Yokogawa EJA438 - Manual (Page 26)

IM 1C22J1-01E 6-1
6. OPERATION
6. OPERATION
6.1 Preparation for Starting Op-
eration
The Model EJA438W and EJA438N diaphragm sealed
gauge pressure transmitter measures the pressure of
liquids, gases, and steam. This section describes the
operation procedure for the EJA438W as shown in
Figure 6.1.1 when measuring pressure in a tank.
(a) Confirm that there is no leak in the connecting part
of each diaphragm seal mounting flange.
(b) Turn ON power and connect the BT200.
Open the terminal box cover and connect the
BT200 to the SUPPLY + and –terminals.
(c) Using the BT200, confirm that the transmitter is
operating properly. Check parameter values or
change the setpoints as necessary.
For BT200 operating procedures, see Chapter 7. If
the transmitter is equipped with an integral
indicator, its indication can be used to confirm that
the transmitter is operating properly.
F0601.EPS
Transmitter mounting pipe
50mm (2 inches)
Capillary tube
Pressure transmitter
Diaphragm seal
Figure 6.1.1 Pressure Measurement
᭿
Confirming that Transmitter is Operating
Properly
Confirmation using the BT200
• If the wiring system is faulty, ‘communication error’
appears on the display.
• If the transmitter is faulty, ‘SELF CHECK ERROR’
appears on the display.
Communication error
(Faulty wiring) Self-diagnostic error
(Faulty transmitter)
communication error
PARAM
C60:SELF CHECK
ERROR
DATA DIAG PRNT ESC
F0602.EPS
Confirmation using the integral indicator
• If the wiring system is faulty, the display is blank.
• If the transmitter is faulty, an error number will
appear on the display according to the nature of the
error.
Self-diagnostic error
(Faulty transmitter)
F0603.EPS
NOTE
If any of the error indications above appears on
the display of the integral indicator or BT200,
refer to Subsection 7.5.2 for corrective action.
᭿
Verify and Change Transmitter Parameter
Setting and Values
The following parameters are the minimum settings
required for operation. The transmitter has been
shipped with these parameters. To confirm or change
the values, see Subsection 7.3.3.
• Measuring range........See Subsection 7.3.3 (2)
• Operation mode.........See Subsection 7.3.3 (7)