YOKOGAWA DPharp EJX***A Series User Manual

<4. Diagnostics>
4-15
IM 01C25T01-06EN
Table 4.4 Requirements to apply ILBD
Condition
fDP 7×10
-10
or more
fSPI 1×10
-10
or more
fSPh 1×10
-10
or more
BlkF -0.5 to 0.5
 fDP is not enough.
No blockage can be detected if fDP is not larger
than the specied value.
 Only fDP is enough.
“A Blocking” or “B Blocking” can be detected
if fSPl and fSPh are not larger than specied
values.
 fDP and fSPl are enough.
“H Side Blocking” and “Large Fluct H” can not
be detected if fSPh is not larger than specied
value.
 fDP and fSPh are enough.
“L Side Blocking” and “Large Fluct L” can not
be detected if fSPl is not larger than specied
value.
 fDP, fSPl and fSPh are enough.
All alarm modes can be detected even if BlkF is
not within the specied values.
4.2.2.7 Obtain Reference Values
The pressure uctuation values are reduced
when the impulse line is plugged. Therefore, the
reference value is required to determine the degree
of reduction.
IMPORTANT
• If the impulse line is about to be plugged at
the time when a reference value is obtained,
blockages cannot be detected accurately.
The impulse lines on both the high-pressure
and low-pressure sides need to be cleaned
before a reference value is obtained.
• All air bubbles need to be adequately purged
before a reference value is obtained.
• Reference values must be obtained under
operating condition.
 Start of Sampling
The sampling of reference value is carried out for
180 seconds, which is the default value set to Diag
Period.
1) Conrm that the sampling period (Diag Period)
is set to 180 seconds.
2) Set “Reference” to Diag Mode.
The sampling starts soon after the setting.
IMPORTANT
• For the each parameter, the one value is
given. If Reference is set to Diag Mode
again, the value is updated and overwritten.
• If the power supply is shut down during the
sampling, Diag Mode becomes “Stop”. Set
“Reference” to Diag Mode in order to carry
out the sampling again.
 End of Sampling
After about 180 seconds, the sampling
automatically nishes. The “Reference” setting of
Diag Mode moves automatically to “Calculation”.
Conrm that the setting of Diag Mode moves to
“Calculation”.
 Reference Values
Conrm the latest values are obtained into the
following parameters.
• Ref fDP
• Ref fSPl
• Ref fSPh
•RefBlkF
• Ref DPAvg
• Procedure to call up the display
DD and DTM
(excluding EJX_
HART 5[1.2])
[Root Menu] → Diag/Service
→ Diag Parameters → ILBD
parameters → Status → Diag
Reference → Ref fDP/Ref fSPl/Ref
fSPh/Ref BlkF/Ref DPAvg
EJX_HART 5[1.2]
DTM
Diag and Service → Advanced
Diag Conguration → Impulse Line
Blockage Detection → Ref fDP/Ref
fSPl/Ref fSPh/Ref BlkF/Ref DPAvg

YOKOGAWA DPharp EJX***A Series Specifications

General

Brand	YOKOGAWA
Model	DPharp EJX***A Series
Category	Transmitter
Language	English