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Category Description Terms of facility calibration
A0
Cylinder gases,
stable environment
and
and
No precipitations,
no strong winds,
temperature over
– 10 o C¹ .
In other cases, calibration at a location that meets the above conditions
(necessary to remove the detectors).
A1
Cylinder gases,
unstable environment
or absorption by the
moisture
and
and
and
No precipitations,
no strong winds,
temperature over
+ 10 o C 1 ,
relative humidity under 70%.
In other cases, calibration at a location that meets the above conditions
(necessary to remove the detectors).
A2
Gases not available in
cylinders can be
generated at the relevant
facilities
like A1
In other cases, calibration at a location that meets the above conditions
(necessary to remove the detectors).
A3 Laboratory calibration
Facility calibration impossible, laboratory calibration only, probably at the
manufacturer's.
This group also includes conditions resulting from other reasons, e.g. the
need for temperature compensation, non-linearity of the sensor, the need for
calculation, the use of special tools, etc.
Table 1. Classification of chemicals used at Atest-Gaz. Criterion A: mixture stability
Category Description Classification criteria
B0 Safe substances
and
and
and
or
concentration of flammable components < 60% LEL ,
concentration of toxic components

NDSCh 2 ,
oxygen concentration < 25% vol ,
tank < 3 dm 3 (water capacity) and p

70 atm ,
specified liquid chemical compounds, e.g.: glycerol, 1,2-propanediol.
B1 Low-risk substances
and
and
and
or
or
concentration of flammable components < 60% LEL ,
concentration of toxic components

NDSCh 2 ,
oxygen concentration < 25% vol ,
tank > 3 dm 3 (water capacity) or p > 70 atm ,
toxic gases with the concentration of STEL ÷ 15 x NDSCh ,
specified liquid chemical compounds, e.g.: petrol, acetone, 1-methoxy-
2-propanol.
B2 High-risk substances
or
or
inert gases having an oxygen concentration > 25% vol ,
flammable gases with a concentration > 60% LEL ,
specified liquid chemical compounds, e.g.: styrene, methanol, xylene,
toluene, methyl methacrylate.
B3
Extremely dangerous or
extremely flammable
substances
or
toxic gases with the concentration of > 15 x NDSCh 2 ,
specified liquid chemical compounds, e.g.: benzene, formaldehyde,
formic acid, epichlorohydrin.
Table 2. Classification of chemicals used at Atest-Gaz. Criterion B: OHS
1 Is allowed to perform calibrations at lower temperatures, if they meet the conditions of operation of the detector, e.g. ammonia refrigeration
units.
2 In the absence of determined NDSCh it is necessary to adopt 2 x NDS as a criterion.
Atest-Gaz A. M. Pachole sp. j.
ul. Spokojna 3, 44-109 Gliwice, Poland
VAT No.: PL 9691433231
tel.: +48 32 238 87 94
fax: +48 32 234 92 71
e-mail: contact@atestgaz.pl
p. 2/2 Appendix: PU-Z-039-ENG R01
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