What is the correct purge system to use for a Class I, Div. 1 industrial display? It’s a common question asked of our technical support experts. Another variation: What choices do I have for HMI visualization and machine control in a Division 1 area and which purge system does it require?
The first two questions to answer are to what is the display connected and what is the HMI software. This information tells us whether we are looking at an industrial monitor, a panel PC, or a networked monitor via thin client or KVM back to a host in a safe area.
There a few simple ways to get the desired monitor or HMI interface into the hazardous area. For Class I, Division 1, the display requires a hazardous-rated LCD monitor and potentially a small purged enclosure. Peripherals such as barcode scanners, keyboards, etc., also need to be rated for the area.