Controls- Part B Flashcards
(37 cards)
The three primary reasons for sending and measuring variables are to
Indicate record and control
The fore main typed of measured variables are
Liquid level temp pressure and flow rate
To protect thermometer and other sencing bulbs from high external pressure and possible damage,_______ are installed in pressure vessels and pipe
Thermoweld
The_________ ________ ______ produces a longer scale of measurement then other types so a more accurate reading can be take
Inclined tube manometer
_______or _______ to be applied to the gauge ID 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.
Pito tube
On a small system, a______ ______ ______ located in the compressor room supplies reduced pressure to the entire control system.
Pressure reducing station
The _______ _____ filter is to prevent dust or other airborne contaminants from entering the intake valves of the compressor.
Air filter
The compressor oil must be the type recommended by the _______ manufacturer to maintain the life of the compressor and the warranty
Manufacturer
Limiting _________ in compressed air piping is of the utmost importance
Moisture
Another type of dryer involves the use of ______ or chemical to remove moisture from the control air
Desiccant
The______ ______ is located in the piping between the compressor and pressure- reducing valve
Moisture condenser
The _______ _______ has been decreased in the system thereby reducing the amount of water deposited throughout the system
Air temperature
Precautions should be made when working moving equipment;________ and _____ procedures should be followed
Tag and lock
When troubleshooting the sensing and measuring variables, you would be primarily concerned with.
Primary element
A thermometer is really designed to measure
Molecular movement
When a pressure gauge is located on the process piping, it is classified as
Integral mounted
The sending element normally used in a pressure gauge is
Bourbon tube
The thermoelectric promoter temperature uses.
DC millivolts
Floats can control, indicate, or record events; this liquid level device is based on the laws of
Buoyancy laws
The only type of flow measuring device that accurately measures volume is the
Positive displacement type
