Alicat LC Series Liquid Flow Controller - Manual (Page 29)

29
CAUTION! N���� ����� � C��������� ���� � ���-���� ���-����� ��
�� �������� �� ��������� �� ���� ����. T�� ���������� ���� �����
���� ����� �� ��� ����� �� �� ������� �� ����� ��� ���-�����.
W��� ����� �� �� ����, ���� ��� ���� ��� ����� ���� HOT!
CONTROL SETUP (conti nued)
LOOP VAR—Water fl ow controllers are
defaulted to volume fl ow.
Volume means that the controller is
“closing the loop” on the volume fl ow
rate. This means that when you give
the controller a set-point, the controller
compares that set-point to the measured
volume fl ow rate and adjusts the valve
to try to make the fl ow and the set-point
match. For the volume fl ow rate, the input
signal (e.g. 0-5 Vdc) corresponds to the
full-scale fl ow rate for the device.
ON AUTO / OFF AUTO—refers to the
standard auto-tare or “auto-zero” feature.
The auto-tare feature automati cally tares
(takes the detected signal as zero) the unit
when it receives a zero set-point for more
than two seconds.
A zero set-point results in the closing
of the valve and a known “no fl ow”
conditi on. This feature makes the device
more accurate by periodically removing any
cumulati ve errors associated with drift .
It is recommended that the controller be left in the default auto-tare
ON mode unless your specifi c applicati on requires that it be turned off .
LOOP
VAR
ON
AUTO PID MAIN
SETPT
SOURCE
LN-DN
CANCEL SET
LN-UP MODE
> Volumetric Flow
SETPT
+0.0