Kistler-Morse KM ultrawave - Manual (Page 60)

• Enable — turns linearization on and off.
• Number of points — allows you to select the number of points to input for the linearization (32 maximum
points).
Contact Kistler-Morse for technical assistance in calculating linearization parameters. 27 Speed O Sound
The Speed O Sound Menu allows you to monitor and adjust the value for the speed of sound, which is used by
the UltraWave Series controller in the calculation of range. The default value for speed of sound is based on the
sound pulse traveling through air. At 68° F [20° C], the speed of sound is approximately 1127 ft/sec [344 m/sec].
Note that the controller automatically adjusts the speed of sound for temperature based on the information from
the temperature probe (if installed) or the fixed temperature input (see Chapter 5, Calibration Menu). In the Speed
O Sound Menu, an adjustment is made based on the medium of sound travel — the material that the pulse is
traveling through above the material actually being measured. Speed O Sound has three submenus:
• Automatic Entry — this menu allows you to input a correction distance for the speed of sound. For
example, if you know there is 3 feet of material in the vessel but the controller is displaying 4.2 feet
because the medium is not standard air, input 3.0 ft for Auto. The controller takes that distance and uses
it to automatically calculate a correction factor, in percent, for the speed of sound.
• Manual Entry — this menu allows you to input a correction factor, in percent, for the speed of sound. For
example, if the speed of sound through the medium is only 95% of the speed of sound in air, enter 95%
for Manual Entry.
• Monitor — this menu allows you to view the current value for speed of sound.
Note: Kistler-Morse recommends this only be changed by authorized personnel.
28 tPP (trAnsMissions Per Point)
In a multipoint system for liquids, TPP sets the number of transmissions on each point prior to advancing to the
next channel. For a vessel with rapidly changing conditions, it can be helpful to send out several transmissions
in a row to get an accurate reading before the controller moves on to the next channel. TPP can range from 1 to
255. The default is 1.
30 relAy set Pt
The setpoint value is the measured value where you wish a device (for example, a pump) to activate or
deactivate. The setpoint setup functions for each channel are accessed in this menu. They include adding
and deleting set points and selecting activation values, high or low activation, deadband values, and fail-
safe parameters. In addition, for flow applications, set point setup includes selecting what parameter triggers
activation (flow, head, total, time, or temperature) and the amount of time for pulse activation.
Figure 21: Relay Set Point Menu Tree
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