KAL-L - Thermal Air Flow Switch


  • Negligible Pressure Loss
  • No Moving Parts
  • Adjustable Response Time
  • Temperature Compensated
  • Easy to Install


The KAL-L flow switch allows rapid detection of flow rate change of non-hazardous gases. Fast reaction times are guaranteed by the KAL-L’s analog electronic design. Through use of two RTDs. . . one to sense flow and the other to detect ambient temperature, the switch can compensate for thermal changes in its surroundings. This “smart” behavior minimizes erroneous switching due to spurious changes caused by things such as the weather. Any conceivable pipe size can be accommodated by the KAL-L’s insertion style design. Knowledge of the flow velocity in your system is all that you need to make the KAL-L work.



Range: 3.3 - 66 ft/sec @20°C, 14.5 PSIA (restricted span for other pressure and temperature conditions)
Switchpoint: potentiometer adjustable
Accuracy: ±10% of flow rate
Reproducibility: ±1% of flow rate
Flow Rate: 8-LED flow trend
Switch Status: two-color LED
Maximum Temperature Gradient: 30°K(°C)/min @ 8m/s, 90°C
Response Time: 1 to 60 sec (adjustable)
Warm-up Time: 30 sec
Maximum Pressure: 120 PSIG
Maximum Temperature
Process: –10°F to +250°F
Ambient: +15°F to +140°F
Wetted Parts: Ni-plated brass
Housing Material: Nylon
Electrical Data
Power Supply: 24 VDC/VAC –15%/+10%
Switch: Qty. 1 - SPDT
Max. Voltage: 250 VAC
Max. Current: 4 A
Max. Power: 1,000 VA
Wiring Connector
Standard: PG13.5 cable gland
Optional: 1/2” NPT conduit
Protection: NEMA 4



KAL-L - Thermal Air Flow Switch



KAL-L - Thermal Air Flow Switch