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FEATURES OF THE ARTHUR SIMPLIFIED RESPIROMETER Model No. 026-301  The principal difference in this simplified model and the automated respirometer is that the use of oxygen must be manually read in the Simplified Respirometer. This model will perform most of the same tests, but requires more labor. It was developed primarily for use by smaller wastewater treatment plants with limited budgets, and where a great many tests will not be run on a regular basis. It is also ideal for high school and college laboratories. A water bath for temperature control is not a standard feature, but can be supplied upon request. This is a very simple, rugged instrument. FEATURES Aerobic or anaerobic test capability No contact between sensor and sample tested No limit on ambient air supplied to test chambers Vigorous airlift mixing of liquids prevents settling Fine bubble diffusion ensures excellent oxygen transfer Modular construction for easy cleaning, replacement of parts OPERATION PRINCIPLE Each measuring device utilizes a combination of sample chamber, carbon dioxide scrubber, volume manometer and air pump. The air pump provides continuous air circulation through the sample chamber and the scrubber. The entire air system is closed to the atmosphere. As the specimen in the chamber utilizes oxygen and generates carbon dioxide, the carbon dioxide is immediately removed by the caustic solution in the scrubber. The volume of carbon dioxide produced is, therefore, not present to balance the volume of oxygen utilized, and there is a net loss of gas volume equal to the volume of oxygen utilized. The change of gas volume is sensed by the gas volume manometer. It can also be used to measure the volume of gas produced, as in anaerobic processes. BASIC COMPONENTS Sample Chamber The instrument has a standard two-liter cylindrical chamber, but other sizes and shapes can also be provided. On the removable top of the sample chamber is a fill tube closed with a threaded plug. The plug is fitted with a syringe connector for calibration. Sample Chambers are disassembled to clean. With liquid samples the chamber utilizes an airlift pump to aerate and mix the sample. Air is distributed at the base of the airlift column through a fine bubble diffuser. Solid samples are usually placed on a set of porous, acrylic stages and air flows continuously through the solid samples on the stages. CO2 Scrubber...The CO2 Scrubber is an acrylic tubular Air Pump...The Air Pump continuously forces air through the SPECIFICATIONS Model No............................................026-301 Single . Sample Chamber
(2-Liter): Inside, 4"D x 13"H . CO2 Scrubber - Inside 2 1/2"D x 13"H Shipping Weight........................ 30 pounds Air Pump..............Pumping rate: 3 L/min at 1 ft. Head Air Capacities...............................1000 ml without venting Range of total oxygen demand.........................not limited Power Source...100-240V AC 50-60 Hz Precision.................+ 2% as measured with sodium sulfite
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