Industrial compressors are often used in large chemical plants to supply headers with air for pneumatic instruments and valves. These compressors have to run at precise speeds. If they start to run too fast they can become very dangerous and expensive to repair.
If you have compressors or rotating equipment that is critical, consider the FDY PC Programmable Frequency-to-DC Converter. The FDY monitors frequency, period, high or low pulse width, and contact closure signals and converts it to a linear and isolated 4-20mA signal. The two-wire loop powered FDY has worldwide hazardous area approvals and sets up in just a few minutes with easy to use PC programming software.