In the past all CO systems were developed to compensate for environmental CO changes. Nowadays it proves that this is not working for a wide range of applications. The new generation of CO monitoring is now able to compensate also for CO peaks generated by external CO sources caused by for example industrial activities, coffee roasters or burning agricultural waste. The requirements are that all CO fluctuations measured on the reference are at the same time also measured on the exhaust and taking the behaviour of the dryer itself into account.
This principal is unique and up to now the only one available on the market and can only be done by using “Cross Flow Modulation Type NDIRAnalysers” for delta CO measurement.
ATEX CO Systems can detect the incipient development of a fire by sensing and comparing the inlet and outlet air for CO content. The System monitors the process air for the presence of volatile pyrolysis components, immediately registering these indications of thermal decomposition or of smoulder spot development. The system detects a difference of 1 ppm. Self-ignition processes are detected as soon as they start in this way, and can be stopped effectively. Drying milk in spray towers is one important application.The probes are placed at all air inlets and outlets, continually sending air samples to the CO detection control cabinet where they are treated and filtered. The differential between the sum of inlet samples is compared with the sum of outlet samples. When the CO differential reaches one of three programmable levels, the appropriate alarm is signaled.