17
2.5
Wiring
Wiring between the power supply and the Radar transmitter
should be made using 18–22 AWG shielded twisted pair
instrument cable. Within the transmitter enclosure, connec-
tions are made to the terminal strip and the ground connec-
tions. Trim excess wiring to minimize clutter, noise issues and
allow access to Launcher adjustment. See Figure 21. The
directions for wiring the Radar transmitter depend on the
application:
• General Purpose or Non-incendive (Cl I, Div. 2)
• Intrinsically Safe
2.5.1 General Purpose or Non-incendive (Cl I, Div. 2)
A general purpose installation does not have flammable
media present. Areas rated non-incendive (Cl I, Div. 2) have
flammable media present only under abnormal conditions.
No special electrical connections are required. If flammable
media is contained in the vessel, the transmitter must be
installed per Cl I, Div. 1 standards of area classification.
To install General Purpose or Non-incendive wiring:
1. Remove the cover to the wiring compartment of the trans-
mitter. Install the conduit plug in the unused opening.
2. Install a conduit fitting and pull the supply wires.
3. Connect shield to an earth ground at power supply and
leave floating at the transmitter.
4. Connect an earth ground wire to the nearest green ground
screw per local electrical code (not shown in illustration).
5. Connect the positive supply wire to the (+) terminal and the
negative supply wire to the (-) terminal.
6. Seal conduit to prevent ingress of moisture.
7. Replace cover of the transmiter.
2.5.2 Intrinsically Safe
An intrinsically safe (IS) installation potentially has flamma-
ble media present. An approved IS barrier must be installed
in the non-hazardous (safe) area.
To install Intrinsically Safe wiring:
1. Make sure the IS barrier is properly installed in the safe area
(refer to local plant or facility procedures). Complete the
wiring from the barrier to the Radar transmitter.
2. Remove the cover of the transmitter. Install the conduit
plug in the unused opening.
3. Install a conduit fitting and pull the supply wires.
4. Connect shield to an earth ground at power supply and
leave floating at the transmitter.
58-610 Model R82 Radar Transmitter
Ground
(+)
(-)
Figure 21
Wiring the Transmitter
Caution:
The R82 Radar transmitter
operates at voltages of 16–36 VDC (GP)
and 16-28.6 VDC (IS). Higher voltage will
damage the transmitter.
NOTES:
• If sufficient supply voltage is suspect,
use the R82 Low Voltage check
(Section 2.6.6.1, #33: Test 4-20 Loop).
• For ATEX installation guidelines refer to
bulletin BE 58-610.
