Replacement Of The Nivotester - Endress+Hauser nivotester FTC 422 Installation And Operating Instructions Manual

Installation
Fail-safe mode:
without bridge 12-13: Min. fail-safe mode
with bridge: Max. fail-safe mode
NIVOTESTER
FTC 422
Core
Relay output
DC
or
AC
Power
supply
Fig. 6 shows the connection of the probe to the Nivotester.
• The probe is grounded to terminal 6 of the electronic insert.
Fig. 7 shows the connection of two probes. The first probe is
grounded to terminal 6 of the electronic insert. The second probe
is connected to the first by a low capacitance HF coaxial cable.
• Connect the central core of the coaxial cable to the centre
connecting point of the probes.
• Connect the shielding to ground connection in the probe head.
• The probe head containing the electronic insert should be fitted
with a twin cable conduit so that it can be tightly sealed.
• Terminals 1 and 2 of the electronic insert must be short-circuited.

Replacement of the Nivotester

The Nivotester can be replaced without the need to rewire.
Step Procedure
1 Release the terminal blocks by inserting a screwdriver
blade into the release point, see Fig.3, and prising them
apart.
2 Release the snap-on fastening by inserting a screwdriver
blade in the release point and prising downwards.
3 Remove the old unit, snap the new unit onto the mounting
rail.
4 Press home the terminal blocks, 6-pole below, 7-pole
above the front panel.
5 Calibrate the unit as described in Chapter 3.
Ground
connection in
probe head
Bridge 1-2
Shielding
Coaxial cable
Fig. 7
Connection diagram:
Nivotester FTC 422 to two probes
Single probe
Two probes
Procedure:
Exchanging the Nivotester
25