Yokogawa EJX930A - Manual (Page 161)

<Appendix 8. Advanced Diagnostics>
A8-17
IM 01C25T02-01E
A8.2.13 Checklist
Fill out the below checklist according to the operation flow of the ILBD in order to keep the important
information for the blockage detection.
Checklist (1/5)
No. Items Parameters Result Example
1 Enable Analog Alert to Be Generated
• Uncheck the checkbox of “Diag Alm
Disable” in ALARM_SUM.
ALARM_SUM (Index: 2063)
“Diag Alm Disable”

2 Priority Setting of Analog Alert
• Enter a value of more than 3 to DIAG_
PRI. (3 is recommended.)
DIAG_PRI (Index: 2068) 3
3 Stability of PRIMARY_VALUE
(differential pressure/pressure) under
normal condition
• Check that the status of PRIMARY_
VALUE is “GOOD”.
• Check the maximum and minimum
values of PRIMARY_VALUE.
Status Good
PRIMARY_VALUE (Index: 2014) Max.:
Min.:
Max.: 12.3 kPa
Min.: 12.1 kPa
4 VALUE_FDP under normal condition
• Check that the value of VALUE_FDP is
more than 7×10 -10 .
VALUE_FDP (Index: 2086) 
5 Start to obtain Reference values
• Set Reference to DIAG_MODE.
DIAG_MODE (Index: 2066) 
6 End of Reference Value Sampling
• Check that DIAG_MODE is
“Calcuration”, after the time set to
DIAG_PERIOD passed.
DIAG_MODE (Index: 2066) 
7 Alarm setting
• Record the status of Checkbox in
DIAG_OPTION.
DIAG_OPTION (Index: 2072)
A Blocking  
Large Fluctuation of Low Side  
Large Fluctuation of High Side  
Low Side Blocking  
High Side Blocking  
B Blocking  
Invalid Ref BlkF  
Invalid Ref fSPh  
Invalid Ref fSPl  
Invalid Ref fDP  
Outside Diagnosis Range  
Reflect Blockage to PV/SV/TV
Status
 