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Reference Manual
00809-0100-3003
1
Introduction
1.1
Product overview
The GDU-Incus is an ultrasonic gas leak detector used for detecting airborne ultrasound
generated from pressurized gas leaks. Airborne ultrasound is generated when gas moves
from a high pressure area to a low pressure area with a ratio in excess of 1.8 to 1 upstream
to downstream. However, Emerson only recommends this detector for pressures above 2
bar (30 psi) gauge. The intensity of airborne ultrasound generated is dependent on a
number of factors including gas pressure, gas leak size, and gas temperature.
The detector uses four individual Piezo ceramic sensing heads designed using a patent-
pending floating crystal design. The sensor design makes the sensing heads virtually
indestructible and totally immune to temperature, moisture, and other contaminants
found in hazardous areas. The detector uses a continuous electronic monitoring test
feature to ensure complete functionality.
The detector has a large dynamic range, which allows use in a wide range of applications,
from offshore platforms to gas transportation systems. The multi-stage amplifier ensures
a linear output across the entire detector range without drop-off at each end of the range.
The detector is not designed to detect specific gas types, LEL, or ppm. It responds
instantaneously to the ultrasound produced by a wide range of gas leak sizes and remains
unaffected by even the most extreme weather conditions. The detector is rated to IP66/
IP67 and NEMA
The detector is supplied with a 4-20 mA analog output and a HART
1.2
Service support
To expedite the return process outside of North America, contact your Emerson
representative.
Within the United States, call the Emerson Response Center toll-free number
1-800-654-7768. This center is available 24 hours a day to assist with any needed
information or materials.
The Response Center will ask for product model and serial numbers and will provide a
Return Material Authorization (RMA) number.
The Response Center will also ask for the installation and application details.
WARNING
Hazardous substances
Individuals who handle products exposed to a hazardous substance can avoid injury if they
are informed of and understand the hazard. If the product being returned was exposed to
a hazardous substance as defined by the Occupational Safety and Health Administration
(OSHA), a copy of the required Material Safety Data Sheet (MSDS) for each hazardous
substance identified must be included with the returned goods.
Reference Manual
®
Type 4X to withstand harsh environments.
Introduction
December 2020
®
interface.
7
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