Flowlink 5.1 Software Instruction Manual - Isco

Isco Flowlink 5.1 ® Software
Site Window - 4100/4200/6700
• Variable Blanking is only applicable to Ultrasonic
instruments. Enter the variable blanking distance.
Minimum depth for velocity Box - displays Minimum depth
for velocity. This setting is only applicable for area velocity
instruments with a standard or extended range sensor.
Set flow rate to zero if no velocity data Check box - controls
what an area velocity flow meter stores as flow rate readings
when it is unable to measure velocity.
View last Box - Contains three buttons, Report, History, and
Program. These buttons are active if a text file was downloaded
during the last data retrieval. This communication option must
first be enabled.
Password Box - Reports the current status of the instrument’s
password protection and provides buttons to change and remove
the password.
Totalizers Box - Contains two buttons to reset the totalizers to
zero.
• Zero Total Flow button resets the cumulative flow
reported in the Measurements tab of the Site Window.
• Zero Sampler Enable Total Flow button resets the
sampler enable flow count to zero.
Press the Configure Like Another button to configure the
current site so it has the same settings as another. (The site
name will not be changed.) After pressing the button, you will be
prompted to select a site from the Select A Site dialog box. Select
the appropriate site and click OK.
Variable Blanking
Minimum depth for
velocity
Ultrasonic instruments can vary the blanking to avoid erroneous
level readings. Proper selection of a value will ensure that the
flow meter accepts only valid echoes from the surface of the
liquid, while disregarding invalid returns from the walls, sides of
the channel, manhole rungs, or other obstructions.
Enter this value as the distance from the face of the ultrasonic
level sensor to the maximum expected liquid level. Refer to the
instrument’s instruction manual to calculate this distance. The
flow meter will then ignore any echo reflected from this distance
or less. Keep in mind that if the liquid level rises into the
variable blanking distance, the flow meter will ignore the return
from the liquid surface.
For area velocity instruments with a standard or extended range
sensor, this sets the minimum depth for measured velocity
readings. Below this level, the flow meter approximates the
velocity using earlier readings, and will not be able to detect the
direction of flow. Refer to the instrument’s instruction manual to
determine the correct setting.
Area velocity flow meters using a low-profile sensor do not
require a minimum depth setting. Low profile sensors always use
one inch (25 mm).
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