What type of sensor do you use in your Series 420 transducers and transmitters?
Barksdale uses diffused silicon sensor technology because it provides the best combination of long term stability, accuracy, compact size, price, and shock and vibration resistance. The diffused silicon sensor consists of a silicon crystal diaphragm. The crystalline structure is inherently more stable than a metal diaphragm or beam, assuring consistent output after years of service or wide pressure fluctuations.
Are they field adjustable?
The N1 versions have adjustable zero and span. An optional 2:1 turn down capability gives you the ability to use one transducer in many different applications, increasing flexibility and reducing inventory costs.
What is the difference between a "transducer" and a "transmitter?"
A pressure transducer is typically a millivolt or voltage system which converts input pressure into low-level electrical/electronic signals. These signals, however, are not suitable for transmission over long distances.
A pressure transmitter is a current loop instrument which incorporates an electronic amplifier and pressure sensor into one package, allowing measurement signals to be transmitted over long distances without loss of accuracy or the introduction of electrical noise. Transmitter output signals are typically 4-20 mA analog. For more information, download our article reprint "How to Select a Pressure Transducer."