Calibration Of Nivotester Ftc 420 With An Uncovered Probe; Conductive Build-Up On The Probe; Controls; Nivotester 420, Calibration - Endress+Hauser nivotester FTC 420 Operating Instructions Manual

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).
Adjuster for
switch point
Fig 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).
Switch position Range
I
II
III
Green LED
Operational status
Hook switch for
capacitance range
(Table 3)
Red LED
Relay status
Input voltage Capacitance
3...6.6 V 10...100 pF
6...8.8 V 80...180 pF
8...12 V 160...350 pF
Fig. 10
Calibration controls of
Nivotester FTC 420

Controls

Table 3
Capacitance value as a function of
hook switch position
31