FISCHER DA01 VUW ATEX, Operating Manual, Page: 21 / 32

FISCHER Mess- und Regeltechnik GmbH Technical Data | 6
BA_EN_DA01_VUW 21 / 32
6.4.1 Additional Attachments
6.4.1.1 Contact elements
Limit signal transmitters (contacts) and capacitive rotation angle transducers
with an output signal proportional to the angular position can be fitted into a
housing augmented by a corresponding bayonet ring connector.
A certain minimum pressure level is required to operate this kind of contact ele-
ment, which is why there is a lower limit for the mbar measuring ranges. This
limit depends on the model type and is stated in the section ‚General‘.
The measuring deviation increases by ±0.5% per contact when the contacts are
driven and switched.
For more information and the order key, please refer to the data sheet:
• for limit switch in data sheet KE
• for rotation angle converter in the data sheet KE09
6.4.1.2 Fluid charging
Under aggravated operating conditions, such as vibrations and extreme pres-
sure fluctuations, or in order to avoid condensation forming if used outdoors, the
casing can be filled with the following fluids depending in the type of contacts in-
stalled:
without contacts Glycerine, silicon oil
Low-action contacts Silicon oil
Magnetic spring contacts Silicon oil
Inductive contacts Paraffin oil
Rotation angle transducer no filling possible
6.4.1.3 Marker needle
A settable red marker can be attached to the scale to clearly show a certain
pressure (limit value).
6.4.1.4 Trailing needle
The railing needle is 'dragged' with the measured value indicator. As there is no
fixed connection between the two needles, one-off maximum values are stored.
The trailing needle can be reset using an adjusting dial in the window. Trailing
needles cannot be used in conjunction with contacts. A certain minimum pres-
sure level is required to move the drag indicator, which is why there is a lower
limit for the mbar measuring ranges. This limit depends on the model type and
is stated in the section ‚General‘.
6.4.1.5 Shut-off fitting
3-spindle valve block PN 100, DN 5, can be directly flanged
• Type DZ3600SV2700
• Material 1.4571
• Functions: Shut-off, pressure compensation