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 28 of 82
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CAUTION!
GG2 Detectors should be NATA calibration at least every 6 months to
ensure their proper operation.
NOTE
Human breath contains a high concentration of CO
2
and this may cause
the CO
2
instrument to read above zero.
NOTE
Direct human breath contains approximately 100% relative humidity and
a large humidity spike may cause the instrument to temporally report
incorrectly.
Table 6: Recommended Calibration Gases
Sensor Type
Zero Gas
Span Gas
GG2 Detector NDIR CH
4
5%
Synthetic Air or 100%
Nitrogen
2% CH
4
mixed with Synthetic Air or
100% Nitrogen
GG2 Detector NDIR CO
2
5%
Synthetic Air or 100%
Nitrogen
1
st
point <2.0% CO
2
and 2
nd
point >3.0%
CO
2
mixed with Synthetic Air or 100%
Nitrogen
GG2 Detector NDIR CO
2
2%
Synthetic Air or 100%
Nitrogen
1% CO
2
with Synthetic Air or 100%
Nitrogen
GG2 Detector CAT CH
4
5%
Synthetic Air
2% CH
4
balance with Synthetic Air
GG2 Detector EC CO 100ppm
Synthetic Air
50ppm CO balance with Synthetic Air
GG2 Detector EC CO 50ppm
Synthetic Air
25ppm CO balance with Synthetic Air
GG2 Detector EC O
2
25%
100% Nitrogen
<18% Oxygen balance with synthetic air
5.3 Electrochemical and Catalytic Zero Test
The zero test is intended to check the constant error (sometimes called the
‘zero offset’ or ‘d.c. offset’) of
the instrument, that affects all readings regardless of the gas concentration.
The detector shall be exposed to zero gas using the recommended gas listed in Table 6.
The following instructions detail the ZERO ADJUSTMENT procedure.
1. Access the GG2 maintenance menu via the display UI using the magnetic calibration tool. Refer
to Section 6.1 for an overview of navigating the user interface and the menu structure.
2.
Access the “GAS CALIBRATION” menu.
