FISCHER NC56, Руководство по эксплуатации, Страница: 9 / 24

FISCHER Mess- und Regeltechnik GmbH Assembly | 3
BA_EN_NC56 9/24
3 Assembly
3.1 General
CAUTION
Risks connected to medium or system
The builder or operator of the tank system must implement suitable protective
measures for installation and maintenance work.
3.2 Process connection
• By authorized and qualified specialized personnel only.
• Assembly only with the delivered process connection.
• Note the maximum permissible operating pressure of 10 bar.
• Check that the device is compatible with the medium being measured.
As standard, the device is intended for assembly in a size 1¼ mounting flange.
If a protection tube is used, a pipe connection suitable for a size 2 mounting
flange is used. The NC56 is suited only for vertical installation and, if possible,
should be mounted at the highest point of the tank.
NOTICE! See also the information about the calibration in the section
"Start-up".
C
A
: Initial capacitance (probe exposed)
C
E
: End capacitance (probe covered)
Shortening 10 mm
Recalibration Factory
calibration
C
A
E
C
C
Distance increase
Probe rods too long
C
S
C
S
: Stray capacitance
C
S min
Fig. 5: Assembly of the NC56
A distance of at least 10 mm between the tank bottom and probe rods must be
observed. If the probe was not ordered in the precise length required, the rods
can be shortened by the user.
In the case of non-conductive fluids and very short electrodes, the impact of the
stray capacitance of the environment will increase. For this reason, the probe
should be installed in the middle of the tank if possible. The further the metal
walls or metal frame from the electrodes, the lower the effect of this stray capa-
citance.
Pulsating impacts on the tank system can cause functional impairments on the
device.