WIKA BNA - Handbuch (Seite 6)

GB
6 WIKA operating instructions bypass level indicator model BNA
112195.01 11/2012 GB/D
The maximum values specified on the product label
must be observed to guarantee trouble-free operation. At
temperatures over 60 °C, a warning sign has to be attached
to flanges, tubes, case etc., warning explicitly of the danger
of burning and suitable protective measures must also be
taken.
The float has been designed for the medium density
specified on the product label. When the float is used in
liquids with another specific weight, deviations can occur
during measurement.
DANGER!
Work in containers involves the danger of intoxication and
suffocation. No work is allowed to be carried out unless by
taking suitable personal protective measures (e.g. respirato-
ry protection apparatus, protective outfit etc.).
Danger of explosion
Inside the container, there is danger of an explosive atmos-
phere. Corresponding measures for preventing sparking
should be taken. No work is allowed in this area unless by
technically skilled staff in accordance with applicable safety
regulations.
2. Functional description and design
WIKA bypass level indicators work according to the principle of
communicating vessels. The bypass vessel contains a float with a built-
in permanent magnet. This rises and falls with the level of the medium.
Optical and electrical level indicators or limit switches are mounted
to the outside of the bypass tube and actuated by the magnetic field.
Evaluation of the filling level by guided radar is also possible. The fitting
1. Safety instructions / 2. Functional description ...