Are pneumatic controls explosion proof?
Pneumatic controls are explosion proof simple safe and reliable
What are Pneumatic controls operated by
Pneumatic controls are operated by air
What does a control loop contain?
A control loop contains, The sensor that measures the change in condition, The controller controls an output signal to the co controlled device. The sensore controller is often in the same device. And the controlled device reacts to stop start and modulat
Pneumatic air must be?
Pneumatic air must 0 to 20 psi and must be clean and dry
when a large volume of air is needed at the diaphragm the thermostat may feed branchline pressure to
What are the tolls of the pneumatic Technition
The tools of the pneumatic technician are an air gage, thermometer and a special wrench ( usually Allen type )
what is another term to describe sensitivity
Another term to used to describe sensitivity in electronic controls is gain
what is the advantage of a DDC
One advantage of DDC's is total building control management
One of the major components of a residential electronic control circuit that measures temperature is
Diagnostic light emitting diodes are often used to
alert the technician of problems
sensors are a device that
can measure some type of environmental parameter or a controlled variable that can understand - Temperature, pressure, humidity, light, position.
what do Passive sensors do
Passive sensors send information back to the controller in terms of resistance and Active sensors send information back to the controller in terms of milliamps
A control system consists of
sensors, controller, and controlled devices
DDC control systems can be used for:
Total building energy management, HvacR functions, building lighting fire protection, Temperature set back, Refrigeration.
what are Conventinal control systems
Conventinal control systems work very similar to a DDC system except that digital binary information can be processed much faster and is much more accurate at all times and under all conditions
what is an open loop control configuration ?
In an open loop control configuration, the control agent (fluid that transfers energy to mass such as hot or cold water) causes a change in the controlled medium (what absorbs or releases the energy or mass) and a closed loop configuration can maintain th