AMI has developed a reliable and compact Sample Pump Module that addresses a wide range of previously impossible vacuum applications.

One unique aspect of our breakthrough pump module is that it uses a very specialized diaphragm that diffuses less than 0.5ppm of oxygen while drawing from pressures as low as 14"Hg. This allows the operator to draw from a partial vacuum and then push the sample gas through the trace oxygen analyzer, allowing the sensor in the analyzer to operate at atmospheric pressure. Electrochemical oxygen sensors must operate at or very close to atmospheric pressure for accurate and stable operation.

Prior sample pump technologies used various types of diaphragm materials, which either allowed too much oxygen to diffuse, or alternatively developed small leaks allowing air to be drawn into the system. In either case, the measured trace oxygen values would be misleadingly high.

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Historically vacuum applications were limited to positioning pump or eductors downstream of the trace oxygen analyzer. This would draw sample gas through the analyzer then through the pump and exhaust it under pressure to the atmosphere. This of course directly exposes the oxygen sensor to the varying negative pressures at which the pipeline or application operates, causing erroneously low readings, drift and sensor damage.

The AMI permanent Sample Pump Module incorporates a 12VDC long life brushless motor and pump designed to last for over 20,000 continuous hours and incorporates state-of-the-art electronics that meet the safety requirements of Class 1, Div. 2 Group C and D.

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The pump is capable of handling a wide range of inlet pressures from 14"Hg. to +10psig. while maintaining a constant 10psig output pressure. Lastly we use a check valve between the inlet and outlet of the pump to prevent diaphragm damage in the event the inlet or outlet ports become restricted