7
a. Analog/local operation
Connect the device to the power supply/readout unit using a cable with 9-pin D-sub connector. For controllers, the
setpoint is proportional to the flow range. This principle also applies to digital operation.
b. Digital RS232 operation
Connecting the instrument with an RS232 cable to a Windows computer enables operation using the free
Bronkhorst® software for Windows, such as FlowDDE and FlowPlot.
Consult the
EL-FLOW®
manual for more information.
c. Fieldbus operation
Connect the instrument according to the specific fieldbus standard. Refer to the appropriate fieldbus hook-up
document.
8
Multifunctional switch operation
Using the 2 LEDs and the switch on the
EL-FLOW®
, several instrument
functions can be monitored and started. The green LED is used for status
indication, the red LED is used for error and warning messages. The switch
can be used to execute several functions, such as zeroing, bus initialization
and restoring factory settings. Consult the
EL-FLOW®
manual for details.
9
Purging
If the instrument will be used with corrosive or reactive media, purging with an inert gas (e.g. Nitrogen or Argon) for
at least 30 minutes is absolutely necessary before use. After use with such media, complete purging is also required
before exposing the system to air.
Warm-up time
For accurate results, it is recommended to warm up the instrument for at least 30 minutes before starting
measurement (this can be done while purging).
10
Adjusting zero point
The zero point of each Bronkhorst® flow meter is factory adjusted. If required, the zero point can be re-adjusted via
RS232 or with the multifunctional switch. Procedure for adjustment with the multifunctional switch:
Warm up and pressurize the system and fill the instrument according to the actual process conditions.
Make sure the flow through the instrument is blocked, by closing a valve immediately before or after the
instrument.
Set the setpoint to 0%.
Press and hold the multifunctional switch. After a short time, the red LED will turn on and off, at which moment
the green LED will turn on. At that moment (which is 8 seconds after pressing), release the switch.
The zeroing procedure will start and the green LED will blink fast. The zeroing procedure waits for a stable signal
and saves the new zero point. Typically, this will take approximately 10 seconds. If the signal is unstable, the
procedure can take longer and the nearest point to zero is accepted.
When the indication is showing 0% signal and the green indication LED is glowing continuously again, the
zeroing action was successful.
Your
EL-FLOW®
Select
is now ready for operation.
Bronkhorst High-Tech B.V., Nijverheidsstraat 1a, NL-7261AK Ruurlo, The Netherlands
T
+31(0)573 45 88 00
I
www.bronkhorst.com
E
