Saab Marine Electronics TankRadar L/2 User manual

INSTALLATION
MANUAL
W11W12
FOR
INTRINSICALLY
SAFECIRCUITS
ONLY
"i"
W11W12
FOR
INTRINSICALLY
SAFECIRCUITS
ONLY
"i"
W11W12
FOR
INTRINSICALLY
SAFECIRCUITS
ONLY
"i"
Parabolic
Antenna
Gauge
Still Pipe
Gauge
Horn
Antenna
Gauge
LPG/LNG
Gauge
Copyright © June 1995
Saab Marine Electronics AB
USVersion

2 Saab TankRadar L/2
US Version. Seventh edition, June 1995
Installation Manual
Copyright © June 1994
Saab Marine Electronics AB
The contents, descriptions and specifications within this manual is
subject to change without notice. Saab Marine Electronics AB
accepts no responsibility for any errors that may appear in this
manual.
The manuals available forTankRadar L/2 are
- Technical Description
- Installation Manual
- Operator’s Manual
- Operator’s Manual for OPI/2
- COS Operator’s Manual
- Service Manual
The Technical Description contains all technical data on the vari-
ous parts of the TankRadar L/2 System.
The Installation Manual is used for planning and performing the
installation of the system.
Once the parts of the system have been installed, then use either
the Operator’s Interface (OPI) or the Configuration Software
(COS) to configure the system. See the OPI Operator’s Manual or
the COS Operator’s Manual for detailed explanation.
The OPI Operator’s Manual describes how to operate the
TankRadar L/2 System using the Operator’s Interface software on
a personal computer.
The Operator’s Manual for OPI/2 describes Operator’s Interface
with the optional inventory functions included, designated OPI/2.
The COS Operator’s Manual describes how to use the Configura-
tion Software (COS).

Saab TankRadar L/2 3
US Version. Seventh edition, June 1995
Installation Manual
Contents
The manuals available forTankRadar L/2 are ............................................... 2
Denominations and abbreviations used in this manual: .............................. 6
1 Introduction to theTankRadar L/2 System .................................... 7
2 Safety ............................................................................................... 10
2.1 Intrinsic Safety .................................................................................. 10
2.2 Explosion Proof................................................................................. 11
2.3 Specific FCC Requirements (US market only) ............................. 11
3 Description of the RadarTank Gauges ......................................... 12
3.1 Transmitter Head............................................................................. 12
3.1.1 Electronic Unit ............................................................................ 13
3.1.2 Cable Outputs ............................................................................. 13
3.1.3 Power Supply to the Radar Tank Gauge ................................. 14
3.1.4 Barrier Unit Card, BU (Option) ................................................ 14
3.1.5 Current Loop Card, CLC (Option)........................................... 15
3.1.6 Metrological Seal ........................................................................ 15
3.1.7 Installation Data for the Transmitter Head............................. 15
3.2 Description of the Horn Antenna Gauge, RTG 2920.................... 16
3.2.1 Installation Data for RTG 2920 ................................................. 16
3.3 Description of the Parabolic Antenna Gauge, RTG 2930............. 17
3.3.1 Installation Data for RTG 2930 ................................................. 17
3.4 Description of the Still Pipe Gauge, RTG 2940 ............................. 18
3.4.1 Installation Data for RTG 2940 ................................................. 18
3.5 Description of the LPG/LNG Gauge, RTG 2960 ........................... 19
3.5.1 Installation Data for RTG 2960 ................................................. 19
4 Description of the Data Acquisition Units ................................... 20
4.1 Connection of the Sensors .............................................................. 20
4.2 Selecting theTemperature Range .................................................. 21
4.3 Local Readout Display ..................................................................... 21
4.4 Write Enable/Inhibit Switch............................................................ 21
4.5 Common Installation Data for Both DAUs ................................... 22
4.6 Description of the Slave Data Acquisition Unit, DAU 2100......... 22
4.6.1 Installation Data for DAU 2100 ................................................ 22
4.7 Description of the Independent Data Acquisition Unit................ 23
4.7.1 Power Supply.............................................................................. 23
4.7.2 Relays (Optional) ........................................................................ 23
4.7.3 Installation Data for DAU 2130 ................................................ 24
5 Description of the Field Bus Modem, FBM 2170 ......................... 24
5.1 Installation Data for FBM 2170 ................................................. 24
6 Description of the Field Communication Unit, FCU 2160......... 25
6.1 Communication Ports ..................................................................... 25
6.2 FCU Enclosure.................................................................................. 26
6.3 FCU Power Supply ........................................................................... 26
6.4 Write Inhibit/Enable Switch............................................................ 26
6.5 Installation Data for FCU 2160....................................................... 27

