ADVANTAGES
Simplicity of the components and no complex structure
Easy maintainability
Useful in flame-proof applications
Low cost of installation
Good reliability and reproducibility
Speed of response is relatively slow but steady
Limited power capacity for large mass transfer
LIMITATIONS
Great distance lag can be a crucial setback with pneumatic controls.
Slow response
Difficult to operate in sub-normal temperatures
Copper piping is vulnerable to damage
Pipe-couplings can give rise to leaks in certain ambient conditions