Rosemount Incus Specifications

Incus Ultrasonic Gas Leak Detector

FGD-PDS-Incus-Ultrasonic-Gas-Leak-Detector

Incus Ultrasonic Gas Leak Detector

Wide Area Coverage for Pressurized Gas Leaks

The Incus is an advanced gas leak detector that
uses four sensitive acoustic sensors to monitor
wide areas for the ultrasound generated from
pressurized gas releases.

Ideally suited for monitoring ventilated outdoor applications,
the Incus has been engineered to withstand extreme
conditions. Detection is unaffected by inclement weather, wind,
leak direction, or gas dilution, with fast speed of response.

 Instantaneous response to all gas leaks

(toxic, combustible, or inert).
 Operates in extreme temperatures.
 Automated electronic self-test offers failsafe operation.
 Widest area of coverage through four independent sensors

4–20 mA analog or stepped and HART® communication

protocol.
 Certied worldwide for hazardous locations.
 Innovative mapping tool helps optimize coverage for a

target risk.
 Programmable time delays screen intermittent unwanted

alarm sources.

Four multi-directional sensor heads

Quad sensing heads provide the widest overall detection range
available on the market. The sensing heads are independent
with the detector output being based on the highest ultrasound
measured by any one head. If one or more sensing heads fails,
complete coverage is not lost.

Sensor design - they Just keep working

Each sensor is completely free of moving parts and will not age,
drift, or ever need replacing under normal operating conditions.
The sensors provide maintenance free protection with proven
reliability.

Continuous self-test ensures
instrument health

Electronic self-test checks the detector every 320 ms by
sending an amplitude signal through the sensing circuitry.
The sensor suffers no loss of detection while in test mode in
contrast to those based on diaphragm microphones.

Incus Ultrasonic Gas Leak Detector

Product Data Sheet

July 2017

Field-proven ultrasonic sensor principle

Incus responds to the ultrasound produced by pressurized

gas releases, a technology proven with hundreds of detectors
installed worldwide.

Sealed sensor housing

Piezoceramic sensor heads have no moving parts and can

therefore be completely sealed against moisture, corrosive
atmospheres, and industrial contaminants.

Built for extreme conditions

The Incus is designed to operate at -40 °C to +85 °C (-40 °F to
+185 °F)and may be supplied for monitoring areas of regard
at -55 °C (-67 °F). Corrosion resistant stainless steel housing is
standard, units are ingress rated to IP66/67 or NEMA Type 4X.

Incus Ultrasonic Gas Leak Detector

Fixed Toxic

Gas Detection

RESPONSE LEVEL 2

Pressurized Gas Release Response Levels — Detect • Distinguish • Defend

Toxic Cloud

Formation

Liquid

Accumulation

High Pressure

Jet Fire

Wide Area

Explosive Fire

Deep Pool

Fuel Fire

Pressurized

Gas Leak

EXPLOSION

EVENT

IGNITIONIGNITION

IGNITIONIGNITION

IGNITIONIGNITION

Ultrasonic Gas
Leak Detection

RESPONSE LEVEL 1

DETECT DEFENDDISTINGUISH

Fixed Combustible

Gas Detection

RESPONSE LEVEL 2

Optical

Flame Detection

RESPONSE LEVEL 3

Explosive Cloud

Formation

Ultrasonic detection overview

Ultrasonic (acoustic) gas leak detection technology functions
through the constant monitoring of wide areas by advanced
acoustic sensors specially tuned to process ultrasound emitted

from pressurized gas leaks. Ultrasonic gas leak detectors
do not have to wait until a hazardous gas concentration has

accumulated or the gas cloud has made physical contact with
a sensor. In addition, the response is instantaneous for all gas
types (Figure 1).

Simply put, the ultrasonic gas leak detector only triggers an
alarm when inaudible, ultrasound is detected (between 25 and

100 kHz), which is only produced with the release of highly
pressurized gas (Figure 2). This makes for reliable and efcient

detection; since ultrasonic gas leak detectors are immune to

poisoning, it never requires eld calibration, and all intermittent

sources of background ultrasound noises may be ignored by
time delay settings.

Figure 2

Audible Sound 0 KHz to 20 KHz - Turbines, motors, and

compressors generate within this frequency range

Human Hearing Range

Figure 3

July 2017

Incus Detection Range

Ultrasonic Sound 25 KHz to 100 KHz

Beyond Human Hearing Range

Figure 1

The Incus detects gas leaks at the speed of sound while
providing wide area coverage. It is unaffected by inclement

weather, wind, leak direction, and gas dilution or stratication.
When used with Emerson’s point gas and optical ame

detectors, a complete and comprehensive safety system is
ensured (Figure 3).

2 www.Emerson.com/FlameGasDetection

July 2017

Incus Ultrasonic Gas Leak Detector

Specifications

Table 1 - Incus Ultrasonic Gas Leak Detector

Incus

Detection frequency range 25 kHz to 100 kHz

Dynamic range 40–120 dB (standard); 58–104 dB or 40–200 dB

Area coverage 2 to 20 meters (7 to 65 feet) radius (leak pressure, size and background level dependent)

Response time Instantaneous (< 1 s - speed of sound)

Programmable alarm delay Congurable alarm delay via one second increments

Operating temperatures -40 °C to +85 °C (-40 °F to +185 °F), option -55 °C (-67 °F), NOT c FM us approved

Operating humidity range 0 to 100 % relative humidity, non-condensing

Self test Continuous electronic check of sensor integrity

Ingress protection Rated IP66/67 & NEMA Type 4X to withstand harsh environments

Enclosure material AISI 316 stainless steel

Mounting bracket AISI 316 stainless steel (included)

Weight (with bracket) 18 kg (40 lb)

Conduit entry ½ in. or ¾ in. NPT available as single entry (all listings) or M20/M25 single entry and all dual entry

Output signals Analog [0 mA: zero/low power,

Approvals/classifications IECEx ITS 10.0004X

Input voltage 24 Vdc (15 to 30 Vdc)

Power consumption 6 W - standard operation

Warranty 18 months after shipment or 12 months after installation, whichever comes rst

(all listings EXCEPT FM)

0.5 mA to 4.0 mA: detector
faults, 4–20 mA]

ATEX Ex d ib IIB+H2T4 Gb (Tamb -40 °C to +85 °C); (Tamb -55 °C to +85 °C) option
c FM us CL1 Division 1, GP B, C, D T4

CL1 Zone I, AEx/Ex d ib IIB+H2 T4

EAC RU C-GB.ГБ04.B.00297
KOSHA: 14-KB4BO-0294X
INMETRO UL-BR 15.0063X
ABS: 13-LD1021861
DNV: A-13745
SIL 2 suitable
EMC: EN 50270 2006, EN 61000-6-3 2007, EN 61000-6-2 2005

Two form C relay contacts
[Error/fault, alarm, maintenance]

HART® protocol

Ordering information

Accessories

- GDU-01-TT

Test transmitter: handheld
rechargeable ultrasonic sound
emitter

- GDU-01-MT

Mapping tool: handheld
rechargeable ultrasonic sound
receiver

- GDU-PTV

Performance target verication kit

3www.Emerson.com/FlameGasDetection