4 Saab TankRadar L/2
US Version. Seventh edition, June 1995
Installation Manual
7 Description of the Junction Boxes................................................. 28
7.1 Junction Box JB 8 for Connection of RTG to Slave DAU ............. 28
7.2 Junction Box JB 12 for Connection of RTG (with CLC) to
Slave DAU ......................................................................................... 28
7.3 Junction Box JB 16 for Connection to RTG and Independent DAU
29
7.4 Junction Box JB 36 for Connection ofTemperature Sensors ....... 29
8 Connection to a Plant Host Computer (Plant DCS) .................. 29
8.1 Connect to the FCU for Quick Updates........................................ 30
8.2 Connect to OPI/2 for Inventory Data ............................................ 30
9 Installation Schedule ...................................................................... 30
10 Requirements on the installation of the RadarTank Gauges ..... 31
10.1 Requirements for the Horn Antenna Gauge, RTG 2920 .............. 32
10.1.1 Free Space Requirement ............................................................ 32
10.1.2 Socket Requirement.................................................................... 33
10.2 Requirements for Parabolic Antenna Gauge, RTG 2930.............. 34
10.2.1 Inclination of the Parabolic Antenna Gauge........................... 34
10.2.2 Free Space Requirement ............................................................ 35
10.2.3 Flange Requirements ................................................................. 36
10.2.4 New Tanks ................................................................................... 36
10.2.5 Socket Requirements.................................................................. 37
10.3 Requirements for the Still Pipe Gauge, RTG 2940 ....................... 38
10.3.1 Still Pipe Requirements.............................................................. 38
10.3.2 Flange Requirements ................................................................. 38
10.3.3 New Tanks ................................................................................... 39
10.3.3 Service Space ............................................................................... 39
10.4 Requirements for the LPG/LNG Gauge, RTG 2960 ..................... 40
10.4.1 Temperature and Pressure Measurement ............................... 40
10.4.2 Still Pipe ....................................................................................... 40
10.4.3 References in Still Pipe............................................................... 40
10.4.4 System with Reference Pin and Reflector Plug ...................... 41
10.4.5 System with Reference Pins Only ............................................ 41
10.4.6 Extension Pipe for Minimum Distance ................................... 41
11 Mechanical Installation of the RadarTank Gauges ...................... 42
11.1 Installation of Horn Antenna Gauge, RTG 2920 ........................... 42
11.2 Installation of the Parabolic Antenna Gauge, RTG 2930 ............. 44
11.3 Installation of the Still Pipe Gauge, RTG 2940.............................. 47
11.4 Installation of the LPG/LNG Gauge, RTG 2960 ............................ 50
12 Electrical Installation...................................................................... 53
12.1 Cabling for Power Supply ................................................................ 53
12.2 Cabling forTRL/2 Bus ...................................................................... 54
12.3 Grounding ......................................................................................... 54
12.4 Electrical Installation of the RadarTank Gauge, RTG .................. 54
12.4.1 The Non-Intrinsically Safe Connection (W11)........................ 54
12.4.2 The Intrinsically Safe Connection (W12)................................. 54

