Misting Pressure Gauges, Analog or Digital
Sounds like a boring subject but I am here to spice it up a bit. When I talk about gauges I am referring to pressures gauges for use with water on a misting system, Remember, Water In - Water Out.
Gauges can come in many flavors and sizes.
6. No Control, etc.
Stay away from cheap gauges. They don't last. When I say cheap I am talking about analog gauges in the $5.00 range. Analog gauges have a dial on them and a pointer or needle that indicates the pressure. Its annoying to see a broken analog gauge and I have seen allot. What is also annoying is a gauge with the type face size so small its difficult to read. You will appreciate big numbers on a gauge when you see them.
If you are buying a system (pump systems) that is pre-piped/pre-built with a gauge it will generally be an inexpensive analog gauge. That all depends on the quality of the system you are buying. If the manufacture talks about the quality of the gauge in any of there literature then generally you will get a decent gauge.
Analog gauges are by far the most popular. Some people don't even know there is such a thing as a digital gauge. Analog is the gauge that will be used on most misting systems.
The operating concept is basic. They have a small tube inside the gauge. When pressure is applied the tube bends. The tube is mechanically connected to the dial that move. Movement is displayed on the face, you get the picture.
As you can imagine that accuracy is not the greatest. +/- 5% is typical. Then there is the accuracy of the span. 5% worst case, maybe 1% is some spots of the gauge. However, with misting systems do you need accuracy? NO, not really. Back to the beginning of this page, you would like something that lasts!!!
The big problem with analog gauges is not the gauge itself but the vibration the gauge is subject to. The gauge is connected to a pipe, pipe to a pump, pump to a motor. That pump/motor/vibration combination is the cause of most analog gauge destruction. The the tube/needle combination is delicate and just shakes apart.
How is vibrations problem tackled? Liquid filled gauges. The internals of the gauge itself are filled with liquid. The liquid dampens the vibration. Liquid filled gauges are not that much more expensive than there counterpart. About $30.00 a gauge, sometimes less. If you are a homeowner or small contractor go to Northern Tool. The have a good selection of liquid filled gauges.
Analog vs Digital
The differences are pretty simple, one is inexpensive and the other is expensive. One is somewhat accurate and the other is quite accurate. One need no power and the other needs power. One has no control (except for the human eye) and the other has microprocessor built into it. One is analog and the other is digital. FYI, digital pressure gauges are about 10x more expensive that analog, and that's a starting point.