Honeywell Sensing and Control is one of the world's largest single source suppliers
of sensors and switches.
Advantage
Page for:
- Product Manuals
- Product Drawings
- Configurators
- Software
- Latest Catalog
- And More
|
|
Honeywell Sensotec Frequently Asked Questions |
What are the advantages and disadvantages of having an internal
amplifier on a pressure detector?
Systems without internal amplification must receive supply voltage from
an external source, and must send low level signals (ie. millivolt signals)
back to the amplifying source, sometimes from a long distance.
External Amp sends supply power a long distance and receives the small (30
mV) transducer signal from a long distance
The long distances experienced in some applications can create problems
for unamplified transducers. The output signal can be degraded by external
noise sources.
Transducer signals may become distorted Internal amplification can minimize
these effects.
Internal amplifiers are housed in the same unit as the sensor.The transducer
output is amplified and therefore a much larger signal 0 - 10V.
Internally amplified transducers provide a high level output
This ensures that the induced electrical noise is a couple of orders of
magnitude smaller than the amplified signal and therefore creates a higher
signal to noise ratio. The larger output also allows A/D converters to create
a higher resolution input. The amplifier outputs are low impedance, and
internal amplifiers don't contribute noticeably to system inaccuracy.
Amplified output with a much higher signal to noise ratio
Internal amplifiers may not be feasible under certain conditions. Specifically,
the circuitry in the amp can not be subjected to extreme temperatures. If
sensor placed in a location inaccessible to users (hazardous environment,
small space, long distance), zero and span adjustments may not be able to
be tweaked when needed. Internal amplifiers increase the overall size of
the unit, which may be concern in some applications.
|
Offline
Download our new FAQ
document for a hardcopy of more than 100 FAQs at your fingertips.
Online
Select a category below, or use the keywords section to explore our
online "experience" database. |
|
