General Information
06-237518-001
1-11
July 2018
1-5.3
IG-541 (Nitrogen, Argon, and Carbon Dioxide)
Kidde IGS using IG-541 are fixed fire extinguishing systems that use an inert gaseous mixture
of 52% Nitrogen, 40% Argon, and 8% Carbon Dioxide (IG-541), UN number 1956.
Specification for IG-541 is a Nitrogen/Argon/Carbon Dioxide 52%/40%/8% ratio by volume.
The tolerance of the mixture in air is as follows:
•
Nitrogen: 52% +/- 5%
•
Argon: 40% +/- 5%
•
Carbon Dioxide: 8% +/- 5%
1-5.3.1
Purity
Each element shall conform to the following purity specification:
Argon:
•
Argon greater than or equal to 99.99%.
•
Oxygen less than or equal to 10 ppm.
•
Water less than or equal to 10 ppm.
Nitrogen:
•
Nitrogen greater than or equal to 99.7%
•
Oxygen less than or equal to 10 ppm.
•
Water less than or equal to 10 ppm.
Carbon Dioxide:
•
Carbon Dioxide greater than or equal to 99.7%
•
Oxygen less than or equal to 10 ppm.
•
Water less than or equal to 10 ppm.
Note:
Only principal contaminants are shown. Other measurements may include: Carbon
Monoxide, Carbon Dioxide, Nitrogen Oxide, and Nitrogen Dioxide most < 20 ppm.
Figure 1-5. IG-541 Pressure/Temperature Curve Isometric Diagram for 200 bar, U.S. Customary Units
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