Reference Manual
00809-0100-4731, Rev FA
April 2003
APEX
™
and APEX Sentry
™
Radar Gauge
A-4
EQUIPMENT
DESCRIPTION
APEX and APEX Sentry
• Microprocessor-based radar level gauge with analog output,
superimposed with a digital HART signal
• Small, lightweight, noncontacting design that allows for installation on the
top of most pressurized or nonpressurized tanks
• Use Frequency Modulated Continuous Wave (FMCW) radar signaling
technology at 24 GHz frequency
APEX Only
Measures the level of liquids, slurries, or sludges that may have a variety of
severe process conditions
APEX Sentry only
Measures the level of liquids, slurries, or sludges under less severe conditions
PERFORMANCE
SPECIFICATIONS
APEX and APEX Sentry
• Gauge meets the following minimum performance criteria, which are
stated at Reference Conditions: free-space reflection from flat metal
surface, ambient temperature 77 °F (25 °C), and atmospheric pressure
conditions. The use of stilling wells may impact the accuracy.
APEX Only
• Accuracy:
1
/8 in. (3mm) for distances from 1.6 to 32.8 ft
(0,5 to 10 m) or ±0.03% of measured distance from 32.8 to
98.4ft (10to30m)
• Measuring range: within accuracy specifications 1.6 to 98.4 ft
(0,5 to 30 m) measured from the flange face
• Repeatability: ±0.04 in. (1 mm)
• Resolution: ±0.02 in. (0,4 mm)
• Update Time: once every second
APEX Sentry Only
• Accuracy: ±0.4 in. (10 mm) for distances from 1.6 to 32.8 ft
(0,5 to 10 m) or ±0.1% of measured distance from 32.8 to
65.6 ft (10 to 20 m)
• Measuring range: within accuracy specifications 1.6 to 65.6 ft
(0,5 to 20 m) measured from the flange face
• Repeatability: ±0.1 in. (3 mm)
• Resolution: 0.04 in. (1 mm)
• Update Time: once every 3 seconds
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