Yokogawa EJA220A - Manual (Page 28)

IM 01C21C01-01E 7-1
7. OPERATION
7. OPERATION
7.1 Preparation for Starting
Operation
The Model EJA210A and EJA220A flange mounted
differential pressure transmitter measures the levels or
densities of liquids. This section describes the opera-
tion procedure for the EJA210A as shown in Figure 7.1
when measuring a liquid level in an open tank.
(a) Confirm that there is no leak in the connecting part
of the transmitter mounting flange.
Remove the plastic dust cap placed in the process
connector (low pressure side).
(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 8. If
the transmitter is equipped with an integral indica-
tor, its indication can be used to confirm that the
transmitter is operating properly.
Open tank
F0701.EPS
Figure 7.1 Liquid Level Measurement
᭿ Confirming that Transmitter is Operating
Properly
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
PARAM
C60:SELF CHECK
ERROR
Communication error
(Faulty wiring) Self-diagnostic error
(Faulty transmitter)
DATA DIAG PRNT ESC
F0702.EPS
Using the integral indicator
• If the wiring system is faulty, the display stays blank.
• If the transmitter is faulty, an error code will appear
on the display according to the nature of the error.
Self-diagnostic error on
the integral indicator
(Faulty transmitter)
F0703.EPS
NOTE
If any of the error indications above appears on
the display of the integral indicator or BT200,
refer to Subsection 8.5.2 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 8.3.3.
• Measuring range ....... See Subsection 8.3.3 (2)
• Operation mode ......... See Subsection 8.3.3 (8)