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Troubleshooting Current Loops with Voltage Measurement

S Bharadwaj Reddy
Sometimes ammeter or current measurement with multimeter is unavailable at work locations , we can still perform useful troubleshooting measurements using nothing but a DC voltmeter / Multimeter with DC

Basics of Loop Powered Devices

S Bharadwaj Reddy
What are Loop Powered Devices? A lot of loop setups will utilize an external power supply in order to power the devices which are attached to the current loop. It

Troubleshooting a 4-20mA Current loop

S Bharadwaj Reddy
The basic layout of every 4-20mA loop consists of a power supply, a transmitter, and passive loop devices. The supply produces the energy to run the loop. The transmitter controls

Why 4-20mA Standard is so popular ?

S Bharadwaj Reddy
4-20mA Standard 4-20mA has an inherent ‘live zero’. Zero engineering units is 4.0mA, not 0.0mA. 0.0mA indicates an open circuit, a failure or a fault mode like cut wires or

Why Use a Current Loop?

S Bharadwaj Reddy
A Little Bit of History Before the advent of electronic circuitry, process control was a wholly mechanical endeavor. Facilities used pneumatic control signals where controllers were powered by varying pressures

Basics of 4-20mA Current Loop

S Bharadwaj Reddy
The 4-20 mA current loop is a very robust sensor signaling standard.  Current loops are ideal for data transmission because of their inherent insensitivity to electrical noise. In a 4-20

Basics of 4 to 20 mA analog Signals

S Bharadwaj Reddy
The  most  popular  form of signal transmission  used in modern  industrial  instrumentation  systems is the 4 to 20 milliamp DC standard. This is an analog signal standard, meaning that the

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