Pressure

The most fundamental aspect of basic instrumentation for monitoring compressor performance is pressure. That is what the compressor does, it delivers gas at a pressure. In most cases, the measurement instrument is a common gauge. In covering these items, the basics of how the instrument works or why will be left to the reader. As was mentioned, space permits only a superficial treatment. In the era of computer monitoring, the pressure transducer or transmitter is becoming more prominent. This instrument converts the input signal into another form proportional to the input. For example, an electrical transducer or transmitter would convert a pressure signal to a proportional electrical output signal, a logical form for input to a computer or data logger. Chapter 10 discusses the basic requirements of pressure instrumentation in more detail.

It should be pointed out that it is probably not necessary to make as many redundant taps as called for in a code test. However, as long as taps are made, they can be made to provide information as accurately as possible, There is no point in putting a calibrated gauge or transducer into a pressure connection that is incapable of delivering a reliable reading.

Differential pressure is included in the pressure instrument class. Good differential readout gauges are still not all that common. Fortunately, in the transducer category, they are more readily available. Figure 8-26 covers some installation details for pressure-oriented instrument piping, supplementing the information presented earlier in Figure 8-8.

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