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 AO-10 is connected to the XPL+ Peripheral Communications Terminals.
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
TECHNICAL REFERENCE
PL-532 91
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