Process Analyzers are instruments meant for determining the chemical composition of the substances involved in a chemical process directly, or for measuring the physical parameters indicative of composition. They are integral parts of the process control loop. The purpose of process analytical method is to supplement the control scheme of a chemical, pharmaceutical or agricultural manufacturing process with data from a process analyzer that directly measures chemical or physical attributes of the sample. The analyzers are microprocessor controlled and have constant internal diagnostics operating on the instrument. They are also able to collect data directly from the process stream itself without the need for a sample-handling system.