A-34
Appendix A Maintenance and Troubleshooting of this Device
A5-2-2 Sensor type
DP and SP are the available sensor selections for a differential pressure gauge. The reason for
this is that it allows different sensors to be used for the index calculation. When DP is selected,
the differential pressure sensor is used. When SP is selected, the static pressure sensor is used.
Therefore, the diagnosis characteristics may change.
The following are the features of clogging diagnosis when DP is selected.
• The flow rate or magnitude of the pressure fluctuation necessary for diagnosis is smaller than for
SP.
• Since a sampling interval of 120 ms can be selected, the sensitivity for clogging detection is high.
The index update frequency is also high.
• It may not be possible to detect one-side clogging.
The following are the features of clogging diagnosis when SP is selected.
• The pressure fluctuation necessary for diagnosis is larger than for DP. Therefore, diagnosis may
be possible with DP but not possible with SP.
• The sampling interval is fixed at 360 ms. The sensitivity for clogging detection decreases and the
index update frequency is low in comparison to DP with 120 or 240 ms selected.
• It is possible that one-side clogging that cannot be detected or that is difficult to detect with DP
can be detected with SP.
The advantage of selecting SP is that its one-side clogging detection capability is different from
that of DP. However, selecting SP does not ensure one-side clogging detection. When the clogging
simulation test cannot be conducted or when one-side clogging cannot be detected with SP, select
DP. In these cases there is no advantage in selecting SP.
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