Gas sampler

Our recirculating sampling systems use a pneumatically operated pump to first create suction to draw the sample, which could be highly corrosive liquor, up a dip tube mounted on the vessel lid into the system then to pump it around the system, before discharging it back into the vessel. The sampler can be run for several seconds beforehand to ensure that there is a representative sample passing through the system before a sample is taken. Once a sample has been obtained, the inlet isolation valve is closed and gas such as nitrogen is introduced into the system to purge the system clear ready for the next use. A wash liquor can also be used and pumped around the system and discharged into the vessel if required. Choice of mounting position Discharge from the pump back into the vessel can be to a separate nozzle or to the same nozzle and is connected via an instrument tee that sits underneath the dip pipe. This allows the return liquor to fall back into the vessel around the outside of the dip pipe whilst fresh sample liquor is drawn up the bore of the dip pipe from the submerged end. The discharge to the vessel can be through a PTFE hose assembly or hard piped using our HiPerFlon lined piping. Choose from a variety of pumps There is a wide choice of pumps available and we typically try to follow the customers site standard. Double diaphragm pumps machined from solid PTFE blocks are suitable for use up to 212° F, beyond that we supply our sampling systems with a tubular diaphragm pump which can be used in processes up to 356°F.