Siemens sitrans LU01 - Manual (Page 89)

7ML19985BE02 SITRANS LU01 – INSTRUCTION MANUAL Page 83
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Measurement (P920 to P927)
Use these parameters to verify programmng, when performing a dynamic material level
test over at least 2 empty/fill cycles for each vessel is impractical. The parameters below
will display the corresponding Reading in the Parameter Value field, will set the mA
output value accordingly, and will set the relay status accordingly.
To take an ultrasonic measurement, access one of the following parameters, and press
(repeat five times to overcome Echo Lock, P711).
Alternatively, press ENTER to simulate a rising and falling material level. During the
simulation, the LU01 will operate as though the material level was repeatedly cycling from
full to empty to full, and so on, at a rate of 1% of Span (P007) per second. See Lock (P000)
to activate control relays during simulation.
The simulation starts at level = 0, unless a specific level was entered.
Press to switch to the rising (or for emptying) simulation as required. Holding the
key increases (or decreases) the simulated rate of rise (or fall) to 4% of Span per second.
Press to end simulation.
During a measurement or simulation, the LU01 responds as though in the RUN mode, but
the value displayed in the Reading field is affected by the Measurement Paramter
selected, and the material level is displayed in the Auxiliary Reading field.
P920 Reading Measurement
Corresponds to the final reading after all programming is applied.
P921 Material Measurement
The distance in Units (P005) or % of Span (P007) between Empty (P006) and the
monitored surface.
P922 Space Measurement
The distance between the monitored surface and Span (P007).
P923 Distance Measurement
The distance between the monitored surface and the transducer face.
Note: If measurements or simulation are desired, but the LU01 operation has not
been verified, disable all associated process control equipment before accessing
the following parameters.