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INDIANA INSTRUTECH
FIG. 01 / 04Guided-wave radar level gauge with coiled cable probe and blue housingProduct photograph
Guided-wave radar level gauge with coiled cable probe and blue housing

02 · Level TransmittersGuided-wave radar

Guided-Wave Radar Level Gauge

Indiana catalogue ID
II-LT-001
Model line
70X series

Contact level measurement for liquids and solid powders in complex process conditions.

Range
Up to 30 m
Accuracy
±10 mm
Output
4–20 mA / HART
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A

Overview

High-frequency microwave pulses travel along a cable or rod probe. Where the probe meets the measured medium the change in dielectric constant reflects part of the pulse back, and the interval between the transmitted and reflected pulse is proportional to the distance to the surface. Six probe configurations cover liquids, powders, high temperature and pressure, corrosive media and low dielectric constants.

Operating principle

  1. 01The probe emits high-frequency pulses that propagate along a cable-type or rod-type probe. When the pulses reach the material surface they are reflected and received by the instrument, which converts the distance signal into a level signal.
  2. 02The distance D to the material surface is proportional to the pulse travel time T: D = C × T / 2, where C is the speed of light. Because the empty-tank distance E is known, the level L is L = E − D.
  3. 03Entering the empty-tank height E (zero point) and full-tank height F (full range) with the application parameters lets the instrument adjust itself; the measurement corresponds to a 4–20 mA output.
  4. 04EchoDiscovery echo processing with the instrument microprocessor identifies the echo generated at the material surface so the gauge can be deployed in complex operating conditions.

In context

Specified forreal process duty.

  • 01Liquid level in storage, reaction and separation tanks
  • 02Powder level in cement silos
  • 03Fly-ash powder measurement
  • 04Acids, alkalis and other corrosive media

B

Variants and model selection

6 documented configurations. Open one to see its specification.

Common to every variant

Specifications common to every variant
Frequency500 MHz – 1.8 GHz
Signal output4–20 mA / HART
On-site displayFour LCD programmable displays
Power sourceTwo-wire (DC 24 V) / four-wire (DC 24 V or AC 220 V)
Process connectionThread / flange (optional)
Explosion-proof certificationExia IIC T6 Ga / Exd ia IIC T6 Gb
Single-cable antennaSingle-cable probeLiquids and solid powders under complex process conditions
Single-cable antenna — Single-cable probe
Applicable mediumLiquids, solid powders
Measurement range30 m
AntennaSingle-cable antenna
Process temperature−40 to 250 °C
Process pressure−0.1 to 4 MPa
Measurement accuracy±10 mm
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Single-pole antennaSingle-rod probeLiquid level; strong penetration of steam and foam
Single-pole antenna — Single-rod probe
Applicable mediumLiquid
Measurement range6 m
AntennaSingle-pole antenna
Process temperature−40 to 250 °C
Process pressure−0.1 to 4 MPa
Measurement accuracy±10 mm
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Dual-cable antennaDual-cable probeLiquids; powder in cement silos; fly-ash powder measurement
Dual-cable antenna — Dual-cable probe
Applicable mediumLiquids, solid powders
Measurement range30 m
AntennaDual-cable antenna
Process temperature−40 to 200 °C
Process pressure−0.1 to 4 MPa
Measurement accuracy±10 mm
Dielectric constantAny dielectric material ≥1.6
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High temperature / high pressureHigh-temperature, high-pressure probeSealed tanks measuring liquids under high pressure
High temperature / high pressure — High-temperature, high-pressure probe
Applicable mediumLiquids under high temperature and high pressure
Measurement range6 m
AntennaSingle-cable or single-pole antenna
Process temperature−40 to 400 °C
Process pressure−0.1 to 40 MPa
Measurement accuracy±10 mm
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PTFE-sealed probeCorrosion-resistant PTFE probeAcids, alkalis and other corrosive media
PTFE-sealed probe — Corrosion-resistant PTFE probe
Applicable mediumLiquids, particularly highly corrosive liquids
Measurement range6 m
AntennaFully tetrafluoroethylene-sealed cable-type or rod-type antenna
Process temperature−40 to 200 °C
Process pressure−0.1 to 4 MPa
Measurement accuracy±10 mm
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Coaxial tubular antennaCoaxial probeLiquids with low dielectric constants — non-ionic water, deoxygenated water
Coaxial tubular antenna — Coaxial probe
Applicable mediumLiquids, particularly those with low dielectric constants
Measurement range6 m
AntennaCoaxial tubular antenna
Process temperature−200 to 250 °C
Process pressure−0.1 to 4 MPa
Measurement accuracy±10 mm
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C

Technical specifications

Transcribed from the product documentation. A value that is not shown is not stated in the source, and is confirmed with the quotation.

