Georg Fischer 2291 Operating Manual
GF Piping Systems
Instruction Manual
2291 Guided Radar Level Transmitter
2
Original instruction manual
Follow the instruction manual
The instruction manual is part of the product and is an important element of the safety
concept.
Read and follow the instruction manual.
Always keep the instruction manual available of the product.
Pass on the instruction manual to all subsequent users of the product.
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Contents
Original instruction manual ............................................................................................................ 3
Contents ........................................................................................................................................... 4
1 Intended use .......................................................................................................................... 5
2 About this document ............................................................................................................. 5
2.1 Warnings ................................................................................................................................ 5
3 Safety and responsibility ....................................................................................................... 5
4 Transport and storage ........................................................................................................... 6
5 Design and function ............................................................................................................... 6
5.1 Function ................................................................................................................................. 6
5.2 Principle of operation ............................................................................................................ 6
6 Technical data ........................................................................................................................ 7
6.1 Dimensions ............................................................................................................................ 8
7 Installation ............................................................................................................................. 9
7.1 Handling and Storage ............................................................................................................ 9
7.2 Mounting on the tank ...........................................................................................................10
7.2.1 Installation instructions: General notes ..............................................................................10
7.2.2 Specific installation instructions: Gauge – solid applications ...........................................13
7.3 Wiring ....................................................................................................................................14
7.4 Power on and start-up .........................................................................................................17
8 Programming type 2291 .......................................................................................................18
8.1 The display unit .....................................................................................................................18
8.1.1 Behavior in manuals programming mode ..........................................................................18
8.1.2 Manual programming...........................................................................................................19
8.2 Characteristics .....................................................................................................................20
8.2.1 Gauge operating logic when the reflection is lost ..............................................................21
8.2.2 Gain and voltage amplitude..................................................................................................22
8.2.3 Typical signal trends ............................................................................................................24
8.2.4 Automatic adjustment ..........................................................................................................25
8.2.5 Level measurement when more than one phase or layer in the tank ..............................25
9 Troubleshooting ....................................................................................................................27
10 Repair and Maintenance ......................................................................................................30
11 Accessories ...........................................................................................................................30
12 Set-up parameters ...............................................................................................................30
13 Disposal .................................................................................................................................30
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Instruction manual Intended use
Danger of personal injury!
Failure to comply leads to a risk of personal injury!
Risk of damage to property!
Failure to comply leads to a risk of damage to property (loss of time, loss of data, device
fault etc.)!
1 Intended use
The Level Transmitter uses the Time Domain Reflectometry (TDR) measuring principle and
two-wire technology for level measurement. It is designed for measuring the distance, level
and volume of liquids, pastes, slurries and powder products. The device is applicable in tank,
silo, rigid pipe, reaction vessel and level reference vessel.
The device is HART capable; it can be programmed using the GF Signet configuration
software Eview2 which is available on www.gfps.com/level
Please note: All display units also can be programmed directly without any additional
hardware.
2 About this document
2.1 Warnings
This instruction manual contains warning notices that alert you to the possibility of injuries or
damage to property. Always read and pay attention to these warnings!
3 Safety and responsibility
Only use the product for the intended purpose, see Intended Use.
Do not use any damaged or faulty product. Sort out any damaged product immediately.
Have the product and accessories installed only by persons who have the required
training, knowledge or experience.
Regularly train personnel on all questions regarding the locally regulations applying to
occupational safety and environmental protection, especially for pressurize tanks.
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Transport and storage Instruction manual
4 Transport and storage
Protect the product against external forces during transport (impacts, knocks, vibrations
etc.).
Transport and / or store the product unopened in its original packaging.
Protect the product from dust, dirt, moisture as well as heat and ultraviolet radiation.
Ensure that the product is not damaged either by mechanical or thermal influences.
Before assembling, check the product for damage during transport.
5 Design and function
5.1 Function
5.2 Principle of operation
The Type 2291 guided microwave level transmitter uses the TDR (Time Domain Reflectometry)
principle. The instrument sends low power ns wide pulses along an electrically conductive
rod, cable or coaxial probe with a known propagation speed (the speed of light). As the pulse
reaches the surface of the medium or phase of two liquids (altered dielectric constant r), a
part of it is reflected back to the electronic module. The efficiency of the reflected signal
depends on the dielectric constant r difference of the mediums or layers. (From the plain
surface of air-water phase the reflected signal's strength will be approx. 80% of the emitted
signal). The reflected pulse is detected as an electrical voltage signal and processed by the
electronics. Level distance is directly proportional to the flight time of the pulse. The
measured level data is converted into 4-20 mA current and HART signals and is displayed on
the LCD display. From the level data further derived measuring values can be calculated such
as volume and mass. The TDR technology is unaffected by the other properties of the medium
as well as that of the space above it.
