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The hydrostatic level sensors AHD-S 200 and AHD-S 200H were developed for navigation and offshore applications to monitor levels in tanks and reservoirs and gauge the tide.
The fully ceramic measuring cells are especially suitable for the measurement of slight differences in tide levels. The housing consists either of 1.4571 high-grade steel or of CuNiFe, making it suitable for the measurement of all liquid densities.
The sensors fulfill the requirements of Germanischer Lloyd and DNV, on request also the ATEX criteria.
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Due to its compact and durable design, the pressure transducer AHD-S 230 is capable of dealing with all kinds of measuring tasks, such as applications in shipbuilding as well as for use in offshore facilities.
All measuring parts are completely made of Cr-Ni steel. The housing complies with IP65 at minimum. The pressure transducer runs on variable DC voltage and supplies an output signal of 4 - 20 mA.
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The system is designed for level gauging in ballast and service tanks. It can be interfaced to an Integrated Automation System or operate as a stand-alone system. All system components are designed and manufactured to work in a rugged marine environment. The system is type approved by all major classification societies
Key features
Individual level sensors, based upon rugged and accurate pressure transmitters made in titanium
Level and volume presentation
Standard corrections for vessel trim and list
Atmospheric pressure correction as standard for installations with submerged level sensors
Easy and inexpensive installation /refit
At site configuration, simple alarm setting (level - high or low) and liquid density parameter setting
Easy manual settings of specific sensor inputs in case of sensor failures
Internal alarm buzzer and output for other alarm devices
Delivered with 220/24V power supply as standard
Options
Our ballast and service tank gauging system has a flexible design and can be offered with the following optional features:
Serial interface to other presentation systems or load calculator. The serial interface is RS232 or RS485 and is based on the well-proven ASAP protocol
Cabinet (600 x 600 x 360) mm for wall mounting including power supply, zener-barriers, termination, etc.
Monitoring of tank temperatures and miscellaneous pressures
Inclinometer for trim and list
Draft measurements
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Surveyor Automatic digital microwave oil-water interface detection system with tank level and temperature monitoringn
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The CT801LB/S-B transmitter is designed to be mounted on the top of
the tank. The CT801LB/S-B allows a remote level measurement using a
4-20 mA analog output, while keeping the principle of bubbling.
The lack of (air or neutral gas) supply pressure is not a problem for the
CT801LB/S-B. An automatic valve is activated as soon as the supply
pressure falls below 1 bar. When this valve is closed, the liquid cannot
return back to the bubbling line up to the transmitter.
For pressurized tanks, the level is deduced from the differential
pressure measurement between the bubbling probe and the pressure
of the inert gas above the liquid. The air or neutral gas supply is
protected by means of a filter.
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Tank Gauging Device
The API TGD (Tank Gauging Device) is a multi-functional device, which measures a cargo tank’s level and pressure as well as temperature and density of the cargo. It is based on patented principle of Guided Low Frequency GLF™ wave propagation, which allows equal precise accuracy of measurement along tank height in any shape of tank. The tank gauging device has been developed to work with the highest level of accuracy in any type of liquid, oil products, liquefied gases, acids, solvents and other chemicals preventing any waste without influence of foam from surface.
The data from the API TGD is transferred to the control room through just two cables, thus reducing the cost of lengthy cabling throughout the tanker. The tank gauging device has four integrated measuring channels:
- Low frequency non contact level gauge with accuracy of 2 mm
- Multiple thermo sensors for temperature profile measurement in the tank
- Density sensors
- Inert Gas Pressure sensor
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The GL-3C is a high quality level switch with a capacitive sensing element. The sensor is applicable in most liquids with low or medium conductivity, including all oil products and most relevant chemicals. The switch is intended for controlling liquid levels in tanks; flow/no flow conditions in pipes etc.
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The Lidec level detector type L92B, specially designed for maritime
applications, offers an exclusive solution for detecting the level of
liquids.
The Lidec L92B is based on the propagation of a surface wave. This
design does not include any moving part. The reliability of the device is
ensured by a built-in function which monitors electronic or transducer
failures.
Lidec L92B is designed to be installed on the deck. Also, it requires no
calibration as not influenced by any type of fluid.
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The Lidec L20D is based on the propagation of a surface wave. This
design does not include any moving part. The reliability of the device is
ensured by a built-in function which monitors electronic or transducer
failures.
The Lidec L20D designed to be installed horizontally (or vertically), can
be used for all types of liquids. Also, it requires no calibration as not
influenced by type of fluid.
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Liquid Level Switch
The API UTS™ Liquid Level Switch works on the principle of distributed acoustic wave in a metal rod.
The API UTS™ is installed outside the tank with only the metal rod inside the tank. Acoustic waves in the metal rod created by piezo-electric ensure transmission of signals. When the liquid in the tank reaches the probe on the rod, the emission of sound waves is muffled. This change is picked up by the piezo-electric and signals are transmitted to the corresponding alarms.
Patented in EU, USA and Japan.
The API UTS™ Liquid Level Switch is a series of sensors that can make up part of various control systems and is designed in more than 300 modifications.
