Gf-signet 2551 Magmeter Flow Sensor - Display Manual de usuario descargar pdf (Pagina 11)

112551 Magmeter

Sensitivity

• The SENSITIVITY setting determines how the 2551 responds

to sudden surges in the  ow rate. It "overrides" the Averaging

function just long enough to allow an actual change in  ow rate

to be displayed, then resumes the averaging. The result is a

smooth  ow display and a quick response to large shifts in the

 ow rate.

The settings for Sensitivity represent a percentage of the

magmeter's maximum range, or 10 milliseconds (ms).

Example: A sensitivity setting of 25% means that the  ow rate

must change instantly and by more than 2.5 ms before the

function is enabled.

NOTE: The SENSITIVITY function is ineffective if the AVERAGING

function is set to zero.

No Averaging

With AVERAGING set to zero, the  ow rate will be displayed

immediately and with no  ltering. This line represents the

actual output of the  ow sensor as it responds to unstable  ow

conditions in the pipe.

Averaging Only

With AVERAGING set to 50 seconds and SENSITIVITY still set to

zero the  ow rate is stabilized, but a sharp change in  ow rate is

not represented on the display or at the output for 50 seconds or

longer.

Averaging and Sensitivity

With AVERAGING at 50 seconds and SENSITIVITY set to

25%, the  ow rate is stabilized, while the sudden shift in  ow is

re ected very quickly.

Averaging

• The AVERAGING setting dictates the time over which the

magmeter will average the  ow signal.

The LCD display is updated every second. With averaging at

14 seconds, the  ow rate on the display is an average of the

previous 14 seconds input.

Short averaging times provide the fastest display and output

response to changes in the  ow rate.

Higher averaging times help to smooth the display and current

output where the  ow in the pipe is erratic or unstable due to

installation limitations.

10 s 20 s 30 s 40 s 50 s 60 s 70 s

Time

Velocity

10 s 20 s 30 s 40 s 50 s 60 s 70 s

Time

Velocity

10 s20 s30 s40 s50 s 60 s70 s

Time

Velocity

Even the most carefully engineered  ow systems may experience

erratic and unstable conditions. If the instability is communicated

to the output functions, the results may create problems for

control devices.

To alleviate these issues, the 2551 provides two adjustments that

operate in tandem. The information here will help in determining

the appropriate settings for any speci c application.

7.1 Averaging and Sensitivity

CAUTION

The SENSITIVITY function changes the response

characteristics of the magmeter. If used as part of a

tuned closed loop control system, such a change may be

undesirable.

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Gf-signet 2551 Magmeter Flow Sensor - Display Manual de usuario Pagina 11

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