Oldham BM25 Operating Manual

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• The BM25 gas detector is a stand-alone gas detector that can be used in explosive gas
atmospheres according to directive ATEX 94/9/EC, the Canadian Electrical Code, and
international standard IEC 60079-10-1. It provides simultaneous detection of up to 5 gases
present in the air by means of sensors specific to each risk to be evaluated (under-oxygenation,
explosive or toxic gases).
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1
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. POWER
1.1. Power supply
The BM25 is powered by an interchangeable and rechargeable battery pack.
Under normal operating conditions, and depending on the sensor configuration, operating runtime
varies between a minimum of 75 hours and a maximum of 170 hours (100 hours standard).
The power supply unit is a NimH 7V2 / 9AH battery pack.
1.1.1. Charging the battery pack
A lateral connector allows the battery pack (see the section on CHARGERS) to be charged without
dismantling.
1.1.2. Trickle charge
You can trickle charge your BM25 continuously in a classified area to keep the charge level
constant (except in alarm conditions) for as long as needed by means of an intrinsically safe power
supply.
1.2. Memory saving
A lithium battery (non rechargeable) ensures the storage of the BM25 gas detector's specific data
(time/history), especially when the instrument is out of service (off mode) or without the battery
pack (main power supply).
This lithium battery has a maximum service life of two years without the main power supply
(battery discharged or internal switch in “off” position).
IMPORTANT: The instrument is approved for explosive atmosphere operations, only when
it is equipped with batteries of a type recommended by the manufacturer.
Switch instrument to “off” before any maintenance operation, such as:
battery replacement.

Oldham BM25 Specifications

General

Brand	Oldham
Model	BM25
Category	Measuring Instruments
Language	English