membrane sample transfer

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Keco R&D Inc.
1400 B Graham Drive
Tomball, TX 77375

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MEMBRANE SAMPLE TRANSFER
Analyzer Calibration System for Liquid or Gas Streams

Click here for diagram.

THERE IS A UNIQUE WAY TO USE GAS ANALYZERS TO MEASURE LIQUID PROCESS STREAMS

A new type of permeation tube system is gaining wide acceptance as a dependable method of calibrating analyzers and chromatographs. The KECO calibrator, built into an instrument, provides instant analyzer verification of span. This ensures confidence of process and instrument personnel. Typical applications include H₂S in fuel gas to boilers, sulfur plant tail gas analysis, H₂S in a benzene stream, etc.

For the first time it is possible to isolate sample from the analyzer sensing element with a sample transfer unit. For high PPM sample streams, the Ranger™ sample transfer unit, which operates on the permeation principal, will replace flow meter or microliter valve dilution methods. This sample transfer through a permeable membrane allows H₂S or other gas to be measured and to transfer into a clean-flowing carrier gas stream. The sample transfer unit operates equally well with a gas or liquid sample stream. Chromatograph columns are protected.

OPERATION

The system includes an input valve position labeled "Measure" to bypass the stream scrubber. The "Scrub" position provides a blank for analyzer zero. The output valve positions are labeled "Standby", which causes the permeation tube output to go to the permeation tube scrubber and the sample to go the analyzer, and "Span", which connects the permeation tube into the sample stream to span the analyzer.

Normal procedure is to check analyzer zero with the input valve in "Scrub" position. Next, the output valve is turned to "Calibrate" to check the instrument span. Initially, the analyzer reads up scale. Then, after one minute, stabilizes at a given PPM at a specified sample flow.

The stream being analyzed may be a gas or a liquid sample. Permeation through the membrane allows passage of trace gas, such as hydrogen sulfide and volatile hydrocarbon vapors, but will block liquid stream.

The permeation tube lasts one year and then is replaced. Temperature coefficient is 2%ºC. Built in permeation calibrators are convenient, accurate and require no servicing for one year. To minimize maintenance problems, all analyzers should be equipped with internal calibrators.

OPTIONS

Thermostated permeation tube
Nema 4X enclosures
Explosion proof electronics
Automatic calibration timer
Drop in place housings and analyzers

Phone: 281-516-3950 Fax: 281-351-8925
E-Mail: Sales@AsiWebPage.com
Keco R&D Inc.