The difference between a 2 wire and a 4 wire is the power supply.A 4 wire has 2 wires for power supply and 2 for the control signal. A 2 wire is a 4/20ma transmitter that uses the leakage current thru the load to power the transmitter.IE a 2 wire prox, versus a 3 wire prox.he signal will of course always vary between 4 and 20mA, but not the power wires. The big difference is that a 2-wire transmitter have a higher minimum voltage drop (typically 10V) than the 4-wire transmitter. That means there are more voltage drop availiable for the wire.
Stroking or smoothing his tie or lapel. This is another preening gesture, and it means he is trying to look his best for you. Similar to running his fingers through his hair, this type of body language signifies that he wants you to find him attractive. Standing with his hands on his hips.
Most of studying body language involves tuning into the cues your unconscious mind is already picking up. But you can learn how to read micro-expressions, which last just 1/25th of a second but are impossible to fake â try this training program by Paul Ekman, who discovered them. You could also try filming yourself performing everyday activities to see what impression youâre giving off.