Do not power the instrument simultaneously from two different power sources (e.g. bus connection and PiPS).
Doing so will blow the fuse on the printed circuit board, requiring the return of the instrument for repair.
A PiPS (Plug-in Power Supply, art.nr.: 7.03.422) is available to power a single instrument and can be used instead of
the DB9 loose-end cable as shown in the example above. Detailed information can be found in the manual PiPS
(9.17.055) which can be downloaded from
www.bronkhorst.com/downloads
.
c. Fieldbus operation
With digital operation over RS485 or Ethernet a bus-system with multiple instruments can be set up. If a separate
fieldbus connection (e.g. DeviceNet™, EtherCAT®) is present (instrument top side), refer to the specific fieldbus
manual. For RS485 operation over the 9-pin Sub-D connector (if installed) refer to the EL-FLOW® Prestige manual
(document no. 9.17.084).
8
Multifunctional micro switch operation
Using the 2 colored LEDs and the micro switch on top of the
EL-FLOW®
Prestige
, several actions can be monitored and started. The
•
green LED is
used for status indication. The
•
red LED for errors/warnings/messages. The
switch can be used to start several actions, such as autozero, restoring
factory settings and bus initialization actions, if applicable. See zeroing
procedure below (step 10) or check the EL-FLOW® Prestige manual
(document no. 9.17.084) for more details.
The micro switch can be operated with a thin, metal or hard plastic pin (for example the end of a paperclip).
9
Purging
Prior to operating the instrument with either corrosive or reactive fluids, it is absolutely necessary to purge the
instrument with a dry, inert gas (e.g. nitrogen or argon) for at least 30 minutes. Complete purging is also necessary
after use with a corrosive or reactive fluid, before exposing the instrument to air.
Warm-up time
For accurate measurement, it is recommended to warm up the instrument for at least 30 minutes. This can also be
done while purging.
10
Zeroing
The zero point of each Bronkhorst® flow meter is factory adjusted. If required the zero point can be re-adjusted over
RS232 or with the multifunctional switch. Procedure for zeroing by multifunctional switch:
Warm up and pressurize the system and fill the instrument according to the process conditions.
Make sure no flow is going through the instrument, by closing valves near the instrument.
The setpoint must be zero.
Press the multifunctional switch and hold it. After a short time, the
•
red LED will go ON and OFF, then the
•
green LED will turn ON. At that moment, release the switch.
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 approximately 5 seconds.
When the indication is showing 0% signal and the
•
green indication LED is glowing continuously again, then the
zeroing action was successful.
Your
EL-FLOW® Prestige
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
E
