Yokogawa EJX118A - Manual (Page 31)

<6. Operation>
6-1
IM 01C25H01-01E
6. Operation
6.1 Preparation for Starting
Operation
This section describes the operation procedure
for the EJ118 as shown in Figure 6.1 when
measuring liquid level in a closed tank, and
EJ438 as shown in Figure 6.2 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 communicator.
Open the terminal box cover and connect
the communicator to the SUPPLY + and
– terminals.
(c) Using the communicator, confirm that the
transmitter is operating properly. Check
parameter values or change the setpoints as
necessary.
See IM 01C25T03-01E (BRAIN
communication) or IM 01C25T01-06EN (HART
communication) for communicator operation.
If the transmitter is equipped with an integral
indicator, its indication can be used to confirm
that the transmitter is operating properly.
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Closed tank
Transmitter mounting pipe
50mm (2 inches)
Capillary tube
Differential pressure
transmitter
Diaphragm seal
(high pressure side)
Diaphragm seal
(low pressure side)
Figure 6.1 Liquid Level Measurement in a Closed
Tank
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Transmitter mounting pipe
50mm (2 inches)
Capillary tube
pressure transmitter
Diaphragm seal
(high pressure side)
Figure 6.2 Pressure 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
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