EDS3-125B

PARAMAGNETIC OXYGEN ANALYZER DATA SHEET This product is a dumbbell type paramagnetic oxygen analyzer. Because this analyzer is based on that the magnetic susceptibility of oxygen gas is larger than coexisting gases, stable measurement is ensured unaffected by coexisting gases. The detector does not have a heating part such as heater. Therefore, this analyzer is suited for measuring the oxygen concentration in flammable gas. Further, running cost can be saved since reference gas is not required. ZKG FEATURES 1. Since reference gas is unnecessary due to use of a dumbbell type paramagnetic system, this analyzer will not entail an additional running cost. 2. The principle of measurement is dependent on the strong magnetic property of oxygen molecules. Therefore, measurement is almost unaffected by other molecules weaker in magnetic property than oxygen. 3. Suited for measuring oxygen in flammable gas. 4. Small-sized and easy to handle. 5. Usable with a wide range of power supplies. 6. Output is linear. Flow rate of purge gas (option): 1 L/min, N2 or air (flowed for purging corrosive ambient gas) Power supply: 100 to 240 V AC, 50/60 Hz Power consumption: Approx. 35 VA Ambient temperature: 0 to 45˚C Ambient humidity: Less than 90% RH Warm-up time: Approx. 30 minutes Materials of gas-contacting parts: SUS304, SUS316, fluororubber, borosilicate glass, Electroless Nickel, platinum, platinum/ iridium alloy, PP, Toaron, PVDF (polyvinylidene fluoride), PPS resin Interference due to coexisting gas: Interfering Interfering gas gas concentration NO CO CO2 CH4 2000ppm 100vol% 100vol% 100vol% Interfering concentration 0.15vol% O2 max. 0.1vol%O2 max. – 0.35vol%O2 max. – 0.25vol%O2 max. SPECIFICATIONS Measuring range: 0 to 10, 21, 25, 50, 100% O2 Number of ranges: 1 or 2 ranges (selectable by code symbol) Measuring system: Paramagnetic (dumbbell type) Output signal: One of the following signals (selectable by code symbol) 4 to 20 mA DC (load resistance 550 Ω max.) 0 to 1 V DC (permissible load resistance 100 kΩ max.) 0 to 10 mV DC (permissible load resistance 100 kΩ max.) Repeatability: Within ± 0.5% of full scale Linearity: Within ± 1.0% of full scale Zero drift: Within ± 2.0% of full scale/week Span drift: Within ± 2.0% of full scale/week Response time: Within 15 sec (90% response) Flow rate of sample gas: 0.5 L/min ± 0.2 L/min Pressure loss: Approx. 0.3 kPa (at sample gas flow rate 0.5 L/min) Enclosure: Steel casing, for indoor application, flush mounting on panel Dimensions (H x W x D): 240 x 192 x 234 mm Weight: Approx. 5 kg Finish color: Munsell 10Y7.5/0.5 semi-gloss EDS3-125b Date Apr. 1, 2011 ZKG Measuring gas conditions: Temperature: 0 to 50˚C Humidity: Dew point at least 10˚C lower than ambient temperature Dust: Max. 100 µg/Nm3 in particles of max. 0.3 µm each Mist: Unallowable Pressure: 10 kPa or less Installation conditions: • The instrument must be protected from direct sunlight and heat radiation from objects at high temperature. • For installing the instrument outdoors, it must be protected from rain and wind with a suitable casing or cover. • The instrument must be installed in a clean atmosphere free from corrosive or flammable gas. • The instrument must be free from severe external vibrations. Mounting: Vertical mounting on panel Panel cutout dimensions (mm) 184 +2 0 CODE SYMBOLS 12345678 9 10 ZKG3 Y 3 1 2 3 4 5 0 1 2- Description Use (4th digit) With indication Measuring range (6th digit) 0 to 10 vol% 0 to 25 vol% 0 to 50 vol% 0 to 100 vol% 0 to 21 vol% Purge inlet (7th digit) Without purge gas inlet With purge gas inlet Y 2 3 4 5 A B C 2nd range (9th digit) Without 0 to 25 vol% 0 to 50 vol% 0 to 100 vol% 0 to 21 vol% Output signal (10th digit) DC 4 to 20mA DC 0 to 1V DC 0 to 10mV 90˚ PRINCIPLE OF MEASUREMENT Hanging wire Magnetic pole 232 +2 0 Double sphere (dumbbell) Feedback coil Magnetic pole Reflecting mirror Infrared ray source Light receiving element In the cell, two glass spheres filled with nitrogen gas are suspended with strong metal. At first, the spheres are kept in balance in an inhomogeneous magnetic field. When oxygen molecules having a large magnetic susceptibility flow there, the molecules are pulled toward the stronger magnetic field zone and the spheres are moved away from the zone. The resulting deviation of the spheres is detected with the light source, reflecting mirror and light receiving element, and a current is flowed through the feedback loop to control so that the spheres can return to the initial balanced state. The current flowing through the feedback loop is proportional to oxygen concentration. Thus, oxygen concentration is converted into an electric signal. 2 CONFIGURATION Sampling System Diagram (example: Oxygen measurement in boiler exhaust gas) Gas extractor Gas inlet tube Mist filter Aspirator Drain separator Electronic gas cooler Selector valve Flowmeter 0.5L/min Membrane filter of 0.3 µm max. ZKG oxygen analyzer Exhaust release into atmosphere Pressure regulator Safety drain trap Exhaust + drain Regulation valve Purge gas (when required) 1L/min Air or N2 N2 Zero gas O2 Span gas Standard gas for calibration SCOPE OF DELIVERY Analyzer main unit x 1 Panel mounting bracket x 2 Fuse 250 V AC/0.5 A delay type x 2 (1 accessory and 1 built in) Instruction manual x 1 CAUTIONS (1) Use the analyzer within the specified flow rate. If it is used beyond the specified flow rate for enhancing response, the sensor section may be damaged to cause an instrument trouble. (2) Before the analyzer, be sure to connect a flowmeter and filter (0.3 µm or finer mesh). (3) Use a shielded wire for signal line connection. (4) Analyzer exhaust should be released into the atmospheric air. 3 ZKG OUTLINE DIAGRAM (Unit : mm) Side View 140 t Panel 1.6