Bronkhorst EL-FLOW Base 2010 - Manual (Page 4)

9.17.060 4
8. Multi-functional switch operation:
Using the 2 colored LEDs and the switch on the EL-FLOW Base, several
actions can be monitored and started. The green LED is used for status
indication. The red LED is used for errors/warnings/messages.
The switch can be used to start several actions, such as auto-zero,
restore factory settings and bus-initialization actions, if applicable.
See specific zero-procedure below (10) or see ‘Instruction Manual
EL-FLOW Base series’ for more details.
9. Purging:
In systems for use with corrosive or reactive fluids, purging for at least 30 minutes with a dry, inert gas (like
Nitrogen or Argon) is absolutely necessary before use. After use with corrosive or reactive fluids, complete purging
is also required before exposing the system to air.
Warm-up time:
Let the EL-FLOW Base warm-up for at least 30 minutes for best accuracy.
10. Zeroing:
The zero-point of each instrument is factory adjusted. If so required the zero point may be re-adjusted over RS232
or Modbus or by means of using the micro switch. Procedure for zeroing by micro switch:
♦ ♦ ♦ ♦
Warm-up, pressure up 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 micro switch and hold it. After a short time the red LED will go ON and OFF, then the green LED will go
ON. At that moment release the micro 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 approx. 10 seconds.
♦ ♦ ♦ ♦
When the indication is showing 0% signal and the green indication LED is burning continuously again, then
the zeroing action was successful.
Ready:
Your EL-FLOW Base MFC is now ready for operation.
Error/warning LED
Status LED
Multifunctional
switch