Ampcontrol Gasguard 2 GG2 DETECTOR - Markings; Electrochemical Sensors; Table 1: Minimum Marking Information; Table 2: Optional Marking Information

Ampcontrol Pty Ltd – ABN 28 000 915 542
GG2 DETECTOR USER MANUAL
GG2B011 Version 3 – June/19
Uncontrolled Copy - Refer to Ampcontrol Website for Latest Version
Page 13 of 39
APPROVED FOR EXTERNAL DISTRIBUTION
– PROPERTY OF AMPCONTROL PTY LTD
– NOT TO BE
REPRODUCED IN PART
3.4 Markings
Table 1: Minimum Marking Information
THE MINIMUM MARKING MUST CONTAIN THE INFORMATION IN ONE OF THE FOLLOWING
CELLS
AMPCONTROL
GG2 DETECTOR
NDIR
IECEx TRA 16.0020X
Ex ia I Ma
-20°C ≤ Ta ≤ +40°C
SERIAL: XXXXX
AMPCONTROL
GG2 DETECTOR EC
IECEx TRA
16.0020X
Ex ia I Ma
-20°C ≤ Ta ≤ +40°C
SERIAL: XXXXX
AMPCONTROL
GG2 DETECTOR
CAT
IECEx TRA 16.0020X
Ex ia I Ma
-20°C ≤ Ta ≤ +40°C
SERIAL: XXXXX
AMPCONTROL
GG2 DETECTOR
SENSOR
IECEx TRA 16.0020X
Ex ia I Ma
-20°C ≤ Ta ≤ +40°C
SERIAL: XXXXX
Table 2: Optional Marking Information
Optional Marking Information
Connector P1
Pin
Function
Entity Parameters
1
Power
Ui: 16.5V
Ci: Negligible
Li: Negligible
2
Ground
3
Data -
4
Data +
5
Chassis
3.5 Electrochemical Sensors
3.5.1 Oxygen and Carbon Monoxide Gas Sensors
Oxygen and Carbon Monoxide Gas Sensors work on the principles of chemical oxidation and
reduction. Electrochemical gas sensors contain electrodes, which promote a chemical reaction with the
target gas when an electrical potential is applied. The chemical reaction of target gas within the sensor
creates a current, which is proportional to the rate of target gas consumption. By measuring this
current, the volume fraction of target gas can be calculated and converted into a digital value by the
integrated sensor electronics. The GG2 Detector is temperature compensated and provides a linear
output.
3.5.2 Humidity
Electrochemical sensors contain an electrolyte, which is a key component of sensor operation. Under
low humidity conditions, the electrolyte can dry out leading to permanent sensor failure. Under high
humidity conditions, the electrolyte can absorb too much water and leak from the sensor.
For Oxygen and Carbon Monoxide, the sensor can be operated in a non-condensing relative humidity
of 15% to 90% continuously.
3.5.3 Pressure Effects
Electrochemical sensors are sensitive to the effects of pressure and should not be operated outside of
their stated range of ±20 kPa.
3.5.4 Air Velocity
Electrochemical sensors are insensitive to typical air velocities.