Understanding Instrumentation Signals Quiz

Instrumentation Signals Overview

• Pneumatic signals utilize air or gases (e.g., nitrogen) for power in control systems.
• Pneumatic signals are commonly represented with a drawing of a pressure signal line.

Electrical Signals

• Electronic signals are powered by electricity and are essential for modern instrumentation.
• Electronic signals can be illustrated using circuit diagrams or waveforms.

Digital Signals

• Digital signals are based on microprocessors, using binary numbers (0s and 1s) for data representation.
• A typical drawing might show a binary sequence or digital simulation.

Continuous Measurement Signals

• Analog signals reflect continuous changes in process variables, providing real-time measurement mirroring actual conditions.

Pressure Transmitter Levels

• A pneumatic level transmitter that sends a 6 psi signal typically correlates to a specific level, implying low level in the vessel.
• When the same transmitter sends a 12 psi signal, it indicates a higher level in the vessel as pressure correlates with liquid height.

Electronic Level Indications

• An electronic level transmitter indicating 75% full translates to a corresponding mA signal typically around 4-20 mA, with 75% represented as 16 mA in a linear scale.

Temperature Measurement

• For an electronic temperature transmitter calibrated from 100°F to 200°F, a temperature of 150°F equates to a specific mA output, which is half of the range, generally around 12 mA.

Pressure Measurement

• An electronic pressure transmitter calibrated from 200 psig to 400 psig would send an output signal of approximately 16 mA at 350 psig, as it falls within the upper half of the pressure scale.

Binary Representation

• The binary representation of the number 13 is 1101, demonstrating how decimal values are converted into binary for digital communication.