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Tomball, TX 77375

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MEMBRANE PROBE™ SAMPLE TRANSFER UNIT
Measure Hydrocarbons, H₂S, SO₂, Alcohols, Olefins, Etc.
Dissolved in Liquids or Gas Streams

SAMPLE PREPARATION PRINCIPLE:

A process stream, liquid, gas or stack gas, contacts a permeable membrane which is protected by a baffle plate and screened opening. The gases and vapors migrate through the permeation membrane into a clean carrier gas on the opposite side of the membrane. The resulting analyzer sample contains no mists, liquids, particulate or salts. This clean, relatively dry sample is ideal for low analyzer maintenance.

Measurement of volatile hydrocarbons below 10 PPBw is practical. Lower detection limit is usually dependent on the purity of carrier gas, N₂, helium, air, etc.

ANALYZER TYPES

Chromatograph
The clean carrier gas containing volatiles that have permeated into the carrier gas result in low injection valve maintenance and protection of chromatograph columns.

The system's response to a given hydrocarbon in a sample is dependent on the permeation characteristics of the compound through the probe's membrane and the type of column/detector in use. Actual response is determined by exposing the probe to a standard prepared from the hydrocarbon during calibration of the system.

Mass Spectrometer
Sample introduction into the instrument vacuum system is simplified. Contaminants are blocked providing low maintenance. Only enough gas needs to be used to sweep the flow system in a short time, increasing sensitivity.

ECONOMICAL SOLID STATE SENSOR

A solid state sensor mounted in the system can provide a direct digital measure of volatile hydrocarbon in water samples to inexpensively monitor for heat exchanger leaks. Although it does not identify the compound, this is not needed when the process stream is known. An optional linearizer will provide direct PPM readout.

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| Membrane Transfer Technology | TNRCC Letter |

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Keco R&D Inc.
 

Patent # 5,156,334 and Patent Pending
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