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Title: Tdlas Operational Methodology
Author: Samuel C. Miller, Ryan Hamilton
Source: 2014 Appalachian Gas Measurement Short Course
Year Published: 2014
Abstract: Online determination of vapor phase moisture concentra - tion in natural gas using a tunable diode laser absorption spectroscopy (TDLAS) analyzer also known as a TDL analyzer. Pressure: Process stream pressures can range from 100 to 4000 psig however TDL measurement is performed at pressures near atmospheric , therefore pressure reduc - tion is typically required. The vent line (outlet) of a TDL analyzer is tolerant to small pressure changes on the or - der of 50-100 mbar (1-2 psi) but it is important to observe the manufacturers published pressure constraints. Large spikes or steps in backpressure may affect the analyzer readings.

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