Rosemount TGU 68
Product Data Sheet
November 2016
DS 2000-10-009 Ed 02
Rosemount TGU 68
Tank Radar Gauge, Parabolic Antenna
Rosemount TGU 68 Tank Radar Gauge, Parabolic Antenna is a marine non-contacting radar level gauge
that is integrated in the Rosemount Cargo Monitoring System (CMS). It is designed to be used in harsh
conditions on tankers and offshore installations, and has a superior robustness and accuracy under all
tank conditions.
The Rosemount TGU 68 Tank Radar Gauge, Parabolic Antenna comes in two versions. The TGU 68C is
the best choice for measuring ullage on tankers and marine applications, and the TGU 68S is ideal for
offshore market needs. The TGU 68C can optionally be installed with a hinged heat protection for use
on heated cargoes.
TGU 68 can have up to three independent measurement channels in the same unit.
„„ 26 GHz FMCW tank radar gauge, with advanced
signal processing, high bandwidth and optimized
parabolic antenna
„„ Accurate and reliable measurement that keeps
you operating under adverse conditions in tank
„„ For tankers and offshore installations with 35 m
measurement range
„„ Robust, withstands harsh conditions on deck
„„ Easy to install, light weight and narrow beam
„„ Optional integrated vapor pressure sensor
„„ Optional level redundancy measurements
„„ Optional independent high level and overfill
alarm measurements
Rosemount TGU 68
November 2016
Description
TGU 68
Connections
The Rosemount TGU 68 Tank Radar Gauge, Parabolic Antenna,
is suited for installation on general tanks with a tank height of up
to 35 meter. The unit is equipped with a parabolic antenna, and
is mounted on an 8” deck socket.
Optional digital bus connections to:
The gauge is intrinsically safe and operates based on 26 GHz
FMCW radar technology. The advanced signal processing, the
high bandwidth and the optimized parabolic antenna gives a superior robustness in measurement. The TGU 68 keeps operating
under the most difficult conditions in the tank and on the deck.
The narrow beam of ±2° makes it easy to install on tanks.
TGU 68C
The TGU 68C is the ideal choice for measuring ullage on tankers and marine applications, from the smallest up to the largest
tanks.
TGU 68S
The TGU 68S fits the offshore market needs with the demand for
more options in installation, test and certification.
One digital bus connection to the Rosemount SCU 51 Supply
and Communication Unit in the control room per level measurement channel.
• Rosemount TMU 51/53 Temperature Measuring Units
• Rosemount TGD 51 Tank Gauge Display
• Rosemount WTU 51 Tank Cleaning Monitoring
Vapor Pressure Option
An optional vapor pressure sensor can be mounted as an integrated part inside the TGU 68. The vapor pressure sensor provides the relative pressure inside the tank.
Redundancy and High Level / Overfill Options
The gauge is as standard equipped for level measurements, but
is prepared for optional redundant level or independent high
level or overfill alarm measurements.
Rosemount Cargo Monitoring System
2
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November 2016
Rosemount TGU 68
Radar Principles
The FMCW radar used in Rosemount CMS emits radar waves
continuously at a known range of frequencies. The transmitted
radar frequency is increased over a time creating a sweep. The
reflected signals is then mixed with the transmitted signals creating a low frequency signal that is proportional to the product
level. The signals are digitally processed and presents a very accurate reading of the distance to the product level.
The main advantages for using radar for tank gauging are:
• Radar waves are extremely robust to any conditions in the
tank
• Radar waves are generally not affected by the atmosphere
above the product in the tank
• The only part located inside the tank is the antenna without
any moving parts
• High reliability
• High accuracy
• With Rosemount CMS, the Tank Gauge Electronics can easily
be serviced and replaced during closed tank conditions.
Deck Socket
The TGU 68C and TGU 68S is as standard mounted on a TGS 58
Tank Gauge Socket with a service opening for easy cleaning of
the antenna. The TGS 58 Tank Gauge Socket is normally supplied
by yard.
As an alternative mounting method, a TGS 68 Hinged Heat Protection can be used for heated cargoes such as Bitumen.
Rosemount TGU 68 Tank Radar Gauge, Parabolic Antenna
mounted on Rosemount TGS 58 Tank Gauge Socket.
Rosemount TGU 68 Tank Radar Gauge, Parabolic Antenna
mounted on Rosemount TGS 68 Hinged Heat Protection
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The TGS 58 Tank Gauge Socket and the TGS 68 Hinged Heat Protection are presented in separate product data sheets.
