SIMPLE LEVEL APPLICATION
The most common application of a Milltronics ultrasonic level measuring system is for
simple level monitoring, whereby the material level or space measurement is
displayed. This may or may not include alarms and mA output.
When in the program mode, alarm relays hold their contact state. However, they will
respond to measurements taken when "MEAS" is pressed.
Simple Level Example
The application is to obtain a level measurement and corresponding 4-20 mA output
of a 30 ft high vessel. The transducer face is level to the top of the vessel, the empty
level will be at 0 ft ( bottom ) and the full level will be at 28 ft from the bottom ( span ).
A high alarm is required at 4 ft from the top ( 26 ft from the bottom ) and a low alarm is
required at 5 ft from the bottom. The maximum emptying rate is 1 ft / min, a rate
greater than this should set an alarm. In the event of a loss of echo, the MultiRanger
Plus is to go into fail-safe hold after 2 minutes.
select:
P-1 enter option "3", units in feet
advance to:
P-2 enter option "1", material level
P-3 enter "30", empty distance to transducer
P-4 enter "28", span
P-5 enter ".984", blanking distance , ( use factory setting )
P-6 enter option "2", 4 – 20 mA output
P-7 enter "2", display max 2 digits after decimal
P-8 enter option "1", relay 1 - alarm function
P-9 enter "26", relay 1 - alarm ON ( 30’ – 4’ = 26’ )
P-10 enter "25.5", relay 1 - alarm OFF deadband = 0.5’, arbitrary setting
P-11 enter option "1", relay 2 - alarm function
P-12 enter "5", relay 2 - alarm ON
P-13 enter "5.5", relay 2 - alarm OFF
P-14 enter option"5", relay 3 - rate of change function
P-15 enter "–1", relay 3 - alarm ON 9 ‘–’ denotes emptying
P-16 enter "– 0.9", relay 3 - alarm OFF
P-37 enter "1", convert display ( x1 )
P-68 enter "1", maximum fill damping 1 ft / min
P-69 enter "1", maximum empty damping 1 ft / min
P-74 enter option "3", fail-safe hold
P-75 enter "2", fail-safe timer - 2 min.
to re-enter run mode
RUN
CAL
PL-443 6 – 3
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