Ecotech Serinus 44 - 1.3 Nomenclature and Background Theory

Introduction
Page 19
1.2.6 Physical Dimensions
Case Dimensions
Rack length (front to rear): 597 mm (23.5”)
Total length (with latch release): 638 mm (25.1”)
Chassis width: 418 mm (16.5”)
Front panel width: 429 mm (16.9”)
Chassis height: 163 mm/Uses 4RU (6.4”)
Front panel height: 175 mm (6.9”)
Weight: 23.6 kg
1.3 Nomenclature
NO:
Nitrogen oxide or nitric oxide.
NO
2
:
Nitrogen dioxide.
NO
X
:
A generic term for mono-nitrogen oxides NO and
NO
2
.
NH
3
:
Ammonia
N
X
A generic term for mono-nitrogen oxides NO and
NO
2
and Ammonia
Span:
A gas sample of known composition and
concentration used to calibrate/check the response
of the instrument.
Zero:
Zero calibration uses zero air (NO
X
/NH
3
scrubbed
ambient air) to calibrate/check the zero response of
the instrument.
Background Cycle:
Removes unwanted signal from the measurement
signal. This is accomplished by pre-reacting the
sample gas with ozone outside the reaction cell. The
pre-reacted gas is drawn into the reaction cell where
this signal is stored as the background signal. This
background measurement is used to correct the
sample measurement by subtracting the background
signal from the measurement signal. Background
cycle can be described as a dynamic zero where
unwanted signals generated from the
photomultiplier tube (detector) due to internal
offsets (dark current) or unwanted cell
luminescence’s are removed.
Multipoint Precision Check:
A procedure to verify the linearity of the instrument.
Calibration:
The process of adjusting the instrument to ensure
that it is measuring the correct concentration.