Teledyne LGA-3500 - Laser Gas Analysis system - Manual (Page 49)

Laser Gas Analyzer Operation
Teledyne Analytical Instruments 35
Users can set the unit for concentration, length, temperature and
pressure by pressing “SET” in different cursor locations. For example,
press “SET” when the cursor is on Con. Unit, the system enters the
following menu:
Figure 4.11 Set Con. Unit menu
The following units for concentration, length, temperature and
pressure are available:
• Con. Unit: ppm, %, g/m 3 , g/Nm 3 , mg/m 3 , mg/Nm 3
• Len. Unit: m, cm, ft, inch
• Temp. Unit: °F, K, °C
• Pres. Unit: bar, Pa, mbar, psi, Mpa
Six units are provided in the Con. Unit menu to choose from: ppm,
%, g/m 3 , g/Nm 3 , mg/m 3 , and mg/Nm 3 . Units in ppm and % are
commonly used for volume percentage concentration while g/m 3 and
mg/m 3 are mass volume ratio concentration units related to volume
percentage concentration through the ideal gas equation . The units
g/Nm 3 and mg/Nm 3 are mass volume ratio concentration units (standard
state , pressure: 1.01325Bar, temperature: 273.1K).