Reference Manual
00809-0100-4731, Rev FA
April 2003
APEX
™
and APEX Sentry
™
Radar Gauge
2-28
NOTE
For all radar gauges with output code 2 (intrinsically safe output), the negative
4–20 mA (HART) terminal is grounded to the electronics housing. Do not use
another ground in the loop. In installations where the intrinsically safe
output (output code 2) will be used, an isolated barrier is required.
NOTE
The APEX will operate on 18–36 V dc at its power terminals. Refer to Power
Requirements on page 2-24 to determine the power supply voltage required
in the control room.
NOTE
To ensure long life for your radar gauge, and to comply with hazardous
location installation requirements, tighten covers on both sides of the
electronics housing to achieve metal-to-metal contact.
AC Main Power Supply
with 4–20 mA Loop
Power Supply
Wire the gauge as shown in Figure 2-22, using a 90–250 V ac, 50/60 Hz
power supply. Loop power is required for the 4–20 mA/HART output. Use an
additional 10.5–55.0 V dc secondary power supply for the 4–20 mA/HART
loop output. Make sure the main power to the gauge is off and the lines to any
other external power source are disconnected or not powered while wiring the
gauge.
Figure 2-22. AC Power Supply
Connections with Separate 4–20
mA Loop Power
Refer to Safety Messages on page 2-2 for more information.
Ground Terminal
APEX Radar
Gauge
90-250 V ac,
50/60 Hz
Main Power
L1
(fused)
Indicator/DCS
L2
Protective
Earth
(Ground)
Conductor
10.5–55.0 V dc
Power Supply
APEX Radar Gauge with Output Code 2
or APEX Sentry Radar Gauge
90-250 V ac,
50/60 Hz
Main Power
Supply
10.5–55.0 V dc
Power Supply
Indicator/DCS
L1
(fused)
L2
Protective
Earth
(Ground)
Conductor
LEVEL-0034, 0032AA.EPS
To Next Page
Loading...
Need help?
General
