Apogee Instruments MO-200 Manual do Proprietário - Página 4
Procurar online ou descarregar pdf Manual do Proprietário para Instrumentos de medição Apogee Instruments MO-200. Apogee Instruments MO-200 20 páginas. Oxygen meter
Imprimir página
4
INTRODUCTION
Oxygen (O
) is the second most abundant gas in the atmosphere and is essential to life on Earth. Absolute oxygen
2
concentration determines the rate of many biological and chemical processes. Oxygen is required for aerobic respiration. In
addition to measurements of absolute oxygen concentration, relative oxygen concentration is also often measured and
reported.
Oxygen sensors are used to measure gaseous or dissolved oxygen. There are multiple different techniques for measuring
gaseous oxygen. Three of the more widely used sensors for environmental applications are galvanic cell sensors, polarographic
sensors, and optical sensors. Galvanic cell and polarographic sensors operate similarly, by electrochemical reaction of oxygen
with an electrolyte to produce an electrical current. The electrochemical reaction consumes a small amount of oxygen. Unlike
polarographic oxygen sensors, galvanic cell sensors are self-powered and do not require input power for operation. Optical
oxygen sensors use fiber optics and a fluorescence method to measure oxygen via spectrometry.
Typical applications of Apogee oxygen meters include measurement of oxygen in laboratory experiments, monitoring
gaseous oxygen in indoor environments for climate control, monitoring of oxygen levels in compost piles and mine tailings,
and determination of respiration rates through measurement of oxygen consumption in sealed chambers or measurement
of oxygen gradients in soil/porous media. Apogee oxygen sensors are not intended for use as medical monitoring devices.
Apogee Instruments MO-200 oxygen meters consists of a handheld meter and a dedicated oxygen sensor connected by
cable. The separate sensor consists of a galvanic cell sensing element (electrochemical cell), Teflon membrane, and signal
processing circuitry mounted in a polypropylene plastic housing. The MO-200 oxygen meter includes manual or automatic
data logging features for making spot-check measurements or monitoring oxygen concentration over time.