Teledyne LGA-3500 - Laser Gas Analysis system - Manual (Page 84)

Maintenance and Calibration Model 3500
Teledyne Analytical Instruments 70
After initialization and self test, if the transmittance shown on LCD
is still low (lower than 80%), optimize the optical transmission
alignment according to instructions in section 6.1.3.
6.1.3 Optimize the Optical Transmission Alignment
For optimum analysis TAI recommends that you readjust and
optimize the optical transmission alignment twice a year. Refer to
section 3.6 for the specific optimization procedure and steps.
The Model 3500 automatically monitors the working conditions of
all key units. The system will prompt when specific unplanned
maintenance is needed. The above maintenance procedures are for
preventive purposes. If other system malfunctions occur, please contact
our technical support center immediately.
6.2. Calibration
All Model 3500 analysis systems are calibrated at the factory and
do not need calibration the first time they are used. However, with time,
system parameters may drift due to gradual aging of the laser device and
electronic parts in the system. This will affect measurement accuracy.
Therefore, periodic recalibration is necessary. Compared to the
conventional analysis systems such as the NDIR systems, the Model
3500 has a long calibration interval (over 3 months) due to its advanced
measurement principles and special low drift design.
transmitter
unit
calibratoin
tube
receiver unit
o-ring
tube connector mounting nut
Figure 6.1 Schematic of the calibration setup