Technical Description: Kobold AFK-G1T Flow Switch
The Kobold AFK-G1T is a heavy-duty vane-type flow switch engineered for the monitoring of air and gaseous media within industrial ductwork and large piping systems. It serves as a critical safety component for HVAC systems, industrial drying ovens, and clean rooms. Its primary function is to monitor the airflow to prevent heater banks from overheating or to signal an alarm in the event of a ventilation fan failure.
Engineering and Mechanical Reliability
The AFK-G1T operates via a spring-loaded vane (paddle) that is moved by the kinetic energy of the airflow. When the flow rate reaches the user-defined threshold, the vane displaces a magnet which triggers a hermetically sealed SPDT microswitch. The «G1T» designation signifies a 1-inch (G 1) male process connection, suitable for mounting via a threaded socket or a duct adapter. This mechanical design requires no external power to operate the switch logic, ensuring fail-safe performance even during electrical interruptions.
Key Characteristics
- Part Number: AFK-G1T.
- Connection: G 1 (1 inch) male thread.
- Switching Range: 2.5…10.0 m/s (Standard air).
- Max Operating Temp: 85°C.
- Output: SPDT Microswitch (Changeover contact).
- Housing Material: Brass base with plastic cover (IP65).
- Vane Material: Stainless steel.
- Adjustment: Internal calibration screw for setpoint.
System Versatility and Durability
The AFK-G1T is built for the rigors of industrial ventilation. Its stainless steel vane is resistant to vibration and minor corrosion, while the IP65-rated housing protects the electrical contacts from dust and moisture. The unit can switch high-current loads directly, such as alarm sirens or contactor coils for motor control. It is a cost-effective and highly reliable solution for air-handling units where electronic sensors might be prone to electrical noise interference.
| Category | Specification |
| Switching Hysteresis | Approx. 15% of flow |
| Max Pressure | Atmospheric (Standard duct use) |
| Installation | Duct or pipe mount |
Maintenance Insights
The AFK series is virtually maintenance-free. However, in environments with high dust or grease concentrations, it is recommended to inspect the vane annually to ensure that buildup has not altered the switching point. The SPDT contact allows for both «flow presence» and «flow absence» logic to be wired simultaneously for maximum safety.
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