IM 01C25R01-01E
8-1
8. OPERATION
8.
OPERATION
8.1 Preparation for Starting
Operation
This section describes the operation procedure for the
EJX910A as shown in figure 8.1 (vertical impulse
piping type, high-pressure connection: right side) when
measuring the liquid flow rate.
NOTE
Check that the process pressure tap valves,
drain valves, and 3-valve manifold stop valves
on both the low pressure and high pressure
sides are closed, and that the 3-valve manifold
equalizing valve is opened.
(a) Follow the procedures below to introduce process
pressure into the impulse piping and transmitter.
Multivariable Transmitters
1) Open the low pressure and high pressure tap valves
to fill the impulse piping with process liquid.
2) Slowly open the high pressure stop valve to fill the
transmitter pressure-detector section with process
liquid.
3) Close the high pressure stop valve.
4) Gradually open the low pressure stop valve and
completely fill the transmitter pressure-detector
section with process liquid.
5) Close the low pressure stop valve.
6) Gradually open the high pressure stop valve. At this
time, equal pressure is applied to the low and high
pressure sides of the transmitter.
7) Check that there are no liquid leaks in the impulse
piping, 3-valve manifold, transmitter, or other
components.
Venting Gas from the Transmitter Pressure-
detector Section
• Since the piping in the example of figure 8.1 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 8.5 for instructions.
Leave the equalizing valve open even after venting
gas.
(b) Turn ON power and connect the communicator.
Open the terminal box cover, and connect the
communicator to the and – terminals.
(c) Using the communicator, confirm that the transmit-
ter is operating properly. Check parameter values or
change the setpoints as necessary.
See IM 01C25R02-01E (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.
F0801E.EPS
Orifice
Tap valve
(high pressure)
Tap valve
(low pressure)
3-valve manifold
Drain valve
(high pressure)
Stop valve
(low pressure)
Stop valve
(high pressure)
Equalizing valve
Figure 8.1
Liquid Flow Measurement
Confirming that Transmitter is Operating
Properly
Using the HART communicator
• If the wiring system is faulty, ‘No device found at
adress O Poll' or communication error’ appears on
the display.
• If the transmitter is faulty, ‘error message’ appears on
the display.
