The AT-1900 series compact low differential pressure switches with ATEX/IECEx certification are our most popular switches and are now available in explosion-proof enclosures. These pressure switches combine advanced design and precise construction, enabling them to handle tasks usually reserved for larger, more expensive units. For air and non-flammable compatible gases, the AT-1900 series switches have set points ranging from 0.07 to 20 w.c (1.8-508 mm). Adjusting the set points is easy, with the range screw located inside the switch housing. The AT-1900 series switches feature an aluminum housing, making them ideal for low-pressure applications in hazardous areas.  

Installation Notes:  

- Cables must be installed via a 1/2” NPT cable gland or an ATEX/IECEx conduit (not supplied with the instrument);  

- Make sure to close the cover and cable gland after wiring to maintain the IP66 rating;  

- Only open the cover when the instrument is powered off.  

Note: To use the instrument safely in hazardous areas, check your local safety regulations and the warnings in the equipment manual.  

Please refer to the non-ATEX/IECEx certified 1900 series.

● Explosion-proof housing protects equipment in hazardous areas

● Compact size and repeatability make these switches highly valuable for many industrial and OEM applications

● Wide model range from 0.07 w.c. to 20 w.c., meeting the strict low-pressure switch specifications for OEMs

● The range knob is protected inside the switch housing, preventing outside interference