Teledyne LGA-3500 - Laser Gas Analysis system - Manual (Page 88)

Maintenance and Calibration Model 3500
Teledyne Analytical Instruments 74
stabilized then run the calibration program in the PC service
program or from the system front panel.
9. Remove the transmitter and the receiver units from the
calibration devices and remount them onto the instrument
flanges.
10. Reset the optical path length, environment temperature and
environment pressure parameters for the environment under test.
CAUTION: RESETTING THE OPTICAL PATH LENGTH IS
NECESSARY. WITHOUT CORRECT PARAMETERS,
THE SYSTEM CANNOT ANALYZE THE GAS
CONCENTRATION CORRECTLY.
CAUTION: DO NOT CALIBRATE THE SYSTEM WHEN THERE IS
AN ERROR OR WARNING ALARM MESSAGE ON
LCD.
CAUTION: DO NOT CALIBRATE WHEN THERE IS GAS FLOW IN
THE ENVIRONMENT UNDER TEST AND THE VALVE
(IF INSTALLED) IS NOT CLOSED. THE PROCESS
GAS COULD ESCAPE INTO THE ROOM OR AIR
COULD ENTER THE PROCESS PIPE.
6.2.2 Calibration Software
Calibration of the Model 3500 can be performed by using the front
panel on the central processing unit or from a PC connected to the
central processing unit through RS232 interface. When you choose the
former method, please follow the instructions in section 4.3.4. If you
choose the PC option, please follow the PC service program instructions
in Appendix A. If you use the calibration tube available from TAI,
please refer to the calibration parameter table that comes with the
system.