US-based SPX Flow Inc, which engineers, designs, manufactures, and markets products used to process, blend, filter, dry, meter and transport fluids, is currently involved in a project that will see it establishing a dairy ingredients plant in Galicia, Spain.
Expired air was collected for at least the final three consecutive minutes of the GXT and for 2 min during the verification test and analysed using the Douglas bag technique, using a gas analyser (Series 1400; Servomex Ltd, Sussex, UK) and a dry gas meter (Harvard Apparatus, Kent, UK).
The exact air volumes were measured with a calibrated Schlumberger G1.6 dry gas meter and corrected for measured air temperature and pressure.
The volume of air sampled by each filter was measured using a calibrated dry gas meter.
The volume of the Douglas bag was measured by a dry gas meter (Harvard, USA), with the aid of a vacuum pump on the exit port.
Expired O2 and CO2 gas concentrations were measured using a mass spectrometer ARCO-1000AA, ARCO SYSTEM, Chiba, Japan), and gas volume was measured using a dry gas meter (DC-5C Shinagawa Seiki, Tokyo, Japan).
Expired air was analysed for oxygen and carbon dioxide concentration (Servomex 1440, Servomex Group Ltd ,Crowborough, UK) and volume and temperature (Harvard dry gas meter, Harvard Apparatus Ltd, Kent, England, UK; Fisher Scientific Ltd ,Loughborough, England, UK).
The volume of expired air was established using a dry gas meter (Harvard Apparatus), with the temperature of the expired gases measured using a CheckTemp1C (Hanna Instruments) during evacuation from the Douglas bags.
The expired gas collected by the DBM was immediately measured by the calibrated S-3A oxygen and CD-3A carbon dioxide analyzers and then passed through the dry gas meter whose accuracy (0.8% error) had been previously checked using multiple pumps of a 3-L calibration syringe (Hans Rudolph).
As described by Bird et al. (2008), air flow through each chamber (mean=98.8 l/min) was measured using an AL800 dry gas meter (American Metering Company, Nebraska City, NE, USA) and CH4 concentration (ppmv) measured in incoming and exhaust air streams using an Innova 1312 Multigas Analyser (California Analytical Instruments, Orange, CA, USA).
The volume of expired air was measured with the certified dry gas meter (Shinagawa Seisakusho, Tokyo), and the sample of expired air was analyzed for O2 and CO2 concentrations in duplicate with a Roken-shiki portable gas analyzer (Shimada, Tokyo; a modified Hal-dane gas analysis apparatus that can be used without a supply of electric power).
