Gas and smoke aspirator systems monitor for smoke or gas ingress where installing detectors are not feasible. These aspirator systems work by having the sample being measured by a probe pulled in to the aspirator system under an adjustable vacuum created by an air-driven educator and then measured by the gas detector.
The probes used in aspirator systems are designed for extreme environments. The system is separated from the probes taking in the samples and can be located in a place that is easy to view and maintain.
These systems are suitable for a wide range of applications including gas turbines, wastewater sewage dryers, printing plants, LNG & LPG tanker ships, floating production storage and offloading (FPSO) ballast tanks and turret moonpools, offshore oil & gas production riser caissons, and crude oil drilling areas & storage tanks—just to name a few. These applications are typically where temperatures are too extreme for field devices, particularly point infrared & electrochemical-based detectors.
The systems simple design pulls in the sample from the probe through a sample intake, runs it through the gas detector and sends out the sample through an exhaust outlet. The sampling system requires no power and has very few moving parts. The system can be calibrated while it remains inline.
Self-compensating duct probes uniformly draw gas to provide a representative sample to analyze. Josh highlighted the use of these systems in gas turbine applications. Even with the high heat in the ventilation exhaust ducts, the probes can operate reliably over time. Instead of sending personnel into these hazardous areas to periodically sample gas levels, the aspirator systems can continuously sample these areas.
The gas detectors performing the analysis can come from a range of suppliers including Emerson’s toxic and combustible gas detectors.
Visit the Flame and Gas Detection section on Emerson.com for more on the aspirator systems and detectors. You can also connect and interact with other analyzer experts in the Measurement Instrumentation group in the Emerson Exchange 365 community.