SAMPLING LINE | PSG Extruded SR

The self-regulating heated sample lines of the PSG Extruded SR series are used for continuous analysis of extractive gases. They are primarily used to transport the wet sample gas stream from the sampling point to the analyzer's home. The maintenance temperature of the line must therefore be higher than the water vapor resp. acid dew point of the sample gas. In this way, the uncontrolled condensation of the water vapor on the way to the analyzer and therefore the washing of the gas components in the condensate is prevented. Failure of the measurement by a freezing line at ambient temperatures below 0 ° C is also avoided.
 
Heavy-duty lines with thick-walled, flame-retardant extruded TPU, PE or PVC outer sheath are fitted with a high-quality self-regulating Raychem® heating cable. Insulation is done with thermal fleece or fiberglass. Depending on the heating cable used, holding temperatures of up to 150 ° C to -20 ° C can be achieved. Solutions down to -52 ° C are also possible. Standard holding temperatures of 30 ° C, 100 ° C and 120 ° C are offered. Up to 12 PTFE, PFA, stainless steel or special alloy tubes as internal line and also interchangeable internal tubes are available.
 
Due to the self-regulating heating cable for operation, an additional temperature controller is not required. The heating cable consists of two power conductors arranged in parallel connected to an electrically conductive polymer plastic. During operation, the conductivity of the plastic decreases with increasing temperature due to molecular expansion until the specific maximum temperature of the heating cable is reached. When the temperature of the heating cable now drops, the process is reversed.