The system shall be solid state with no moving parts. The pressure sensors shall be inherently digital in nature and shall use a vibrating wire, vibrating tuning fork or piezo electric crystal as the means for directly translating force into a proportional frequency (digital) signal. The sensors shall have an accuracy of (+ or -) 0.05% or better. For pressurized tanks, a pressure sensor shall be installed in the vapor space. Additional functions such as high and low level contact outputs, local indicators and hand held diagnostic devices shall be provided as required