The EPM2126064 Critical Orifice Assembly (2126.064) is the critical (sonic) flow metering element used with Thermo Fisher’s EPM-300 series In-Situ Dilution Probes to deliver a precise, constant gas flow during sampling. Thermo Fisher’s documentation lists 2126.064 as a critical orifice and notes that it requires a quartz orifice with a ball-joint mounting end. In gas sampling applications, this assembly provides a stable, controlled sample flow for environmental and stack-emissions monitoring using dilution probes.