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Surveyor%u2122 Cargo Level is a complete automatic level gauging and cargo monitoring system for tankers. The system is one of the most comprehensive and accurate systems available for this specific application. Together with advanced signal handling and computer technology, the functions included are as follows:
Level gauging in cargo, slop, ballast, and fuel oil tanks
Density measurement in cargo, slop, and fuel oil tanks (only with pressure sensors)
Vapour (inert gas) pressure in cargo and slop tanks
Draft measurement
Loading computer for on/offline stability and stress with load planning
Print out of cargo and transfer reports
Interface for communications with other systems available
High level and overfill
Pump and valve control system
As all parts and functions are based on the same sensor technology, the system is very cost effective and operationally efficient for the users. The modular and compact design makes the Surveyor%u2122 Cargo Level an attractive alter- native for new-building or retrofit installations. Separate ballast gauging systems or complete cargo tank systems available for installations on board any type of vessel. Surveyor%u2122 Cargo Level has been successfully installed on board chemical and oil tankers as well as product and container vessels and recognized as a cost- effective, reliable and user-friendly system.
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The PL3700 series is a ceramic family transmitter withstanding attack from most petroleum and chemical products. The 316L stainless steel remote electronic box is especially designed for deck installation and includes the amplifier with zero and span adjustment.
The PL3700 is linearised. The pressure transducer is sealed inside a stainless steel 316 L housing which ensures an IP68 rating.
Flexible conduits are supplied in standard for watertight connections on deck.
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Non-contact Microwave Radar
One the few marine microwave ullage gauges featuring power and 4-20 mA signal on a two core cable, thus providing for simple, fast and cost effective installation for both new-buildings and retrofit projects. Because of its unique design and technology there is no need for large and tall adapter trunks in order to fit radar to deck.
System provides for automatic trim and list correction and allows exported level either at flotation center of the tank, at the sensor location or at the sounding pipe.
Radar Applications
Crude Oil Tanks
FPSO Tanks
Chemical / Products Cargo Tanks
LNG Tanks
Deck / Slop Tanks
Solids Cargo Tanks
Ballast, Fuel and Service Tanks
Advantages
High accuracy in all kinds of cargo.
Compact design and easy installation.
Superior technology allowing fitting close to tank side and on smaller tanks as well.
For Chemical and Oil/Products tank installations a special PTFE flange seal provides a non stick surface that eliminates cargo build-up on the radar antenna.
Measuring in solid cargoes that previously could not be done accurately with radar.
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The 8" EM540 radar is especially designed to be integrated within a
dedicated cargo monitoring system for inland vessels. It may be used
for other simple tankers.
The EM540 radar is based on the use of smart sensors including
microprocessors performing signal processing. In addition to transmitting
tank level, pressure, and temperature data to the central monitoring system,
it offers such capabilities as self-diagnostics, self-monitoring and remote
configuring.
The use of an intrinsically safe two-way digital signal transmission,
between the radar and the central monitoring system, provides for an easy
integration of the EM540 Radar into any type of control system.
The EM540 radar is compliant with certification rules and regulations
issued by international classification societies.
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The EM940 Radar is particularly suited for tanker sophisticated applications
such as chemicals, products, bitumen... The EM940 Radar is associated
with two specific IS racks: the TA3840C dedicated to "communication" and
the TA3840S for power supply.
The radar measurement head features a very compact design thanks to a
wide band printed circuit and a planar antenna. The use of an intrinsically
safe digital signal transmission between the radar and the central
monitoring system provides for an easy integration of the EM940 Radar
into any type of control system.
The EM940 radar is compliant with certification rules and regulations
issued by international classification societies.
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electronic pressure transducers type G1, ceramic sensor cell, delivered ready calibrated to the pressure height, calculated from tank height minus tank offset, multiplied with given density of the tank medium. Adaptation to changing specific weight and/or tank offset are not possible when once defined.
-Exactitude: better 0,2 % FR, at least
- Overpressure: at least 4 bar overpressure safe, Temperature range: valve body 25 ... + 85 °C, membrane --40 ... 125 °C
-Materials: membrane AL2 O3, body stainless steel 1.4305
- Connections: dry installation flange DN 25, PN16 submerged installation guided inside supporting pipe.
- Electric connection: two-wire-system, supply 24 V DC, 11- 32V
- Output: analogue 4 - 20 mA
- Protection degree: IP68 for dry and submerged installation
-Recommendation: submerged installed sensors should be accessible or removable without entering into the tank.
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The system consists of Gauge Heads, ready assembled with air-throttle valve, non return valve, and electronic pressure transmitter IP 68. The gauge head to be mounted to a yard supplied 1 measuring pipe, which is guided into the corresponding tank to a level 3 cm above tank bottom. The Gauge Head is provided with a 12 mm cutting ring connection for connection to a common working-air circuit with supply-air pressure reduced to 3 to 3,5 bar. By the throttle valve the air bubble flow is reduced to max. abt. 30 ltr./h to the tank or draft measuring point. The non-return valve assembled with the Gauge Head secures the air-circuit and the pressure transmitter against tank fluid flowing back into the pneumatic circuit. The signal pick-off is rendered by an electronic pressure transducer type G1-S with ceramic sensor cell with high purity aluminium oxid membrane, providing analog signals 4 - 20 mA corresponding to the air-overpressure in the measuring pipe. Signal generation: capacitive sensor cell with full range individual temperature compensation stored on cell, sensor cell and amplifier in one common housing, zerosetting without influence on span-setting. Tuning: to straight value in excess of max. obtained pressure, allowing easy installation and adaptation to individual tank at indicating instrument.
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