EET Inc.

Theory

A respirometer is a device used to measure the rate of respiration of living organisms including microorganisms by measuring their rates of consumption of oxygen or production of biomethane or biohydrogen.

The gas that is finely generated from a reactor will turn into a bubble shape in a BRS cell which is filled with oil.
Cumulative volume of gas generated is measured in two ways.
- 1)calculating the total amount of gas by fixing the bubble volume and multiplying by the number of bubbles.
- 2)calculating the total amount of gas by adding the volumes of each generated bubble, which is calculated using the time (T1, T2) taken by each bubble to pass through low and high sensors.
The device can be used for both aerobic and anaerobic operations for wastewater studies.
The device can be also used for biogas production, biomethane potential (BMP) analysis, or green energy studies (CO₂, CH₄, H₂ and N₂).
Up to eight devices can be connected to a common computer, supporting up to 32 channels.
The device uses temperature-based calibration to ensure accurate gas measurement.
After measurements, the time interval of gas production/consumption volume data can be changed by changing Cumulative Time in Data Convert.
An incubator or a water bath having magnetic stir plate can be used to maintain water temperature (0~50℃).
Measuring resolution (bubble volume) is very small (0.03 mL for BRS-110).
Bioreactors having volumes of 125, 250, 500, and 1000 mL can be used.

1) Fixed Bubble Volume Mode : Measures gas production (consumption) by counting bubbles in the measuring cell. (Select this mode when the gas generation (consumption) rate in the reactor is slow.)
2) Variable Bubble Volume Mode : Calculates the volume of each bubble as it is generated. (Select this mode when the gas generation (consumption) rate in the reactor is fast.)

* For more details, please refer to the manual.

Specification

	BRS-110	BRS-200	BRS-800
No. of channels	4 channels	4 channels	8 channels
No. of expandable channels	Expandable 16 channels in a computer	Expandable 16 channels in a computer	Expandable 32 channels in a computer
Flowrate	0~1 mL/min	1~5 mL/min	0~0.2 mL/min
Measuring resolution	Approx. 0.03 mL	Approx. 0.15 mL	Approx. 0.03 mL
Measuring interval	1 sec~10 hours(changeable)	1 sec~10 hours(changeable)	1 sec~10 hours(changeable)
Gases	O₂ (OUR), CO₂, CH₄, H₂, and N₂	O₂ (OUR), CO₂, CH₄, H₂, and N₂	O₂ (OUR), CO₂, CH₄, H₂, and N₂
Error	≤2%	≤2%	≤2%
Data output	USB	USB	USB
Power input	DC 12V, 3.5A	DC 12V, 3.5A	DC 12V, 3.5A
Weight	1.7 kg	1.7 kg	1.7 kg
Size	190 mm(W) * 130 mm(D) * 110 mm(H)	200 mm(W) * 140 mm(D) * 120 mm(H)	200 mm(W) * 140 mm(D) * 120 mm(H)
Temperature	0~50℃	0~50℃	0~50℃
Humidity	≤95%	≤95%	≤95%
Material	Aluminum	Aluminum	Aluminum