8 - Monitoring, measurement & control technology

Question 1

What is data logging?

Answer 1

Collecting data from sensors over a period of time.

Question 2

What are the procedures that must take place before data logging?

Answer 2

You must record:

• the logging period
• the logging intervals
• the location of the sensors

Question 3

What are some types of sensors?

Answer 3

• Heat
• Light (burglar alarms)
• Sound (alarms)
• Pressure (air pressure in planes)
• Humidity (weather)
• Passive Infrared Sensors (detect movement)

Question 4

What are some advantages of data logging?

Answer 4

• Don’t need staff to operate
• 24/7
• Fast
• No human error
• Never forgets to record

Question 5

What are some disadvantages of data logging?

Answer 5

• Equipment malfunction causes false readings

- Expensive

Question 6

What are some ways to control devices?

Answer 6

• Actuators, turn devices on/off
• Touch sensors
• Sequence of instructions

Question 7

What are the main components of a control system?

Answer 7

• Sensors
• Actuators
• Bells/sirens
• A computer/processor
• Output devices

Question 8

What are the two types of control system?

Answer 8

• Non feedback = constantly work regardless of data collected
• Simple control systems = computer reacts depending on the data it receives, e.g. security light, automatic doors