C- Type Bourdon
C-type bourdon tubes are used for ranges as low as 0 - 15 psig (0 - 100 kPa) and as high as 0 - 1500 psig (0 - 10,000 kPa). They are simple, accurate, and have good repeatability, but they are bulky and highly subject to damage from over-ranging. Most C-type bourdon tubes will tolerate only minimal overpressure.
Helical bourdon tubes are used for ranges as low as 0 - 200 psig (0 - 1300 kPa) up to 0 - 6000 psig (0 - 40,000 kPa). Heavy-duty helical bourdons can sometimes tolerate as high as ten times the maximum range pressure.
Spiral bourdon tubes are used for both very low ranges and very high ranges. Very sensitive units are manufactured to measure as low as 0 -10 psig (0 - 65 kPa). Heavyduty units can measure up to 0 -100,000 psig (0 -700,000 kPa).