Thermo Scientific MIE ADR-1500 Instruction Manual page 80

Operation
3-30 MIE ADR-1500 Instruction Manual
The inlet type, flow rate, and respective particle cut-point (D50) are
described in "Particle Size Cut
From the Configure menu, press the
●
key to the Inlet Type screen.
INLET TYPE
BLUE CYCLONE
In the above screen, the Inlet Type is shown. By pressing
can be changed from Total to Red Cyclone or Blue Cyclone. If a cyclone is
selected, the D50 cut-point will change depending upon the flow rate
selected.
When the relative humidity correction function is enabled, the particle
growth effect due to a high humidity environment is corrected for. This
means that the computed mass concentration is based on the original dry
environment particle population. This correction only applies when mass
concentration units have been selected, but not when scattering coefficient
has been selected.
RH CORRECTION
* ENABLED
As with any light scattering device, the scattering efficiency of an aerosol
will increase with an increased relative humidity. Furthermore, the
scattering efficiency of a particle is maximized when the particle diameter is
the same as the wavelength of the incident light. In the case of the ADR-
1500 an 880 nm LED light source is used and a RH Correction has been
implemented based on data taken from multiple field evaluations. When
enabled, the ADR-1500 will normalize the response to a relative humidity
of 40% when the measured RH > 40 %. Although the RH Correction is
effective at providing a more accurate response, the connector can affect the
precision between two instruments.
Additional Configuration parameters are the Alarm setting, units of
measure, and the Analog Output settings.
ALARM DISABLED
Points" on page 4-5.
key and scroll the ▲ or ▼
ENTER
, the inlet
ENTER
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