Bronkhorst FlowPlot - Manual (Page 18)

BRONKHORST ®
Certain readout units contain a relay, which can be switched in case of an alarm. Two modes can be selected at
Output: Continuously, the relay is closed when the alarm is active, or Alternating, the relay is repeatedly closed and
opened while the alarm is active.
Once an alarm is set, it must be reset to clear it. There are several possibilities to reset an alarm:
- Keyboard: the alarm can be reset through the keyboard of a readout unit.
- External: the alarm can be reset through an external signal, supplied to the appropriate input of a
readout unit.
- FLOW-BUS: the alarm can be reset by another device connected to the same FLOW-BUS.
- Automatic: the alarm is reset automatically when the cause of the alarm is cancelled.
At Reset the desired method or a combination of these methods can be selected. When one of the reset methods is
FLOW-BUS, the alarm can also be reset by the button Reset alarm.
At the bottom of the Alarm frame, the actual alarm status is indicated by a series of LEDs. The upper three indicate the
user configurable alarms. The other four indicate the status of the device or the connection to its master instrument
(only applicable in a FLOW-BUS system with a master/slave setup).
Counter settings
Most flow meter and controller instruments contain an integrated batch counter, to totalize the total amount of mass
(or volume) that passed through an instrument. This function can be configured at the Counter frame.
At Mode, the desired counter method can be selected, which can be one of the following:
- Up will count the total amount of mass (or volume) until the counter is reset.
- Up to limit counts the total amount of mass (or volume) and raises an alarm when a certain limit is
reached. The amount at which the alarm should be raised, can be specified at Limit. For mini CORI-FLOW
controllers with integrated CORI-FILL ® technology, highly accurate batch dosing is possible by selecting
this mode. For these instruments two additional counter control options are available: an Overrun
correction setting and the Counter control gain. The latter can be used to adjust the proportional
counter control function when a control valve (not a shut-off) is connected.
When the mode Up to limit is selected and the limit is reached, several actions can be taken. These are very similar to
the possible actions on other alarms, but can be configured just for the ‘Counter limit reached’ alarm. A description of
these possibilities is given in ‘Alarm settings’. The button Reset counter resets the counter to zero.
At the bottom of the Counter frame, the actual counter value is indicated as well as a LED which indicates if the
counter limit is reached and the alarm is raised.
Page 18 FlowPlot 9.17.030