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With a simple sketch diagram, explain the basic working principle of the following temperature sensors:.
Save extra with 2 Offers. Bhattacharya, S. The text has been written so as to create interest in the minds of students in learning further. After reading this book the student will be able to:.
Instrumentation is a collective term for measuring instruments that are used for indicating, measuring and recording physical quantities. The term has its origins in the art and science of scientific instrument-making. Instrumentation can refer to devices as simple as direct-reading thermometers , or as complex as multi-sensor components of industrial control systems.
Today, instruments can be found in laboratories, refineries, factories and vehicles, as well as in everyday household use e. Elements of industrial instrumentation have long histories. Scales for comparing weights and simple pointers to indicate position are ancient technologies. Some of the earliest measurements were of time.
One of the oldest water clocks was found in the tomb of the ancient Egyptian pharaoh Amenhotep I , buried around BCE. By BCE they had the rudiments of an automatic control system device. In Christopher Wren presented the Royal Society with a design for a "weather clock". A drawing shows meteorological sensors moving pens over paper driven by clockwork.
Such devices did not become standard in meteorology for two centuries. Integrating sensors, displays, recorders and controls was uncommon until the industrial revolution, limited by both need and practicality. Early systems used direct process connections to local control panels for control and indication, which from the early s saw the introduction of pneumatic transmitters and automatic 3-term PID controllers.
The ranges of pneumatic transmitters were defined by the need to control valves and actuators in the field. Typically a signal ranged from 3 to 15 psi 20 to kPa or 0.
Transistor electronics enabled wiring to replace pipes, initially with a range of 20 to mA at up to 90V for loop powered devices, reducing to 4 to 20mA at 12 to 24V in more modern systems. The transistor was commercialized by the mids. Instruments attached to a control system provided signals used to operate solenoids , valves , regulators , circuit breakers , relays and other devices. Such devices could control a desired output variable, and provide either remote or automated control capabilities.
The transformation of instrumentation from mechanical pneumatic transmitters, controllers, and valves to electronic instruments reduced maintenance costs as electronic instruments were more dependable than mechanical instruments. This also increased efficiency and production due to their increase in accuracy. Pneumatics enjoyed some advantages, being favored in corrosive and explosive atmospheres.
In the early years of process control , process indicators and control elements such as valves were monitored by an operator that walked around the unit adjusting the valves to obtain the desired temperatures, pressures, and flows. As technology evolved pneumatic controllers were invented and mounted in the field that monitored the process and controlled the valves.
This reduced the amount of time process operators were needed to monitor the process. Later years the actual controllers were moved to a central room and signals were sent into the control room to monitor the process and outputs signals were sent to the final control element such as a valve to adjust the process as needed. These controllers and indicators were mounted on a wall called a control board. The operators stood in front of this board walking back and forth monitoring the process indicators.
This again reduced the number and amount of time process operators were needed to walk around the units. The most standard pneumatic signal level used during these years was 3—15 psig. Process control of large industrial plants has evolved through many stages. Initially, control would be from panels local to the process plant. However this required a large manpower resource to attend to these dispersed panels, and there was no overall view of the process.
The next logical development was the transmission of all plant measurements to a permanently-manned central control room. Effectively this was the centralisation of all the localised panels, with the advantages of lower manning levels and easier overview of the process.
Often the controllers were behind the control room panels, and all automatic and manual control outputs were transmitted back to plant. However, whilst providing a central control focus, this arrangement was inflexible as each control loop had its own controller hardware, and continual operator movement within the control room was required to view different parts of the process. These could be distributed around plant, and communicate with the graphic display in the control room or rooms.
The distributed control concept was born. The introduction of DCSs and SCADA allowed easy interconnection and re-configuration of plant controls such as cascaded loops and interlocks, and easy interfacing with other production computer systems. It enabled sophisticated alarm handling, introduced automatic event logging, removed the need for physical records such as chart recorders, allowed the control racks to be networked and thereby located locally to plant to reduce cabling runs, and provided high level overviews of plant status and production levels.
In some cases the sensor is a very minor element of the mechanism. Under most circumstances neither would be called instrumentation, but when used to measure the elapsed time of a race and to document the winner at the finish line, both would be called instrumentation.
A very simple example of an instrumentation system is a mechanical thermostat , used to control a household furnace and thus to control room temperature. A typical unit senses temperature with a bi-metallic strip. It displays temperature by a needle on the free end of the strip. It activates the furnace by a mercury switch. As the switch is rotated by the strip, the mercury makes physical and thus electrical contact between electrodes.
Another example of an instrumentation system is a home security system. Communication is an inherent part of the design. Modern automobiles have complex instrumentation. In addition to displays of engine rotational speed and vehicle linear speed, there are also displays of battery voltage and current, fluid levels, fluid temperatures, distance traveled and feedbacks of various controls turn signals, parking brake, headlights, transmission position.
Cautions may be displayed for special problems fuel low, check engine, tire pressure low, door ajar, seat belt unfastened. Problems are recorded so they can be reported to diagnostic equipment. Navigation systems can provide voice commands to reach a destination. Automotive instrumentation must be cheap and reliable over long periods in harsh environments.
