YOKOGAWA DPharp EJXC40A, Руководство пользователя

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<7. HART Communication>
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IM 01C25W05-01EN
7.3.2.2.11 Resetting the Reference Value
If the flow rate is changed greatly or if the fluid is changed during plant operation, acquire the reference value
again. If the flow rate changes by 25% or more relative to the flow rate that was present when the reference
value was acquired, acquire the reference value again.
When resetting the reference value, perform impulse line block purging as much as possible.
7.3.2.2.12 ILBD Parameter List
# Parameter name
Factory default
value
Description
1 Diag Error 0x0000 The results detected by ILBD or heat trace monitoring are stored in this
parameter. Also the condition abnormality in the diagnostic process is
stored as an error.
2 Diag Option 0x08f8 Use this parameter to select the error messages and status to reflect in
the LCD and output signals. The errors assigned to each bit correspond to
the bits of Diag Error.
This parameter is selectable only when Diag Mode is set to Stop.
3 Diag Out Option Off Error status can be output with the 4 to 20 mA analog signal.
The available three output modes are Off, Burnout, and Fall back.
4 Diag Fixed Out Val 21.6 mA A parameter for the fall back function in Diag Out option.
This specifies the output value of the 4 to 20 mA analog signal when
alarms occur. The value can be entered in the range of 3.8 to 21.6 mA.
5 Diag Mode Stop This parameter sets the ILBD operation mode.
Stop: Blockage detection is stopped.
Calculation: Block detection is executed.
Alarms are generated on the basis of detection results.
Reference: The reference values are set to the latest blockage detection
data.
When the reference values are updated, the mode automatically switches
to Calculation.
6 Diag Period 180 (sec) This parameter sets the data sampling period for ILBD in the range of 20
to 65535 seconds.
If the process fluctuation values are unstable, increasing the sampling
period may improve the diagnostic accuracy.
This parameter can be entered only when Diag Mode is set to Stop.
7 Diag Supp Count 3 Detection count to generate an alarm.
8 Diag Description Memo field. Up to 32 alphanumeric characters can be entered.
9 fDP Average value of the sum of squares of differential pressure fluctuation.
10 fDP Status Status of fDP
11 fP2 Average value of the sum of squares of module 2 side fluctuation.
12 fP2 Status Status of fP2
13 fP1 Average value of the sum of squares of module 1 side fluctuation.
14 fP1 Status Status of fP1
15 BlkF The blockage level obtained by comparing the pressure fluctuation
between the module 1 side and module 2 side.
16 BlkF Status Status of BlkF
17 DPAvg Ratio of the average of differential pressure to the maximum span
18 DPAvg Status Status of DPAvg
19 Ratio fDP Differential pressure RMS compare value
20 Ratio fDP Status Status of Ratio fDP
21 Ratio fP2 Module 2 side pressure RMS compare value
This is used to detect blockage in the module 2 side impulse line.
22 Ratio fP2 Status Status of Ratio fP2
23 Ratio fP1 Module 1 side pressure RMS compare value
This is used to detect blockage in the module 1 side impulse line.
24 Ratio fP1 Status Status of Ratio fP1
25 Ref fDP Value of fDP obtained under steady state operation used as a reference
for blockage detection.
26 Ref fDP Status Status of Ref fDP