Saab TankRadar L/2 5
US Version. Seventh edition, June 1995
Installation Manual
12.5 Electrical Installation of the Data Acquisition Unit, DAU ........... 55
12.5.1 Electrical Installation of the Slave DAU, DAU 2100.............. 55
12.5.2 Electrical Installation of the Independent DAU, 2130........... 55
12.6 Electrical Installation of the Field Bus Modem, FBM 2170 .......... 56
12.7 Electrical Installation of the Field Communication Unit,
FCU 2160 .......................................................................................... 56
13 List of Drawings .............................................................................. 57
13.1 Mechanical Installation .................................................................... 57
13.2 Electrical Installation ....................................................................... 57
14 Description of the Required System Information ....................... 58
14.1 System Configuration ...................................................................... 58
14.2 System Master .................................................................................. 58
14.3 Plant Host Computer System (Plant DCS) .................................. 58
14.1.3 Tank Data ..................................................................................... 58
Required System Information Form......................................... Appendix 1
Index.................................................................................................... Index 1

6 Saab TankRadar L/2
US Version. Seventh edition, June 1995
Installation Manual
Denominations and abbreviations used in this manual:
BU - Barrier Unit
CLC - Current Loop Card
DAU - Data Acquisition Unit
DMB - DAU Mother Board
DOS - Disk Operating System. An operating system
for PC’s.
DPS - DAU Power Supply board
DXB - DAU Extended Board
EEPROM - Electrically Erasable PROM
FBM - Field Bus Modem
FCC - Federal Communications Commission
FCU - Field Communication Unit
FMCW - Frequency Modulated Continuous Wave
FSK - Frequency Shift Keyed
IS - Intrinsically Safe
JB - Junction Box
LCD - Liquid Crystal Display
OPI - Operator’s Interface
OS/2 - An operating system for PC’s.
PC - Personal Computer
PCB - Printed Circuit Board
PROM - Programmable Read Only Memory
PTFE - Polytetrafluoroethylene. A polymer also mar-
keted as Teflon.
RF-head - A device for emitting and receiving micro-
waves.
RTD - Resistance Temperature Detectors
RTG - Radar Tank Gauge
TH - Transmitter Head
TRL - Tank Radar L (First generation)
TRL/2 - Tank Radar L/2
VAC - Volts Alternating Current
VDC - Volts Direct Current

Saab TankRadar L/2 7
US Version. Seventh edition, June 1995
Installation Manual
1 Introduction to theTankRadar L/2 System
The TankRadar L/2 System is a monitoring and control system for
tank level gauging. The system can interface various sensors, such
as temperature and pressure sensors, for complete inventory
control.
There is a distributed intelligence in the various units of the sys-
tem. The units continuously collect and process information.
When a request for information is received an immediate response
is sent with updated information. The units communicate with
each other on a field bus, the TRL/2 Bus.
No part of the equipment is in actual contact with the product in
the tank and the antenna is the only part of the gauge that is ex-
posed to the tank atmosphere. The Radar Tank Gauge sends mi-
crowaves towards the surface of the product in the tank. The level
is calculated based on the echo from the surface.
TankRadar L/2 can measure the level of almost any product,
including bitumen, crude oil, refined products, aggressive chemi-
cals, LPG and LNG, etc. Using a suitable Tank Connection Unit,
the TankRadar L/2 System can gauge any type of tank.
Operator's
Interface
(IBM PS/2 or
Compaq)
Optional Host
Computer or
Slave PC Optional Second
Tank Group
Modbus
protocol
FBM
RTG Independent
DAU
Slave
DAU Local
Readout
Temp.
sensors
Field bus
RTG RTG RTG
Slave
DAU Slave DAU
Temp.
sensors
RS232C
Control Room Level
Field Level
Temp. Sensors
Press. Transducers
etc
Analog
inputs
Analog
outputs
RTG
Figure 1.1. Example of a small TankRadar L/2 System.

