Georg Fischer 2291 Specifications

2291 Guided Wave Radar Level Transmitter

Features

• Measuring range up to 6 m (19.6 ft)

• Accuracy: ± 5 mm (0.2 in)

• PP / PFA coated probes available on request

• Rod & cable versions available

• Minimum εr 1.9

• 2-wire version

• Graphic LCD display

• 4 to 20 mA + HART output

• Medium temperature range: -30 °C to +90°C
(-22 °F to +194 °F)

The 2291 Guided Wave Radar level transmitter is
designed for continuous level measuring of conductive
or non-conductive liquids, pulps and solids. The 2291
level gauge operates based on the well-known TDR
(Time Domain Reflectometry) principle. Micropulses are
sent along a probe guide at the speed of light. As soon
as the impulse reaches the surface of the medium, it is
reflected back to the electronic module. Level distance
is directly proportional to the flight time of the impulse.

The reflected signal is dependent on the dielectric
constant of the material; the feasibility of the
measurement is ε
unaffected by the properties of the medium as well
as that of the space above it. Measurement is also
unaffected by the change in the physical properties of
the materials such as temperature, pressure, dielectric
constant.

≥ 1.9. The TDR technology is

r

• Maximum process pressure: 40 bar (580 psi)

• IP67 protection

Applications

• Inventory Tanks

• Day Tanks

• Process Vessels for Mixing & Batching

• Bypass Applications (requires calibration)

• Stilling-wells

• Powders

• Slightly Conductive Foams

• Low Dielectric Constant Liquids

Dimensions

Type 2291 Cable Version

L = 6 m (19.69 ft)

Type 2291 Rod Version

L = 2 m (6.56 ft)

Specifi cations

General

Measured Values Level, Distance; Calculated values: Volume, Mass

Measuring Range Depends on the probe type and dielectric constant (ε

Probe Types Mono cable, mono rod

Accuracy: Linearity Error

1

For liquids: ± 5 mm (0.2 inch), if probe length ± 10 m (32 feet): ± 0.05 % of the probe length

Accuracy: Resolution ± 3 μA

Minimal ε

of the Medium 1.9

r

Power Supply 18 V… 35 V DC

Output: Digital Communication 4-20 mA + HART

Output: Display Graphical LCD display unit

Medium Temperature -30 °C… +90 °C (-22 °F… +194 °F),

Maximum Medium Pressure 4 MPa (40 bar g/ 580 psi g); with plastic lined fl ange: max. 2.5 MPa (25 bar g/ 363 psi g)

Ambient Temperature -20 °C… +60 °C (-4 °F… +140 °F)

Process Connection 1” BSP, 1” NPT Thread

Ingress Protection IP 67

Electrical Connection 2x M20x1.5 cable glands + internal thread for 2x ½”NPT cable protective pipe, cable outer

diameter: Ø 7 … Ø 13 mm (0.3 … 0.5 inch), wire cross section: max. 1.5 mm2 (AWG 15)

Electrical Protection Class III

Housing Material Plastic (PBT)

Sealing FPM, On request: FFKM, EPDM

Mass (head unit) 1.5 kg (3.3 lb)

EX-Approvals ATEX (ia): II 1/2 G Ex ia IIB T6…T5 Ga/Gb

ICEX (ia): EX ia IIB T6…T5 Ga/Gb

) of the measured medium

r

1

Under reference conditions and stabilized temperature

www.gfsignet.com