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Rosemount TGU 68
November 2016
Technical Specification
TGU 68
General Specification
Antenna type
Parabolic antenna
Measuring range
0 to 35 m
Instrument accuracy
±2 mm
FMCW centre frequency
26 GHz
Half power beam width
±2° (lobe angle from antenna axis)1
Operating temperature in tank 2
-40 to +100° C
Operating pressure in tank
-100 to +500 mbar
Electrical Specification
Cable to control room
Up to 3 cables with two or three twisted pairs with common shield.
Max length approximately 400 m
Number of cable inlets
1 to 3
Cable diameters
6 to 21 mm
Field bus
Proprietary intrinsically safe
Microwave output power
<1mW
Mechanical Specification
Flange
Suitable for mounting on JIS 5K-200, DN200, ASME 8”
Weight
17 kg (35 lbs.)
Material facing tank atmosphere
Stainless steel 316L, PTFE, Fluorsilicon (standard)
Material facing deck
Stainless steel 316L
Deck socket
350 mm with service opening
500 mm with service opening
Heat insulating hinged socket (Bitumen and heated cargoes)
3
Environment Specification
Ingress protection
Ambient temperature
IP 66/67
4
Humidity
-40 to +70° C
0 - 100% relative humidity
Vapor Pressure Option
Operating range
-100 to 900 mbar
Instrument accuracy
±3 mbar
Material facing tank atmosphere
Stainless steel 316L and Alloy C276
Approvals
Marine type approvals
ABS, BV, CCS, DNV-GL, KR, LR, NK, RINA
Explosion protection
Intrinsically safe:
ATEX:
II 1G Ex ia IIC T4 Ga
IECEx: Ex ia IIC T4 Ga
INMETRO: Ex ia IIC T4 Ga
1) For details see Reference Manual.
2) Operating temperature in tank Increased to +260° C when mounted on TGS 6810
3) Normally yard supply
4) Ambient temperature maximum decreased to +60°C when mounted on TGS 6810
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Rosemount TGU 68
November 2016
Ordering Information
Ordering Information
TGU 68C TGU 68S Comments
Flange
Housing, flange JIS 200A / EN DN200
√
Housing, flange ASME B16.5 8”
√
√
Gasket Material
O-ring, fluorsilicone
√
√
√
√
Tank Gauge Electronics box 26 GHz, 1 channel
√
√
Tank Gauge Electronics box 26 GHz, 2 channels
√
√
Tank Gauge Electronics box 26 GHz, 3 channels
√
√
√
√
Vapor Pressure Sensor
Vapor Pressure Sensor, -100 to 900mBar
Option
Measuring Channels
Hazardous Locations Certification
ATEX, IECEx Intrinsic Safety TGU 68
INMETRO, Intrinsic Safety TGU 68
√
Cable Glands
Cable gland M20
√
√
Option 1-3 glands
Cable gland M25
√
√
Option 1-3 glands
Cable gland M32
√
√
Option 1-3 glands
√
Option 1-3 glands
Special
Optional Items
Protective hose for Cable Gland
√
√
Option
Flange JIS 5K 40A for Protective hose
√
√
Option
Flange JIS 5K 50A for Protective hose
√
√
Option
Flange PN10 DN40 for Protective hose
√
√
Option
Bolt Kit (Gauge socket)
√
√
Option
Gasket (Gauge socket)
√
√
Option
Metal label (TAG plate)
√
Option
Calibration certificate
√
Option
Material traceability certification acc. to EN 10204.3
√
Option
√ = Available
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5
Rosemount TGU 68
Product Data Sheet
DS 2000-10-009 Ed 02
November 2016
Dimensional Drawings
All dimensions in mm
©2016 Emerson Automation Solutions. All rights reserved.
The Emerson logo is a trademark and service mark of Emerson Electric Co. Rosemount and the
Rosemount logotype are registered trademarks of Rosemount Inc. TankRadar is a trademark
of Rosemount Tank Radar AB. Rosemount Tank Radar AB is a member of the Emerson family of
companies. All other marks are the property of their respective owners.
Emerson Automation Solutions
Rosemount Tank Radar AB
Box 150
SE-435 23 Mölnlycke
T +46 31 337 00 00
F +46 31 25 30 22
www.Emerson.com/marine
The contents of this publication are presented for information purposes only, and while effort has
been made to ensure their accuracy, they are not to be construed as warranties or guarantees,
expressed or implied, regarding the products or services described herein or their use or
applicability. Standard Terms and Conditions of Sale can be issued by contacting Rosemount Tank
Radar AB. We reserve the right to modify or improve the designs and specifications of our products
at any time without notice. Rosemount Tank Radar AB accepts no responsibility for any errors that
may appear in this publication.
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