FGDS-ASP1000 & ASP2000 Aspirating Detection SyStems
Smoke & Gas Aspirating Sample Systems
Aspirator Systems
Aspirator systems are used to detect Flammable Gas, Toxic Gas & Smoke in applications which are not suitable for point detection.
FGDS manufacture gas aspirator systems for use in hazardous areas and provide custom built solutions for a wide variety of applications including offshore oil and gas, petrochemical, chemical, and refining industries.
Our aspirators are engineered to allow ease of maintenance and utilise whenever possible standard components, these systems can be supplied with any manufacturer’s gas or smoke detector, fully certified and constructed in accordance with ATEX regulations.
Two models are avaliable:
FGDS-ASP1000 - Aspirating Detection system with air driven venturi pump.
FGDS-ASP2000 - Aspirating Detection system with Zone 1 electric diaphragm pump.
Application
Aspirators (sampling systems) provide a solution to the complex problem of accurately monitoring gas and/or smoke ingress into areas where it is not practical, possible or safe to position a detector directly, and even where there is no instrument air.
FGDS Aspirator Systems can be used with any manufacturer’s gas or smoke detection products. Each aspirator cabinet is custom built using our own design “Aspirating Block” and other standard component parts.
Combustible and toxic gas as well as smoke detectors can be mixed in one cabinet.
Self-Compensating Duct Probes can be supplied providing an accurate representation of any duct being monitored.
Aspirator System Principle
The Aspirator systems are made from components engineered by FGDS to meet the requirements of the application to proven specifications.
The systems can accommodate Flammable, Toxic/Oxygen Gas Detectors and smoke detector all on a single loop.
Self-compensation and back purgeable Duct Probes are supplied to withdraw an accurate sample of the target gas to be monitored.
The sample being measured is pulled under a vacuum created by an air driven pump (eductor) or ATEX certified electric pump.
Flow rates are controlled by an integral needle valve with the velocity being indicated on a flow meter.
The sample is passed across the sensor and then exhausted, along with instrument air, via the exhaust port.
Sample lines can be cleared by pressing the line purge button, diverting instrument air down the sample line.
Calibration of the gas sensor is carried out via a failsafe valve and a quick connect coupling.
SPECIFICATIONS FGDS-ASP1000:
Instrument Air Pressure: 15-150psi
Regulator: 0-4 Bar
Instrument Air Consumption: 1.0LPM/Channel at 100psig
Response Time: 0.25 to 0.75 sec/m of sample line, depending on detector type.
Cabinet Material: Stainless Steel or GRP
SPECIFICATIONS FGDS-ASP2000:
Approval: Ex II 2G Ex de IIC T4i
Voltage: 110/115 Vac 50/60Hz or 240Vac 50Hz
Response Time: 0.25 to 0.75 sec/m of sample line, depending on detector type.
Cabinet Material: Stainless Steel or GRP
FGDS-SCDP1000 Self-Compensating Duct Probe
Application
The FGDS Self Compensating Duct Probe (SCDP) has been designed to allow simple, trouble free, representative sampling of duct environments. When used in conjunction with a FGDS ASP1000 or ASP2000 aspirator it provides a complete duct sampling system capable of operating in hazardous areas.
The SCDP draws a representative sample from the whole width of a duct, no matter what the flow rate or pressure in the duct. The design ensures equal volumes of sample are drawn from each duct sampling point, before combining them prior to introduction to an aspirator.
The SCDP operates on the "reverse wing" principle, the contour of the SCDP creates an area of negative pressure on the opposite side to the airflow direction. The samples are drawn from this area behind the probe protecting the sample holes from becoming blocked by particulate in the duct.
Large particles carried by the flow in the duct, which may block sampling points of traditional probes, will either be too heavy to be drawn into the negative pressure area, or will impact on the face of the SCDP. In either case the SCDP sampling holes will remain unaffected
Technical Details
Construction - All external surfaces are 316 stainless steel. Internal components are either PTFE or Delryn which are resistant to attack by corrosive gases, Hydrogen Sulphide for example.
If required neoprene sealing gaskets and Delryn isolation sleeves can be provided to isolate the SCDP from the duct wall. Dimensions - Each SCDP is manufactured to fit exactly into a customer’s duct. Maximum length 4m.