ABB LS4000 diode laser analyzer

ABB LS4000 diode laser analyzer

Product Overview

The ABB LS4000 diode laser analyzer is an in-situ cross cut gas concentration measurement device based on tunable diode laser absorption spectroscopy (TDLAS) technology. Its core advantages are “high precision, resistance to harsh working conditions, fast response, and safety and convenience”. It is suitable for direct measurement of hazardous gas flows and is widely used in industrial scenarios that require precise monitoring of NH3 and H2O concentrations. The product complies with the IEC 61207-1:2010 standard (gas analyzer performance representation) and has passed multiple international safety certifications to ensure measurement reliability and equipment safety.

Core Technology and Measurement Principles

Measurement principle: Utilizing the characteristic of “specific gas absorbing specific wavelength laser”, the tunable laser diode in the transmitter emits laser, and the laser is received by the photodetector of the receiver after passing through the process gas; The measured gas absorbs laser and causes light intensity attenuation. The system calculates the gas concentration through a complex signal algorithm combined with the Beer Lambert law, and eliminates the influence of temperature and pressure changes on the measurement results through dynamic automatic correction (requiring 4-20mA input support for correction).

Key technical features:

High selectivity: Under normal operating conditions, there is no cross interference and it is only sensitive to the target gases (NH ∝, H ₂ O);

In situ measurement: No need for sample transmission or pretreatment, avoiding errors caused by sample loss/deterioration;

Anti interference: insensitive to vibration, suitable for complex industrial environments.

Detailed technical specifications

1. Measurement parameters and range

Minimum/maximum measurement range for measuring components, maximum absolute pressure, maximum temperature, optical path length (OPL)

NH₃ 0-10 ~ 0-1000 ppm 0.5-1.7 bar（7-24 psi） 450°C（842°F） 0.5-5 m（1.6-16.4 ft）

H₂O 0-10 ~ 0-50 vol.-% 0.5-1.7 bar（7-24 psi） 450°C（842°F） 0.5-5 m（1.6-16.4 ft）

NH ∝+H ₂ O and NH ∝, H ₂ O can be measured separately within a range of 0.5-1.7 bar (7-24 psi) at 450 ° C (842 ° F) and 0.5-5 m (1.6-16.4 ft)

Note: All specifications are based on 1m OPL measured in ABB testing calibration fixtures. The actual detection limit and range need to be adjusted according to gas conditions (temperature/pressure/composition) and OPL, and the minimum range, maximum pressure, and maximum temperature cannot be achieved simultaneously under all conditions.

2. Performance stability

Performance indicators NH ∝, NH ∝+H ₂ O (under standard conditions) Remarks

Linear deviation ≤ 1% of span. Span refers to the maximum difference in measurement range

Repeatability<2% of reading: Consistency of multiple measurement results

Negligible zero drift: Reading stability without target gas

Span drift not specified-

Output fluctuation (2 σ) ≤ 1% of the fluctuation within the statistical standard deviation range of the minimum measurement range

Detection limit (4 σ) ≤ 2% of the minimum concentration that can be reliably detected within the minimum measurement range

3. Environmental and process impacts

Influencing factors NH ∝, NH ∝+H ₂ O H ₂ O Response measures

Process temperature<3% of measured value<3% of measured value dynamic automatic correction (temperature and pressure input required)

Process pressure<2% of reading/30 hPa<4.5% of reading/30 hPa dynamic automatic correction (temperature and pressure input required)

When the dust load transmission loss is less than 97%, the equipment can still operate. If necessary, use an insertion tube to shorten the OPL

No cross interference with accompanying gas (normal operating conditions) No cross interference (normal operating conditions)-

The airflow velocity does not affect the measurement and determines the amount of gas required for process blowing

Environmental temperature (operating) transmitter/receiver/junction box: -20~+55 ° C (no direct sunlight). Exceeding the range may affect performance

System composition and structure

1. Core component specifications

Component material, weight, protection level, color, key functions

Transmitter unit stainless steel AISI 304H (1.4308, painted) 4.1 kg IP65 light gray (RAL 7035) emits tunable laser

Receiver unit stainless steel AISI 304H (1.4308, painted) 4.1 kg IP65 light gray (RAL 7035) receives laser and converts it into electrical signal

Universal junction box painted steel 4.7 kg IP65 light gray (RAL 7035) for connecting transmitter/receiver, can integrate power supply

2. Flanges and Blowing

Flange specifications: Standard sizes are DN 50/PN 10, ANSI 2 in. -150 lb, JIS 10K 50A; The material standard is AISI 304 (1.4301), and AISI 316L (1.4404) is optional;

Blowing requirements: The process side needs to be blown (instrument casing does not need to be blown), and the blowing medium is dry oil-free instrument air (in accordance with ISO 8573.1 Class 2-3) or nitrogen;

Blowing interface: 1/4 in. Swagelok ®  Connector, compatible with pipes with an outer diameter of 8mm.

Electrical interface and power supply

1. Electrical connection

Terminal number signal type function description

12 AO1 (4-20 mA) analog output 1 (corresponding to 1 measurement component)

13 AO2 (4-20 mA) analog output 2 (corresponding to 1 measurement component)

14 AO3 (4-20 mA) analog output 3 (corresponding to transmission value)

15 AO GND analog output ground

16-17 DO1_A/DO1_B digital output 1 (for fault/gas alarm)

18-19 DO2RA/DO2RB digital output 2 (for fault/gas alarm)

27-28 T probe in/out temperature correction analog input (4-20 mA)

29-30 P probe in/out pressure correction analog input (4-20 mA)

-Ethernet service port (for device debugging/data transmission)

2. Power parameters

Power type Input voltage range Output voltage Power consumption

No integrated power supply DC 24V (nominal, 18-32V) -<10 W

Integrated power supply (inside junction box) AC 100-240V (± 10%, 50-60 Hz) DC 24V 30 VA

Installation and maintenance

1. Installation requirements

Installation position: The gas at the measurement point needs to be fully mixed (to avoid layering and errors), and the transmitter and receiver should be installed facing each other on both sides of the process pipeline/chimney;

Alignment tolerance: flange parallelism error ≤ 1.5 °;

Storage/transportation temperature: transmitter/receiver unit: -40~+70 ° C.

2. Maintenance and Calibration

Maintenance interval: There is no fixed cycle, depending on the application scenario (such as gas corrosiveness) and dust load;

Calibration method: Single point calibration is adopted, which requires the cooperation of testing gas and external offline calibration pool (accessories);

Calibration/validation cycle: usually once a year (adjusted according to application);

Accessory support: Calibration tank (made of aluminum/AISI 316L material), Verification tank (AISI 316L, permanently installed), Isolation flange (pressure resistance ≤ 16 bar, temperature resistance ≤ 300 ° C), Insertion tube (1m long, AISI 316L， Used in high dust scenarios.

Certification and Compliance

CE certification: compliant with the 2014/35/EU Low Voltage Directive (EN 61010-1:2010) and the 2014/30/EU EMC Directive (EN 61326-1:2013);

IECEE CB certification: compliant with IEC 61010-1 (3rd edition), certificate number DE1-52306;

UL/CSA certification: Compliant with CAN/CSA-C22.2 No.61010-1-12, UL 61010-1 (3rd edition), certificate number 70001037.