Aalborg TIO, Руководство по эксплуатации, Страница: 45 / 98

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d) NRF Error Limit (Numerical Entry)
The Error Limit value can be selected between 0.0 and 10.0 % F.S. (for
consistency) . The value represents the difference of the signal sample
from previous measured value. The Error Limit is configured to reject
noise spikes within the flow range while allowing normal variation of the
flow signal. The factory default setting 2.0% of full scale optimizes noise
rejection in most applications.
e) Average Filter Damping (Numerical Entry)
The Average Filter Damping parameter is only applicable for Running
Average mode of the Signal Conditioner and its value can be selected
between 0 and 500 ms.The value represents the response time for a
0 - 66 % step flow rate change. When the damping value set to 0, it is
disabled. Factory default value is 200.
f) Flow Linearizer Mode (Tabular Entry)
The Flow Linearization algorithm may be used to improve linearity of the
flow measurement. The default Flow Linearization Table, stored in the
device EEPROM, is linear and does not change input signal. By default
the unit is shipped from the factory with disabled Flow Linearizer.
The flow linearization table calibration can be done using only the
supplied “TIO Configuration Utility” software via digital (RS-232 or
RS-485) interface. It involves building a table of the actual flow values
(EEPROM indexes 98, 100, 102, 104, 106, 108, 110, 112, 114, 116, 118)
and corresponding sensor readings (EEPROM indexes 99, 101, 103, 105,
107, 109, 111, 113, 115, 117, 119). Actual flow and sensor reading
values are entered in normalized fraction format: 100.000 %F.S. corre
sponds to 1.000000 flow value 0.000 % F.S. corresponds to 0.000000
flow value. The valid range for flow values is from 0.000000 to 1.000000
(note: TIO will accept up to 6 digits after decimal point). There are 11
elements in the table so the data should be obtained at an increment of
10.0 % of F.S. (0.0, 10.0, 20.0, 30.0, 40.0, 50.0, 60.0, 70.0, 80.0,
90.0 and 100.0 % F.S.).
Note: Do not alter memory index 98 and 99 (must be 0.0). These
numbers represent zero flow calibration points and SHOULD NOT
BE CHANGED.
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