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Delta F Moisture Sensor Technology
Delta F moisture analyzers (the Delta
F 700 Series) use Tunable Diode Laser Absorption Spectroscopy (TDLAS)
technology to measure moisture in gases. TDLAS is a spectroscopic
technique that uses a diode laser as its light source. TDLAS has
advantages over other techniques because the moisture sample only
comes in contact with a few optical components that are made from
very robust materials. It works according to the fundamental principle
of Beer's law; therefore the reading is stable over time and does
not ever require calibration. Other benefits include:
- Drift free operation -
self-correcting optics and laser line locking onto the water peak
removes all possibility of significant drift
- High accuracy/low maintenance
- no field span recalibration required
- Unparalleled performance
- spectroscopy allows sub-ppb level readings instantly - no lengthy
adsorption and desorption times
- Increased capabilities
- when packaged with our NanoTrace II Oxygen Analyzer you can
make both oxygen and moisture measurements from a single unitWith
the TDLAS technology moisture sensor
Delta F moisture analyzers can deliver unparalleled performance:
- 0.1 ppb sensitivity
- 0.2 ppb LDL
- Operating range: 0.00 ppb to 10.00 ppm (linear)
- Ambient range: 10-40 degrees C
- Fast response and clean up
Tunable Diode Laser Absorption Spectroscopy (TDLAS)
Beer's Law is:
I is the measurement of beam intensity when tuned
to the absorbing wavelength of moisture
Iš is the reference measurement or beam intensity when tuned away
from the moisture absorbing wavelength
S is the fundamental absorption line strength and is a fixed constant
L is the path length of the beam through the sample and is a fixed
constant
N is the number of water molecules contained in the beam path passing
through the sample
Other spectroscopic techniques that follow Beer's Law take the reference
measurement, Iš, by sending the light beam through a different optical
path and generally, utilize a second detector. By rapidly
tuning the laser, Delta F's TDLAS technology uses a single light
source, a single light path and a single detector and, therefore,
does not require any recalibration.
In spectroscopy, a longer path length is one way to achieve more
sensitivity. Inside the Herriott Cell, the laser is reflected
back and forth numerous times by mirrors inside the measuring cell.
By making multiple passes, this increases the laser path length
to achieve extremely high sensitivity. Delta F's TDLAS technology
offers a robust and simple optical design with the sample and reference
measured with a single laser source and a single detector.
As always our moisture analyzers
with TDLAS technology are shipped ready to run. The Delta F commitment
to quality runs through our entire operation - from ISO controlled
R&D, manufacturing and support to service. Our TDLAS moisture
analyzers are designed and built to provide years of trouble-free,
reliable operation.
Click Moisture
Sensing Technology and Products for more information on the
technology or click Moisture
Applications and Articles to see how this TDLAS moisture technology
can help your process.
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