WIKA FLM - Handbuch (Seite 9)

GB
WIKA operating instructions level sensor model FFG 9
13445627.01 12/2010 GB/D/F
3. Area of application
The level sensor system is available for employment in varying container
heights of between 200 and 6000 mm. Flange-model or screw-model
designs are available allowing a stepless positioning within the contai-
ner, depending on the design thereof.
Probe tube and float can be installed up to the screw element or flange
in areas exposed to danger of explosion, in which electric units of the
category 1/2 (zone 0) are required. In respect of the bypass model, the
complete system is allowed to be installed in areas exposed to danger
of explosion that require electric unit of category 2 (zone 1). The sensor
head of the level sensor can be operated at ambient temperatures
of between -40 ... +85 °C, while the sensor tube is operable within a
temperature range of between -25 ... +250 °C. The permitted process
temperatures in case of employment in zones subject to danger of
explosion that require operating units of categories 1/2 or 2, are set out
in the tables.
The technical specifications set out in these operating
instructions should be observed.
4. Assembly
Assembly and servicing in areas exposed to danger of
explosion shall be in accordance with the provisions
stipulated by ElexV and the Act on Appliance Safety
and shall be in accordance with all applicable rules
of technology and the present operating instructions.
Moreover, please also observe all local safety and
accident preventing regulations that have not been
expressly mentioned in these operating instructions.
Make sure, during assembly that the probe tube is not
bent and that the float is not exposed to shock.
The level sensor having Ex-approval must be so
mounted that the probe head is not located in the
Ex-zone 0.
3. Area of application / 4. Assembly