Bronkhorst Mini CORI-FLOW - Manual (Page 26)

BRONKHORST CORI-TECH B.V.
3.4.4 Alternatives for starting zero procedure
• Through FLOW-BUS, using an E-7000 readout/control module.
• Through FLOW-BUS, via a RS232/FLOW-BUS converter using software on a PC or PLC.
• Through RS232, using software on a PC or PLC
• Through RS232, using a Bright compact local readout/control module
• Through other fieldbus system (PROFIBUS-DP/DeviceNet/ModBus)
3.4.5 Zeroing with the Micro-switch
Before using the instrument zeroing is required.
• Set process conditions
After warm-up, pressure up and fill system including the mini CORI-FLOW
according to the process conditions.
• Stop flow
Make sure there is no flow through the instrument by closing the shut-off valves before and after the
instrument.
• Press and hold, until GREEN LED is on, than release button
With no flow, use the push-button switch (#) on the left side 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 (#).
• Zeroing
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
and the nearest point to zero is accepted. The procedure will take approx. 25 sec.
Make sure that there is no flow through the instrument when performing the zeroing procedure.
• Ready
When indication is showing 0% signal and the green indication LED is continuously on, then zero has
been performed well.
3.4.6 Zeroing through the digital communication
It is also possible to start the zero adjustment procedure through the FLOW-BUS, using an E-7000
readout/control unit or a software program on a PC, connected to a FLOW-BUS interface module.
The following parameters must be used for zeroing an instrument:
Initreset [unsigned char, RW,0...255, DDEpar. = 7, Proces/par. = 0/10]
Cntrlmode [unsigned char, RW,0...255, DDEpar. = 12, Proces/par. = 1/4]
CalMode [unsigned char, RW,0...255, DDEpar. = 58, Proces/par. = 115/1]
• Set process conditions
Warm-up, pressure up the system and fill the instrument according to the process conditions.
• Stop flow
Make sure there is no flow through the instrument by closing the shut-off valves before and after the
instrument.
• Send parameters
Send the following values to the parameters in this sequence.
Initreset 64
Cntrlmode 9
Calmode 255
Calmode 0
Calmode 9
• Zeroing
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
and the nearest point to zero is accepted. The procedure will take approx. 25 sec.
Make sure there is no flow through the instrument when performing the zeroing procedure.
• Ready
When indication is showing 0% signal and the green indication LED is burning
continuously again, then zeroing has been performed well. Also parameter control mode
goes back to its original value. As last send 0 to parameter initreset.
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