Saab LoopRadar Manuel utilisateur
User´s Guide
Preliminary edition
(i)
User´s Guide
First edition
Edition 1. Ref. No: 307010E
Copyright © April 2000
SaabMarineElectronicsAB
(ii)
Edition 1. Ref. No: 307010E
Copyright © April 2000
Saab Marine Electronics AB
Thecontents,descriptionsandspecificationswithinthismanualissubjectto
changewithoutnotice.SaabMarineElectronicsABacceptsnoresponsibilityfor
anyerrorsthatmayappearinthismanual.
Trademarks
HART is a registeredtrademarkofHARTCommunicationFoundation.
LoopRadarisatrademark ofSaab MarineElectronicsAB.
TankRadarisaregisteredtrademarkof SaabMarineElectronicsAB.
Spare Parts
Anysubstitutionofnon-recognizedsparepartsmayjeopardizesafety.Repair,e.g.
substitutionof components etc., may also jeopardize safetyandisunderno cir-
cumstancesallowed.
SaabTankControlwillnottake any responsibilityforfaults,accidents, etc. caused
bynon-recognizedsparepartsoranyrepairwhichisnotmadeby
SaabTankControl.
Safety
Thismanualappliestoequipmentcoveredbycertificatenumber
SIRA 00ATEX2052X.
Theequipmentmaybeusedwithflammablegasesandvapourswithapparatus
groupsIIA,IIBand IIC and withtemperatureclassesT1toT4inclusive.
Theequipment isonlycertified forusein ambienttemperaturesin therange
-40 °C to +70 °C and should not be used outside this range.
TheSaabLoopRadartransmittermustbeinstalledbysuitablytrainedpersonnel
accordingtotheinstructionsinthismanualandinaccordancewiththeapplicable
codeofpractice.Thecertificatenumberhas an’X’suffixwhichindicatesthat
specialconditionsforcablecapacitanceapply.Forspecificationofcablecapacitance
seethecertificate.
Repairofthisequipmentshallbecarriedoutinaccordancewiththeapplicablecode
ofpractice.
( iii )
Edition 1. Ref. No: 307010E
The various warning messages shown in the Users Guide are indicated as follows:
Indicates that incorrect usage may result in
personal injury or malfunctioning instruments.
!
Caution
Indicates a potentially hazardous situation
which could result, if not avoided, in death
or serious injury.
!
Warning
!
Warning
Don´t open
lower nut
if tank is
pressurised
or contains
hazardous
product.
(iv)
Edition 1. Ref. No: 307010E
Contents
About this manual....................................................... vi
1 Product Description ...................................... 1-1
1.1 Features ................................................................................ 1-1
1.2 Measurement Principle.......................................................... 1-2
2 Mechanical Installation ................................. 2-1
2.1 Requirements ........................................................................ 2-1
2.2 Dimensions ........................................................................... 2-3
2.3 Tools ...................................................................................... 2-4
2.4 Mounting the Cone Antenna .................................................. 2-5
2.5 Installation Hints..................................................................... 2-7
3 Electrical Installation..................................... 3-1
3.1 Connecting the LoopRadar ................................................... 3-1
3.2 Cables ................................................................................... 3-3
3.3 Load ...................................................................................... 3-3
3.4 Power supply ......................................................................... 3-3
3.5 Grounding .............................................................................. 3-3
4 Transmitter Setup .......................................... 4-1
4.1 Configuration ......................................................................... 4-2
4.1.1 General Settings ........................................................ 4-2
4.1.2 Basic Tank Geometry ................................................ 4-2
4.1.3 Advanced Tank Geometry ........................................ 4-3
4.2 Analog Output ........................................................................ 4-4
(v)
Edition 1. Ref. No: 307010E
4.3 Volume Calculation ................................................................ 4-5
4.4 Disturbance Echo Handling. .................................................. 4-7
4.4.1 Noise Table ................................................................ 4-7
5 Using the Display Panel ................................ 5-1
5.1 Display Panel......................................................................... 5-1
5.1.1 Display ....................................................................... 5-1
5.1.2 Keys ........................................................................... 5-2
5.2 Basic Key Parameter List ...................................................... 5-3
5.3 Navigating the Display Panel Menus ..................................... 5-5
5.4 Configuration ......................................................................... 5-6
5.5 Volume Calculation ................................................................ 5-8
5.6 Setting up the Analog Output............................................... 5-10
5.7 Disturbance Echo Handling ................................................. 5-11
5.7.1 Setting up a Noise Threshold Table ....................... 5-11
6 Technical Information ................................... 6-1
7 Troubleshooting ............................................ 7-1
Index ............................................................................... I
Appendix 1: Key Parameters ................................. A1-1
(vi)
Edition 1. Ref. No: 307010E
About this manual
The main purpose of Users Guide is to act as guide to installing and operating
the Saab LoopRadar. It is not intended to cover service tasks such as changing
circuit boards or internal software.
