![]() ![]() With the distribution, a balance of supply and return flows is made, to know the true capacity of the chiller that is needed, so as not to oversize the equipment.Value of each water flow and its respective temperature value, to project the distribution and the piping system.With the minimum required temperature value, the type of chiller that is needed must be classified.Value of the minimum required temperature.Table of models of the most recognized chiller manufacturers.įirst steps to select the chiller you need. Some of the main manufacturers of chillers, we can see them in the following table, Chiller Manufacturer Chiller with Coaxial Tube condenser in tube. Chiller with at least one inverter compressor.ġ. Chiller with constant compressor speed, 2. Chiller Ultra-low temperature industrial refrigeration: For ranges between -60 ° F and -112 ° F.Ĭhiller Classification Summary: Chiller ClassificationĪccording to the outlet temperature of the chiller water.ġ.Low Temperature Industrial Chiller: Generally between + 20 ° F and -59 ° F.Medium and low industrial chiller for values between +20 ° F and + 35 ° F.Conventional Chiller: For temperatures greater than 35 ° F generally for air conditioning and machine cooling applications.Chiller can be classified according to the temperature value that the water reaches. The chiller can be used to generate temperatures in the water, from 7 ° C to temperatures below 0 ° C, where the use of glycol is necessary, to avoid freezing. Generally the difference between the water temperature, between the outlet and inlet is 5 ° C 10 ° F. ![]() Ice water can be used to generate air conditioning, or to cool machines. The chiller is a machine that, through a refrigeration cycle, is used to constantly cool a flow of water. Current consumption of the chiller compressor.Chiller compressor discharge temperature high.Chiller refrigeration circuit high pressure.Water temperature at the chiller inlet.Water temperature at the chiller outlet.Chiller compressor suction temperature.A pressure transducer, often called a pressure transmitter, is a transducer that converts pressure into an analog electrical signal. Although there are various types of pressure transducers, one of the most common is the strain-gage base transducer. The conversion of pressure into an electrical signal is achieved by the physical deformation of strain gages which are bonded into the diaphragm of the pressure transducer and wired into a wheatstone bridge configuration. Pressure applied to the pressure transducer produces a deflection of the diaphragm which introduces strain to the gages. The Electrical Output of Pressure Transducers The strain will produce an electrical resistance change proportional to the pressure. Pressure transducers are generally available with three types of electrical output millivolt, amplified voltage and 4-20mA. In this article how to wire different types of pressure transducers based on its output is explained.Īfterwards, it is necessary to convert an electric output into an engineering unit such as PSI or bars.īelow is a summary of the outputs and when they are best used. ![]() REPLACEING PRESSURE TRANSDUCER FOR YORK YCAL HOW TO Transducers with millivolt output are normally the most economical pressure transducers. The output of the millivolt transducer is nominally around 30mV. The actual output is directly proportional to the pressure transducer input power or excitation. If the excitation fluctuates, the output will change also. Because of this dependence on the excitation level, regulated power supplies are suggested for use with millivolt transducers. Because the output signal is so low, the transducer should not be located in an electrically noisy environment. The distances between the transducer and the readout instrument should also be kept relatively short. Voltage output transducers include integral signal conditioning which provide a much higher output than a millivolt transducer. The output is normally 0-5Vdc or 0-10Vdc.Īlthough model specific, the output of the transducer is not normally a direct function of excitation. This means unregulated power supplies are often sufficient as long as they fall within a specified power range.īecause they have a higher level output these transducers are not as susceptible to electrical noise as millivolt transducers and can therefore be used in much more industrial environments. These types of transducers are also known as pressure transmitters. Since a 4-20mA signal is least affected by electrical noise and resistance in the signal wires, these transducers are best used when the signal must be transmitted long distances. It is not uncommon to use these transducers in applications where the lead wire must be 1000 feet or more.
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