Controls - Part B Flashcards
The three (3) primary reasons for sensing and measuring variables are to __________, __________, and __________.
Indicate, record, and control
The four (4) main types of measured variables are __________, __________, __________, and __________.
Temperature, pressure, liquid level, and flow rate
To protect thermometers and other sensing bulbs from high external pressures and possible damage, __________ are installed in pressure vessels and pipe.
Thermowells
The __________ __________ __________ produces a longer scale of measurement than other types, so a more accurate reading can be taken.
Inclined tube manometer
__________ or __________ to be applied to the gauge is connected to the housing that encloses the diaphragm.
Pressure or vacuum
As a result, the __________ rises and falls with the liquid level, and this movement can be used to operate a control valve.
Float
An __________ __________ is the most common form of restriction used to measure flow.
Orifice plate
The term __________ __________ is explained as the point where the area is at a minimum size; therefore, the fluid is at its highest velocity and lowest pressure
Vena contracta
__________ __________ sense impact and static pressure at the same instant.
Pitot tubes
On small systems, a __________ __________ __________ located in the compressor room supplies reduced pressure to the entire control system.
Pressure reducing station
The __________ __________ is to prevent dust or other airborne contaminants from entering the intake valves of the compressor.
Intake filter
The compressor oil must be the type recommended by the __________ to maintain the life of the compressor and the warranty.
Manufacturer
Limiting __________ in compressed air piping is of the utmost importance.
Condensation
Another type of dryer involves the use of __________, or chemicals, to remove moisture from the control air.
Desiccant
The __________ __________ is located in the piping between the compressor and the pressure reducing valve.
Moisture condenser
The ___________ ___________ has been decreased in the system, thereby reducing the amount of water deposited throughout the system.
Air temperature
Pneumatic controls are separated between ___________ and ___________ type control systems
HVAC and process
The ___________ ___________ located on the outside wall at the ground floor would make maintenance and future renovations more accessible.
Compressor room
For all pneumatic instrumentation systems, the ___________ ___________ ___________ is the major organization that writes and issues standards.
International Society of Automation
A ___________ ___________ that has a ___________ float must react at the correct elevation to maintain the function of the process.
Level meter, float
Precautions should be made when working moving equipment; ___________ and ___________ procedures should be followed.
Tag and lockout
When working on plant sites, follow the ___________ ___________ and ___________ ___________. Generally the industry plants exceed the OH&S rules and they must be followed.
Written regulations and safety rules
Consult the ___________ for relevant information on the material in the process lines.
MSDS
When troubleshooting the sensing and measuring variables, you should be primarily concerned with the:
Primary element
