HVAC Questions & Answers
Find the top Heating, ventilation, and air conditioning HVAC Questions & Answers for your interview preparation. HVAC Questions & Answers
Common
Study the common instrumentation and control engineering topics to upgrade your knowledge in industrial control systems and field instruments.
How ANSI Class Relates to PSI ?
Take a look through our website and you’ll see most of our pressure ratings are expressed as PSI – pounds
NPT Connection Measurement Size
A 1/4” NPT connection size doesn’t have the 1/4” measurements where you think they would be. In fact, the connection’s
Variable Motor Speed Control
An alternative to control valves for adjusting fluid flow is to regulate the speed of the machine(s) motivating fluid to
Procedure for Crimping the Connector
Procedure for crimping the connector: For tubing we used double compression type fitting. Following are the procedure for the tubing:
How to make RJ45 cable
RJ45 cable is used for connect the ALL HMI and engineer station through a switch to communicated each other. It
Advantages and Disadvantages of Pneumatic Instruments
Advantages and Disadvantages of Pneumatic Instruments The disadvantages of pneumatic instruments are painfully evident to anyone familiar with both pneumatic
4-20mA Transmitter NAMUR Signal Levels
One of the intrinsic benefits of a “live zero” analog signal standard such as 4-20 mA is that a wire
2-wire Transmitters Current Loops
2-wire (“loop-powered”) transmitter current loops It is possible to convey electrical power and communicate analog information over the same two
4-wire Transmitters Current Loops
4-wire (“self-powered”) Transmitter current loops DC electric current signals may also be used to communicate process measurement information from transmitters