Teledyne’s Model 3000MA Paramagnetic Percent Oxygen Analyzer is a versatile, microprocessor based instrument specifically designed to detect oxygen in a variety of gases. The 3000MA is a precise, cost effective instrument capable of measuring percent oxygen in as low as the 0–1% range.
Teledyne’s Model 3000MA Paramagnetic Percent Oxygen Analyzer is a versatile, microprocessor based instrument specifically designed to detect oxygen in a variety of gases. The 3000MA is a precise, cost effective instrument capable of measuring percent oxygen in as low as the 0–1% range. Drawing on the solid performance of Teledyne’s highly successful 3000 series control platform, the 3000MA provides the user with a wide variety of features and options to satisfy virtually any application.
Principle of measurement
The physical property distinguishing oxygen from other gases is its paramagnetism which is significantly greater than that of common gases. Consequently the molecules of oxygen are attracted by strong magnetic fields which can be used in detection. A paramagnetic sensor consists of two spheres arranged in the form of a dumbbell suspended in a symmetrical, non-uniform magnetic field. When the surrounding gas contains oxygen, the dumbbell spheres rotate out of the magnetic field by the relatively strong ttraction of oxygen. A light beam focused on a mirror attached to the dumbbell reflects asymmetrically onto two photo diodes resulting in a voltage shift. The voltage difference produces a current used to drive the dumbbells back to the original position. The current flow required to maintain the null position is directly proportional to the oxygen concentration and is shown linearly in volume percent oxygen in the display. Properly maintained paramagnetic sensors last for years with little or no attention making them ideal for critical measurements in the low percent range.
The 3000MA offers three dynamic, user configurable ranges plus autoranging, and can be calibrated in any range. The instrument is linear on all three ranges, eliminating the need to recalibrate while switching between ranges. The analyzer comes standard with an isolated 4–20 mADC output for oxygen concentration and range identification. Additionally, a bi-directional RS-232C serial communication interface provides for remote monitoring and control of span and zero functions. Teledyne provides auto-calibration capabilities as a standard feature in the 3000 series platform.