Sampling Criteria

Accurate readings are only possible if the sample is taken from a clean (free of excess carbon buildup) sample port.  The current state-of-the-art technology associated with infrared gas detection requires that a clean, soot free sample be available for analysis.  This will also increase the life of the filter elements, and reduce the possibility that soot will enter the unit and contaminate the sensors.

 

On a furnace, the ideal port would be found on SSi’s Sample Port (Part Number 20263).  If this were not available, the burnout port of a freshly burned-out Gold ProbeÔ would be an alternative, although this would still contain a trace amount of soot.

 

On a generator, a dedicated sample port should be available.  This sample port should be blown out before it is used, which will remove any soot that has accumulated in the line. This is accomplished by opening the valve without connecting the analyzer.  Wait until the gas stream is clean before proceeding, and connect the sample line on the PGA3500 to the sample port.

 

The ideal flow rate for sampling should be between 1.0 and 1.5 Standard Cubic Feet per Hour (SCFH).  A visual indication of flow rate can be obtained through the mini flow meter located on the inside of the lid of the case, or by the digital flow meter on the left side of the display.  The flow meter on the inside of the case also contains a dial that allows the user to restrict the flow, if necessary, to maintain an appropriate flow rate.  If the sample gas is not under pressure, the internal pump can be used to extract it.  The internal pump can be operated manually by pressing the circular arrow key, or it can be turned on or off automatically when it detects low sample flow.