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Safety instructions
2.5 Measurement of oxygen in hydrogen with Oxymat 6E
2.4.5
CALOMAT 6E
Explosion hazard
Frequently or permanently explosive gas mixtures must not be connected.
Rarely or occasionally explosive gas mixtures may be connected in accordance with the special
conditions specified in the corresponding certificates.
Ensure that no absolute sample gas pressures higher than 1.1 bar (110 kPa) can occur.
During installation in a control cabinet, an air exchange ratio of at least 1/h has to be ensured
through corresponding ventilation measures.
If the sample gases may occasionally be explosive, suitable flame arrestors have to be
installed in the sample gas inlet and outlet lines of the CALOMAT 6E gas analyzer. A flame
arrestor can be omitted at the outlet of the device if the sample gas is routed into a
non-hazardous area. When discharging the exhaust gas into an explosion-free area, a flame
arrestor at the device outlet can be dispensed with.
2.5
Measurement of oxygen in hydrogen with Oxymat 6E
NOTICE
Explosive gas mixtures
Gas mixtures of hydrogen H
pressure of 1000 hPa and 20 °C ambient temperature, the lower explosive limit (LEL) lies at 4 %
H
in O
2
the LEL lies at 3.8 % H
In general, a distinction is made between the following cases at the occurrence of explosive
gas mixtures:
• Frequently or constantly explosive - more than 1000 hours/year
• Occasionally explosive - 10 to 1000 hours/year
• Rarely explosive - less than 10 hours/year
20
DANGER
2
, the upper explosive limit (UEL) at 95.2 % H
2
in O
2
2
in oxygen O
are explosive in a wide range. At an atmospheric
2
2
, the UEL lies at 95.4 % H
Compact Operating Instructions, 01/2024, A5E45779144002-AB
in O
. At an ambient temperature of 80 °C
2
in O
.
2
2
Series 6 and ULTRAMAT 23
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