GASMAX II + GDS-IR Operation & Maintenance Manual, Revision 1.1
Page 27
ALARM SETTINGS PAGE
The Alarm Settings page covers the Alarm 1, 2, 3 Setup and Event Log menu items. Alarm 1, Alarm 2 and
Alarm 3/Fail menus are identical and are therefore described only once. If the optional alarm relays are
not installed, the alarm settings only affect the operation of the front panel LEDs. In that case, separate
alarm settings may need to be programmed in the 4-20mA receiving device.
Figure 7-4: Alarm Settings Menu
SET POINT
enters the engineering unit value where the alarm trips. It may be negative and trip when
monitored values fall out of range in this direction. A3 has a default setting of negative 10 with Low Trip
set for YES. This makes it function as a FAULT alarm and trip when the monitored value falls below
“
-10
”
.
It is important to ad ust this value when the transmitter’s span value is set for another value other than
100. For example, a typical span setting for monitoring oxygen level is 0-25.0(%), therefore the fault level
value should be adjusted to -2.5 which is equivalent to negative 10% of full scale.
DEAD-BAND
has a minimum value of 1% and a maximum value of 10%. It is useful for preventing alarm
cycling when the monitored value is hovering around the set point.
EXAMPLE: With a range of 0-100 ppm, if Dead-Band equals 5% and the set point is 20 ppm, after tripping
at 20 ppm the value must drop below 15 ppm to reset.
ON DELAY
allows entering a maximum 10 second delay before this alarm becomes active. This is useful
for preventing nuisance alarms caused by brief spikes beyond the set point.
OFF DELAY
allows entering a maximum 120 minute delay before clearing an alarm after the alarm
condition is gone. This is useful for continuing an alarm function, such as operation of an exhaust fan, for
a period of time after the alarm condition clears.
LOW TRIP
set to YES causes the alarm to trip as the value falls below the set point.
LATCHING
set to YES causes the alarm to remain active even after the condition is gone and only reset
when the UP / RESET key is pressed from a data display.
A L A R M
S E T T I N G S
A l a r m
1
A l a r m
2
A l a r m
3 / F a i l
R e l a y s
C o n f i g .
A l a r m
E v e n t
L o g
A L A R M
x
S E T U P
S e t
P o i n t
2 0
D e a d - B a n d
1 %
O N
D e l a y
0 s
O F F
D e l a y
0 m
L o w
T r i p
N O
L a t c h i n g
N O
A la r m 1 , 2 , 3 m e n u s
a r e id e n t ic a l
>
>
>
>
>
R E L A Y
C O N F I G
K 1
F a i l s a f e
N O
K 2
F a i l s a f e
N O
K 2
A c k n o w l e d g e
N O
K 2
R e f r e s h
O f f
* K 3
a l w a y s
F a i l s a f e *
E V E N T
L O G
D i s p l a y
E v e n t
L o g
C l e a r
E v e n t
L o g
0 8 / 1 2 / 0 4
0 3 : 1 7
A 1
I N
0 8 / 1 2 / 0 4
0 3 : 5 1
A 2
I N
0 8 / 1 2 / 0 4
0 3 : 5 5
A C K
0 8 / 1 2 / 0 4
0 4 : 1 6
A 2 O U T
0 8 / 1 2 / 0 4
0 4 : 2 3
A 1 O U T
0 8 / 1 2 / 0 4
1 5 : 0 0
A 1
I N
0 8 / 1 2 / 0 4
1 6 : 4 3
A 1 O U T
0 8 / 1 3 / 0 4
0 2 : 0 8
A 3
I N
E d it
0 8 / 1 3 / 0 4
0 2 : 1 8
A 3 O U T
- - - E N D
O F
L O G - - -
D o w n