Chapter 1 reviews some basic concepts of radar based level gauging.
Chapter 2 describes how to assemble a gauge and how to mount it on a tank.
Chapter 3 describes the electrical installation.
Chapter 4 describes the parameters that need to be configured, how to handle
disturbing echoes and various options for volume calculation.
Chapter 5 describes how to use the Display Panel to configure the Saab Loopradar.
Chapter 6 provides technical information.
Chapter 7 lists the various error codes that may appear.
1-1
Edition 1. Ref. No: 307010E
Product Description
1 Product Description
The LoopRadar transmitter uses a non-contact level gauging measurement tech-
nique based on the principle of pulsed microwaves. It is loop-powered and easy
to install and can be used for many types of level measurement applications. The
LoopRadar is safe for humans and has no environmental impact. Propagation of
microwaves is virtually unaffected by temperature, pressure or gas characteristics
in the tank resulting in excellent measurement stability.
1.1 Features
Loop-Power
The LoopRadar only needs one two-wire line for both power supply and output
signal. The LoopRadar is powered by a PLC or a power supply unit.
Communication
The LoopRadar has a 4-20 mA current output and a HART protocol interface for
digital data transmission. The transmitter can be configured by using a HART
communicator (Device Descriptor in preparation), a PC-based setup software or
the Display Panel.
LoopRadar with
analog output signal
4-20 mA and HART
interface.
Volume calculation function
A calculation function transforms the measured level into the corresponding prod-
uct volume. The volume calculation is based on one of the standard tank shapes
Sphere, Vertical cylinder or Horizontal cylinder. The LoopRadar also offers the
possibility to calculate the product volume for an arbitrary tank shape by specifying
a Tank Capacity Table consisting of up to 20 levels and corresponding volumes.
1-2
Edition 1. Ref. No: 307010E
Product Description
1.2 Measurement Principle
Ullage
Level
1 ns
1 µs
Pulse sequence
Distance=c* 2
t
A LoopRadar gauge is installed at the tank top. It emits short microwave pulses
towards the product surface in the tank. The emitted microwaves hit the product
surface and are reflected back to the antenna for subsequent processing by the
transmitter electronics. The time from transmission to reception (t) is detected by
a micro-processor and is converted to the distance between the transmitter and
the product surface. The measured distance is often referred to as the Ullage.
The product level is calculated by using the following relation between tank height
and Ullage:
Level=Tank Height - Ullage.
Tank Height
2-1
Edition 1. Ref. No: 307010E
Mechanical Installation
2 Mechanical Installation
2.1 Requirements
Mounting position
Do not mount the transmitter at the center of the tank or close to the tank wall.
This may reduce the measuring range or the accuracy and makes the transmitter
more sensitive to disturbing echoes. We recommend that the transmitter is
mounted so that the antenna tip is located at least 0.5 m from the tank wall.
Socket requirements
The antenna tip should be located outside the
nozzle (10 mm or more ).
If the antenna is located inside the nozzle
the antenna tip may cause disturbing echoes
which will negatively affect measurement
performance.
Free space requirements
The transmitter should be mounted so that no
obstacles are present in the radar beam.
Obstacles in the radar beam may reduce the
measuring range.
Distance
Diameter of radiated area (m).
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Half Power Beam Width.
Antenna
tip
10 mm
or more
500 mm or more
Half Power Band Width
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1
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