ATEX areas and general rules
If the device is used in a contaminated atmosphere, the catalytic sensor must be
calibrated it before its next use.
Silicon vapors or other contaminants may have an adverse effect on
catalytic sensors (slot 1) for combustible gas detection, and may distort
measurements (under-estimated measurements).
The gas monitor can be used in explosive atmospheres in Group II surface industries
and Group I mines containing firedamp.
The ambient temperature range for use is from –20° C to + 55° C.
Depending on the type of sensors used on the device, categories covered by the gas
monitor are:
a) BM 25/25W without infrared sensors
■ Surface industries: Category 1G, use in zones 0, 1 or 2
■ Mines containing firedamp: Category M1, for use in all gas levels
b) BM 25/25W with infrared sensors
■ Surface industries: Category 2G, use in zones 1 or 2
■ Mines containing firedamp: Category M2, for use below a certain concentration of
gas
The following operations are prohibited in explosive atmospheres:
■ Opening of the instrument: sensors cover or rear cover.
■ Charge the batteries using a universal or vehicle charger.
■ Link-up with a computer.
All servicing, adjustment and maintenance operations must be performed by duly
approved personnel.
The battery pack must be replaced by the original part specified by the manufacturer –
OLDHAM P/N 6311082.
Input/output parameters
Gas monitor recharge connector
The charger provided by OLDHAM should only be used outside of the ATEX areas.
When the recharging is done by a charger other than the one provided by OLDHAM, its
characteristics must not exceed a voltage of 30VDC and a current of 30 A.
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