Calibration in Fieldbus terminology The terminology differs between the calibration of the conventional instrument and the digital one. Traditionally in metrology, the word calibration means that the instrument under test is compared to a more precise instrument and may include trimming or adjusting the instrument to show the correct readings again. In fieldbus terminology, the …
INTRODUCTION Transmitters are referred to as “analog,” “microprocessor based,” “intelligent,” “smart,” “fieldbus,” etc. depending on the technology used. An “analog” transmitter has no microprocessor and therefore its linearization, temperature compensation, and diagnostics are rudimentary. An analog transmitter is configured by switches and jumpers and adjusted using potentiometers. A “microprocessor-based” transmitter is capable of much more …
Introduction In this session we are gonna discuss about Analog converters.In instrumentation analog conveters plays a major role in the field lets take an example of a thermocouple ,the output of thermocouple is in mill volt range for signal transmission we want to convert it into mA range .so lets discuss about some analog converters Pneumatic-to-Electronic …
Introduction The Level Control Valve with Bi-Level Vertical Float is a hydraulically controlled, diaphragm actuated control valve that controls reservoir filling in response to a hydraulic on/off float pressure command. The Valve opens at pre-set low level and closes at a pre-set high level Operation It is a float-controlled valve equipped with a “last position” …
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The calibration of the industrial thermometer cannot be done. All we can do is verify that they are reasonably correct. This is true for mercury in glass strip and bimetallic thermometers. The simplest way to calibrate the thermometer is to check the reading of the temperature under two conditions, the reading of the temperature at …
Introduction The Hydraulically Controlled On-Off Deluge Valve is an elastomeric, hydraulic pressure operated deluge valve, designed specifically for advanced fire protection systems and the latest industry standards. The Hydraulically Controlled On-Off Deluge Valve is activated by a hydraulic relay valve, by which opening and closing of the valve can be controlled remotely. The Hydraulically Controlled On-Off Deluge …
Introduction In this session we are gonna discuss about Normally Open, Anti Surge, pilot-operated and diaphragm-actuated control valve. This Anti-Surge Pump Start Control Valve has a double chamber actuator for positive and reliable performance with an external lifting spring, which gives the valve its normal opening characteristic. This allows the control valve a zero reaction time, …
What is Noise? Noise is defined as an undesirable electrical signal that distorts or interfere with an original signal. Noise can be generated from within the system or from outside source, for example: Internal noise Thermal noise Imperfections External noise Natural origin Electromagnetic interference Crosstalks Electromagnetic Noise: Electromagnetic noise is the most common noise that should …
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Introduction The aim of this unit is to describe the use of proportional, integral and derivative control. The course also introduces the newer methods of control; cascade, ratio, feedforward, adaptive and multi-variable. Proportional control action The basic continuous control mode is “proportional control”. With proportional control the controller output is algebraically proportional to the error …
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Introduction This Pressure Reducing Valve is an elastomeric, line pressure driven pilot operated pressure control valve. Designed specifically for advanced fire protection systems and the latest industry standards. This Pressure Reducing Valve reduces high upstream pressure to a precise, preset, stable downstream pressure. Due to its exceptional reliability and low head loss the valve is ideal …