Replacing The Process Connector Gaskets; Troubleshooting; Basic Troubleshooting - YOKOGAWA Dpharp vigilantplant EJA110A User Manual

Pressure-detector section
Cover flange
Capsule gasket
Flange bolt
Figure 9.4.3 Removing and Mounting the Pressure-
detector Section
9.4.4 Replacing the Process Connector
Gaskets
This subsection describes process connector gasket
replacement. (See Figure 9.4.4.)
(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 of 39 to 49 N·m
{4 to 5 kgf·m}, and verify that there are no pressure
leaks.
Bolt
Process connector
Process connector gasket
Figure 9.4.4 Removing and Mounting the Process
Connector
Nut
Allen screw
Transmitter section
F0904.EPS
F0905.EPS
9-6

9.5 Troubleshooting

If any abnormality appears in the measured values, use
the troubleshooting flow chart below to isolate and
remedy the problem. Since some problems have
complex causes, these flow charts may not identify all.
If you have difficulty isolating or correcting a problem,
contact Yokogawa service personnel.

9.5.1 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; see
Section 8.5 for information on using this function.
: Areas where self-diagnostic offers support
Abnormalities appear in measurement.
YES
Is process variable
itself abnormal?
Inspect the NO
process system.
Isolate problem in
measurement system.
YES
Does problem exist in
receiving instrument?
NO
Inspect receiver.
Environmental conditions
Check/correct
environmental conditions.
Operating conditions
Check/correct operating
conditions.
Figure 9.5.1 Basic Flow and Self-Diagnostics
9. MAINTENANCE
Measurement system problem
Transmitter itself
Check transmitter.
F0906.EPS
IM 01C21B01-01E