FAHM ULM84 Series, Руководство пользователя

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Ultrasonic Level Transmitter
ULM84 Series User Manual
Dec.2020
Page 4 of 21
www.faraboard.com
FAHM Co.
Industrial Automation
Doc. ULM84 Rev.99-12
serial number on startup and starts to search the level at the same time. Next, while still keeping the
searching operation on, it displays the HART identification number (default to 00) and in case the search
succeeded, calibration operation follows.
FAHM Co. Instruments
Model ULM84
MID: 00
Calibrating …
Figure 6- Second screen on start-up
The intention of calibration is to detect and adjust the best power and frequency of the sent wave after it
initially detected the level. After these stages, if no problems detected, the screen display the status as
illustrated in the following figure, according to pre-selected display mode.
x R0000 D08 S0
METER 4.714 Level:
METER 5.286 Dist:
11.542 mA
Figure 7- One display mode in normal situations
If the device fails to identify the level correctly, following screen would be displayed.
x R0000 D08 S0
Error NAN Level:
Error NAN Dist:
00.000 mA
Searching …
Figure 8- Error NAN display mode
The following reasons may also cause to display one of errors in Figure 9.
a. If the time passed the last level detection by the transmitter is more than Alarm Time 1 and the
transmitter couldn’t detect the level anymore, the left screen of Figure 9 would be displayed.
b. If because of defect in the sensor itself or its connecting cable, the transmitter failed to reach the
sensor in specified Alarm Time, the middle screen of Figure 9 would be displayed.
c. If the level distance to transmitter gets shorter of defined Safety Distance 2 and the Alarm Time is
passed, the right screen of Figure 9 would be displayed.
Note: in any of mentioned cases, the transmitter alerts the alarm as configured by P41 (Alarm Output)
parameter, in addition to displaying the screens.
Error
Safety Range!
Error
Sensor Board!
Error
No Echo!
Figure9- Error Screens of No Echo (left), Sensor Board (middle) and Safety Range (right)
6. Keyboard
Figure 10 displays the transmitter’s keyboard alongside with the display. More explanations follows.
1
P42 Alarm Time: Which defines after how long after of occurring alarm conditions the transmitter should alarm.
2
P48 Safety Dist.: Which defines valid distance between the liquid level and the transmitter’s probe.