Service – KROHNE BW 25 Ex II 1-2 G EN User Manual

Page 20

SERVICE

BW25

www.krohne.com

03/2010 - 4000862901 MA BW25-Ex-II1/2G-AD R01 en

6.2 Dismantling

Replacing the indicator

Because of the modular design of the liquid level indicator it is possible to replace the indicator
and, if applicable, the electronic components with identical spare parts. The meter process
connections do not need to be removed. This also applies to pressurized processes.

Replacing M9 indicator

If at all possible, the meter should be electrically isolated before removing and replacing the
indicator. If this is not possible, be sure to adhere to the general conditions for intrinsically safe
circuits when removing (e.g. grounding or interconnecting any intrinsically safe circuits.)

Replacing M10 indicator

Before disconnecting the electrical connection cables of the device, make sure that all cables
leading to the converter are isolated from the ground of the hazardous area. This also applies to
equipotential bonding conductors (PA).

The device shall be electrically isolated if it becomes necessary to open the flameproof
electronics compartment enclosure in the presence of an explosive atmosphere. For
temperature classes T6 and T5, be absolutely sure to wait until the time shown on the converter
nameplate has elapsed before opening the flameproof enclosure (8 minutes).

Exchanging the entire device

The same requirements described under "Replacing the indicator" apply for the indicator.

Maintenance

Maintenance work of a safety-relevant nature within the meaning of explosion protection may
only be carried out by the manufacturer, his authorised representative or under the supervision
of authorised inspectors.

CAUTION!
Depressurize process connections prior to removing the meter.
Avoid uncontrolled discharge of residual fluid from the measuring unit.
Where environmentally critical products are concerned, carefully decontaminate the wetted
parts of the measuring tube after dismantling.
Removal and installation are the responsibility of the operator.

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