Ultrasonic Level Transmitter
ULM84 Series User Manual
Dec.2020
Page 13 of 21
FAHM Co.
Industrial Automation
Doc. ULM84 Rev.99-12
For example, in Figure 19 there is an obstacle whose distance to the bottom of the transmitter probe is L₁;
therefore, the "P06 Dead Band" parameter must be set to L₁ or slightly more; thus, the equipment will
ignore the above obstacle
.
It is important to note that if the distance from the barrier to the equipment is less than its default dead
band, the transmitter may not have the correct measurement.
Define Length Measurement Unit (
P07 Length Unit)
Depending on the need, the user can select the desired unit of length.
Define Volume Measurement Unit (
P08 Volume Unit
)
Depending on the need, the user can select the desired volume unit; this menu will be activated if in the
"P01 Device Mode" menu the quantity Mass or Volume are selected to be measured.
Define Mass Measurement Unit (
P09 Mass Unit
)
Depending on the need, the user can select the desired unit of mass; this menu will be activated if in the
"P01 Device Mode" menu the quantity Mass is selected to be measured.
Define Density Measurement Unit (
P10 Density Unit
)
Depending on the need, the user can select the desired unit of density; this menu will be activated if in
the "P01 Device Mode" menu the quantity Mass is selected to be measured.
Define Density Value (
P11 Density
)
This menu will be activated if in the "P01 Device Mode" menu the quantity Mass is selected to be
measured; In this case, the user defines the Density value here.
Define Volume Calculation Mode based on Level (
P12 Volume Calc. Mode
)
This menu will be activated if the quantity to be measured in Volume or Mass is selected, and in this case,
depending on the physical condition of the tank and the user's opinion, here you can define how to
calculate the volume by the liquid level.
In this menu, two methods can be selected to calculate the volume by level; If the direct calculation method
is selected, the user must specify the height and volume of the tank for a desired situation as an example
in menus 13 and 14, respectively; In this way, a constant coefficient between volume and surface will be
determined, which is sufficient to calculate the volume at any moment. The level detected by the
equipment is multiplied by this value to determine and display the corresponding volume.
But in the second method, for reasons such as the asymmetry of the shape of the tank, the user prefers to
determine the volume of the liquid based on the detected level according to the lookup table (which is also
provided by the user); If you select this method, menu number 15 is activated, which is described below
.
Define Sample Level (
P13 Tank Height
)
If in the previous menu, the direct method of calculating the volume by level is selected, this menu and
menu 14 are activated, in which case the user must provide a pair of desired level and volume as an
example; apply the level value in this menu and the volume value in the next menu.
Define Sample Volume (
P14 Tank Volume
)
If in menu 12, the direct method of calculating the volume by level is selected, this menu and menu 13 are
activated, in which case the user must provide a pair of desired level and volume as an example; Apply the
level value in menu 13 and the volume value in this menu.
