Galvanic Applied Sciences 943-TGS-CE, Operation Manual

Page: 34 / 158

Revision 5 34 August 2021
Figure 13: Oven Cabinet Exterior
The instrument air must be at a pressure of 80-100 psig (5.5-6.9 barg), and must be clean,
dry, and oil-free as per Class 1 quality described in ISO 8753-1:2010. The instrument air
supplied to the analyzer must be capable of a sustained flow rate of 22 SCFM (37m
3
/hour)
at 80 to 100 psig.
Prior to connecting the instrument air line to the analyzer, all air lines should be blown down
to remove any possible debris such as dirt, scale, water, oil, etc., that could contaminate the
analyzer system. An additional filter should also be placed in line with the air line connected
to the oven cabinet air pressure regulator.
Do not adjust the instrument air pressure with this regulator until all internal tubing has been
installed in the oven enclosure as shown in Figure 8. Once all the tubing is installed, the
instrument air pressure indicated on the gauge can be adjusted to a suitable value (typically
30-50 psig).
The control cabinet is purged for two reasons: for hazardous area classification and to
maintain a positive pressure inside the control cabinet to minimize the exposure of electrical
equipment to the corrosive atmosphere commonly found in sulfur recovery units. The cabinet
purge should be initiated as soon as practical after the analyzer system is installed until the
analyzer is commissioned.
The control cabinet purge and pressurization is controlled by the purge/pressurization
system Electronic Power Control Unit (EPCU) or purge control box, as shown in Figure
14.