GF Signet 2537 Paddlewheel Flow Sensor - Manual (Page 9)

9 Signet 2537 Flowmeter
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2s
2s
x2
x5
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5.
Set Averaging
Minimum value
Maximum value
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This function is available on
these versions of the 2537:
2s
Go to next
menu item
Return to
Normal Operation
Save the new setting:
Example:
Set the Averaging for 50 seconds.
Set Sensitivity
Minimum value
Maximum value
2s
2s
x3
x5
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P
t
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t
1.
2.
3.
4.
This function is available on
these versions of the 2537:
2s
Go to next
menu item
Return to
Normal Operation
Save the new setting:
Example: Set the Sensitivity to 5.
10 s 2 s 20 s 30 s 40 s 50 s 60 s 70 s
No AVERAGING, no SENSITIVITY
With AVERAGING set to 0 (zero) and with SENSITIVITY set to zero,
the 2537 responds to every unstable shift in the À ow. The dashed
red line represents the actual output of the À ow sensor in unstable
À ow conditions.
With AVERAGING set to 50 seconds and SENSITIVITY still set to
zero the À ow rate is stabilized, but a sharp change in À ow rate is not
represented for 50 seconds or longer (dotted green line).
With AVERAGING at 50 seconds and SENSITIVITY set to 4 OR 5,
the À ow rate is stabilized, while the sudden shift in À ow is reÀ ected
very quickly (solid blue line).
NOTE: The SENSITIVITY function is ineffective if the AVERAGING function is set to zero (seconds).
AVERAGING only
AVERAGING and SENSITIVITY
Averaging and Sensitivity Settings
• Because ideal À ow conditions are often impossible to achieve, the À ow rate is often erratic, which causes erratic readings in control
features (e.g., relays, 4 to 20 mA loops, etc.) that are associated with the À ow rate.
• The best solution to these problems is to correct any piping de¿ ciency that causes the instability. This may involve longer straight
runs upstream, reducing the pipe size to maintain a full pipe at all times, and other installation changes. In many situations, however,
these measures are simply not possible.
• The 2537 meter provides two tools that are designed to "work around" these de¿ ciencies. The Averaging and the Sensitivity features
should be studied before making adjustments.
Averaging Time in Seconds (Factory set: 0 seconds)
• Set the time the meter will use as the averaging period. The range is from 0 (no average applied to input) to 100 (seconds of
averaging applied to input).
Use higher averaging times to smooth the display and current output where the À ow in the pipe is erratic.
Quick Response Sensitivity (Factory set: 0)
• Set the relative degree of change in the À ow rate required to allow the 2537 to disable the AVERAGING and jump to a new À ow rate
immediately. The scale is from 0 (least sensitive, averaging is never disabled.) to 9 (a very small change in À ow rate will disable the
averaging).
The factory setting is 0 (zero). The factory setting is 0 (zero).
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