Ampcontrol Gasguard 2 - Page 10

Ampcontrol Pty Ltd – ABN 28 000 915 542
GG2 COMMUNICATIONS USER MANUAL
GG2B032 Version 1 – JULY/2020
Uncontrolled Copy - Refer to Ampcontrol Website for Latest Version
Page 10 of 22
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– PROPERTY OF AMPCONTROL PTY LTD
– NOT TO
BE REPRODUCED IN PART
Bit
Description
Value
iMAC
Exception
Trigger?
R/W
Application Notes
SCADA*
7
System fault
1 = System
has detected
a hardware,
Detector or
software fault.
0 = No fault in
operation
detected.
Yes
R
System fault
E.g. sensor head missing /
display <-> head comms
fault, etc.

8
Cal cup on
1 = Cup on
Yes
R
The GG2 senses the
magnets in our approved cup
(E.g. bump test, zero / span
adjust, calibration)
9
Gas Value
Invalid
1 = Analogue
4-20mA gas
reading is not
reflecting the
real world gas
value.
Yes
R
Analogue 4-20mA gas
reading is not reflecting the
real world gas value. (I.e. it is
currently in fault or warmup
or otherwise unreliable. This
includes the sensor being in
warmup, even if 4-20mA is
returning the sensor value
during warmup).

10
Detector
Head
Warmup
1 = Warmup
busy
No
R
GG2 Detector currently in
warmup mode

11
Linearity
test due
1 = Linearity
test due
No
R
International Laboratory
Accreditation Cooperation
Mutual Recognition
Arrangement. Linearity (i.e.
NATA) test is now overdue.
12
Overrange
latch on
CH4
catalytic
detector
OR
NDIR
incomplete
adjustment
1 =
Overrange
latch on CH4
Catalytic
detector
OR
IR adjustment
incomplete
Yes
R
Overrange latch on CH4
catalytic detector
CH4 has exceeded full scale.
The sensor is switched off to
protect it from damage.
OR
NDIR incomplete adjustment
Non dispersive Infra Red
sensors had an incomplete
calibration sequence. This is
unique to this sensor type. In
short, once you start
zero/span adjustment, the
values are wiped at the start.

13
Hardware
fault
1 = Hardware
fault
Yes
R
A fault which
impedes/prevents gas
detection/other critical
function has been detected.
