Last week we talked about reading error, this week let's continue our discussion comparing the use of Flammability (FTA) Analyzers and Flame Ionization (FID) Detectors in process applications, with sample accuracy.
Process atmospheres are typically heated to high temperatures. If any portion of the sample is lost in the sample delivery system, the analyzer will read lower than actual – an unsafe condition.
In order to have the most accurate representation of your proccesses sample:
- Sample lines must be heated to avoid condensation (sample loss)
- Sample lines should be short to minimize response time
- Sample lines should be as straight as possible, to prevent clogging and sample delivery delay
Because most FIDs cannot be mounted directly onto the process, their sample lines must be longer, which creates longer sample delivery times. Often the sample lines are unheated, or not sufficiently heated, which creates sample drop loss and unsafe readings. In addition, the sample can clog in the FID capillaries, also resulting in sample loss.
A flammability analyzer is a rugged industrial instrument that mounts directly onto the process, thus allowing for the shortest, straightest sample line possible. The entire sample train is heated above the dew point of the process to prevent any portion of the sample from condensing.