Reference Manual
00809-0100-4731, Rev FA
April 2003
APEX
™
and APEX Sentry
™
Radar Gauge
2-26
Figure 2-20. DC Power Supply
Connections with 4-wire
Installation and Separate 4–20
mA Power Supply
NOTE
DC gauges can be configured as a 3 wire gauge if a jumper is used between
the power supply and the loop wiring.
The power terminals are located under a sliding safety cover on the terminal
blocks. This sliding cover exposes only one terminal at a time to guard against
electrical shock. The safety cover must be left on while wiring the radar
gauge. If the cover has been removed, the word “DANGER” appears near the
terminals.
NOTE
When wiring multiple devices, run separate wire pairs to each radar gauge—
do not “daisy chain” or use common return wiring configurations. In other
words, while it is acceptable to multidrop gauges in the 4–20 mA loop, it is not
acceptable to multidrop the power supply loops.
DC Main Power Supply Fuse Size and Type
Be sure to use the proper fuse size and type. Failure to use the appropriate
fuse could result in improper operation or damage to the gauge.
The radar gauge with a dc power supply uses the following
fuse size and type (Rosemount Part No. C53323-0107):
• 2 AG Fuse, 1A, 250 V, Fast Action
LEVEL-0032, 3700 -1501a01a
Indicator/DCS
10.5–55.0 V dc
Power Supply
(fused)
APEX Radar
Gauge
APEX Radar Gauge with Output Code 2 or
APEX Sentry Radar Gauge
18-36 V dc
Main Power
Supply
10.5-55 V dc
Supply
18-36 V
dc
Main
Indicator/DCS
See note regarding grounding on page 2-23.
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