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NEW GENERATION OF TDLAS GAS
MONITORS FROM NORWAY
Formation of new NEO subsidiary dedicated to the
supply of laser-based gas monitors
NEO Monitors AS is a new subsidiary of
Norsk Elektro Optikk AS (NEO), which has been formed to take over the
manufacture, marketing and service of the laser-based gas and dust monitors
using tuneable diode laser (TDLAS) technology that were formerly supplied by
NEO. NEO is one of Norway's principal research companies in the electro-optics
field, working with industrial partners and with research institutes on
national and international projects.
Unlike conventional UV or IR
spectrographic instruments, NEO Monitors' instruments employ the measurement
principle known as 'single line spectroscopy', which eliminates cross
interference from other gases and enables very low concentrations of gas to be
detected. The company is currently the largest commercial supplier of TDLAS gas
monitors for industrial applications. More than 1000 such NEO monitors are
currently operating in over 30 countries.
New compact,
high-performance model
The first new product to be launched by NEO
Monitors is the LaserGas II (see photograph) which has applications in emission
monitoring and process control across a wide range of industrial applications
e.g. in steel, aluminium and other non-ferrous metal, chemical, petroleum and
cement production, power generation and waste incineration.
Designed
for continuous in-situ monitoring, LaserGas models offer high sensitivity -
detecting in the ppb and low ppm ranges. Response time is less than 2 seconds.
All LaserGas instruments can be supplied as stack, open path or dual path
configurations. The range includes models for detecting O2, HCl, HF, NH3, CO,
CO2 H2O, H2S, HCN, NO, N2O, CH4 and other hydrocarbons, as well as for
detecting two different gases or a gas and temperature simultaneously using a
single laser.
The LaserGas II model comprises only two basic
components: transmitter and receiver, each of which includes air-purging and
alignment mechanisms as well as the appropriate electronics. All LaserGas
models operate over the range 2-3 bar maximum pressure and temperatures up to
500ºC, but it is possible to operate at up to 20 bar and 1500ºC with
some gases.
More new features
An important new feature
included in LaserGas II is an Ethernet connection to enable communication via
the Internet.
The LaserGas II has 3 current loop (4-20mA) inputs and
three current loop outputs. Switch-mode voltage converters have been included
to reduce power consumption. The instrument's input voltage is 18-36VDC. A
separate power supply box with input 100 - 240V, 50/60 Hz is provided.
Measurement principle
With LaserGas monitors, a single
gas absorption line with no interference is chosen in the near IR spectral
range. A single-mode diode laser operating at room temperature scans the single
absorption line. A detector sited opposite the laser detects the light
absorption caused by the target gas molecules, after which the gas
concentration is calculated. No compensation is required for the presence of
other gases. Automatic correction for temperature and pressure variations is
included.
Simplified maintenance and servicing
LaserGas
II monitors incorporate fault diagnostics and all the critical hardware
components are sited in field-replaceable modules. Most maintenance can
therefore be done on site, thereby increasing the availability of the
instrument. Improved self-testing on start-up and facilities for logging
system-diagnostics information are also included in LaserGas II.
There
are no moving parts and no consumables are required. Calibration intervals are
typically 6-12 months and zero drift is negligible. Purging with dry, oil-free
pressurized air or nitrogen prevents dust and other contaminants from fouling
the optical windows.
Further information from:
NEO
Monitors AS
P.O. Box 384 N-1471 Lørenskog, Norway
Tel: + 47
67974700
Fax: + 47 67974900
www.neomonitors.com
