© Bronkhorst High-Tech B.V.
5
7.2
BUS/digital operation
For this procedure see description
for RS232 operation or specific
(optional) fieldbus.
RS232 connection cable 7.03.444
enables to use (free downloadable)
tooling programs for Windows.
Example 3
Example 4
8
Multi-functional switch operation
Using the 2 colored LEDs and the switch on the
mini CORI-FLOW™
, several
actions can be monitored and started. The green LED is used for status
indication. The red LED is used for errors/warnings. The switch can be used to
start several actions, such as auto-zero, restore factory settings and bus-
initialization actions. See specific zero-procedure part in this manual or see
‘General instructions for
mini CORI-FLOW™
’ for more details.
Important warning!
When red LED blinks shortly: measuring signal is unstably or noisy: instrument is possibly
exposed to vibrations or pulsating flow.
9
Purging
In systems for use with corrosive or reactive fluids, purging with an inert gas is absolutely necessary before use. After
use with corrosive or reactive fluids, complete purging is also required before exposing the system to air. Purge the
mini CORI-FLOW™
with actual fluid to get rid of all the Air/gas in the tubes (for liquids) or to remove all possible
condensation drops (for gases).
Special control mode for purging
In case of a
mini CORI-FLOW™
controller give setpoint = 100 % to control the valve or the pump. It is also possible
to use special control mode = 8 to fully open the valve or set the pump at max. rpm, using a digital interface. This
will bypass the PID-controller and might be usefull when having the
mini CORI-FLOW™
set to a low capacity. It will
ensure you to get the highest possible flow for purging.
Warm-up time
Let the
mini CORI-FLOW™
warm-up for at least 30 minutes for best accuracy.
10
Zeroing
Before first use, when process conditions change significantly (especially temperature) or when the instrument has
been re-mounted (e.g. after servicing) it is recommended to perform an automatic zero action with the
mini CORI-
FLOW™
. This action can be started manually (as described below) or via a digital interface (see document Operation
instructions digital instruments: 9.17.023). Under normal (constant) conditions it will not be necessary to zero before
each application start-up.
10.1
Set process conditions
After warming-up, pressuring and purging the system, including the
mini CORI-FLOW™
,
prepare the
mini CORI-FLOW™
for actual process conditions.
10.2
Stop flow
Make sure there is no flow through the
mini CORI-
FLOW™
by closing a shut-off valve (in front of and)
after the instrument. At least one (shut-off) valve
after the
mini CORI-FLOW™
is required. High
quality up- and downstream shut-off valves are
recommended for proper zero point calibration.
10.3
Start Auto-Zero
With no flow, use the push-button switch (#) on the
mini CORI-FLOW™
to start the zero adjustment
procedure (LEDs first will go off). (1), (2) and (3):
Press the push-button (#) and hold it for 8..12
seconds (each 4 seconds the LED-indication will
change). (4): Release the push-button (#) when the
green LED is on.
10.4
Zeroing procedure
The zeroing procedure will start now and the green
LED will blink fast. The procedure will take at least
45 sec. When the signal is not stable the procedure
will take longer (max. 6 retries will be performed).
The red LED will blink when signal is unstable/noisy.
Make sure that there is no flow through the
mini
CORI-FLOW™
when performing the zeroing
procedure and avoid vibrations !
45 sec.
10.5
Ready
When indication is showing 0% signal and the
green indication LED is continuously on, then zero
has been performed well. Instrument is in normal
operation mode now and ready for use.
Measurement check
For a controller: send a setpoint to the
mini CORI-FLOW™
and check the measured value.
Make sure the
mini CORI-FLOW™
indicates 0% at zero flow.
Your
mini CORI-FLOW™
is now ready for operation.
Bronkhorst High-Tech B.V., Nijverheidsstraat 1a, NL-7261AK Ruurlo The Netherlands
T
+31(0)573 45 88 00
F
+31(0)573 45 88 08
I
www.bronkhorst.com
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