Instrument Standard Signal

What does the 4 mA current level in a 4-20 mA loop typically represent?

• Minimum measured value

• Zero measured value

• Faulty loop condition

• Maximum measured value

What does the 20 mA current level in a 4-20 mA loop typically represent?

• Minimum measured value

• Zero measured value

• Maximum measured value

• Power supply failure

What is the main advantage of using a 4-20 mA current loop over a voltage signal?

• Faster data transmission

• Lower power consumption

• Reduced sensitivity to noise

• All of the answer

What type of wire is typically used for 4-20 mA loops?

• Single-stranded copper

• Twisted pair

• Coaxial cable

• Any type of wire will work

What are the two main types of power supplies used for 4-20 mA loops?

• DC

• Linear and switched

• Constant current and constant voltage

• Analog and digital

How can a fault in a 4-20 mA loop be identified?

• By measuring the loop voltage

• By observing the current level

• By checking the wiring connections

• All of the answer

What is the purpose of a shunt resistor in a 4-20 mA loop?

• To convert current to voltage

• To protect the transmitter from overload

• To adjust the loop sensitivity

• All of the answer

What is the recommended maximum loop resistance for a 24 VDC 4-20 mA loop?

• 250 ohms

• 500 ohms

• 1000 ohms

• All of the answer

A pressure transmitter has a range of 0 to 10 barg and a 4-20 mA output. What is the current output when the pressure is 5 barg?

• 8 mA

• 10 mA

• 12 mA

• 15 mA

What happens to the measured value if a short circuit occurs in a 4-20 mA loop?

• The reading remains at 4 mA.

• The reading jumps to 20 mA

• The reading falls to 0 mA.

• The reading becomes erratic.