- Working Pressure - On a static load, a gauge should be used at approx. 50 percent of the Full Scale. This ensures that the lifetime of the gauge is extended and that a sudden surge will not over-pressure the gauge fitted. an example is; a working pressure of 50psi should be gauged with a 100psi pressure gauge.
- Fluctuating Pressure - Fluctuating pressures can greatly reduce the lifetime of the pressure gauge. many manufacturers will suggest some kind of pressure restricting screw that can be screwed into the male thread by hollowing and threading. If fluctuation is severe then make sure you select a gauge well above the working pressure. Some manufacturers will suggest a maximum pressure indicator which follows the pointer on the up scale and is left behind on the drop showing the user how high the pressure has spiked between montioring phases.
- Maximum Pressure - Never over pressure the gauge. Many gauges are designed to take a little over the maximum on the dial, however, if you see the pointer on max then shut off the pressure to the gauge and replace with a higher ranged gauge. It is always best to use a shut-off valve so that it is possible to stop the pressure flow at any given time.
- Pressure Medium - Corrosive mediums can eat away at the gauge. All Stainless Steel gauges are available should they be required.
- Hazardous Medium – If the medium being measured is toxic, flammable, explosive. Then gauges should be ordered and installed by a qualified engineer. Extreme Caution Needed!!!!
- Medium Temperature – Gauges can stand a fair bit of heat, however glycerine filled gauges can become discoloured. To be on the safe side, use a cooling pipe with a loop to cool the medium or order a specially built, purpose made gauge. 50° should not be exceded on a standard gauge.
- Gases & Steam – Special gauges can be made with safety features. You do not want to burn the face of the user in the instance of gauge failure. Contact a manufacturer for Safety gauges.
Pressure Gauges - Selecting The Correct Gauge
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29 July 2009
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