Teledyne LGA-3500 - Laser Gas Analysis system - Manual (Page 53)

Laser Gas Analyzer Operation
Teledyne Analytical Instruments 39
• Average times: number of times used to calculate average
concentration.
• Con. output--4mA: gas concentration value corresponding to
4mA of the 4-20mA gas concentration output.
• Con. output--20mA: gas concentration value corresponding to
20mA of the 4-20mA gas concentration output.
• Purge parameter: purging system parameters including the
length, temperature and density of the purging gas. Interaction
with the purge system is done through this menu.
• Transmission: Transmittance of laser beam in the environment
under test.
On this menu, the operator can move the cursor to a parameter
button, press “SET”, and a pop-up window occurs for the operator to
reset it (Figure 4.15). The items in the column refer to:
a. Item name
b. Value
c. Unit
d. Way to set the item (key in manually or from a measurement).
None will be shown here if it can only be keyed in.
4.3.3.1 S YSTEM P ARAMETER I NPUT M ETHOD
As an example, the following demonstrates the way to reset optical
path length.
1. Move the cursor to “Length” button and press “SET”. The Path
length input window pops up.