Series: PSR-11.
- Standard Housing: Brass (Ms 58).
- Available Threads: G 1/4 to G 1 1/2.
- Max Operating Pressure: 250 bar.
- Max Operating Temp: 110°C.
- Switching Logic: Reed contact (Normally Open, Normally Closed, or SPDT).
- Contact Material: Rhodium or Gold-plated (depending on load).
- Maintenance: Highly serviceable design.
Operational Benefits
One of the standout features of the PSR-11 series is its Universal Mounting. It can be installed in horizontal or vertical pipe runs, providing system designers with maximum flexibility. In the event of a flow failure, the internal spring ensures the paddle returns to its rest position instantly, triggering the reed contact to shut down pumps or sound alarms. This rapid response is critical for preventing catastrophic failures in cooling lines for induction furnaces or high-speed gearboxes.
| Category | Specification |
| Protection Rating | IP65 (NEMA 4 equivalent) |
| Accuracy Grade | High Repeatability (± 1%) |
| Certification | CE Marked / Industrial Standard |
Technical Note
The PSR-11 is a passive mechanical switch that requires no external power to operate the paddle mechanism, although power is required for the electrical signal through the reed contact. For aggressive media such as acids or sea water, the stainless steel version (PSR-12) is recommended as a direct material upgrade.
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