Why LEL important in Gas Detection?
In environments with combustible gas hazards, it is important to know long before the gas concentration reaches the LEL. Typical safety standards require that a gas detection unit give warnings…
What is Lower Explosive Limit & Upper Explosive Limit ?
The primary risk associated with combustible gases and vapors is the possibility of explosions. Explosion, like fire, requires three elements: fuel, Oxygen, and an ignition source. Each combustible gas or…
Importance of Device Diagnostics
Device diagnostics can be carried out using a handheld communicator in the field, a laptop in the workshop, or from intelligent device management software as part of asset management system,…
Difference between Explosion Proof and Intrinsically Safe
Electrical equipment sometimes must be installed in areas where combustible vapors and gases are used or may be present. These are commonly referred to as “hazardous locations”, and are defined…
Different Fieldbus Network Topologies
Topology involves the manner in which the fieldbus devices are connected to the data highway. There are several possible topologies that are employed as per the needs of the plant…
Microwave Flow Sensor – Working Principle and Applications
Microwave Flow Sensor is a Non-contact Flow Sensor that emits microwaves of 2.4GHz from the tip of its sensor to detect the flow.
Instrumentation Loop Diagrams
The Loop diagram sometimes called a loop sheet. Loop Diagrams Here we are discussing for the compressor surge control system (loop number 42): Here we see that the P&ID didn’t…
DC Circuits Multiple Choice Questions
DC Circuits Multiple Choice Questions Question 1 Determine the voltage dropped across resistor R3 in this circuit: (A) 7.5 volts (B) 3.0 volts (C) 6.6 volts (D) 15 volts (E)…
AC Circuits Multiple Choice Questions
AC Circuits Multiple Choice Questions Question 1 What will happen to the current in this circuit as frequency increases? (A) Current will remain the same (B) Cannot tell – not…
Instrumentation Functional diagrams
Functional diagrams are sometimes referred to as SAMA diagrams in honor of the organization responsible for their standardization, the Scientific Apparatus Makers Association. This organization has been succeeded by the…
