Yokogawa EJA115 - Manual (Page 31)

IM 01C22K01-01E 7-1
7. OPERATION
7. OPERATION
7.1 Preparation for Starting
Operation
The Model EJA115 low flow transmitter measures the
flow rates of liquids and gases. This section describes
the operation procedure for the EJA115 as shown in
Figure 7.1 (vertical impulse piping type, high-pressure
connection: right side) when measuring a liquid flow
rate.
(a) Follow the procedures below to introduce process
pressure into the transmitter.
1) Open the stop valve on the downstream side.
2) Gradually open the stop valve on the upstream side
to introduce process fluid into the transmitter
pressure-detector section.
This will cause process fluid to flow into the orifice
built in the manifold, and apply flow-dependent
differential pressure to the high and low pressure
sides of the transmitter.
3) Confirm that there are no pressure leaks in the stop
valves on the upstream and downstream sides,
process piping connection or transmitter, etc.
(b) Venting Gas from the Transmitter Pressure-detector
Section
Since the piping in the example of Figure 7.1 is
constructed to be self-venting, no venting operation
is required. If it is not possible to make the piping
self-venting, refer to Subsection 7.6 for instructions.
(c) Turn ON power and connect the BT200.
Open the terminal box cover, and connect the
BT200 to the SUPPLY + and – terminals.
(d) Using the BT200, confirm that the transmitter is
operating properly. Check parameter values or
change the setpoints as necessary. See Chapter 8 for
BT200 operation.
If the transmitter is equipped with an integral
indicator, its indication can be used to confirm that
the transmitter is operating properly.
Stop valve(downstream side)
Stop valve
(upstream side)
Manifold
F0701.EPS
Figure 7.1 Liquid Flow 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