Measurement

Measurement
Measurement accuracy±10 mm
Resolution1 mm
Measurement intervalApproximately 1 s, depending on parameter settings
Adjust timeApproximately 1 s, depending on parameter settings
Frequency500 MHz – 1.8 GHz
Minimum dielectric constant≥1.8 for rod probes; ≥1.6 using dual-cable measurement; ≥1.3 inside a guided-wave tube
ViscosityGenerally ≤500 cSt

Output

Output
Output signal4–20 mA / HART
Resolution1.6 µA
Fault signalCurrent output remains unchanged; 20.5 mA; 22 mA; 3.9 mA
Four-wire load resistorMaximum 500 Ω
Integration time0–40 s, adjustable

Supply

Supply
Two-wire, standard type16–26 V DC
Two-wire, intrinsically safe type21.6–26.4 V DC
Maximum current consumption (two-wire)22.5 mA
Four-wire, intrinsically safe + explosion-proof22.8–26.4 V DC, 198–242 V AC
Maximum power consumption (four-wire)1 VA, 1 W
Permitted ripple<100 Hz: Uss < 1 V · 100 Hz–100 kHz: Uss < 10 mV

Materials

Materials
Rod probeStainless steel 316L / PTFE
Cable probeStainless steel 316L / PTFE
Coaxial probeStainless steel 316L / PTFE
SealantViton fluororubber, Kalrez fluororubber
Process connectionStainless steel 316L
ShellAluminium, plastic or stainless steel 316L; cast aluminium with powder layer
Shell windowPolycarbonate
Ground terminalStainless steel 316L

Environment

Environment
Working, storage and transport temperature−40 to 80 °C
Relative humidity<95%
Maximum pressure inside tank40 MPa
Seismic resistanceMechanical vibration 10 m/s², 10–150 Hz
Protection ratingIP66 / IP67

Electrical connection

Electrical connection
Cable inletOne M20 × 1.5 cable inlet for cables 5–9 mm diameter, plus one M20 × 1.5 blind plug
TerminalSpring terminal for wires up to 2.5 mm² cross-section
Cable typeStandard two-core cable, outer diameter 5–9 mm; shielded cable recommended where electromagnetic interference is present
ShieldingBoth ends of the shielded cable must be grounded; the external grounding terminal on the housing must be connected to earth

Explosion protection

Explosion protection
RatingExia IIC T6 — intrinsically safe, die-cast aluminium housing with adhesive-sealed electronics
Associated safety barrierFBS-2 safety barrier, [Exia] IIC, operating voltage 21.6–26.4 V DC, short-circuit current 135 mA, operating current 4–20 mA
Maximum cable length to barrier500 m, shielded cable
Distributed capacitance / inductance≤0.1 µF/km · ≤1 mH/km
Maximum measuring distance and process temperature by model code
Model codeMaximum measuring distance (cable / rod)Process temperature at antenna section
31130 m / 6 m−40 to 250 °C
31220 m / 6 m−40 to 200 °C
31330 m / 6 m−40 to 150 °C
3146 m−40 to 250 °C
31515 m / 6 m−200 to 400 °C
  • The datasheet lists maximum distance and process temperature against model codes 311–315. Confirm the model code for your probe configuration with the technical team before ordering.

Source · INDIANA INSTRUTECH · Guided-Wave Radar Level Gauge — operating instruction

D

Installation

Guidance from the product’s operating documentation.

  1. 01Keep the cable or rod clear of internal obstacles across the whole measuring range — ladders, limit switches, heating equipment and supports — and keep it out of the feeding material flow.
  2. 02Install away from discharge and inlet ports. For a hopper, install at 1/4 or 1/6 of the hopper diameter. Minimum distance from the wall is 1/10 of the measuring range.
  3. 03Minimum distance from probe to tank wall ≥300 mm. Bottom of the probe at least 30 mm from the tank bottom. Minimum distance to any obstacle inside the tank ≥200 mm.
  4. 04Threaded joints: thread length not exceeding 15 mm. For 2″–6″ mounting pipes keep pipe height ≤100 mm. For DN200 or DN250 short pipes a special flange with a horn interface must be selected, otherwise echoes form on the pipe inner wall.
  5. 05On plastic containers the process connection surface must be metal: use a metal flange, or provide a metal plate where a threaded connection is used.
  6. 06The rod probe has a maximum length of 6 m. Beyond that, select a 4 mm cable probe. In a guided-wave tube with a cable probe the tube diameter must be ≥6 inches (DN150).

E

Applications and industries

Documented in the product literature, not inferred.

Applications

  • Liquid level in storage, reaction and separation tanks
  • Powder level in cement silos
  • Fly-ash powder measurement
  • Acids, alkalis and other corrosive media
  • Non-ionic and deoxygenated water with low dielectric constants
  • Sealed tanks holding liquids under high pressure

Industries

  • Power generation
  • Cement
  • Chemical and petrochemical
  • Water and wastewater
  • Food processing

To specify or quote this, the team needs

  • Explosion-protection licence required
  • Tank type, material, height and diameter
  • Tank roof and bottom form
  • Installation method — top, side, bypass pipe or waveguide pipe
  • Tank-top nozzle height and tube diameter
  • Medium name and state — liquid, solid or mixed
  • Medium temperature and dielectric constant
  • Process connection — thread G1½″ / 1½″ NPT, or flange DN / ANSI
  • Power — 24 V DC two-wire, 24 V DC four-wire or 220 V AC four-wire
  • Output — 4–20 mA or HART
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F

Downloads

Branded PDFs generated from this page's own data — nothing in them that isn't on the site.

Technical sheetOverview, key values, gallery and applications — the selling document for Guided-Wave Radar Level Gauge.PDF · 0.2 MBFull specificationEvery stated value, variants, open points and ordering information.PDF · 0.3 MB

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