Each mass-flow regulator is controlled by a microprocessor in order to obtain the desired NO concentration at the point of entry into the ventilator.
The second disadvantage of this mode of administration is the fact that mass-flow regulators are expensive.
Mass-flow regulators are used to mix oxygen, air and NO before their entry into the low pressure inlet of the ventilator (NOMIUS system adapted to the Siemen's Servo 900 C ventilator).
The air with controlled humidity was pumped into the chamber at a rate of 16.7 cm3 s−1, adjusted with a mass air flow regulator.
The Ar flux determined using a mass flow-controlled regulator was maintained at 50.0 sccm, and the sputtering pressure was 0.5 Pa.
(1) Gas cylinders, (2) pressure regulators, (3) needle valves, (4) mass flow controllers, (5) monometers, (6) non-return valves, (7) ball valves, (8) tubular furnace, (9) reactor, (10) catalyst bed, (11) trap, (12) condenser, (13) silica gel column, and (14) gas chromatograph (GC).
Mass flows and pressures were regulated using Bronkhorst mass flow and pressure controllers.
Initial studies were carried out using a 2 L fermenter (1.5 L working volume) equipped with a 502D agitator (LH Fermentation, Maidenhead, UK), an LH temperature regulator (LH Fermentation, Maidenhead, UK), a GFM17 mass flow meter (Aalborg®, US) and attached to an MX3 Bio sampler autosampler (New Brunswick Scientific, USA).
Pressure in the line is controlled by a precision pressure regulator that sets the input pressure to the 4-channel mass flow meter/controller where the flow is divided into 4 gas streams and provided to the sample chambers.
The system included two gas regulators with dual pressure gauges and output control valves, two mass flow controllers (one was calibrated for CO2 flow and the other was calibrated for N2), two check valves (to control the flow in one direction), and a bypass line (for calibrating the mass spectrometer from the feed gas mixture).
