Bronkhorst®
Instruction Manual EL-FLOW® Prestige
9.17.084N
36
3.10.2 Digital procedure
FlowPlot provides an easy way to adjust the zero point of an instrument via RS-232; the
Auto zero
function automatically
performs the procedure described here
To adjust the zero point using digital communication, set parameter values in the following sequence (see section
for more information about instrument parameters):
Sequence #
Parameter
Value
Action
1
Setpoint
0
stop flow (close control valve)
2
Init Reset
64
unlock secured parameters
3
Control Mode
9
enable calibration mode
4
Calibration Mode
0
reset calibration mode
5
Calibration Mode
9
start zeroing
The green LED starts to blink fast, indicating that the zeroing procedure is being performed. On completion, the green LED
starts to glow continuously, while the output signal is 0% (parameter
Measure
= 0). At the same time, parameter
Control Mode
returns to its initial value. If the procedure is successful, parameter
Calibration Mode
changes to 0 (idle). If the procedure fails,
Calibration Mode
changes to 255.
After performing the procedure, remember to set parameter
Init Reset
to value 0 to lock secured parameters