The calibration is exactly as described on Pages 31 - 33, i.e. for
•
an uncovered probe
•
a covered probe or
•
with a variable level.
Proceed as appropriate:
Step Procedure
1
Check that the time delay adjuster is at the zero position.
2
Select the capacitance range as described on Page 32,
using hook switch 1.
3
If there is no bridge between terminals 12 and 13 of the
Nivotester,
- calibrate for minimum fail-safe mode as described in on
Page 32 with uncovered probe or Page 33 with covered
probe or variable level.
or
If there is a bridge between terminals 12 and 13 of the
Nivotester,
- calibrate for maximum fail-safe mode as described on
Page 32 with uncovered probe or Page 33 with covered
probe or variable level.
4
When adjusted, check that the unit is functioning correctly
by filling or emptying the vessel.
Adjustment of switching
delay
Now set the switching delay time at hook switch 2.
Step Procedure
1
Set hook switch 2 to the mode required, see Table 4.
2
Turn adjuster 2 clockwise to set the switching delay
(ca. 0.5 ... 20 s). The adjuster is not linear.
- A rising or falling level can be simulated as described in
»Trouble-shooting« on page 36.
Calibration procedure
Nivotester FTC 421
Calibration
35
