Search Results for: Pneumatic instruments

Field instrumentation interview Questions and answer

7 minutes of reading

What are the different process variables? Flow. Pressure. Temperature. Level. Quality i.e. % O2, CO2, pH etc Flow, pressure, temperature is the basic three variables. Define all the process Variable and state their unit of measurement Flow: It is defined as volume per unit of time at specified temperature and pressure Conditions, is generally measured by positive-displacement …

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Safety measures for a control system

5 minutes of reading

Introduction Safety is addressed in the first control objective, and some control decisions, such as controlling the pressure in the flash process, have been made to satisfy safety requirements. However, special control system features are required, because of the importance of this objective. These features are often implemented in multiple layers. Basic Process Control System …

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Loop checking basic Procedure

5 minutes of reading

what is mean by loop checking? Loop Checking means, First we want to check the continuity of cable. Then whether  24 V DC or  4 – 20 mA DC is coming from DCS or JB want to check. That is called loop Checking. After installation of instruments we must check full loop(instrument-junction box-control room) to ensure that whether the instruments are working properly or not, and whether …

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High-Pressure Sensors

3 minutes of reading

Introduction  For the purposes of this section, we will define high-pressure instruments as devices that are capable of measuring pressures in excess of 10,000 to 20,000 PSIG (700 to 1,400 bars) One might group these sensors by other characteristics, such as: 1. Mechanical, such as pressure repeaters, helical bourdon tubes, or dead weight testers 2. …

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Calibration procedure of DPT transmitter

2 minutes of reading

Introduction Differential pressure transmitter is an instrument used in industries to measure the flow. Calibration procedure of DPT transmitter is what we are going to discuss Equipments required Calibration procedure of DPT transmitter  If transmitter is analog transmitter In case of SMART Transmitter We have to use HART communicator, connect the communicator with the transmitter …

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Calibration of P/I converter.

2 minutes of reading

Introduction Pressure to current (P/I) converters are  two-wire precision instrument designed to convert standard pneumatic input signals into proportional output electrical signal. They are compact robust instruments suitable for panel or field mounting applications.In this session we are going to discuss the calibration of P/I converter.  Input signal: 3-15 psig.  Output signal: 4-20 mA  DC …

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Deatailed explanation of “How to read a Piping and Instrument Diagram(P&ID)?”

2 minutes of reading

This topic is already(Piping and instrumentation diagram) discussed in instrumentpedia. But now I feel that more explanation is required on this topic.That is why I decided to write a detail post about it. For reading a piping and instrumentation diagram someone should be very much familiar with the symbols.We can classify the instruments in to …

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What is hook up drawing? and How to read a hook up drawing?

1 minute of reading

Drawings which represents installation standards is called hook up drawings. With hook-up drawings, engineer can understand how an instrument to be installed in the plant. With hook-up drawing, we can calculate the material requirement. Two types of hook up drawings are there. 1. Pneumatic hookup. It is independent of process connection. Pneumatic hookup is basically …

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