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General questions

Your questions - our answers!

Why do I need gas analysis in the case of aerobe bio-processes?

By observing aerobe processes by means of gas analysis a direct deduction can be made on the condition of the cultivation.
Thus, for instance, oxygen or substrate limitation can be recognised immediately. On the basis of the gas analysis growth rates [ยต] can also be calculated.

Can a process be controlled based on gas analysis?

Gas analysis is excellently suited to regulate bioprocesses as this analysis method is very resistant to failure. By using BlueSens sensors precise measurement values can be analysed directly in the exhaust line. Thereby parameters such as e.g. the oxygen uptake rate (OUR or OTR), carbon dioxide production rate (CER or CTR) and the resulting respiration quotient (RQ) can be calculated. Then, to prevent oxygen limitations, the gassing rate and the rotation speed of the fermenter agitator can be adjusted. By the well-directed substrate feed (based on the RQ) unwanted effects (e.g. Crabtree) can be prevented.

Why does BlueSens offer individual sensors and no central gas analyzers?

a) the individual sensors can be implemented more flexibly

b) BlueSens sensors can be integrated directly in pipes (exhaust gas line) and do not require gas treatment (e.g. cooling)

Why does BlueSens not offer any gas multiplexers?

The idea of gas multiplexing is based on the fact that gas analysers are expensive, that measuring gas has to be dried and by no means may particles enter the analyser. The BlueSens sensors have been especially developed for processes with high water contents and pollution burden.
a) no exhaust gas cooler required
b) avoidance of long gas feed lines
c) no complex valve circuits required
d) additional software for the control of the valves and measured data collection superfluous
e) measurement conform with PAT
f) Regulation by large amount of available data possible

What is the life expectancy for BlueSens sensors?

The life expectancy depends on the measuring principle.
a) based on their principle infrared sensors last for 2-3 years
b) in the case of electro-chemical sensors life expectancy for the O2 sensors is 900,000Vol%h
c) Zirconium dioxide-sensors last, based on their principle, for approx. 15,000 operating hours

What measuring intervals are necessary and possible?

BlueSens sensors measure non-stop and every customer can decide at which measuring intervals he would like to get the measured values.

How can the data from the gas analyzing system be transferred to a computer or process control?

The transfer can be effected by means of a
a) power signal 4-20mA
b) serial data transfer RS232
c) Ethernet TCP/IP
d) USB
e) RS485

How much do BlueSens sensors cost?

We gladly submit a quotation without engagement. Please contact our sales team.