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Option: Totalizing Mode - Controllers
Controllers can be purchased with the Totalizing Mode option. This option adds
an additional mode screen that displays the total flow (normally in the units of
the main flow screen) that has passed through the device since the last time the
totalizer was cleared. The Totalizing Mode screen is accessed by pushing the
TOTAL/MENU button on the
MAIN
display.
TOTAL/TIMER: Pushing the TOTAL/TIMER button
will cycle the large numbers on the display
between total mass and time elapsed.
Rollover – The customer can also specify at the
time of order what the totalizer is to do when
the maximum count is reached. The following
options may be specified:
No Rollover – When the counter reaches the
maximum count it stops counting until the
counter is cleared.
Rollover – When the counter reaches the
maximum count it automatically rolls over to
zero and continues counting until the counter is cleared.
Rollover with Notification – When the counter reaches the maximum count
it automatically rolls over to zero, displays an overflow error, and continues
counting until the counter is cleared.
TOTAL MASS: The counter can have as many as seven digits. At the time of order,
the customer must specify the range. This directly affects the maximum count. For
instance, if a range of 1/100ths of a liter is specified on a meter which is totalizing in
liters, the maximum count would be 99999.99 liters. If the same unit were specified
with a 1 liter range, the maximum count would be 9999999 liters.
ELAPSED TIME: The small numbers below the mass total show the elapsed time
since the last reset in hours, minutes and seconds. The maximum measurable
elapsed time is 9999 hours 59 minutes 59 seconds. The hours count resets when
RESET
is pushed, an RS-232 or RS-485 clear is executed or on loss of power. Press
TOTAL/TIMER to show this as the primary display.
SETPT: Pushing SETPT will allow you to change the controller's setpoint.
RESET
– The counter can be reset to zero at any time by pushing the RESET
button. To clear the counter via RS-232 or RS-485, establish serial communication
with the meter or controller as described in the RS-232 or RS-485 section of the
manual. To reset the counter, enter the following commands:
(unit ID)T
<CR> (e.g. AT<CR>)
SETPT
+123.4
MENU/
MAIN
SCCM
+123.4
TOTAL/
TIMER
BATCH
RESET
50:56 h:m:s
+123.45
Scm3
When using a mass flow controller as an absolute pressure controller,
the mass flow rate may momentarily exceed the flow measurement
capability (full scale + 28%) of the unit. This may occur when the unit is
asked to make an abrupt pressure change.
If the totalizer is in use at that time, the totalized value will necessarily become
incorrect. A time error will be displayed and the total value will blink. Please reset
the totalizer if such an ‘over-flow’ condition has occurred.
