Thursday, June 27, 2013

Damping Adjustment -I

The vast majority of modern process transmitters (both analog and digital) come equipped with a
feature known as damping. This feature is essentially a low-pass filter function placed in-line with
the signal, reducing the amount of process “noise” reported by the transmitter.
Imagine a pressure transmitter sensing water pressure at the outlet of a large pump. The flow of
water exiting a pump tends to be extremely turbulent, and any pressure-sensing device connected
to the immediate discharge port of a pump will interpret this turbulence as violent fluctuations in
pressure. This means the pressure signal output by the transmitter will fluctuate as well, causing any
indicator or control system connected to that transmitter to register a very “noisy” water pressure:

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