Figure 10: charging in safe area
Trickle charge kit
An intrinsically safe power supply (Figure 11: trickle charger connection provides power
to the monitor while it is located in hazardous area through a dedicated connector on
the left side (Figure 2, ref. 5). In this configuration, the internal battery is charged very
slowly. The current supplied by the trickle charger is mostly used to power the electrical
circuits.
Intrinsically safe power supply (trickle charger) features:
■ Io ≤ 160 mA.
■ Pmax= 1.2 W.
■ Maximum cable resistance = 16 ohm, based on a maximum cable length of 500
meters (AWG 16 – 1,5mm²).
Trickle chargers are available with 25, 50 or 100 meters of cable. The dual charging
kits are intended for use with BM 25/25W monitors equipped with two high current
draw sensors (catalytic, infrared, PID) or when the pump is continuously running. Only
intrinsically safe power supplies provided by OLDHAM can be used.
Insert the male connector (Figure 11, ref. 6) from the trickle charger (ref. 1 and 3) into
the port with a black ring that is located on the left side of the BM 25/25W (ref. 4).
Connect the other end of the power supply (ref. 2) to the mains and only in areas
known to be safe.
The trickle charge connector (Figure 11, ref. 1) must be located in a non-
hazardous location. The BM 25/25W can be used in hazardous area while
trickle charging.
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