Section 1 Flashcards
Analyzer classifications based on operation:
Chemical analysis (quantitative, and qualitative), and physical property
Analyzer classifications based on application:
Process analyzers, and compliance analyzers (safety, and environmental)
Analyzer technologies
Electromagnetic radiation, chemical affinity or reactivity, electric or magnetic fields, thermal or mechanical energy
Online analyzer
(MUST BE ALL THREE)
1. Be connected to the process to obtain a sample
2. actively measuring
3. actively sending data
Offline analyzer
Fails to satisfy one (or more) of the three online conditions
Sensor locations
- In-situ (sensor is in the process)
- At-line (sensor is beside the process)
- Distant from line (sensor is 50m+ from the process line)
Considerations for analyzer selection
Application (type, process, etc.), location (installation, cals., maintenance), sampling
Tap locations for sampling
For gas: taps should be on the top
For liquid: taps should be on the side
Sample Standard Method (calibration)
Analyzer is taken offline, sample with known concentrations is used to calibrate the analyzer (zero, span fluids)
Paired Sample Method (calibration)
Using another analyzer to compare readings with similar (ideally identical) samples from the same process/source
Absolute Standardization Method (calibration)
Analyzer simulates the properties of a zero and span sample and makes a calibration` adjustment
Ideal Zero gas
Contains all the same substances that are expected in the process but devoid of any substance that the analyzer would respond to.
Ideal span gas
Contains all the same substances that are expected in the process but all components and concentrates are known exactly
Examples of gas mixtures:
bump gas, cylinders, ampules
Ways to make gas mixtures:
Permeation tubes, using rotameters