Design, Assembly and Service Manual
Page 35 of 44
Induction flow meter FMG600 series
where the electrodes are connected to an AC voltage source causing the accumulated layer to dissolve in
the measured fluid. It is recommended that the cleaning process be repeated in regular intervals.
One cleaning cycle lasts 1 minute. Measurements are discontinued during the cleaning action while the
immediately preceding flow conditions are being simulated. The cleaning action can be indicated using the
multifunctional outputs. While the cleaning process is in progress, message "Cleaning Electrodes" can be
seen on the top display line. The bottom line shows last value of the selected measured quantity. As soon as
the cleaning action is over, the meter resumes normal measurements.
There are several ways of initiating the electrode cleaning cycle:
Menu:
Electrode cleaning, depress
Cleaning OFF
Single cycle
During Power ON
Periodic [day]
The two-line display unit will always show only two of the four menu items. Use push-buttons and to
page downwards and upwards through the menu items. Select the desired item and depress . The display
will return to the basic menu, item “Electrode Cleaning”...
Upon selecting the “Single cycle” option, the cleaning process will immediately start. On completion of the
cleaning cycle, the meter will return to the “Cleaning OFF” status.
The selection “During Power ON” implies that a cleaning process will be initiated wherever line voltage is
switched on. In the “Periodic [Day]” mode of operation, cleaning processes will be initiated automatically in
regular intervals to be chosen by the user from the range 1 to 255 days. The time counting process will
always start upon setting a new cleaning period.
Comment:
When using a supply voltage source 24V AC/DC, the electrode cleaning function is inoperative.
Menu:
Electrode cleaning, depress / Periodic [day], depress
The display will read “Cleaning [Day] xxx“. Move the cursor using push-button , increase/decrease the “x”
values using push-buttons or , respectively. Replace xxx by a number from 1 to 255 (days). Depress .
The display will read “Value entered Press any key”. Press any key, preferably . This action will return the
display to the basic programming menu, item “Electrode Cleaning”.
7.1.6. Serial line
The meter is provided with a serial communication interface, intended for servicing purposes. In the standard
configuration, the USB port is implemented. Electrically insulated port RS 485 is included on special request.
Serial port USB
This port is accessible through USB type B connector. Interconnection to the computer is facilitated by
means of a cable provided with USB type A connector at one end and USB type B connector at the other
end.
The USB port is not insulated from the other meter circuits; it is primarily intended for servicing purposes.
Permanent operational use is not recommended.
Serial port RS 485
The RS 485 port is optional accessory of the induction meter. It is electrically insulated from the other meter
circuitry and allows for interconnection of up to 31 flow meters to a common communication network. The
maximum length of the connecting two-wire twisted cable is 3,937 ft (1,200m). If repeaters are used, the
