Apogee Instruments MO-200 Manuale d'uso - Pagina 4

Sfoglia online o scarica il pdf Manuale d'uso per Strumenti di misura Apogee Instruments MO-200. Apogee Instruments MO-200 20. Oxygen meter

INTRODUCTION

Oxygen (O

) is the second most abundant gas in the atmosphere and is essential to life on Earth. Absolute oxygen

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.