Nozzle selection
To select a suitable nozzle for your application, observe the following:

1. The ND and NQ nozzles have an integrated pre-heating plate for pre-heating components by means of contact heat. Air outlet slots are located around the plate with a width of approx. 1 mm for the hot air.

2. The nozzle dimensions named in the brochure correspond to inside dimensions. The dimensions of the integrated pre-heating plate are calculated by subtracting the air outlet slot dimension from the nozzle dimensions.

3. Ensure that the component is not larger than the integrated pre-heating plate to avoid obstruction of the air outlet.

4. The type D (Dual) nozzles have air outlet slots on two opposing sides. Dimension designates the lengths of the heated side.

5. The type Q (Quad) nozzles have air outlet slots on all four sides.

As the transfer of heat for the reflow process is mainly by means of contact heat of the nozzle plate, the hot air nozzle must "fit" exactly. A tolerance of a few 0.1 mm during nozzle selection is perfectly acceptable and does not have a negative influence on desoldering quality.