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3.2.1 360 Level
Figure 3-4 Blanking distance for LaserFlow Ex with built-in sensor or with
remote ultrasonic sensor
3.2.2 360 Velocity
3.2.3 LaserFlow Ex Velocity
Advanced Settings
TIENet™ 360 LaserFlow Ex™ Velocity Sensor
Section 3 Setup with Signature® flowmeter
The Minimum Blanking Distance is the distance from the
bottom of the sensor to the liquid surface at the highest expected
level. Depending on the elevation of your sensor, this value may
be increased to help ensure that echoes read by the flowmeter
come only from the surface of the flow stream, and not off the
walls or sides of the channel.
The Maximum Blanking Distance is the distance between the
bottom of the sensor and the bottom of the channel (i.e., zero
level). A larger value than calculated can be entered.
If using the LaserFlow Ex module with the 310 remote ultrasonic
sensor and horizontal sensor mounting bracket, the maximum
blanking distance is the distance between the bottom of the
mounting bracket and the bottom of the channel.
Minimum Blanking
Maximum Expected Level
Bottom of Channel
When the Measure Positive Velocity only option is selected,
the LaserFlow Ex will not attempt to determine flow direction.
The LaserFlow Ex Advanced Settings are pre-programmed
into the sensor. However, if your application requires any custom
configuration, the Advanced button opens the Advanced settings
window (refer to Figure 3-5).
Input Velocity Coefficients – The relationship of the three
Input Velocity Coefficients A, B and C can be expressed as:
V = A (offset) + B*(Measured Velocity) + C*(Measured Velocity)
Coefficient A is an additive offset value to correct the Measured
Velocity for any additive bias. The value for A must be expressed
in units of meters/second. The default is "0".
Maximum Blanking
2
3-5
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