Other advantages of this design include the high overrange protection available. For example, a 0 to 1,000 PSIG (0 to 6.9 MPa) element may be safely exposed to 10,000 PSIG (69 MPa) pressure, and it is suitable for pressure measurement on continuously fluctuating services. The range of the helical coil is affected by the diameter, wall thickness, number of coils used, and construction materials. High-pressure elements might have as many as 20 coils, while low-span sensors can have only 2 or 3 coils.