Air differential pressure switch kit for commercial kitchen extraction interlock compliance with BS 6173, IGEM/UP/19 and GSIUR Regulation 27(4). Detects airflow in the extraction duct — triggers gas supply isolation if airflow fails. 0.2–2mbar range, 230V AC SPDT 10A, nitrile diaphragm, 80°C media temperature rating. Supplied complete with duct kit and knock-off switch. Hamilton Gas Products.
The air differential pressure switch is the extraction fan monitoring component of a commercial kitchen gas interlock system. It is fitted in or adjacent to the extraction duct and detects the pressure differential created by the extraction fan running. When the fan is operating and creating sufficient airflow, the pressure differential exceeds the switch set point and the switch signals the interlock control panel to allow gas flow. If the fan stops, fails, or airflow drops below the threshold, the pressure differential falls, the switch triggers, and the control panel closes the gas solenoid valve — isolating the gas supply to all appliances.
This kit is the pressure switch assembly for use with a separately purchased interlock control panel (such as the Banico Gas-Minder 4 ISP-3 or equivalent). It is not a standalone interlock system — a control panel and a gas solenoid valve are also required to complete a compliant installation. The switch operates across positive, negative, vacuum and differential pressure configurations. Installation must be carried out by a Gas Safe registered engineer.
BS 6173 requires all commercial kitchen gas installations to be interlocked with the mechanical ventilation system — gas supply must be automatically cut if extraction fails. GSIUR Regulation 27(4) specifically requires this interlock where a canopy extraction system is performing the function of a flue for Type B appliances (convection ovens, some deep fat fryers) that would otherwise need a dedicated flue. Both requirements apply simultaneously in most commercial kitchen installations.
BS 6173 compliant extraction interlock pressure switch — duct kit and knock-off switch included. Order today. A Gas Safe registered engineer must install this component. An interlock control panel (e.g. Banico Gas-Minder 4 ISP-3) and a gas solenoid valve are also required for a complete installation.
| Brand | Hamilton Gas Products |
|---|---|
| Product Type | Air Differential Pressure Switch – Extraction Interlock Kit |
| Operating Range | 0.2 – 2 mbar |
| Differential | Approx. 0.1 mbar |
| Max Pressure | 25 mbar |
| Electrical Rating | 230V AC SPDT 10(2)A |
| Diaphragm Material | Nitrile |
| Media Temperature | Up to 80°C |
| Pressure Modes | Positive, negative, vacuum & differential |
| Included | Duct kit & knock-off switch |
| Compliance | BS 6173, IGEM/UP/19, GSIUR Regulation 27(4) |
| Note | Pressure switch component only — interlock control panel and gas solenoid valve required separately |
