Data acquisition and handling system

What is a Data Acquisition and Handling System (DAHS)? The DAHS then uses the digital data, analyses, and checks measured levels of substances recorded

How does a DAQ card work?

DAQ cards often contain multiple components (multiplexer, ADC, DAC, TTL-IO, high-speed timers, RAM).
These are accessible via a bus by a microcontroller, which can run small programs.
A controller is more flexible than a hard-wired logic, yet cheaper than a CPU so it is permissible to block it with simple polling loops.

What is a data acquisition system?

Data acquisition is the process of sampling signals that measure real-world physical conditions and converting the resulting samples into digital numeric values that can be manipulated by a computer.
Data acquisition systems, abbreviated by the acronyms DAS, DAQ, or DAU, typically convert analog waveforms into digital values for processing.

What is DAQ hardware?

DAQ hardware is what usually interfaces between the signal and a PC.
It could be in the form of modules that can be connected to the computer's ports ( parallel, serial, USB, etc.) or cards connected to slots ( S-100 bus, AppleBus, ISA, MCA, PCI, PCI-E, etc.) in a PC motherboard or in a modular crate ( CAMAC, NIM, VME ).

What programming languages are used for data acquisition?

Data acquisition applications are usually controlled by software programs developed using various general purpose programming languages such as:

Assembly
BASIC
C
C++
C#
Fortran
Java
LabVIEW
Lisp
Pascal
etc

Stand-alone data acquisition systems are often called data loggers .

Tool to monitor the effluent gas streams resulting from combustion in industrial processe

Continuous emission monitoring systems (CEMS) are used as a tool to monitor the effluent gas streams resulting from combustion in industrial processes.
CEMS can measure flue gas for oxygen, carbon monoxide and carbon dioxide to provide information for combustion control in industrial settings.
They are also used as a means to comply with air emission standards such as the United States Environmental Protection Agency's (EPA) Acid Rain Program, other US federal emission programs, or state permitted emission standards.
CEMS typically consist of analyzers to measure gas concentrations within the stream, equipment to direct a sample of that gas stream to the analyzers if they are remote, equipment to condition the sample gas by removing water and other components that could interfere with the reading, pneumatic plumbing with valves that can be controlled by a PLC to route the sample gas to and away from the analyzers, a calibration and maintenance system that allows for the injection of calibration gases into the sample line, and a Data Acquisition and Handling System (DAHS) that collects and stores each data point and can perform necessary calculations required to get total mass emissions.
A CEMS operates at all times even if the process it measures is not on.
They can continuously collect, record and report emissions data for process monitoring and/or for compliance purposes.