7ML19985AN02 SITRANS LU10 – INSTRUCTION MANUAL Page 89
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Technical Reference
Example 3 - mA Multi-point Average
This mode of operation may be used for bunkers with multiple material discharges and
tank farms where several tanks contain the same material. As well as monitoring the
amount of material in each bunker section (or tank) a mA output representing the
average measurement may be used to calculate total material or remaining capacity.
For this example we’ll assume the following:
• the bunker is 150 ft long by 60 ft deep max. and has 6 sections with individual
discharge outlets.
• the maximum filling/discharge rate for each bunker section is 3 inches per
minute.
• an XLS-30 transducer is mounted 65 ft above each discharge outltet.
• a mA output proportional to each bunker section material level is required by the
PLC.
• a mA output proportional to the average material level is required for total
material calculation.
• if a measurement difficulty occurs for greater than 2 minutes, 3.8 mA is required
by the PLC.
• the XLS-30’s are connected to the Transducer 1 to Transducer 6 terminals.
• an LU AO is connected to the SITRANS LU10 Peripheral Communications
Terminals.
Parameter Settings For Point # 00 (Points 1 - 10)
P001 Operation Enter "1" for level
levellevel
level.
P002 Material Enter "2" for solid.
solid.solid.
solid.
P003 Measurement Response Enter "1" for slow,
slow,slow,
slow, 0.1 m/min (4 in/min).
P004 Transducer Enter "109" for XLS-30
XLS-30 XLS-30
XLS-30.
P005 Units Enter "4" for feet.
feet. feet.
feet.
P006 Empty Enter "65" for transducer face to Empty equals
65 ft.
65 ft.65 ft.
65 ft.
P007 Span Enter "60" for max material level equals 60 ft
60 ft60 ft
60 ft.
P070 Failsafe Timer Enter "2" for 2 minutes
2 minutes2 minutes
2 minutes
Point Numbers
(10 max)
mA Output #1234567 (avg.)
mA Output Value 14 mA 4 mA 7 mA 8 mA 16 mA 18 mA 11.2 mA
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