ABB AO2000-LS25 Laser analyzer

（3） Use a red laser to align the fixture with the transmitter/receiver

Alignment of transmitter unit: Remove the adapter ring, install the red laser alignment fixture, adjust to find the laser beam and move it to the center of the hole, and lock the alignment.

Receiver unit alignment: Similar to the transmitter unit alignment steps, reinstall the transmitter and receiver after completion, and check the transmission readings.

（4） Tune to achieve maximum transmission

Measure the alignment voltage with a voltmeter, adjust the adjustment screws on the transmitter and receiver sides to maximize the voltage reading, repeat until there is no further improvement, and tighten the locking screws.

（5） Connect PC

Copy the service software to the PC, connect the instrument via RS-232 or network, and set parameters such as process gas pressure, temperature, and concentration units.

Service Program

（1） Software startup

Select the connection method (serial port, modem, LAN, or demo mode), enter the IP address and port number, and start in user mode or advanced mode. The user mode interface is simplified, and the advanced mode requires a password.

（2） Measurement menu

Display parameters such as status, serial number, mode, concentration, line width, and transmission, which can be accessed through buttons to access different menus. The screen update cycle defaults to 5 seconds.

（3） Program menu

Draw Readings: Draw the measured average and instantaneous gas concentration, transmission, and spectral temperature (if applicable).

Second harmonic signal: displays the signal used to calculate gas concentration, which can be saved to a file for later analysis.

Record Reading: Record measurement data to an ASCII file with customizable sampling period, file name, and recording parameters.

View error logs: Download instrument error and warning logs, save or clear logs.

Measurement configuration: Set pressure and temperature input methods, optical path parameters, concentration averaging, instrument time, etc.

Gas specific parameters: select the measured gas, unit, output format, alarm level, etc.

Calibration instrument: There are two modes: proportional calibration and global calibration. Proportional calibration adjusts proportionally based on measurement and provided concentration, while global calibration also adjusts line width parameters, requiring stable reference gas conditions.

TCP/IP and modem configuration: Set IP address, subnet mask, port number, and gateway.

File download/upload: Download instrument readings and settings to PC, or upload settings from PC to instrument.

Manual instrument control: Force the instrument into sleep mode, reset the microcontroller, test the current circuit and digital I/O, etc.

（4） Configure through AO2000 central unit

The parameters of the laser analyzer can be configured through the AO2000 display and control unit, which has the same effect as using service software, including setting gas concentration units, temperature and pressure input methods and values, optical path parameters, etc.

Operation, maintenance, and calibration

（1） Operation mode

Startup mode: After booting up, perform initialization, self-test, and startup until the laser temperature stabilizes within an acceptable range.

Measurement modes: including normal, zero and span modes. Normal mode outputs measurement data periodically, while zero and span mode is used to verify instrument performance.

Fault mode: When the instrument detects a serious fault, it enters, stops measuring, and automatically attempts to restart after one hour.

（2） Maintenance

Daily maintenance: Regularly inspect optical transmission, clean windows and adjust alignment if necessary. For zero gas applications, test instrument response at least once every three months and check calibration every 3-12 months.

Clean the optical window: When the transmission drops below the reliable measurement level, clean it with non abrasive detergent or solvent. If there are cracks or damage, replace it.

Instrument alignment: When the alignment changes due to external stress, re align according to the installation procedure.

（3） Optimize flange blowing flow rate

There are two methods to determine the required purge flow rate: one is to turn off and turn on the purge flow, and analyze and measure concentration changes; Another approach is to adjust the measurement length and compare the concentration, and adjust the purge flow rate based on the results.

（4） Instrument calibration

The instrument has been calibrated with a certified gas mixture before leaving the factory, and does not require calibration after receiving it. After a period of use, it may need to be recalibrated due to laser aging. It is recommended to verify calibration annually with certified test gas and the provided gas pool.

Calibration requires the instrument to run for at least 1 hour, connect to the test cell, set the correct measurement configuration parameters, introduce calibration gas, stabilize, calibrate, and save the settings.

For reactive and "viscous" gases, stainless steel or PTFE tanks, shortest connecting pipes, and high flow blowouts should be used to ensure stable concentration.