Kongsberg GLA-310/5 DUAL Radar Tank Gauge

RADAR TANK GAUGE FOR GAS CARRIERS

The KONGSBERG Radar Tank Gauge (RTG), GLA-310/5 DUAL is

designed for redundant measurement of level in tanks containing

liquefied gases. Accurate measurement is possible regardless of

the tank amospheric conditions. Flexible design ensure easy

adaptation to LPG (Propane, Butane), LEG (Ethylene, Ethane),

VCM, liquefied Ammonia (NH3) and LNG.

Principle of operation

The RTG employs the Frequency Modulated Continuous Wave

(FMCW) principle with dual sweep technology to eliminate

Doppler-effect caused by cargo movement. Frequency sweep

ing microwave signals are emitted from two separate electronic

units and through a common standpipe. The distance (i.e. the

ullage) is derived from the time delay of the reflected signal.

The standpipe is assembled by sections adjusted to match the

total tank height. The pipes have ventilation holes allowing the

vapour pressure inside and outside the pipe to stabilize, thus

allowing the liquid to rise or fall unimpeded in the pipe.

Each pipe section is supplied with flanges prepared with refer

ence markers. The liquid level and the markers are measured

simultaneously, so the system automatically verifies itself at

every measurement. By careful calibration of the pipe sections

length before installation, the positions of the markers are re

corded and stored in the system. By comparing the liquid echo

with the signature plate echo, a continuous auto-calibration of

the measurement is done.

The electronic units in the RTG includes a patented signal

detection method that ensures optimum performance. Com

bined with its superb signal-to-noise ratio, GLA-310/5 offers the

highest measurement reliability and accuracy.

Each electronic unit is connected to a dedicated signal process

ing unit, where the AutroCAL® principle is employed.

AutroCAL®

AutroCAL® is a unique calibration and verification function in

the KONGSBERG system. Gas vapour density and mixture of

gases influence the propagation speed of the radar signal, thus

the accuracy of the measurement. By using pipe joint reference

markers, AutroCAL® continuously compensates for the changes

caused by the differences in the propagation speed. AutroCAL®

ensures high accuracy over the whole measurement range,

independent of the gas mixture, pressure and temperature.

With AutroCAL®, the influence of the gas vapour density and

composition is measured and compensated for automatically.

FEATURES

• Closed level gauge suitable for all liquefied gas tank designs.

• Measuring range 0 to 50 metres.

• Outstanding accuracy in the whole range.

• Superior sensitivity - suitable for precise measurement of

products with low dielectric constant.

• Dual transmitter with independent units, providing primary &

secondary level gauging.

• Combined level and TOP functionality s subject to case-by

case approval by class

• Each transmitter connects to its dedicated signal processing

unit with power and IS barrier.

• Approved for Custody Transfer (CTS) on board ships.

• Continuous level verification - AutroCAL®

• Utilize 50 mm standpipe.

• Modular design.

• Intrinsically safe for use in all zones.