23
9.2.7 Alarm output status: no.nc
This function allows the alarm output to be
open or closed in the alarm condition. When
deciding which is required, care must be taken
to ensure that the alarm output is fail safe.
See Fig 10.
CAUTION
When the 4/20mA supply is
removed both alarm outputs will
open
irrespective
of
conditioning. Therefore for fail
safe
operation
both
alarm
outputs should be programmed
to
be
open
in
the
alarm
condition.
To check or change the alarm output status
select 'no.nc' from the alarm menu and press
P
reveal the current setting. The function can
be changed by pressing the
Up
or
Down
button followed by the
E
button to return to the
alarm menu.
9.2.8 Hysteresis: HStr
During programming hysteresis is shown in the
units the indicator has been calibrated to
display.To adjust the hysteresis, select 'HStr'
from the alarm menu and press
P
which will
reveal the existing figure. Each digit can be
adjusted using the
Up
and
Down
push buttons,
and the
P
button to move to the next digit.
When the required hysteresis has been
entered, press
E
to return to the alarm menu.
Fig 14 Alarm Programme Menu
P
P
E
ALr2
E
As ALr1
AcSP
P
E
E
EnbL
On
P
E
E
P
Cond
ALr1
E
E
0000
AcCd
C - - P
E
E
Alarms
Main menu
Main menu
Access Enable
or
to toggle
between
On and OFF
Security Code
For Direct
Access to
Setpoints
Enter code by
pressing
and
to move to
next digit
Code 0000
allows direct
access
P
Access to setpoints from display mode
OFF
EnbL
P
E
Alarm Enable
or
to toggle
between
On and OFF
E
SP1
00.00
P
E
E
Setpoint
Enter by
pressing
and
to move to
next digit
P
High or Low
Alarm
or
to toggle
between
HI and LO
E
HI.LO
LO
P
E
Normally Open
or Closed
Output
or
to toggle
between
no and nc
E
no.nc
nc
P
E
E
HStr
00.00
P
E
Hysteresis
Enter by
pressing
and
to move to
next digit
Not available
for total alarms
P
E
dELA
0000
P
E
Alarm Delay
Enter by
pressing
to move to
next digit
P
and
E
0000
P
E
SIL
Alarm Silence
Time
next digit
to move to
pressing
Enter by
and
P
Display alarm
identification
0000
P
E
FLASH
E
or
to toggle
between
On and OFF
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