mount the sensor on the north side of the building or within a shaded area of the unit cabinet to avoid "solar loading

It provides additional headroom for electrical loads

Designed with a flexible bellyband configuration

or cracked metal during a heat exchanger inspection

Dwyer Instruments A-350 Aspirator Bulb 340793-762 mount the sensor on theIf you're out in the field running leak checking tests or validating pressure switch calibration, the Dwyer A 350 Aspirator Bulb is a staple in the technicians bag. This manual pump is engineered to provide a reliable source of positive pressure or vacuum for various HVAC test instruments. By simply connecting your 1 4 inch tubing to the barbed fitting, you can generate the required pressure with a single hand. For vacuum applications, such as pulling