Endress+Hauser nivotester FTC 420 - Calibration of Nivotester FTC 420 with an Uncovered Probe; Conductive Build-Up on the Probe; Controls; Nivotester 420, Calibration

Calibration of Nivotester FTC 420 with an
uncovered probe
This calibration requires that
• the vessel be empty or
• the liquid/solid not be in contact with the probe
(at least 100 mm below its tip).
ControlsFig 10 shows the calibration controls for the Nivotester FTC 420:
• The hook switch matches the Nivotester to the capacitance of the
empty vessel. The settings are summarized in Table 3.
• The adjuster is used to set the switching point.
• The green LED indicates that the unit is operational.
• The red LED indicates that the relay is energised (off) or
de-energised (lit).
Green LED
Operational status
Hook switch for
capacitance range
(Table 3)
Red LED
Relay status
Adjuster for
switch point
Fig. 10
Calibration controls of
Nivotester FTC 420
Switch position Range Input voltage Capacitance
I3
…
6.6 V 10
…
100 pF
II 6
…
8.8 V 80
…
180 pF
III 8
…
12 V 160
…
350 pF
Table 3
Capacitance value as a function of
hook switch position
Calibration
31