Technical Manual
Page 1
CODEL
OPS.109
Issue : B
Rev. : 1
Date : 23/10/13
Doc. i/d : 0109/6
Ref. : 090028
1. Overview of the CODEL Model V-CEM5100 Flow Monitor
This instrument is fitted with lenses of Germanium, a naturally occurring semi-metallic element that may
be harmful if the lens is broken and the dust inhaled.
1.1. Introduction
Correcting measurements to standard temperature, oxygen levels, etc., allows the density of emissions to be
normalised (e.g. mg/Nm
3
), but in order to obtain a measurement of total emissions for pollution monitoring (e.g.
kg/hr), it is necessary to measure flow.
Many methods require direct contact with the hot dirty gases resulting in high maintenance costs and potential
unreliability. The CODEL Model V-CEM5100 Gas Velocity Monitor utilises an infrared cross-correlation
technique that requires no contact with the flue gases.
The method used resembles flow measurement with chemical dye or radioactive tracers, where the velocity is
derived from the transport time of the tracer between two measuring points a known distance apart. However,
instead of an artificial tracer being added, the naturally occurring fluctuations of the infrared energy in the gas
stream are used as the tracer.
Fully purged transducers with no moving components make the system highly reliable and minimise
maintenance requirements. This stand-alone instrument is ideally suited to monitoring the flow rate of hot, dirty
gases.
The instrument is illustrated in Figure 1.
Figure 1 : General Arrangement of the V-CEM5100
Rx1
(Ch A)
Rx2
(Ch B)