8 Saab TankRadar L/2
US Version. Seventh edition, June 1995
Installation Manual
Group
Level
Field
Level
Temperature
Sensors
Control
Room
Level
Still Pipe
Gauge
DAU
DAU
RTG
Hazardous
Area
Non-
Hazardous
Area
Plant Host
Computer
To Portable
Service PC
with COS
FCU
FBM
To Other
FCUs
Operator's
Interface
TRL/2 Group Bus
TRL/2 Field Bus
TRL/2 Field Bus
RS-232C
RTG DAU
FCU
To Other
Tanks
Alarm Log
Printer
Report
Printer
Parabolic An-
tenna Gauge
RTG
FBM
Temperature
Sensors
LPG/LNG
Gauge
0
0
0
0.200
Cancel
ValueEntry
Enter NewTank
Tank1
Value HiLim LoLim HH Lim LL Lim
TempAvg
Level
Delay Hyst
TempAvg
Level
Pressure
Pressure
LeakLimit
Enable
Auto
Auto
Auto
18.000
120.0
2.0
2.000
80.0
0.0
20.000 1.000
5.0
0.5
0.200
Figure 1.2. Example of a general configuration of a TankRadar L/2 System.
All the measured data is presented to the operator by the
Operator’s Interface, which in its complete version contains inven-
tory functions. A plant host computer can be connected for further
processing of data.
All Saab Tank Control supplied parts for tank top mounting weigh
less than 25 kg (55 lb) (except for pressure flange etc. for the LPG/
LNG Gauge). This makes it possible for one man to carry the
various TankRadar parts to the tank top for installation.
Please read the Technical Description for a more detailed descrip-
tion of the Saab TankRadar L/2 system.

Saab TankRadar L/2 9
US Version. Seventh edition, June 1995
Installation Manual
The basic parts of the TankRadar L/2 System are:
- The Radar Tank Gauge, RTG, is an intelligent explosion
protected instrument for measuring the level of a product
inside a tank. Four different Tank Connection Units can be
attached in order to satisfy a variety of different applications.
- The Data Acquisition Unit, DAU, can interface various
external sensors and actuators. There are two versions of the
DAU, the Slave DAU and the Independent DAU. The Slave
DAU can measure temperature while the Independent DAU,
in addition to temperature measurement , has analog and
digital inputs. Both versions can, as an option, be equipped
with a LCD-display for local readout of the measured values.
- The Field Communication Unit, FCU, acts as a gateway and
data concentrator between the Group Bus and the Field Bus.
Each FCU can have a total of 32 RTGs and 32 DAUs con-
nected to it.
- The Field Bus Modem, FBM, is a converter between RS-232C
and the TRL/2 Bus. It is used for connecting a PC with OPI
(or COS) to the TRL/2 Bus.
- The Operator’s Interface, OPI, is a software for presenting
the values measured in the TRL/2 system. The Operator’s
Interface is also used to set alarm limits, perform setups,
configuration and calibration of the TRL/2 System.
- The Configuration Software, COS, is normally used on a
portable Service PC, operating under DOS. The Service PC
can be connected to one of the FCUs Group Bus ports or
directly to the Field Bus via an FBM. It is used for service,
configuration and calibration purposes. It is not a substitu-
tion for the more powerful OPI.

10 Saab TankRadar L/2
US Version. Seventh edition, June 1995
Installation Manual
2 Safety
TankRadar L/2 equipment is often used in areas where flammable
materials are handled and where an explosive atmosphere may be
present. To protect both the plant and the personnel, precautions
must be taken to ensure that this atmosphere cannot be ignited.
These areas are called hazardous areas and equipment within
these areas must be explosion protected.
A number of different explosion protection techniques have been
developed over the years. Intrinsic safety and explosion proof (or
flame proof) safety are two techniques.
2.1 Intrinsic Safety
Intrinsic safety, IS, is based on the principle of restricting electrical
energy available in hazardous-area circuits such that any sparks or
hot surfaces, that may occur as a result of electrical faults in com-
ponents, are too weak to cause ignition. Intrinsic safety is the only
technique accepted for Zone 0 hazardous areas. It is also safe for
personnel and allows equipment to be maintained without the
need for a gas-free certificate.
For example, the temperature measurement of the DAUs is intrin-
sically safe.
The basic principles of intrinsic safety are:
- All flammable materials are grouped according to the energy
needed to ignite them.
- Equipment located in hazardous areas are classified accord-
ing to the maximum surface temperature that it can produce
and this must be safe with the flammable gases that may be
present.
- Hazardous areas are classified according to the probability
that an explosive atmosphere is present, and this dictates
whether or not a particular explosion protection technique
may be used.
Important!
For trouble shooting and repair work of components in or in connection
to intrinsically safe equipment, strict observance of the following rules is
necessary:
- Disconnect the power supply to the Radar Tank Gauges or the
Independent Data Acquisition Units.
- Use a certified battery operated instrument only.
- Use Saab original spare parts only. Replacement with non-original
spare parts may jeopardize the intrinsic safety.

