Laser Gas Detecting System

Model：AEP-301

Overview

The laser gas detecting system adopts the advanced and high-sensitivity technology - TDLAS (Tunable Diode Laser Absorption Spectroscopy).

The technology allows that the gas absorption condition can be analyzed through quickly modulating the laser frequency to make it pass through the measured gas absorption spectroscopy and adopting the phase-locked amplification technology to measure the harmonic component in the transmitted radiation absorbed by the gas.

The semiconductor laser passes through the light intensity attenuation of the measured gas based on the Lambert-Beer Law. That is, the measured component can absorb the specified wavelength and the absorption intensity is proportional to the component concentration. Thus, the measured gas concentration can be detected through the way that the measured gas attenuates the laser.

Technical specifications

Measuring gas:                     NH3

Measuring range:                 0-20 ppm

Resolution:                            0.1 ppm

Repeatability:                        ≤1% Full Span

Linearity:                               ≤1% Full Span

Response time:                    10 sec (including sampling)

Drift:                                      ≤±1% Full Span

Function parameters:

Preheating time:                  30 min

Digital output:                      RS 232/485

Analog output:                     4-20 mA, maximum load: 900Ω

Relay output:                        AC/DC 24V/1A

                                               concentration threshold alarm

                                               transmittance abnormity alarm

                                               laser temperature abnormity alarm

Power supply:                      AC100-240 V/47-63 Hz;3 kW

Sample gas temperature:    ≤800℃

Sample gas pressure:          Atmospheric pressure±5KPa

Sampling flow:                     2-3L/min

Ambient temperature:         -10~55℃

Ambient pressure:               70 KPa-120 KPa

Features

-High measurement accuracy – Free from background gas disturbance

-High-efficiency corrosion prevention: Extraction type of by-pass measurement – Its high-temperature heating for whole process efficiently  ensure the corrosive sample gas temperature is higher than acid dewpoint and the contact parts is free from corrosion

-No system drift, avoiding regular calibration - NH3 analyzer adopts multiple reflection and wavelength modulation spectroscopy technology  and carry out dynamic compensation and lock gas absorbing spectroscopy, free from the impact of temperature, pressure and environment  changes

Applications

The laser gas detecting system is robust and easy to install. It is especially suitable for monitoring industrial process gas emissions and applicable to a wide range of environmental protection fields including the coal-fired power, aluminum, metallurgy, waste generation, cement and petrochemical plant.