The Fully Automated Arthur Phase V Respirometer with updated electronics, single or double units, and with the same unique features that have always set it apart from all other wastewater respirometers.
Double Unit Arthur Respirometer in Waterbath Model #028-202 Phase V
. Same vigorous airlift mixing as in a full scale activated sludge plant
. Never a shortage of air supplied during testing. Oxygen transfer superior to any other repirometer.
. Never a need to dilute or filter high solids samples
. Instrument ready to begin testing upon startup. Test results in minutes.
. 2-liter sample chambers test large, truly representative samples.
PHASE V Fully Automated Arthur Bench Respirometer
Single Unit Arthur
Sludge Respirometer in Waterbath
Model No. 028-201 Phase V
Features of the Arthur Automatic Respirometer
. Aerobic or anaerobic test capability . Single or Dual test chambers . Waterbath for temperature control . Atmospheric pressure compensation . No limit on oxygen supplied to test chambers, air comes directly from atmosphere as needed . Vigorous Airlift Mixing prevents settling, permits testing of high solids samples without dilution . Excellent oxygen transfer . Modular construction for easy cleaning, replacement of parts. . Continuous graphic readout of changes in respiration . On-board computer with touch screen controls . Tests liquids, solids or slurries . No contact between sensor and sample
Operation Principle The Arthur Activated Sludge Respirometer is available with single or dual test chambers within a waterbath tank. Each measuring device utilzes a combination of sample chamber, carbon dioxide scrubber, sensitive gas volume transducer, air reservoir and foam trap, air pump and automatic gas exchange system. The latter four are located in separate sealed compartments that can be easily disconnected and replaced if necessary. 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 utilzes 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 tranducer. The transducer converts the volume of oxygen used to an electrical signal which is fed to a computer. The instrument produces a continuous graphical record of respiration. It can also be used to measure volume of gas produced, as in anaerobic processes.
BASIC COMPONENTS Each Arthur Bench
Respirometer consists of five main components:
2.CO2 Scrubber chamber
5.Electronics cabinet with Touch Screen & On-board Computer
The Sample Chamber, CO2
scrubber and Respirometer module are connected to each other with tubing and quick disconnects.
Sample Chamber...The instrument is normally furnished with a two-liter
cylindrical chamber, but various sizesand shapes are available.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 can be removed and
disassembled to clean.When installed, each
Sample Chamber is connected to a valved drain.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 porous
stage and the air flows up through the stage.
Respirometer Module...This rectangular shaped module is located behind the Sample Chamber and CO2 Scrubber Chamber in the waterbath. It consists of an assembly frame with volumetric transducer box attached, an air reservoir and foam trap, an automatic gas exchange system box and an air pump box. The air reservoir and foam trap, gas exchange system box and the air pump box can be easily removed from the assembly frame. A drain is provided to remove the oil from the volumetric transducer.
Water Bath.... Respiration tests can be performed at a full range
of temperatures using the waterbath.The
water in the bath completely covers the respirometer module, sample chamber and
CO2 Scrubber.Temperature control can be obtained by using
an Immersion Heater in the waterbath. Cooling can be provided with an Immersion
The Electronics Module...All controls to operate the respirometer are contained in
the electronics module.This includes a
power switch with indicating light, on-off switches for atmospheric pressure
compensation, automtic venting and zero and span adjustment controls.
The respirometer is
calibrated by withdrawing a prescribed amount of air with a calibrated syringe.
No............................................028-201 Phase V Single
No..........................................028-202 Phase V Double
(2-Liter): Inside, 4"D x 13"H Other sizes available:
Module - Outside 4" W x 7 7/8"D x 15 7/16"H
.CO2 Scrubber - Inside 2 1/2"D
................................110 pounds (Double Unit)