Which Gases To Measure - Kahn S4000 Integrale Installation, Operation And Maintenance Manual

4000 integrale series precision dewpoint hygrometer

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Table of Contents

Try to avoid too many "T" pieces or unnecessary tubing. Where possible,

build up the sampling pipe specifically for the job and do not use tubing

previously installed for another application. Dead space in sample lines

increases response time by holding water molecules which are more slowly

released to the passing gas sample.

Remove any particulate matter or oil from the gas sample.

Particulates entering the sensor measurement chamber will cause

contamination of the sensitive optical components, this will result in the

need for more frequent cleaning of the sensor optics. If particulates such as

desiccant dust or rust are possible, use a particulate in-line filter. Kahn

instruments' technical sales staff will be pleased to give advice.

Use high quality fittings.

We recommend that, wherever possible, stainless steel tubing and fittings

be used. This is particularly important at low dewpoints since other

materials have hygroscopic characteristics and absorb moisture in the pipe

walls. Absorbed moisture will slow down measurement response and, in

extreme circumstances, give false dewpoint readings.

For temporary applications, or where stainless steel tubing is not feasible,

use

high

characteristics to stainless steel.

Always use the shortest run of tubing possible between two points. Use the

smallest diameter tubing possible to reduce response time. However, take

care not to induce pressure differentials by aiming for too high a flow-rate

through small diameter tubing. A sample flow-rate between 50 and 200

/min. (0.05 and 0.2 l/min.) will be satisfactory for the Series 4000

Integrale

4.3