The LF35(AFS) is general-purpose airflow proving switches designed for HVAC, detection of blocked filters and fans suction, airflow monitoring in ducts, pipes, tunnels, and other energy management applications. It may be used to sense positive, negative or differential air pressure.
The plated housing contains a diaphragm, a calibration spring, and a snap-acting switch. The sample connections located on each side of the diaphragm accept a 0.25" OD tubing via the integral compression and nut. An enclosure cover guards against accidental contact with the live switch terminal screws and the set point adjusting screw. The enclosure cover will accept a 0.5" conduit connection. The LF35(AFS)-460 has a reset button located on the top surface of the enclosure cover.
| Model | LF35-1 | LF35-2 |
| Medium | Air | |
| Mounting Position | The diaphragm in any vertical plane | |
| Field Adjustable Range | 0.5±0.05 mbar to 30.0 mbar | 0.2±0.05 mbar to 5.0 mbar |
| Switch Differential | Progressive, increasing from approximately 0.05 mbar at minimum set point to approximately 2.0mbar at maximum set point. | Progressive, increasing from approximately 0.05 mbar at minimum set point to approximately 0.25mbar at maximum set point. |
| Maximum Pressure | 30mbar | |
| Operating Temperature Range | -40°C ~ 82°C | |
| Electrical Rating | 300 VA pilot duty at 115-277VAC, 10A, non-inductive, 277VAC | |
| Electrical Connections | Screw top terminals with cup washers | |
| Sample Line Connections | Ferrule and nut compression type connectors that accept 0.25*OD rgid or semi-rigid tubing;male 0.25*slip-on connector | |
| Contact Arrangement | SPDT | |
Conversion: 1mbar=100Pa 1"W.C.=249Pa
