Yokogawa EJX440A - Manual (Page 70)

A-4
IM 01C25T01-01E
Appendix 2. ILBD Check List
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 4-20 mA Analog Signal Setting
• Select the output mode when an alarm is
generaed.
Diag Out Option
Off:  
Burnout:  
Fall back:  
Diag Fixed Out Val mA 21.6 mA
2 Status Output (option code AL)
DO Select
Pres:  
SP:  
Temp:  
Diag:  
All:  
3 Stability of Pres
(differential pressure/pressure)
under normal condition
• Check that the status of Pres is “GOOD”.
• Check the maximum and minimum values of
Pres.
Status Good
Pres
Max.:
Min.: Max.: 12.3 kPa
Min.: 12.1 kPa
4 fDP under normal condition
• Check that the value of fDP is more than
7x10 -10 .
fDP  
5 Start to obtain Reference values
• Set "Reference" to Diag Mode.
Diag Mode  
6 End of Reference Value Sampling
• Check that Diag Mode is “Calculation” after
the time set to "Diag Period" passed.
Diag Mode  
7 Alarm setting
• Record the status of Checkbox in Diag
Option.
Diag Option
A Blocking  
Large Fluct L  
Large Fluct H  
L Side Blocking  
H Side Blocking  
B Blocking  
Invalid Ref BlkF  
Invalid Ref SPH  
Invalid Ref SPL  
Invalid Ref DP  
ILBD over range  