York ycal low ambient kit6/5/2023 The unit structure is heavy-gauge, galvanized steel.This galvanized steel is coated with baked-on powder paint, which, when subjected to ASTM B117 1000 hour, salt spray testing, yields a minimum ASTM 1654 rating of “6”. Units are designed in accordance with NFPA 70 (National Electric Code),ASHRAE/ANSI 15 Safety code for mechanical refrigeration,ASME, Listed and labeled with Intertek Testing Services (ETL) and rated in accordance with ARI Standard 550/590-2003.Ĭorrosion resistant wire mesh panels are added to protect the condenser coil from incidental damage and restrict unauthorized access to internal components. The chiller has suction-gas cooled, hermetic, scroll compressors.OMEGA transducers have three main types of electrical outputs millivolts (mV), volts (V), and current (mA). It is important for the user to know which output suits his application to ensure proper selection of a transducer. TRANSDUCER OUTPUTS AND THEIR WIRING CONFIGURATIONS The following will describe the advantages, disadvantages, and wiring for millivolt, volt and current output transducers. Transducers with a millivolt output are generally used in laboratory applications. They are low cost, small in size, and require a regulated power supply. Remembering that the millivolt signal is very low level, it is limited to short distances (up to 200 feet is usually considered the limit) and is very prone to stray electrical interference from other nearby electrical signals (other instrumentation, high ac voltage lines, etc.). Typical wiring configurations are shown in Figure 1. Transducers with an amplified voltage output are generally used in a light industrial environment and computer interface systems, where a higher level dc signal is required. Due to the built-in signal conditioning, they are higher cost and larger in size than the millivolt output transducers. Typical wiring configurations are shown in Figure 2.Ī transducer produces millivolts, amplified voltage, or current output.Īmplified voltage signals can travel up to medium distances and are much better in their immunity to stray electrical interference than the millivolt signal. A transmitter produces current output only. Again, due to the built-in signal conditioning, the transmitters are higher cost and larger in size than the millivolt output transducers. Unlike the millivolt and voltage output transducers, a current signal is immune to any stray electrical interference, a valuable asset in the factory. A current signal also can be transmitted long distances. HANDLING, LOCATING AND INSTALLING TRANSDUCERS Figure 2 Typical wiring configurations are shown in Figure 3. Diaphragm - Do not press or touch the diaphragm as you may damage or alter its calibration, particularly on low pressure range models. Fittings and Hardware - Use appropriate pressure rated fittings and hardware. Make sure you have the correct thread type and size fitting. Use pressure limiters, capacity chambers, snubbers, etc., if needed. Operate at Ambient Temperatures- Locate the transducer where it can be readily inspected and serviced. Ambient temperature should be within the transducer specifications. The temperature coefficient effects on the overall accuracy of the transducer can be minimized the closer the ambient temperature is to 25☌. Avoid locations with excessive vibration. When installing transducers, refer to standard industry torque data for thread size and material type.įigure 3 DETERMINING HOW MANY TRANSDUCERS CAN BE EXCITED FROM ONE POWER SUPPLY Installation - Installation should be made only by qualified personnel familiar with safety practices and knowledgeable with all industry accepted standard relating to pressure systems.Transducer calibration and/or zero may shift if it is over-torqued when installing. Multiple transducers can be excited from one power supply.
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