Difference between Water Cooled Chiller and Air Cooled Chiller
In this post, we will learn the difference between water cooled and air cooled chillers in an HVAC system.
Pressure Detection Circuit
The below Figure shows a block diagram of a typical pressure detection circuit. Figure : Typical Pressure Detection Block Diagram The sensing element senses the pressure of the monitored system…
Basics of Level Measurement
Level Measurement Liquid level measuring devices are classified into two groups: (a) direct method, and (b) inferred method. An example of the direct method is the dipstick in your car…
Why RTD installed after the Orifice Plate ?
Why RTD installed after the Orifice Plate ? The location of the RTD (thermowell), positioned downstream of the orifice plate so the turbulence it generates will not create additional turbulence…
What is Emergency Shutdown System (ESD) ?
A critical condition for which immediate shutdown of the gas turbine and compressor is required and delayed shutdown options are not acceptable because of the danger posed to the compressor…
Functions of Pressure Detectors
Pressure Detector Functions Although the pressures that are monitored vary slightly depending on the details of facility design, all pressure detectors are used to provide up to three basic functions:…
Functions of Temperature Detectors
Functions of Temperature Detectors Although the temperatures that are monitored vary slightly depending on the details of facility design, temperature detectors are used to provide three basic functions: indication, alarm,…
Resistance Type Pressure Transducers Principle
Resistance-Type Pressure Transducers Included in this category of transducers are strain gauges and moving contacts (slidewire variable resistors). Figure 1 illustrates a simple strain gauge. A strain gauge measures the…
Inductance Type Pressure Transducers Principle
The inductance-type transducer consists of three parts: a coil, a movable magnetic core, and a pressure sensing element. The element is attached to the core, and, as pressure varies, the…
Capacitive Type Pressure Transducers Principle
Capacitive-type transducers, illustrated in Figure, consist of two flexible conductive plates and a dielectric. In this case, the dielectric is the fluid. As pressure increases, the flexible conductive plates will…
