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There are many factors that affect proper pressure gauge selection but if you follow the following steps then selection becomes simpler and more exact.
The process media that the gauge will be subjected to is critical in the primary selection of a pressure gauge. The two most widely used pressure gauges have either a brass connection with an internal phosphor bronze bourdon tube or 316 stainless steel connection and internal bourdon tube. Consulting a chemical compatibility chart will assist in initial pressure gauge selection. Diaphragm seals (connected to pressure gauge) are available for use in all industries including food and beverage, petroleum, chemical, paper and pulp, corrosive and non corrosive applications where the process media may contain solid particles which would inhibit the life of a bourdon tube gauge. Gauges for use on gases such as Oxygen, Acetylene etc are of special construction, consult your JBS store for technical advice.
The range of the pressure gauge should be twice the system operating pressure. If the system pressure is nominally 800 kPa than a 1600 kPa pressure gauge is recommended. If fluctuating pressures are present, the gauge should be liquid filled to reduce the stress on the internal bourdon tube and extend the life of the gauge.
If the gauge is subjected to a harsh environment where corrosive or dust materials may enter the gauge then a hermetically sealed and/or liquid filled should be requested. In addition, if the gauge is subjected to excessive heat then remote mounting is highly recommended.
Pressure gauges accuracy is expressed as a percentage of the full scale deflection (FSD). If the gauge has a stated accuracy of +/- 1% FSD and the gauge has a span of 4000 kPa, then the inaccuracy of the gauge could be +/- 40 kPa over the entire range. Pressure gauge accuracies may vary from +/- 3% to 0.25% of FSD. Critical to non-critical accuracy requirements will determine the proper selection of your pressure gauge. Calibration certificates indicating pressure gauges inaccuracies over the span are available on request.
Floyd Instruments offers pressure gauge sizes (dial size) from 50mm up to 300mm and is determined by readability requirements. Most popular gauge sizes are 63mm, 100mm and 150mm. More accurate pressure gauges generally have larger dial sizes.
In Australia, standard pressure connections are 1/8 BSPT, ¼ BSPT, 3/8 BSPT and ½ BSPT dependent upon gauge size. NPT and BSPP thread sizes are also available upon request.
Pressure gauges are mounted in the following ways:- Direct mount, bottom entry (most common, mounted by process connection at the 6 o’clock position Direct mount, rear entry (process connection at the rear of gauge, either centre rear or bottom rear. Surface mount, bottom entry (rear three hole mounting flange for wall mounting, process connection at the 6 o’clock position Flush mount, rear connection (front three hole mounting flange for hole mounting, process connection at the rear of gauge, either centre rear or bottom rear. Panel Mount, rear connection, (“U” clamp hole mounting, process connection at the rear of gauge, either centre rear or bottom rear.