KROHNE BM 26 A EN - Manual (Page 4)

4 Installation and Operating Instructions BM 26 A
General advice on safety
This manual gives a complete set of instructions for the installation, operation and maintenance of
the ATEX version of the BM 26 A Bypass Level Indicator.
This instrument is designed to function at near constant pressure conditions.
The instrument must be installed and used by suitably qualified personnel.
Our conformity declaration is limited to the parts of the level indicator that are under pressure,
excluding parts that may be dismantled (e.g. valves).
Events that are not taken into account in the calculations include: exceptional risks such as
earthquakes, bad weather, acts of destruction (such as sabotage, terrorism, vandalism, etc.) and
fire.
WARNING
Special regulations are applicable to the use of equipment in hazardous locations,
and these are described in this booklet. Data is supplied on explosion protection.
Special measures must be taken when using titanium floats in order to avoid
friction between the titanium and stainless steel causing sparks in an inflammable
gaseous environment.
The standard design calculation does not take into account the theoretical
coefficient of corrosion. The product circulating in the vessel must not have
properties that give rise to surface erosion.
Description: BM 26 A bypass level indicator with magnetic flaps or bar scale
The BM 26 A bypass level indicator is used for measuring level, interface or volume in open or
pressurized tanks. It is mounted adjacent to the tank and uses the principle of communicating
vessels – the liquid level in the measuring tube corresponds to the liquid level in the tank. Due to its
design, the unit is suitable for use in connection with corrosive, toxic or flammable substances and in
severe service conditions.
The local indicator consists of:-
• A bar indicator (follower magnet) in a Pyrex glass tube as standard
• or a flap indicator (yellow/black magnetic flaps) in a Pyrex glass tube.
No power is required for local liquid-level indication.
Optionally, the unit can be equipped or retrofitted with an electrical analogue level transducer
system and/or limit switches.
Use in hazardous areas
The BM 26 A bypass level indicator is approved for use in explosive atmospheres when equipped
with the appropriate options. It is imperative that the approval certificate details and boundary
conditions are observed.