Transmitter – Categories & Physical parameters

ØTwo basic categories are:

•Analog

•Digital

Ø

ØThe physical parameters that are monitored in a process are

•Temperature

•Level

•Pressure

•Flow

•Chemical Analysis

•Speed

ØOther parameters are Position (Linear & Angular), Vibration, weight…Etc.

Transmitter – Important points

ØCorresponding to each of the above there is a transmitter

ØEvery transmitter has a corresponding sensor and a transducer

ØThe output signal of the transducer will be low and it is conditioned and processed

ØThe transmitter converts this signal into standardized forms either 4-20 mA or 3-15 psi

ØIf digital signals are being used, the transmitter converts the signal to digital

ØIf it is a smart device the transmitter may convert the signal into two signals, both

analog & a digital signal. Smart devices also have the ability to superimpose a digital

signal over an analog signal.