Navigator 500
Sodium analyzer
3 Installation
14
OI/ASO550–EN Rev. G
3.4 Electrical connections – wet-section
3.4.1 Solution ground
A stud terminal is located on the left hand side of the flow cell, see Fig. 2.1, page 6. This stud is provided so that the solution can be
grounded to ensure there is not a build up of static charge. Static charge can build up when high purity liquids flow over
non-conductive surfaces and may result in a noisy signal output. It is recommended that a 16/0.2 mm wire (green/yellow outer
insulation) is connected from the flow cell stud terminal of each wet-section to the nearest suitable equipotential earth; for example
the earth stud on the transmitter.
3.4.2 Accessing the wet-section PCB
This section is applicable only for multiple wet-section systems.
Referring to Fig. 3.11:
1. Open the wet-section door by releasing the 2 door locks
A
.
2. Remove the 4 screws
B
and associated plastic screw retaining washers
C
holding the wet-section PCB cover in place and
remove the cover.
3. Feed the supplied communications cable through the channel in the rear corner of the main case (as fitted cable), then through
the cable gland and make the connections shown in 3.12, page 15.
Note.
For single wet-section systems, the Modbus cable is connected to the wet-section at the factory – only transmitter
connections are required.
If additional wet-sections are added they must be connected in series – refer to Appendix C, page 78.
The following procedure is required only when connecting additional wet-sections to an existing analyzer.
Warning.
Isolate power supplies to the transmitter and wet-section before attempting to access the wet-section PCB.
Note.
When refitting the cover, ensure that the O-ring seal
D
in the PCB housing is located correctly in its groove.
Fig. 3.11 Accessing the wet-section PCB
Stud terminal (ground)
