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➔ The user keys are used for menu navigation and
parameter setting purposes.
symbol Description
oK
Press the OK key to confirm a selection
or query.
UP/DoWn navigation
to navigate in the menu or to increase/
reduce a value. Press and hold the key
to continuously increase or reduce a
value.
Reset
Press and hold the Reset key until the
display is reset.
Back
The Back key enables you to navigate
back in the menu hierarchy.
5.1 Backlight
Pressing any key for less than 0.5 s switches on the
backlight. The backlight will switch off again 30 s
after the last key is pressed.
6 LeDs (CoLoUR/FLAsH CoDe)
Two changing colour LEDs show the status of the
MAX/MIN function or a message.
➔ If the MAX/MIN function is disabled, the LEDs
remain off during normal operation.
Colour and flash code
➔ The details refer to values which are parameter-
ized, see Parameters.
Col-
Meaning
Mode
our
MAX LeD
Perma-
Red
Alarm
Yel-
Perma-
Warning
low
Perma-
Green
OK
Description
The pressure is
greater than or equal
to the setting value
nent
for the "MAX alarm"
NFS parameter.
The pressure is
greater than or equal
to the setting value
nent
for the "MAX
warning" NFS
parameter.
The pressure is less
than the setting
values for the "MAX
alarm", "MAX
nent
warning" and "MAX
switching value" NFS
parameters.
Col-
Meaning
our
Red
Record
MIn LeD
Red
Alarm
Yel-
Warning
low
Green
OK
Red
Record
MAX LeD and MIn LeD
Yel-
Initializa-
low
tion
Setting
Yel-
the zero
low
point
Red
Alarm
Overpres-
Red
sure
detected
Overpres-
Red
sure
active
Perma-
Yel-
nent
low
remote
reset
Too many
Red
remote
resets
EN-4
Mode
Description
The pressure is
greater than the
Flash-
setting value for the
ing
"MAX switching
(1 Hz)
value" NFS
parameter.
The pressure is less
than or equal to the
Perma-
setting value for the
nent
"MIN alarm" NFS
parameter.
The pressure is less
than or equal to the
Perma-
setting value for the
nent
"MIN warning" NFS
parameter.
The pressure is
greater than the
setting values for the
Perma-
"MIN alarm", "MIN
nent
warning" and "MIN
switching value" NFS
parameters.
The pressure is less
Flash-
than the setting
ing
value for the "MIN
(1 Hz)
switching value" NFS
parameter.
Perma-
The unit is in
nent
Initialization mode.
Flash-
Ready for zero point
ing
adjustment (no fault
(5 Hz)
may be active)
Perma-
Internal device error
nent
Overpressure has
been detected and
Flash-
the pressure is now
ing
back below the limit
(1 Hz)
value (the unit must
be reset and
checked)
Flash-
Overpressure active.
ing
The pressure must
(5 Hz)
be shut down.
Permanent remote
Flash-
reset (a warning is
ing
issued only if remote
(1 Hz)
reset is parameter-
ized)
Too many remote
Flash-
resets (a fault
ing
lock-out occurs only
(1 Hz)
if remote reset is
parameterized)
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