Yokogawa EJX930A - Manual (Page 53)

<4. Diagnostics>
4-3
IM 01C25R02-01E
NOTE
Time Stamp is reset when powering on.
(5) Configuration Change Counter
The Configuration Change Counter is
incremented once for every user action
that changes the device’s configuration or
calibration. This value is never reset or written
and maintained even if power is removed from
the device.
• Procedure to call up the display using DD
(HART 7) and DTM (HART 7)
DD (HART 7)
DTM (HART 7)
[Root Menu] → Diag/Service →
Status →
→ Cfg chng
count
The configuration change times
are counted. The counted value
cannot be reset.
(6) Reset Configuration Changed Flag
Configuration Changed Flag can be reset by
this method.
NOTE
Refer to Configuration Changed (0x40) in the
Table 4.7.
• Procedure to call up the display using DD
(HART 7) and DTM (HART 7)
DD (HART 7)
DTM (HART 7)
[Root Menu] → Diag/Service →
Status → Reset Cfg Chng flag
4.2 Advanced Diagnostics
4.2.1 Multi-sensing Process Monitoring
Multi-sensing process monitoring function (option
code: /DG6) provides the advanced diagnostics
to detect the abnormal conditions in process
environment such as an impulse line etc. by using
the EJX multisensing technology and its unique
algorithm. There are following two functions.
 Impulse Line Blockage Detection (ILBD)
The fluctuation change of differential pressure and
static pressure is monitored by a silicone resonant
sensor and detects a potential blockage condition.
The differential pressure transmitter gives also a
result of which pressure-side was plugged.
 Heat Trace Monitoring
The two temperature sensors built in the EJX
multivariable transmitter calculate the flange
temperature, the change of which enables to
detect the heat trace breakage or the abnormal
temperature due to the failure.
4.2.2 Impulse Line Blockage Detection
(ILBD)
ILBD is carried out by using statistical analysis
based on the measured values of process
fluctuations that exist in a fluid. An alarm on the EJX
multivariable transmitter LCD display or an analog
alert is generated if blockage reaches a certain
level. EJX multivariable transmitter provides the
following results as blockage detection.
(1) A Blocking and B Blocking
These are blockage detections based on
the fluctuation value change of differential
pressure/pressure. With a differential pressure
transmitter, each result indicates that both or
single side is plugged.
(2) L Side Blocking
It is a low-pressure side blockage detection
based on the change of BlkF or low-pressure-
side fluctuation value.
(3) H Side Blocking
It is a high-pressure side blockage detection
based on the change of BlkF or high-pressure-
side fluctuation value.
*: BlkF indicates blockage degree characterized
by a comparison of the high- and low-pressure-
side fluctuation values. For the details, refer to
Figure 4.2.2.