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Message ID: 8946     Entry time: Wed Jul 31 10:27:00 2013
Author: Steve 
Type: Update 
Category: VAC 
Subject: instrument grade air is discontinoued 

We have been using Air Liquide Instrument Grade Air for venting the 40m vacuum envelope. It is no longer available.

The replacement is Alphagas 1, total hydrocarbon <0.1% ppm

LINK TO Alphagaz

 

A- A+ Imprimer Partager

ALPHAGAZ™ Specifications

ALPHAGAZ™ range of Pure Gases for Analysis: two purity levels tailored to cover all your analytical needs.

Because each analytical application is sensitive to critical impurities that can affect your results, tests in our research center and analyzer manufacturers' studies confirm that the main impurities are moisture, oxygen and hydrocarbons.

Based on these critical impurities, Air Liquide has developed ALPHAGAZ™ brand with a Maximum Impurity Level (H2O, O2, CnHm).

  • The Maximum Impurity Level is the same across the whole product range. This constitutes a guarantee of quality with regard to major critical impurities and contamination tracers. ALPHAGAZ™ 2 offers an even greater guarantee in terms of purity (CO, CO2, H2).
  • The Minimum Total Purity is a prerequisite for product quality, but we do not stop there: Air Liquide selects and controls its gas sources by defining specifications regarding impurities that are critical for your analysis or application.

 

ALPHAGAZ™ 1 ALPHAGAZ™ 1 ALPHAGAZ™ 2 ALPHAGAZ™ 2 ALPHAGAZ™ AUTO IV ALPHAGAZ™ CO2 SFC
He, N2, H2,
Ar, O2
Air He, N2, H2,
Ar, O2
Air Air*, N2, O2 CO2
Specifications (ppm vol):
H2O < 3 ppm
O2 < 2 ppm
CnHm < 0.5 ppm
H2O< 3 ppm
CnHm< 0.1 ppm
CO2 < 1 ppm
CO < 1 ppm
H2O < 0.5 ppm
O2 < 0.1 ppm
CO2 < 0.1 ppm
CO < 0.1 ppm
CnHm < 0.1 ppm
H2 < 0.1 ppm
H2O < 0,5 ppm
CnHm < 50 ppb
CO2 < 0,1 ppm
CO < 0,1 ppm
NOx < 10 ppb *
SO2 < 10 ppb*
CnHm < 0.2 ppm
CO2 < 0.5 ppm
CO < 0.5 ppm
NO/NOx < 0.1 ppm
H2O < 5 ppm
O2 < 2 ppm
CnHm < 2 ppm
NVOC* < 2 ppm
CO < 5 ppm
NO + NO2 < 2 ppm
S Total < 1 ppm
H2 < 0.5 ppm
  20 ± 1 % O2 (Europe)
21 ± 1% O2 (North America)
  20,9 ± 1 % O2
*: Detection limit
*20 ± 1 % O2 *NVOC: Non Volatile Organic Compounds
Minimum Total Purity

 

 

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