Bronkhorst®
Instruction Manual EL-FLOW® Select
9.17.099J
22
3.4
Valve Safe State
When a controlling instrument is not powered or cannot communicate with the fieldbus network (if applicable), all electrical
valves operated by the instrument (whether integrated or external) automatically return to their default state. The default
state is closed for 'normally closed' valves (n/c) and fully open for 'normally open' valves (n/o). Taking into account the
typical process conditions under which the instrument is used (such as the processed media and ambient conditions; see
also
), the default state is generally considered safe.
Check the serial number label or the
to see which valve type is used on your instrument (if
applicable).
3.5
Manual controls
On top of the housing, the instrument is equipped with two LED indicators and a multifunctional
switch, which can be used to monitor the instrument visually and start several functions manually.
3.5.1
LED indications
The LEDs on top of the instrument indicate the operational state. The meaning of some indications depends on the specific
fieldbus interface of the instrument (if installed).
l
Mode/MOD Operational mode
l
Error/NET
Error/warning indication
l
Green
Pattern
Time
Indication
off
continuous
Power off or program not running
on
continuous
Normal operation mode
short flash
0.1 sec on,
2 sec off
No communication, valves are in
blink
0.2 sec on,
0.2 sec off
Instrument is busy performing a special function
long flash
2 sec on,
0.1 sec off
Configuration mode; the 9-pin D-sub connector is set for RS-232 communication
(
) at 38400 Baud
