GF Signet 2537, Instruction Manual

Page: 9 / 16

9 Signet 2537 Flowmeter
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2s
2s
x2
x5
1.
2.
3.
4.
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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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 # ow. The dashed
red line represents the actual output of the # ow sensor in unstable
# ow conditions.
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 for 50 seconds or longer (dotted green line).
With AVERAGING at 50 seconds and SENSITIVITY set to 4 OR 5,
the # ow rate is stabilized, while the sudden shift in # ow is re # 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 # ow conditions are often impossible to achieve, the # 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 # 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 # ow in the pipe is erratic.
Quick Response Sensitivity (Factory set: 0)
• Set the relative degree of change in the # ow rate required to allow the 2537 to disable the AVERAGING and jump to a new # ow rate
immediately. The scale is from 0 (least sensitive, averaging is never disabled.) to 9 (a very small change in # ow rate will disable the
averaging).
The factory setting is 0 (zero). The factory setting is 0 (zero).
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