PFS Specifications

Capabilities

The PFM/PAM Module - when operated together with the Photoacoustic Analyser Module (PAM) plus the Gas Delivery System (GDS) - forms a respiratory facility capable of a wide range of respiratory and cardiovascular measurements. These are:

• Breath-by-breath measurements of VO₂, VCO₂, VE
• Diffusing capacity of the lung for CO.
• Expiratory Reserve Volume.
• Forced Expired Spirometry.
• Functional Residual Capacity.
• Respiratory exchange ratio VO₂/VCO₂.
• Residual Volume.
• Total Lung Capacity.
• Tidal Volume.
• Alveolar Ventilation.
• Vital Capacity.
• Volume of pulmonary capillary blood.
• Dead-space ventilation.
• Cardiac output.
• Fractional inspiratory and expiratory concentrations, FIO2 and FEO2, FICO2and FECO2.
• Numerous other specialised tests of pulmonary function.

The PFM/PAM unit consists of the Respiratory Valve Unit (RVU), with associated flow-meters, rebreathing bag, etc., and an electronics unit. The electronics unit is accommodated in a standard ISS drawer.

The PFS contains three basic modules for analyzing the gasses in the inspired and expired air:

• Multi-Gas Analyzer (PGA-1) for measuring three gases (SF-6, CO₂, C₂H₂)
• Multi-Gas Analyzer (PGA-2) for measuring three gases (CO, R-22,CH₄)
• Oxigraf analyser for Oxygen measurement

Other subsystems

The PFS contains a number of subsystems to measure other parameters:

• Ambient Conditions Monitoring Subsystem (ACMS)
  • Relative humidity (Range 0…100% RH)
  • Temperature (Range of 5…50°C)
  • Pressure (Range of 800…1100 hPa)
• Differential Pressure Flowmeter (DPFM)
  • Flow range -15 l/s to + 15 l/s.
• Turbine Flowmeter (TFM)
  • Flow range -10 l/s to + 10 l/s.
• Respiratory Inductance Plethysmograph (RIP)
  • Measure cross-sectional area variations at thorax and upper abdomen, of up to 200 cm² in both cross-sections.

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