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TITAN 2 Instrument User Manual V1.0
System Description
The Gas Detector
The Titan 2 samples the ambient air once every 60 seconds and passes the sample through a Photo-Ionisation Detector
(PID).
The PID works by illuminating sample gases with high energy ultra-violet (UV) light. Benzene is one of the volatile organic
compounds (VOCs) ionised by the UV photons. In a high voltage electric field, these ions create a current that can be
amplified and measured to quantify the concentration of gases present. To make the measurements specific to benzene,
it must be separated out from the other gasses before the PID measurement. Titan 2 incorporates the MiniPID T2, this
sensor is humidity resistant and has an anti contamination design.
The sample passes through the AirSep filter which retards some gas components more than others. Under controlled
conditions the filtration ensures the benzene will pass through the filter at a known and well defined time as a separated
component. The benzene level is measured by analysis of the signal profile of the PID as the gasses from the AirSep filter
pass through it.
For optimum performance it is important that the filter temperature and sample flow are tightly controlled. To achieve
temperature stability, the AirSep filter is controlled to 50degC and the internal air temperature of the Titan 2 is controlled
to a maximum of 50degC by separate heating systems.
There is no forced cooling mechanism so if the ambient temperature exceeds 55degC the measurement of benzene will
be lower than the actual concentration.
Make sure to install the Titan 2 where the ambient temperature does not rise above 55degC.
Pneumatic Connections
The Titan 2 has three flame-arrestor connectors: one inlet and one outlet for the sampled air, and one breather. The
breather keeps pressure equilibrium between inside and outside of the housing.
The outlet flame-arrestor can have an exhaust tube attached, to remove the processed air away from the inlet.
Internally, there is also an inlet through the carbon filter and an outlet into the interior space.
Note: Ensure you connect the inlet and outlet tubing to the right ports on the module.
P
eering Gas Sensing Technology.
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