Products > Environment > Emission > NH3, HCL, HF, H2S

Measuring principle

菱形图标.pngNo Cross Interference

By utilizing the ‘Single-line’ spectroscopy, a well-targeted laser spectrum can be sorted out to cover only the measuring gas without overlapping spectrum of all background gases.


菱形图标.pngNo Effects from Dust and Window Contamination

TDLAS gas analyzers use a laser spectral scanning technique. The unit periodically scans the gas under test with a modulation frequency range larger than the gas absorption spectral line-width such that, within one scan period, there are two distinctive areas Tgd and Td. The transmittance of the gas under test is then calculated accurately by Tg=Tgd/Td. The interference from dust and optical window contamination is, therefore, automatically screened out.


菱形图标.pngAutomatic Temperature & Pressure Compensation

By having 4-20mA process temperature and pressure input, the LGA system automatically compensates for them with a proprietary   algorithm to ensure measurement accuracy.


Technology Comparison

ItemLGA Laser SystemConventional  Online   Analysis
AdaptabilityApplicable  to high temperature, pressure moisture, dust density and   corrosionApplicable  to constant temperature, pressure and dust free
MeasurementIn-situ,  continuous/real-time measurement; sample gas evacuation   freeWith  sample conditioning system, discontinuous measurement
Response timeFast,  only limited by electronics response, less than 1secSlow,  limited by gas sampling, transport, and instrument electronics    response 20+sec
AccuracyAverage  concentration along the optical path; no cross interference   from other  gas species, dust, and gas parameter fluctuationsGas  concentration at the tip of the sampling probe only, affected by   gas  influence and absorption, and leaked during gas sampling and transport;    cross interference from other gas species, dust, and gas parameter    fluctuations
ReliabilityNo  moving parts, highly reliableMany  moving parts, low reliability
Calibration & MaintenanceCalibration:  <2times/year  
Maintenance:  <2times/year
Calibration:  2-3times/month
Maintenance:  frequent
Operation costsNo  spare parts, only cost of electricityLots  of spare parts, around 20% of the equipment cost per year


Features and Benefits

菱形图标.pngCross stack, fast response <1s

菱形图标.pngNo gas sampling, no cross interference

菱形图标.pngNo zero drift, diverse optical length (0.5-20m)

菱形图标.pngReliable in all harsh conditions: high temperature & pressure, dust density, moisture and corrosion

ATEX certified



Features and Benefits

菱形图标.pngLow detection limit, no cross interference

菱形图标.pngOnline calibration, no zero drift

菱形图标.pngReliable in all harsh conditions: high temperature & pressure, dust density, moisture and corrosion

菱形图标.pngATEX certified


Technical Data

Technical   PrincipleTDLAS
Installation   typeCross    duct/Extractive
NH30.1ppm0-10ppm,    0-100%
HCL0.2ppm0-50ppm,    0-100ppm
HF0.1ppm0-10ppm,    0-1,000ppm
H2S0.1ppm0-50ppm,    0-100%
Repeatability≤  ±1%F.S.
Linearity≤  ±1%F.S.
Span drift≤  ±1%F.S./6 months
Response time(T90)<  1s
Warm-up time≤  15min
Optical path length0.5-20m
Flue gas temperaturemax.  1500℃
Flue gas pressure0.8  to 4 bar   abs.
Analog outputs2  outputs 4-20mA, max. load 750Ω, electrically isolated
Relay outputs3  outputs 24V DC/1A
Analog inputs2  inputs 4-20mA, for gas temp. & pres. compensation
CommunicationsRS485  (or Bluetooth, RS232 or GPRS )
ATEX  certifiedEx  d op is pxIIC T5 Gb