Reference Manual
00809-0100-4731, Rev FA
April 2003
2-25
APEX
™
and APEX Sentry
™
Radar Gauge
Figure 2-19. Main Power Supply
Voltage vs. Wire Length
Required
Power vs. Distance
Requirements
Hazardous Locations APEX and APEX Sentry feature an explosion-proof housing. Each gauge is
clearly marked with a label indicating the certification it carries. See
Appendix B: Product Certificates for specific approval information.
DC Main Power Supply
with 4–20 mA Loop
Power Supply
Wire the APEX and APEX Sentry Radar Gauges as shown in Figure 2-20,
using an 18–36 V dc main power supply. Loop power is required for the 4–20
mA/HART output. Use a 10.5–55.0 V dc secondary power supply for the 4–20
mA/HART loop output. Refer to Power Requirements on page 2-24 to
determine the power supply voltage required in the control room. 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.
Table 2-6. APEX and APEX Sentry Radar Gauge Power Requirements
Power Supply dc ac
Main Power Supply 18–36 V dc 90–250 V ac 50/60 Hz
Loop Power Supply for 4–20 mA 10.5–55 V dc 10.5–55 V dc
Power Supply Voltage in Volts
Approximate Wire Distance in Feet (Meters)
18 AWG
16 AWG
12 AWG
45.0
40.0
35.0
30.0
25.0
20.0
15.0
0
(0)
100
(30)
200
(60)
300
(91)
400
(121)
500
(153)
600
(182)
700
(213)
800
(243)
900
(274)
1000
(304)
LEVEL_APEX06A
Refer to Safety Messages on page 2-2 for more information.
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