Ampcontrol Pty Ltd
– ABN 28 000 915 542
GG2 DISPLAY USER MANUAL
GG2B023 Version 3
– JUNE/19
Uncontrolled Copy - Refer to Ampcontrol Website for Latest Version
Page 59 of 82
A
P
P
R
OV
E
D
FOR
E
X
T
E
R
N
A
L
D
IS
TR
IB
U
T
ION
–
P
R
OP
E
R
T
Y
OF
A
M
P
C
ON
TR
OL
P
T
Y
LTD
–
N
O
T
T
O
B
E
R
E
P
R
OD
U
C
E
D
I
N
P
A
R
T
In Figure 68, t
he value decreases below the SP2 value, but doesn’t go smaller than the SP2 hysteresis
value, therefore the flag doesn’t get cleared. In this scenario there are only two transitions, one to set
and one at the end (on the right) to clear.
The hysteresis value is a percentage of the detectors span value, i.e. for a 0-5% v/v CH4 sensor a
hysteresis setting of 3% corresponds to 3% of 5% which is 0.15%. The hysteresis value must be
between 0% and 7.5% of the span value, with options increasing by 0.5% each step. The hysteresis will
act on all of the setpoints and the hysteresis threshold, i.e. the dotted yellow line (hysteresis value), will
always be closer to the healthy region (as shown in Figure 69). This can be summarised as:
Reaching the setpoint value when moving away from the healthy region will instantly set the
respective setpoint flag.
Crossing the setpoint value when moving toward the healthy region will not trigger a change.
Crossing the setpoints’ hysteresis value (dotted lines) when moving toward the healthy region will
clear the respective setpoint flag.
Figure 69: Hysteresis Value for each of the Setpoints
6.6 System Status and Information
Status
The status titles are shown on the screen whenever status flags are set. If multiple status flags are set,
the titles will change every five seconds. There may be a maximum of five status flags set in the system
at any time.
Figure 70: The HOME Screen with a Status Title "FAST PRESSURE CHANGE"
The STATUS screen can be accessed from the menu (Section 6.1.2) and provides more detail about the
current status flags. Once on the status screen, provided that there are multiple status flags, up and/or
down presses will change the display to the next/previous status.
As can be seen in Figure 71, the periodically changing status titles will be shown on ALL screens. The
