Environmental

Monitoring

The method defines the result

Sample Delivery & Conditioning Systems

The most important component to realtime gas monitoring when sampling from a point source is the gas Preparation and delivery system.

This can be looked at in a number of simple ways

  • Dust removal
  • Temperature stabilisation
  • Moisture removal

Dust Removal

The simplest mechanism is an unheated sintered frit fixed to a steel tube. The next mechanism which Involves a probe is the unheated probe with a heated filter at the back of it.

PSP 4000

The psp 4000 heated filter
Has a screw on probe attachment
A heated line will connect directly into it.

Heated lines are then used to convey the sample in its gaseous state to either a heated analyser where it is measured in its gaseous state, accounting for the associated water vapour. Or the sample is passed through a a gas conditioner. The conditioner removes the sample in such a way so a to make minimum impact on the sample.

Heated Lines

Comes in various lengths from 1m generally up to 30m as useable systems for conveying a hot wet gas sample( with dust removed initially by filtration via the probe). The heated lines may also require a calibration line for probe tip calibrations. It may also be desirable to have removeable sample lines. These can be changed if they become contaminated. Finally it is also important to look at the type of controller to be used with a heated line (i.e a controller With a pid controller which can display the actual temperature and set point).

Heated Lines

A gas conditioner is either compressor cooled or peltier cooled. The operational temperature of these units is nominally 4 deg C to comply with Mcerts requirements. The gas stream is cooled rapidly to quickly remove the moisture from the stream. The dry stream is passed to the analyser. The moisture is drained via a peristaltic pump. N.B please note the ambient temp of the "dry stream" when using the kit outside on cold days or in cold environments.

PSS 5