1. Regulators, Switches, Relays & Annunciators - Agenda
Activity
Estimated Time
1. Agenda 5
2. Learning Objectives
3. Regulators 50
BREAK 10
4. Switches
5. Relays and Enunciator Systems 40
6. Summary and Wrap-Up
7. Additional Activities
8. Lab Activity
Slide 1
Instrumentation 2 – Session 2

2. Objectives (page 1)
Given a drawing, picture or actual device, identify and describe pressure regulators.
Define the following terms associated with regulators:
back pressure regulator
pressure reducing regulator
Given a PFD or P&ID, locate and identify pressure regulators used in process control.
Given an instrument air pressure regulator, perform the following tasks:
blow down regulator to check for condensate or oil
set specific pressure for operating final control element
Define the function of a switch.
Describe three common uses for switches in process control.
Slide 2
Instrumentation 2 – Session 2

3. Objectives (page 2)
Given a drawing, picture, or actual device, identify and describe basic switch devices.
Define the following terms associated with switches used in process control:
autostart switch, by pass switch, on/off/auto switch, limit switch, proximity switch, vibration switch, process variable switch
Given a PFD or P&ID, locate and identify switches used in process control.
Explain how relays are used in the process industry.
Given a ladder diagram and a legend, locate a relay.
Explain the purpose of annunciator systems.
Define terms associated with annunciator systems:
first out, acknowledge/reset/test modes
Slide 3
Instrumentation 2 – Session 2

4. Switches
Slide 4
Instrumentation 2 – Session 2

5. Common Switch Types On/Off/Auto Switches Alarm Switches
Shutdown Switches
Autostart Switches
Bypass Switches
Slide 5
Instrumentation 2 – Session 2

6. Limit Switch
Slide 6
Instrumentation 2 – Session 2

7. Proximity Switch
Slide 7
Instrumentation 2 – Session 2

8. Vibration Switch
Slide 8
Instrumentation 2 – Session 2

9. Process Variable Switch
Slide 9
Instrumentation 2 – Session 2

10. Switch Symbols
Slide 10
Instrumentation 2 – Session 2

11. Relays Pneumatic and Hydraulic Relays Electrical and Electronic Relays
Timing Relays
Pneumatic Booster Relay
Selection Relay
Slide 11
Instrumentation 2 – Session 2

12. Annunciator
Slide 12
Instrumentation 2 – Session 2