There may be independent airbag systems which contain sensors, logic and actuators. Anti-skid braking systems use sensors to control the brakes, while cruise control affects throttle position. A wide variety of services can be provided via communication links as the OnStar system.
Autonomous cars with exotic instrumentation have been demonstrated. Early aircraft had a few sensors. A magnetic compass provided a sense of direction. The displays to the pilot were as critical as the measurements.
A modern aircraft has a far more sophisticated suite of sensors and displays, which are embedded into avionics systems. The aircraft may contain inertial navigation systems , global positioning systems , weather radar , autopilots, and aircraft stabilization systems. Redundant sensors are used for reliability. A subset of the information may be transferred to a crash recorder to aid mishap investigations.
Modern pilot displays now include computer displays including head-up displays. Air traffic control radar is distributed instrumentation system. The ground portion transmits an electromagnetic pulse and receives an echo at least.
Aircraft carry transponders that transmit codes on reception of the pulse. The system displays aircraft map location, an identifier and optionally altitude. The map location is based on sensed antenna direction and sensed time delay.
The other information is embedded in the transponder transmission. Laboratory equipment is available to measure many electrical and chemical quantities. Such a collection of equipment might be used to automate the testing of drinking water for pollutants. Instrumentation engineering is the engineering specialization focused on the principle and operation of measuring instruments that are used in design and configuration of automated systems in areas such as electrical and pneumatic domains, and the control of quantities being measured.
They typically work for industries with automated processes, such as chemical or manufacturing plants, with the goal of improving system productivity , reliability, safety, optimization and stability.
To control the parameters in a process or in a particular system, devices such as microprocessors, microcontrollers or PLCs are used, but their ultimate aim is to control the parameters of a system. Instrumentation engineering is loosely defined because the required tasks are very domain dependent.
An expert in the biomedical instrumentation of laboratory rats has very different concerns than the expert in rocket instrumentation. Common concerns of both are the selection of appropriate sensors based on size, weight, cost, reliability, accuracy, longevity, environmental robustness and frequency response. Some sensors are literally fired in artillery shells. Others sense thermonuclear explosions until destroyed. Invariably sensor data must be recorded, transmitted or displayed.
Recording rates and capacities vary enormously. Transmission can be trivial or can be clandestine, encrypted and low-power in the presence of jamming. Displays can be trivially simple or can require consultation with human factors experts. Control system design varies from trivial to a separate specialty. Instrumentation engineers are responsible for integrating the sensors with the recorders, transmitters, displays or control systems, and producing the Piping and instrumentation diagram for the process.
They may design or specify installation, wiring and signal conditioning. They may be responsible for calibration, testing and maintenance of the system. In a research environment it is common for subject matter experts to have substantial instrumentation system expertise. An astronomer knows the structure of the universe and a great deal about telescopes — optics, pointing and cameras or other sensing elements.
That often includes the hard-won knowledge of the operational procedures that provide the best results. For example, an astronomer is often knowledgeable of techniques to minimize temperature gradients that cause air turbulence within the telescope. Instrumentation technologists, technicians and mechanics specialize in troubleshooting, repairing and maintaining instruments and instrumentation systems.
The broad generalizations and theories which have arisen from time to time have stood or fallen on the basis of accurate measurement, and in several instances new instruments have had to be devised for the purpose.
Electrical Measurement Books
Source : ourmumbaicity. Handbook for Control Valve Sizing — page not available. Probably many other are in the same situation. This Web site used to be a serious one. Better post a shorter list but correct one! Download Link Updated. Now check again.
Below is the list of measuring instruments used in electrical and electronic work. From Wikipedia, the free encyclopedia. Electrical and electronic measuring equipment. Arbitrary waveform generator Digital pattern generator Function generator Sweep generator Signal generator Video-signal generator. Categories : Measuring instruments Electronic test equipment Electrical test equipment. Hidden categories: Articles with short description Short description is different from Wikidata.
Premium Membership. Electrical voltage and current are two important quantities in an electrical network. The voltage is the effort variable without which no current is available. It is measured across an electrical circuit element or branch of a circuit. The device that measures the voltage is the voltmeter.
[PDF] Measurements And Instrumentation Books Collection Free Download
The reason is the electronic devices divert your attention and also cause strains while reading eBooks. Knowledge of instrumentation is critical in light of the highly sensitive and precise requirements of modern processes and systems. Rapid development in instrumentation technology coupled with the adoption of new standards makes a firm, up-to-date foundation of knowledge more important than ever in most science and engineering fields. EasyEngineering team try to Helping the students and others who cannot afford buying books is our aim.
Chapter 10 describes measurement methods to measure different electrical quantities, such as voltage, current, resistance capacitance, and many others. Chapter 11 describes the historical development of instrument control with the use of the personalFile Size: 1MB. Most of the students understood the electrical measurements and what most importantly, they found that this subject was interesting, and even fascinating. Let us look at modern measurement techniques, the present state and the future perspectives. There is no doubt that the future is reserved for computer measuring systems.
With a simple sketch diagram, explain the basic working principle of the following temperature sensors:.