Reference Manual
00809-0100-4731, Rev FA
April 2003
2-29
APEX
™
and APEX Sentry
™
Radar Gauge
The power terminals are located under a sliding safety cover on the terminal
block. 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 gauge. If the
cover has been removed, the word “DANGER” appears near the terminals.
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.
AC 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 gauge with an ac power supply uses the following fuse size and type
(Rosemount Part No. C53323-1104):
• 2 AG Fuse,
3
/8 A, 250 V, Time Delay
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.
WIRING OPTIONAL
GAUGE DEVICES
Optional devices that can be used with the APEX and APEX Sentry Radar
Gauges include the Model 751 Field Signal Indicator, a 3- or 4-wire RTD
(Resistance Temperature Detector), such as the Series 58C, 68, or 78. The
APEX Radar Gauge can also be used in conjunction with a model 3201 HIU
to form a hybrid system.
Model 751 Field
Signal Indicator
(APEX Radar Gauge and APEX Sentry Radar Gauge)
If the gauge is to be used with a Model 751 Field Signal Indicator, wire the
gauge using one of the options shown in Figure 2-23.
(If necessary, refer to the Model 751 Field Signal Indicator manual,
00809-0100-4378.) 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.
Refer to Safety Messages on page 2-2 for more information.
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