Bronkhorst Multibus - Manual (Page 39)

BRONKHORST ®
Page 39 Operational instructions for digital multibus instruments 9.17.023
10 SPECIAL INSTRUMENT FEATURES
10.1 Z
EROING
Not applicable for: EL-PRESS (Metal Sealed) Series
IN-PRESS Series
LIQUI-FLOW Series L10(I) / L20(I)
LIQUI-FLOW Series L30
The zero procedure is able to remove zero offset signals on the sensor signal automatically. This automatic procedure
can be started through the BUS/RS232 or by means of the switch on the instrument.
10.1.1 Zeroing with the micro-switch
Set process conditions Warm-up, pressure up the system and fill the instrument according to the process
conditions.
Start
Stop flow
Press and hold
Zeroing
Ready
Make sure no flow is going through the instrument by closing valves near the instrument.
With no flow, use the push-button switch (#) on the outside of the instrument to start the
zero adjustment procedure. Press the push-button (#) and hold it, after a short time the
red LED will go ON and OFF then the green LED will go ON. At that moment release the
push-button (#).
The zeroing procedure will start at that moment and the green LED will blink fast. The
zeroing procedure waits for a stable signal and saves the zero. If the signal is not stable
zeroing will take long (max 180 sec) and the nearest point to zero is accepted. The
procedure will take approx. 10 sec (for CORI-FLOW approx. 120 sec). Always make sure
that there is going no flow through the instrument when performing the zeroing
procedure.
When indication is showing 0% signal and the green indication LED is burning continuously
again, then the zeroing procedure has been performed well.