Saab TankRadar L/2 11
US Version. Seventh edition, June 1995
Installation Manual
2.2 Explosion Proof
Explosion proof enclosures can be used when an explosion can be
allowed inside the enclosure as long as it does not spread to the
outside of it. The enclosure must be strong enough to withstand
the pressure and must have narrow gaps to allow the pressure to
escape without igniting the atmosphere outside of the equipment.
Important!
Any substitution to non-recognized parts may impair intrinsic safety.
The explosion-proof (flame-proof) enclosures of the Transmitter Head and
the Independent Data Acquisition Unit must not be opened while the
units are powered.
2.3 Specific FCC Requirements (US market only)
Saab TankRadar L/2 generates and uses radio frequency energy. If
it is not installed and used properly, that is, in strict accordance
with the manufacturer's instructions, it may violate FCC regula-
tions on radio frequency emission.
Saab TankRadar L/2 has been FCC certified under test conditions
which assume a metallic tank. Installation on a non-metallic tank
is not certified, and is not allowed.
The FCC certificate for TankRadar L/2 requires that the tank is
closed as far as emitted radio energy is concerned. Tanks with
open manholes, external-floating-roof tanks without still pipes etc.
are not covered by the certificate.
To ensure that no installations are made against the FCC rules, the
additional list in Appendix 5 of Tank Data at the end of this
manual must be completed and returned to Saab Tank Control for
evaluation and approval.

12 Saab TankRadar L/2
US Version. Seventh edition, June 1995
Installation Manual
W11W12
FOR
INTRINSICALLY
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W11W12
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W11W12
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ONLY
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Transmitter Head
Parabolic
Antenna
Gauge,
RTG 2930
Still Pipe
Gauge,
RTG 2940
LPG/LNG
Gauge,
RTG 2960
Horn
Antenna
Gauge,
RTG 2920
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3 Description of the RadarTank Gauges
Depending on the type of tank connection unit that the Transmit-
ter Head is mounted on, there are four types of Radar Tank
Gauges:
• The Horn Antenna Gauge, RTG 2920, for fixed roof installa-
tion without still pipe.
• The Still Pipe Gauge, RTG 2940, for measuring in still pipes.
• The Parabolic Antenna Gauge, RTG 2930, for demanding
environments without still pipe.
• The LPG/LNG Gauge, RTG 2960, for liquid gas, LPG and
LNG.
3.1 Transmitter Head
The same Transmitter Head is used on all four types of Radar Tank
Gauges.
Figure 3.1 shows the Transmitter Head

Saab TankRadar L/2 13
US Version. Seventh edition, June 1995
Installation Manual
Figure 3.2 shows the Transmitter Head
3.1.1 Electronic Unit
The Electronic Unit is placed inside the safety enclosure of the
Transmitter Head. The Electronic Unit includes the microwave
unit, and cards for signal processing, data communication, and
power supply with transient protection.
A number of options require that cards are included in the Elec-
tronic Unit.
3.1.2 Cable Outputs
The Transmitter Head has one or two cable outlets. One is for the
non-intrinsically safe power connection and the connection to the
TRL/2 Bus. The other is for the intrinsically safe connection of the
optional Slave Data Acquisition Unit, and/or the optional analog
inputs and outputs of the Current Loop Card. The wires are
clearly marked with numbers and the designation of the wires is
shown on a printed plate at the cable outputs.
W11W12
FOR
INTRINSICALLY
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ONLY
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Intrinsically safe
connection for
Slave DAU
Safety enclosure
Electronic Unit
Mounting
pins for
Weather
Protection
Hood
Non-intrinsically
safe connection
for power and
TRL/2 Bus
Ground connection
Option W-12 Connection Barrier Unit Current Loop Card
Slave DAU 8-wire lead seal Required Not required
Current Loop Card
2 inputs + 2 outputs 12-wire lead seal Not required Required
Slave DAU and
Current Loop Card
2 inputs + 2 outputs 12-wire lead seal Required Required
Current Loop Card
3 inputs + 2 outputs 12-wire lead seal Not required Required
Table 3.1. The table describes what is required when the optional Slave
DAU and/or the optional Current Loop Card are included.

