Xylem SDI-12 RADAR - Manual (Page 14)

remember that grounding should be simple. if your system grounding is getting complicated,
something is wrong. The purpose of grounding is to remove ground loops. Ground loops without
getting into a technical physics discussion, are the source of most equipment field failures. at the
gauge house, use a simple Single Point Ground as shown in the above illustrations. remove any
multiple or redundant ground wires. Keep your wires neat and clean. Things that look good seem
to work good.
iNSTaLLaTioN & maiNTeNaNCe
12
The radar is supplied with a 6-foot, 4-conductor polyurethane cable for making convenient
connections to your data logger. The cable is routed thru a liquid tight cord connector on the radar
housing and is waterproof and sunlight resistant. The radar is a SDi-12 V1.3 compliant sensor and
connects directly to any data recorder with SDi-12 capability.
Connecting Your Data Logger
4-Conductor Cable
Color Function
red
white
Black
Green
+12V Power
SDi-12 Data
Gnd
Gnd
if the 6-foot cable is unsuitable for your application it may be removed and replaced with a longer
cable. internal to the radar housing, the SDi-12 interface module has a removable 3-position
connector for making the SDi-12 connections. The SDi-12 connections provides both +12V power
and SDi-12 serial data communications. You will need a 1/8 inch blade screwdriver to connect the
wires to the plug-in connector. The connections inside the radar housing may be accessed with the
following procedure:
1. Disconnect the power supply
2. Unscrew the housing cover (the round casting with the glass window). Do not contaminate
or dislodge the o-ring seal in the cover
3. remove and unplug the LCD display module
4. remove the cover plate from the terminal compartment
5. Disconnect the 3-position green connector
6. Loosen the nut on the liquid tight connector
7. Unseat (loosen) the rubber grommet in the liquid tight connector
8. remove the existing 4-conductor cable
if your cable has a dedicated ground wire, connect it to the internal ground screw on the bracket
(the bracket is grounded to the enclosure).
NoTe: This device must not include, or make provisions for, the use of battery chargers which permit
operating while charging, aC adapters or battery eliminators and must not connect to the aC power lines
indirectly, obtaining power through another device.