1. Introduction
The SGI-3 is PBI-Dansensor’s portable oxygen indicator for measurement of O
2
levels,
especially in connection with shielded arc welding.
The SGI-3 was designed to measure the oxygen level in all sorts of welding gases, both
pure gases and formier gases.
The built-in measuring gas pump ensures that gas is supplied to the oxygen indicator from
the measuring point, and a row of LEDs indicate the value measured. The more LEDs lit,
the lower the oxygen level at the measuring point. The measuring range for pure gases is
between 5000 ppm (0.5%) to 1 ppm oxygen in inert welding gases and between 500-10
ppm for formier gases.
The oxygen sensor is a zirconium oxide sensor developed by PBI-Dansensor, which
makes it possible to measure the very low oxygen levels (below 30 ppm) required in order
to ensure high-quality welding.
In addition, the oxygen indicator has an output for data collection. This facility allows
automatic documentation of the quality of each individual weld.
A programmable acoustic alarm function makes it possible to perform welds within the
required oxygen range without having to read the indicator while welding.
Figure 1. SGI-3
PBI-Dansensor A/S SGI-3/OXI-3/OXI-3.1 User manual
4 PBI-210247-H UK 07/11/2005
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