14 Saab TankRadar L/2
US Version. Seventh edition, June 1995
Installation Manual
3.1.3 Power Supply to the RadarTank Gauge
There is a switch on the Electronic Unit for setting of the power
supply to 115 V or 230 V. As standard the switch is set to 230 V.
To select supply voltage, remove the cover of the Safety Enclosure
and set the switch on the Electronic Unit to either 115 V or 230 V.
See figure 3.3
Figure 3.3.
Note: Do not turn
the switch all the
way around as it
may damage the
switch.
MAINS VOLTAGESELECTOR
115V/230V
SELECTED VOLTAGETO
BE MARKED ON OUTSIDE
NAMEPLATE
230 V
115 V
Mains wired for 230 VAC 0.4A
Mark Box if re-wired for 115 VAC 0.8A
Selector inside enclosure.
Serial no: UI:
CAUTION: To prevent ignition of hazardous
atmospheres, disconnect the device from the
supply circuit before opening. Keep assembly
closed when in operation.
Do not open while enrgized.
Ne pas ouvrir sous tension.
Hazardous Location Class I
Group C and D. (Intrinsically Safe
outputs Group A,B,C and D)
Temperature Coide T4.
Leads factory sealed. The device
provides intrinsically safe outputs
See control drawing 9150057-901
Ambient temperature -40 to + 65°C
Box marked when this enclosure
contains Associated Electrical
Apparatus. Component Certificate
BAS Ex91C2065U coded [EExia]IIC
BAS Ex93C2043U coded [EExia]IIB
EEx dIIB T4 T amb = -40 to +65°C
BASEEFA Ex91C1065X
Radar Unit Type TH 2000
Ex
A division of Saab Marine ElectronicsAB
MADE IN SWEDEN
LISTED 939U
Mains wired for 230 VAC 0.4A
Mark Box if re-wired for 115 VAC 0.8A
Selector inside enclosure.
Serial no: UI:
CAUTION: To prevent ignition of hazardous
atmospheres disconnect the device from th
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RTG
name
plate
Mark the box on the
RTG name plate if the
power setting has been
changed to 115 VAC.
RTG
Figure 3.4.
Note: On the label
on top of the Trans-
mitter Head, there is
a box that must be
marked with an "X"
if you set the switch
to 115 V. See figure
3.3. Always check
this label before
connecting power to
the Electronic Unit.
3.1.4 Barrier Unit Card, BU (Option)
The optional Barrier Unit Card is used when a Slave Data Acquisi-
tion Unit is connected to a Radar Tank Gauge. It provides intrinsi-
cally safe power and communication between the Slave DAU and
the RTG. The Barrier Unit is installed inside the Transmitter Head.
The Barrier Unit is connected to the Slave DAU through the Intrin-
sically Safe Connection W12 on the Radar Tank Gauge.
Note: Installation of the Barrier Unit Kit, the Current Loop Card or the
Metrological Seal may only be done by personnel from Saab Tank Con-
trol.

