YOKOGAWA DP harp EJX Series - Replacing the Process Connector Gaskets; Troubleshooting; Basic Troubleshooting

<8. Maintenance>
8-6
IM 01C25B01-01E
F0804.ai
Transmitter section
Pressure-detector section
Cover flange
Capsule gasket
Flange bolt
Setscrew
Nut
Figure 8.4 Removing and Mounting the Pressure-
detector Section
IMPORTANT
If you remove the vent/drain plugs when
disassembling EJ130 and EJ440
transmitters, install the plugs again before
reassemblingthecoverangeswiththecapsule
assmbly.
8.4.4 Replacing the Process Connector
Gaskets
This subsection describes process connector
gasketreplacement.(Seegure8.5.)
(a) Loosen the two bolts, and remove the process
connectors.
(b) Replace the process connector gaskets.
(c) Remount the process connectors. Tighten the
bolts securely and uniformly to a torque shown
below, and verify that there are no pressure
leaks.
Model
EJ110
EJ120
EJ130
EJ310
EJ430
EJ440
C capsule D capsule
Torque(N·m)
{kgf·m}
39 to 49
{4 to 5}
49 to 59
{5 to 6}
F0805.ai
Bolt
Process connector
Process connector gasket
Figure 8.5 Removing and Mounting the Process
Connector
8.5 Troubleshooting
If any abnormality appears in the measured values,
usethetroubleshootingowchartbelowtoisolate
and remedy the problem. Since some problems
havecomplexcauses,theseowchartsmay
notidentifyall.Ifyouhavedi󰀩cultyisolatingor
correcting a problem, contact Yokogawa service
personnel.
8.5.1 Basic Troubleshooting
First determine whether the process variable
is actually abnormal or a problem exists in the
measurement system.
If the problem is in the measurement system,
isolate the problem and decide what corrective
action to take.
This transmitter is equipped with a self-diagnostic
function which will be useful in troubleshooting,
and the transmitter equipped with an integral
indicator will show an alarm code as a result of self-
diagnosis.
See subsection 8.5.3 for the list of alarms.
See also each communication manual.