The Enginstrel Engematic 640 series gauge, differential, absolute, and level pressure transmitter is a two-wire transmitter that receives the pressure signal and converts it into a 4 to 20mAcc electronic signal, proportional to the pressure signal.

The transmitter uses a fully sealed capacitive sensor, which eliminates mechanical stress transfer and consequently problems with vibration and shock. Damping of the input signals is done electronically, as well as "Zero" and "Span" adjustment. The interconnecting terminals and separate circuits ensure that the electronics remain isolated even during installation.