Saab TankRadar L/2 15
US Version. Seventh edition, June 1995
Installation Manual
3.1.5 Current Loop Card, CLC (Option)
The optional Current Loop Card provides intrinsically safe 4-20
mA inputs and outputs. The inputs can be used for example for
pressure sensors, while the outputs can be used for pointer instru-
ments or for output of a measured value as an analog signal.
If a Slave DAU is also connected, two 4-20 mA inputs and two 4-
20 mA outputs are available. If a Slave DAU is not connected, one
additional 4-20 mA input is available, although this transducer
must have its own intrinsically safe power supply.
When the optional Current Loop Card is used, the JB 12 Junction
Box from Saab Tank Control is recommended since the cables are
separated inside the box according to the requirements for intrin-
sic safety. See chapter 7.2.
W11W12
FOR
INTRINSICALLY
SAFECIRCUITS
ONLY
"i"
~2 m cable
with
protective
hose
Transmitter Head with
Current Loop Card
Signal
Power
230/115 V
~2 m cable
with
protective
hose
JB 12 JB 16
Analog
inputs
Analog
outputs
Figure 3.5 shows a Transmitter Head with a Current Loop Card.
3.1.6 Metrological Seal
The Metrological Seal consists of a rod that can activate a write-
enable switch from the outside of the Transmitter Head. This rod
can be sealed in the write-inhibit position to prevent unauthorized
changes in the database.
If there is no Metrological Seal mounted, then the Transmitter
Head is always in write-enable mode.
3.1.7 Installation Data for theTransmitter Head
Ambient operating temperature: -40°C to +65°C
(-40°F to +149°F)
Explosion protection Class 1, Div I, Groups C and D
(UL1203, UL913 USA) and
EEx d[ia] IIB T4 (EN50014,
EN50018 and EN50020 Europe)
Power Supply 115 or 230 VAC, +10% to -15%,
50-60 Hz, max. 80 W
Field bus TRL/2 Bus (FSK, half duplex,
two wires, galvanically iso-
lated, 4800 Baud)

16 Saab TankRadar L/2
US Version. Seventh edition, June 1995
Installation Manual
3.2 Description of the Horn Antenna Gauge, RTG 2920.
The Horn Antenna Gauge is designed for easy mounting in small
size openings on tanks with fixed roof. A flange with a diameter of
8" is enough to mount the RTG 2920.
The RTG 2920 is designed for measurement of a variety of oil
products and chemicals except for bitumen/asphalt and similar
products where the Parabolic Antenna Gauge RTG 2930 is recom-
mended.
The wide beam of the Horn Antenna Gauge is a disadvantage in
narrow tanks with internal structures. In such cases the Parabolic
Antenna Gauge is generally recommended.
The Horn Antenna Gauge is delivered with one of two types of
flanges. One flange is for straight mounting. The other flange is
used for inclined mounting.
See also chapter 10.1 for installation requirements for the Horn
Antenna Gauge.
3.2.1 Installation Data for RTG 2920
Operating temperature in tank Max. +150°C (+300°F)
Min. -40°C (-40°F)
Measuring range 0.85 to 30 m below flange
(2.7 to 66 ft.)
Pressure -0.5 to 2 bar
Total weight Appr. 20 kg (44 lbs.)
Socket size Min. 8"
Weather
Protection
Hood
Transmitter
Head
Cone
Closing
0.35 m
Figure 3.6 shows the Horn Antenna Gauge.

Saab TankRadar L/2 17
US Version. Seventh edition, June 1995
Installation Manual
3.3 Description of the Parabolic Antenna Gauge, RTG 2930
The Parabolic Antenna Gauge RTG 2930 measures level of all
types of liquids, from light products to bitumen/asphalt. The
gauge is designed for mounting on tanks with fixed roofs and has
custody transfer accuracy.
The design of the parabolic antenna provides extreme tolerance
against sticky and condensing products.
See also chapter 10.2 for installation requirements for the Parabolic
Antenna Gauge.
3.3.1 Installation Data for RTG 2930
Operating temperature in tank Max. +230°C (+445°F)
Measuring range 0.8 to 40 m below flange
(2.7 to 131 ft.)
Pressure -0.5 to 2 bar
Total weight Appr. 25 kg (55 lbs.)
Socket size Min. 20"
Weather
Protection
Hood
Transmitter
Head Closing
Inclination
Device
Parabolic
Reflector
Antenna
Feeder
Adaptor
Flange
0.45 m
0.75 m
Figure 3.7 shows the Parabolic Antenna Gauge.

