Galvanic Applied Sciences AccuChrome MA2963, Operation Manual

Page: 96 / 145

Revision 4 83 12/15/2018
Section 7 ACCUCHROME Validation
7.1 Overview
The ACCUCHROME should be validated on a monthly basis or as per the measurement
requirements of the user.
The validation process involves analyzing a known gas mixture and comparing the analyzer
results to the certified value of the known mixture. This known mixture is referred to as the
calibration gas. The validation process is also used to assess the status of the
chromatograph and may be useful in indicating the presence of e potential problems such as
worn chromatograph valves or contaminated columns.
The calibration gas should be a mixture of all of the gasses the chromatograph is to measure
in proportions similar to those in the actual sample. The composition of a typical calibration
blend is shown in Table 7-1 for a C6+ measurement of natural gas. The calibration gas
should be obtained with a certificate of composition.
Table 7-1: Composition of a Typical Natural Gas Calibration Blend
Component Mole %
Methane Balance (89.67 %)
Ethane 5 %
Propane 1 %
n-Butane 0.3 %
iso-Butane 0.3 %
n-Pentane 0.1 %
iso-Pentane 0.1 %
n-Hexane 0.03 %
Nitrogen 1 %
Carbon Dioxide 2.5 %