Free Online Course

Wastewater Instrumentation, SCADA, and Process Control Fundamentals

Learn how plant instruments turn conditions into information, how control loops and SCADA use it, and how operators check readings, answer alarms and keep instruments reliable.

Start the Course
Time
About 70 minutes
Certificate
1.0 hour of completion
Credit
Not yet approved for continuing education credit
Price
Free
Format
72 narrated pages, checks and a final
Built by
A working wastewater operator (Washington Group III)

Who It's For

Wastewater operators at any level and people studying to become operators. No experience needed.

What You'll Learn

  • Explain what plant instruments measure, and how accuracy, range, units and trends affect a reading.
  • Describe analog and digital signals, open and closed loops, setpoints, deadbands, interlocks and fail-safe design.
  • Explain open-channel, magnetic and ultrasonic flow measurement, meter location, totalizers and flow checks.
  • Describe level, pressure and temperature measurement, float switches, radar and ultrasonic level, and high and low alarms.
  • Explain online analyzers for pH, dissolved oxygen, turbidity, conductivity and chlorine residual, sample systems and calibration.
  • Use SCADA screens, alarm priorities, alarm floods, the historian, remote sites and cyber awareness.
  • Inspect, clean and check instruments, record as-found values, spot common failures and write useful work orders.
  • Read the whole process: cause and effect, control loop response, bad data, peak flows and shift handoff.

The reading supports an operator; it does not replace observation.

What's Inside

  1. Understanding Plant Instruments 9 pages
    • Why Instruments Matter
    • Measure, Display, Control
    • Common Measurements
    • Local and Remote Readings
    • Accuracy and Repeatability
    • Range and Units
    • Trends, Not Snapshots
    • Operator Responsibility
    • Checkpoint
  2. Signals and Basic Control 9 pages
    • From Sensor to Screen
    • Analog Signals
    • Digital Signals
    • Open and Closed Loops
    • Setpoints and Deadbands
    • Manual and Automatic
    • Interlocks and Permissives
    • Fail-Safe Thinking
    • Checkpoint
  3. Flow Measurement 9 pages
    • Why Measure Flow
    • Open-Channel Flow
    • Magnetic Flowmeters
    • Ultrasonic Flow
    • Meter Location
    • Totalizers and Rates
    • Flow Checks
    • Flow Data Use
    • Checkpoint
  4. Level, Pressure, and Temperature 9 pages
    • Level Basics
    • Float Switches
    • Ultrasonic Level
    • Radar Level
    • Pressure Basics
    • Differential Pressure
    • Temperature
    • High and Low Alarms
    • Checkpoint
  5. Water-Quality Instruments 9 pages
    • What Online Analyzers Do
    • pH Measurement
    • Dissolved Oxygen
    • Turbidity
    • Conductivity
    • Chlorine Residual
    • Sample Systems
    • Cleaning and Calibration
    • Checkpoint
  6. SCADA, Alarms, and Records 9 pages
    • What SCADA Means
    • Screens and Symbols
    • Alarm Priorities
    • Acknowledge Is Not Fix
    • Alarm Floods
    • Historian and Trends
    • Remote Sites
    • Cyber Awareness
    • Checkpoint
  7. Maintenance and Troubleshooting 9 pages
    • Routine Inspection
    • Cleaning Sensors
    • Calibration Checks
    • As-Found Records
    • Common Failure Clues
    • Check the Simple Things
    • Work Orders and Spares
    • After Maintenance
    • Checkpoint
  8. Process Control and Good Decisions 9 pages
    • Reading the Whole Process
    • Cause and Effect
    • Control Loop Response
    • Bad Data Decisions
    • Storm and Peak Flow
    • Shift Handoff
    • Building Skill
    • Final Review
    • Checkpoint

Sample Page

Measure, Display, Control

The sensing part touches or observes the process. A transmitter changes that measurement into a signal. A display, recorder, or controller uses the signal. Knowing these parts helps an operator describe a problem clearly.

A level sensor may be working while the display is blank. That points the search toward power, wiring, communication, or the display instead of the wet well itself.

Think of the loop as a chain. A problem at any link can change what the operator sees. The sensor may be dirty. The transmitter may lose power. A cable may be damaged. The controller may use the wrong scale. The display may be showing old data. Checking the chain in order prevents random part changes. Start where the condition is measured, compare the local value, and then follow the signal toward the screen with qualified help when needed.

Use the plant loop drawing to name each part before reporting failure.

Key point: A complete instrument loop has a sensing part, a transmitter that makes the signal, and a display, recorder, or controller that uses it.

What to remember: A complete instrument loop carries information from the process to the operator or controller.

Questions

Does This Course Count Toward My Renewal?

Not yet. A course counts toward your continuing education credit only after your state approves it, and this one is not approved yet. This page will say which states approve it once they do.

Do I Need an Account?

Yes, to take the course. Signing in lets us record your time and issue your certificate. This page, the topic pages and the practice questions need no account.

Can I Skip Ahead?

No. Each page has a minimum time before the next one opens, and your time is recorded.

What Do I Get When I Finish?

A certificate of completion from Operator Master for 1.0 hour, once you pass the final with 80% or better. Your operator certificate or license always comes from your state, not from Operator Master.

Start the Course