18 Saab TankRadar L/2
US Version. Seventh edition, June 1995
Installation Manual
3.4 Description of the Still Pipe Gauge, RTG 2940
The Still Pipe Gauge is used on tanks with still pipes and with all
products suited for still pipes.
The gauge uses a low-loss radar propagation mode which virtu-
ally eliminates the influence of the still pipe condition. Measure-
ment is made with highest accuracy even when the pipe is old,
rusty and covered with deposits.
The Still Pipe Gauge fits 6", 8", 10" and 12" pipes. It can be
mounted on an existing still pipe and there is no need to take the
tank out of operation during installation.
See also chapter 10.3 for installation requirements for the Still Pipe
Gauge.
3.4.1 Installation Data for RTG 2940
Operating temperature in tank Max. +230°C (+445°F)
Measuring range 0 to 40 m from cone end
(0 to 131 ft.)
Pressure -0.2 to +0.5 bar
Total weight Appr. 20 kg (44 lbs.)
Still pipe dimension 6", 8", 10" or 12". See table 10.1
for information on schedules.
Transmitter
Head
Transition
Cone
Waveguide
Unit
Waveguide
Connection
Stand
Sealing
Weather Protection Hood
Still pipe
Figure 3.8 shows the Still Pipe Gauge.

Saab TankRadar L/2 19
US Version. Seventh edition, June 1995
Installation Manual
3.5 Description of the LPG/LNG Gauge, RTG 2960
The RTG 2960 is designed for level measurement in LPG and LNG
tanks. A still pipe is required for the measurement. It prevents a
wavy or boiling surface from disturbing the measurement. Radar
signals are transmitted inside the pipe towards the surface.
The pressure sealing is a quarts window approved for use in
pressure vessels. As standard the gauge is also equipped with a
fire-proof block valve and a vapor space pressure sensor.
The LPG/LNG Gauge is available in three different versions, a 150
PSI version, a 300 PSI version and a 600 PSI version.
The patented reference pin function enables verification of mea-
surement without opening the tank. There is a Reference Pin at the
top of the still pipe and a Reference Plug made of epoxy resin at
the bottom. If epoxy can not be used in the tank, two or three
reference pins can be used without the Reference Plug. By setting
the gauge into "test mode" it measures against these references
and compares with the actual distances to these references that
were stored during installation.
See also chapter 10.4 for installation requirements for the LPG/
LNG Gauge.
3.5.1 Installation Data for RTG 2960
Operating temperature in tank Stainless steel flange -66°C to +
90°C (67°F to 194°F)
Measuring range 0 to 40 m from cone end
(0 to 131 ft.)
Pressure Up to 25 bar (375 PSI)
Still pipe dimension 4" Sch. 10 or 100 mm inner
diameter.
Total weight 150 PSI – appr. 38 kg (84lbs)
300 PSI – appr. 48 kg (106 lbs)
600 PSI – appr. 68 kg (150 lbs)
W11W12
FOR
INTRINSICALLY
SAFECIRCUITS
ONLY
"i"
6" Existing
pressure
vessel
flange
1.0 m
0.35 m
Lower Flange
Weather
Protection
Hood
Transmitter
Head
Valve
Pressure
Transducer
Pipe Cone
4" or ø100 mm
Still Pipe
Housing
Figure 3.9 shows
the LPG/LNG
Gauge.

20 Saab TankRadar L/2
US Version. Seventh edition, June 1995
Installation Manual
4 Description of the Data Acquisition Units
The Data Acquisition Unit, DAU, is a complement to the Radar
Tank Gauge and it can interface various external sensors and
actuators. There are two versions of the DAU, the Slave DAU and
the Independent DAU. Both types have interfaces for temperature
measurement.
Figure 4.1 shows the Slave DAU and the Independent DAU.
4.1 Connection of the Sensors
The DAUs can connect up to 14 RTDs (Resistance Temperature
Detectors) on the X21 terminal on the motherboard. See figure 4.2.
Under the lid of the Data Acquisition Unit there are instructions
printed as to how to connect the sensors and transducers.
43
40
37
34
31
28
25
22
19
16
13
10
7
4
1
44
41
38
35
32
29
26
23
20
17
14
11
8
5
2
45
42
39
36
33
30
27
24
21
18
15
12
9
6
3
Connect
temperature
sensors
DAU
Connect Reference
Resistor to terminals
43, 44 and 45.
Figure 4.2 shows the wire terminals for the temperature sensors.