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Instruction manual Technical data
Data
Kv value
Input data
Measured values
Between the reference point of the unit and reflection
plane (material surface), distance, level, and volume
Measuring range
Single cable 6 m (19,7 ft), single rod 2 m (6.6 ft)
Housing
Plastic BPT
Medium temperature
–30 °C ... +90 °C (–22 °F ... +194 °F
Minimal dielectric constant (r)
1.9
Medium pressure
- 0.1 … 1.6 MPa (- 1… 16 bar) max. allowed pressure
at 20 °C (68 °F)
Ambient temperature
With display: –20 °C … +60 °C (-4 °F… +140 °F)
Sealing
FPM
Ingress protection
IP 65 (NEMA 4 – 4X)
Power supply
18 … 35 V DC , nominal 24 V DC, Ex version 18 … 28V
Output
data
Output signals
Analogue: 4 … 20 mA, (3.9 … 20.5 mA) passive output,
error 22 mA
BUS: serial line, HART interface, terminal resistor max.
750 ohm
Display: LCD matrix
Accuracy
Liquids: 5mm. For probe
length L ≤10m 0.05% of the
range
Under ideal reflection
and stabilized
temperature conditions.
Resolution
3A
Electrical connection
2 x M20x1.5 metal cable glands Cable diameter: 7 … 13
mm (Ex), or M20x1.5 plastic cable glands, Cable
diameter: 6 … 12 mm
wire cross-section: 0.5 … 1.5 mm2 (shielded cable is
advised) + 2 x NPT ½” for cable gland
Electrical protection
Class III.
Mass (housing)
1.5 kg
6 Technical data
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Technical data Instruction manual
Type
Ex marking
II 1 D iaD A20/21 IP 65 T100°C
Intrinsically safe data
Ci ≤ 10 nF, Li ≤ ≤ 30 V, Ii ≤ 150 mA, Pi ≤
1 W For Ex transmitter only EEx ia power supply
should be used
Ex power supply
Uo < 30 V, Io < 150 mA, Po < 1 W, Supply range 18
V … 30 V
Nr.
Description
1
Housing
2
Cable gland
3
Process connection
4
Mono cable probe
5
Weight
6
Mono rod probe
Explosion Protection, Ex markings, Ex limit data
6.1 Dimensions
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Instruction manual Installation
The device will weigh between approximately 1.5 kg or 3 lb, 12 kg or 25 lb.
Carry using both hands to lift the device carefully by the converter housing. If necessary, use
lifting gear. No attempt should be made to lift the instrument by its probe. Caution: The
probe is a critical gauge component. Do not damage - Handle with care!
Avoiding blows - avoid hard blows, jolts, impacts, etc. Caution: fragile electronics
Avoid bending (single rod and coaxial
probes) - Support the probe to avoid
bending.
400mm
minimum
+80°C
-40°C
Avoid cable kinks and fraying
Do not coil the cable less than 400 mm or 16 “
in diameter. Cable kinks or fraying will cause
measurement errors.
Storage temperature
7 Installation
7.1 Handling and Storage
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Installation Instruction manual
Threaded process connections
The simplest and most economical way is to
mount type 2291 directly on the tank with the
1” BSP or 1” NPT threaded connection.
Nozzle height
Do not fit a nozzle longer than its diameter,
especially for single probes and powder
applications.
h ≤ Ød
h = nozzle height and
d = nozzle diameter
Nozzles penetrating into tank
Caution: Do not use nozzles that penetrate
into the tank. This will disturb the emitted
pulse.
7.2 Mounting on the tank
7.2.1 Installation instructions: General notes
Prior the installation some consideration is to be made regarding tank fittings and tank shape.
Nozzle position in relation to the tank walls and other objects inside the tanks
(Warning: this free area will depend on the probe type selected: refer to later on in this
section) type of tank roof, i.e. floating, concrete, integral, etc; and base, i.e. conical, etc.
Whenever working on an installation, remember to: Disconnect the power supply before
starting work. However, the gauge may be installed when the tank contains product.
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