The Dwyer Instruments 3003C Photohelic Pressure Switch is a compact pressure-sensing device that combines a sensing element with a switch output under the Dwyer Photohelic line. It provides a sensing range of 0–3 in. water (water column) and 25 PSIG, enabling detection across both low and higher pressure conditions within that span. This model is used to drive electrical circuits when pressure crosses the set point, making it suitable for process or HVAC control applications where reliable pressure monitoring is required.
