Intrinsic Safe Calculation
The intrinsic safe calculation is an activity done by Instrumentation Engineers in EPC or EPCM Industries. In this article, we shall see why is it done and How to do…
Common Mistakes to Avoid When Using Dead Weight Tester
Dead weight testers are devices used to generate known amounts of fluid pressure, to be used as standards for calibrating pressure-measuring instruments. When properly configured and operated, the fluid pressure…
Metric Prefixes and Unit Conversions
Metric Prefixes Yotta = 1024 Symbol: Y Zeta = 1021 Symbol: Z Exa = 1018 Symbol: E Peta = 1015 Symbol: P Tera = 1012 Symbol: T Giga = 109 …
Problem with Pirani Gauge
A Pirani gauge is a special pressure instrument designed to measure very low pressures (i.e. hard vacuums). It uses two electrically heated filaments, one of which is sealed in a…
Differential Capacitance Pressure Sensor Circuit
An ingenious circuit used to generate an electrical voltage signal from a differential capacitance pressure sensor is the Twin-T diode circuit, shown here connected to a Rosemount-style differential capacitance pressure…
Pressure Transmitter using Potentiometer and Diaphragm
Shown here is a very simple pressure transmitter, a device that measures a fluid pressure and converts that measurement into an electrical signal: Suppose the potentiometer wiper will be at…
Indentify Faults in Simple Lamp Circuit including Failed Wires
Suppose the lamp refuses to light up. A voltmeter registers 24 volts between test points C and D: Simple Lamp Circuit First, list all the possible (single) faults that could…
Differential Pressure Measurement across Baghouse
Suppose a differential pressure transmitter is used to measure the pressure dropped across a baghouse, an assembly using multiple fabric “socks” to filter particulate material from a gas stream, like…
Electronic Pressure Sensor with Bourdon Tube and LVDT
A simple form of electronic pressure sensor could be made with a bourdon tube and a Linear Variable Differential Transformer, or LVDT. Pressure Sensor with Bourdon Tube and LVDT Explain…
PLC Scan Time
What is Scan Time? Every control system will take some time to execute its operation. Likewise, PLCs also takes time to perform a task. In simple terms, PLCs mainly has…
