Most N2 feed rate control is done through O2 monitoring. Google => oxygen sensor instrumentation
Amoung the oxygen monitor suppliers that tailor themselves to reflow machines are: * MapCheck 9000 Process Oxygen Monitor [Topac; 231 CJC Hwy, Suite 103 Cohasset MA 02025; 781-740-8778 F781-740-8779 topac.com sales@topac.com] * Oxygen and Nitrogen control system Model 9500 [Systech Instruments; 17 Thame Park Business Centre, Wenman Rd, Thame, Oxon, OX9 3XA UK; +44 (0)1844 216838 sales@systech.co.uk systechinstruments.com]
Often, equipment suppliers rig soldering machines that are intended to use N2 differently than other machines to help minimize N2 consumption.
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