What is the reason why the pointer changes color after the meter has been used for a period of time?
Except for special purpose or required pressure gauges such as marine pressure gauges, the pointers of general pressure gauges are all black. After some pressure gauges have been used for a period of time, users find that the color of the gauge pointer has changed from the original black to approximately light red or off-white. Especially the stainless steel pressure gauge used in the open air is more obvious after the wind blows. This is specifically What's the reason?
There are generally two methods for pointer surface treatment: the first is oxidation treatment; and the second is painting treatment. The surface of the oxidized pointer is delicate and the gloss is beautiful, but the disadvantage is that after a period of use, especially after the meter is used in the open air, the pointer is especially easy to fade after exposure to the sun; while the spray-painted pointer has a thermal resistance. Not as fine and beautiful as the oxidized pointer, but it rarely fades after long-term use.
