Bronkhorst Multibus User Manual
Page 40
BRONKHORST
®
Page 40
Operational instructions for digital multibus instruments
9.17.023
10.1.2 Zeroing with digital communication
The following parameters must be used for zeroing an instrument:
Initreset
[unsigned char, RW,0...255, DDEpar. = 7, Process/par. = 0/10]
Control mode
[unsigned char, RW,0...255, DDEpar. = 12, Process/par. = 1/4]
Calibration mode
[unsigned char, RW,0...255, DDEpar. = 58, Process/par. = 115/1]
This action will be performed already during production at Bronkhorst, but may be repeated at wish on site
For (mini) CORI-FLOW always perform a zero on site.
10.2 R
ESTORE PARAMETER SETTINGS
All parameter value settings in the instruments are stored in non-volatile memory so each time at power-up these
settings are known. However, several settings can be changed afterwards in the field by a user if needed. Sometimes it
may be necessary to get back all original settings. Therefore a backup of all settings, at production final-test, are
stored in non-volatile memory. Because of this it is possible to restore these original factory settings at any moment.
Restoring original factory settings can be achieved by means of the micro-switch on top of the instrument or through
a command via BUS/RS232. See instructions for manual operation with switch and LED’s for details.
Set process conditions Warm-up, pressure up the system and fill the instrument according to the process
conditions.
Start
Stop flow
Send parameters
Zeroing
Ready
Make sure no flow is going through the instrument by closing valves near the instrument.
Send the following values to the parameters in this sequence.
Initreset
64
Control mode
9
Calibration mode
255
Calibration mode
0
Calibration mode
9
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. 10 sec. So make always 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 zeroing has been performed well. Also parameter control mode
goes back to its original value. As last send 0 to parameter initreset.