FAHM ULM84 Series, Руководство пользователя

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Ultrasonic Level Transmitter
ULM84 Series User Manual
Dec.2020
Page 19 of 21
www.faraboard.com
FAHM Co.
Industrial Automation
Doc. ULM84 Rev.99-12
If the above is done correctly, the amount of liquid level according to the figure is 7 meters above the
reference level and the read number of the equipment up to the liquid level will be 2 meters; therefore,
the 9 must be considered for the probe level of the transmitter.
With the above explanations, the tank equipment parameters of Figure 23 are set as follows.
Table 8 - Setting parameters of the first sample tank
Parameter Description Value Parameter No. (Name)
Maximum Liquid Level to Reference Point, with Current Output of 20 mA +8 meters P02 (20 mA Setup)
Distance between Transmitter’s Probe to the Reference Point +9 meters P04 (Probe Height)
Minimum Liquid Level to Reference Point, with Current Output of 4 mA 0 (Zero) P49 (4 mA Setup)

Define Level Parameters of Sample Tank #2
In this example, a 12-meter wall can be seen that has a depth of about 9 meters underground and also its
height from the ground is more than 3 meters.
This time the surface of the earth is considered as a reference point; Also, according to the information
we have from the liquid, we know that the changes in the liquid level are in a range of 9 meters, which is
a maximum of one meter above the ground (maximum level: +1 meters) and its minimum depth will not
get less than 8 meters below the ground (minimum level: -8 meters).
Figure 24- Second sample tank
Also, the current level of the liquid determined by other means is 50 cm below the ground (so the current
level of the liquid is -0.5 m); Also, when the equipment is turned on, it will show a distance of 3.5 meters
for the transmitter probe to the liquid level; Thus the value to be considered for the probe level parameter
is the sum of these two values; that means:
-0.5 + 3.5 = 3m =
Transmitter’s Distance to
current Liquid Level
(read on the transmitter)
+
Current Liquid Level
distance to the Reference
Point (measured using
other meters)
=
Transmitter’s
Probe
Distance to
the Reference
Point