[Weekly Image] Methanol Technical Version – Standards for the installation and commissioning of on-site instruments
Thread Content
This post was last edited by qy576100527 on 2017-7-15 21:23. Standards for turning on and off local instruments: 1. Off is represented by green, and on is represented by red. 2. The upper and lower lines should be placed directly above the scale markings on the dial. 3. The upper and lower lines must be parallel to the scale markings on the dial. 4. The small tip points outward toward a certain scale on the dial, in the same direction as the pointer. 5. The lower limit line is placed at the lowest value of the operating range or the low alarm value, while the upper limit line is placed at the highest value of the operating range or the high alarm value.
5. The lower limit line is placed at the lowest value of the operating range or the low alarm value, while the upper limit line is placed at the highest value of the operating range or the high alarm value.
This post was last edited by liaifeng on 2017-8-8 22:08. Haha, just as I thought! Actually, for greater reliability, the markings inside the dial should be arranged in a more logical way! As shown in the figure below: http://ao*n17.com/uploads/110623/30-110623093H1146.jpg
I think the upper limit should be at two-thirds of the gauge scale; if it exceeds two-thirds in actual use, a pressure gauge with a larger range should be chosen. If the pointer remains above two-thirds for an extended period, the spring inside the gauge will become fatigued, resulting in inaccurate readings over time. As for the upper and lower limits, I personally think setting them at the 7th mark would be better, as it makes them more visible