Practical Instrumentation Questions - Instrumentation Tools

Double Block and Bleed Valves Opening or Closing Sequence

On processes where the fluid in question is especially dangerous, “double block and bleed” valve manifolds are often used to

In connecting a pressure transmitter or other pressure-measuring instrument to a process pipe or vessel, there must be some means

Some differential pressure transmitters are equipped with 5 way valve manifolds. These valve networks allow for blocking, equalizing, and bleeding

Differential pressure transmitters are very common in the process industries. Besides being used to measure pressure (both differential and gauge),

A Pirani gauge is a special pressure instrument designed to measure very low pressures (i.e. hard vacuums). It uses two

An ingenious circuit used to generate an electrical voltage signal from a differential capacitance pressure sensor is the Twin-T diode

Shown here is a very simple pressure transmitter, a device that measures a fluid pressure and converts that measurement into

Suppose the lamp refuses to light up. A voltmeter registers 24 volts between test points C and D: Simple Lamp

Suppose a differential pressure transmitter is used to measure the pressure dropped across a baghouse, an assembly using multiple fabric

A simple form of electronic pressure sensor could be made with a bourdon tube and a Linear Variable Differential Transformer,