9

SYSTEM DESIGN

Measurement Principle

Pulse Burst Radar @ 26 GHz

INPUT

Measured Variable

Level, determined by the time-of-flight of a radar pulse from the

transmitter to the product surface and back

Zero and Span

15" to 40 feet (0.4 to 12.2 m) as measured from threads

OUTPUT

Type

Analog: 4–20 mA with optional HART digital signal

Range

Analog: 3.8 to 20.5 mA useable (Namur NE43)

Digital: 0 to 999" (0 to 9999 cm)

Resolution

Analog: 0.01 mA

Digital: 0.1"

Loop Resistance

GP/IS/XP 400

Ω @ 24 VDC/20 mA; 350 Ω @ 24 VDC/22 mA

Diagnostic Alarm

Adjustable 3.6 mA, 22 mA, HOLD

Damping

Adjustable 0–45

Output at Antenna

< 0.1 mW (avg), < 2 mW (max)

USER INTERFACE

Keypad

Four-button, menu-driven data entry and system security

Indication

Two-line

× 16-character display

Digital Communication

HART Version 5 compatible

General Purpose/Intrinsically Safe 16 to 36 VDC

HOUSING

Material

Lexan base and cover or

Cast aluminum A356T6 (< 0.2% copper)

Cable Entry

3

Ingress Protection

Lexan Housing: NEMA 6P (IP67/68

Aluminum Housing: NEMA 4X/6P (IP67/68)

ANTENNA

Wetted Surfaces

Polypropylene or Tefzel

Maximum Process Temperature -40 to +200° F (-40 to +93° C) @ atmos

Maximum Process Pressure

Vacuum to 200 psig @ +70° F (-14.5 to 13.8 bar)

Minimum Dielectric

1.7 (application dependent)

Process Connections

2" NPT/BSP sanitary flanges

ENVIRONMENT

Operating Temperature Range

-40° to +175° F (-40° to +80° C)

LCD Operating Temp. Range

-5° to +160° F (-20° to +70° C)

Storage Temperature

-50° to +175° F (-46° to +80° C)

Humidity

0-99%, non-condensing

Electromagnetic

Meets CE requirements EN 50081-2, EN 50082-2

PERFORMANCE

Reference Conditions

Reflection from ideal reflector at +70° F (+20° C)

Linearity

±0.2" (5 mm) or 0.05% of tank height (whichever is greater)

Measured Error

±0.2" (5 mm) or 0.05% of tank height (whichever is greater)

Resolution

0.1" (2.5 mm)

Repeatability

±0.1" (2.5 mm) or 0.025% of tank height

Warm-up Time

30 seconds

Ambient Temperature Effect

0.05% per 10° C

Process Dielectric Effect

< 0.3 inch within selected range

Maximum Rate of Change

180 inches (450 cm) / minute

R82

MODEL

User Interface

of the Model R82