Gas Detection in Refining
Maintain safe working conditions in refineries
Reliable Combustible & Toxic Gas Leak Detection
Continuous combustible and toxic gas monitoring is critical within a refinery as many hazardous areas exist. Gas or vapor leaks from crude desalting, thermal cracking, coking, catalytic cracking or isomerization processes can start fires if an ignition source is found. Some processes produce wastewater streams (sour waters) that contain dissolved hydrogen sulfide and ammonia gases, in the form of ionic ammonium hydrosulfide, and can occur at lethal concentrations. The hydrogen generation process can create hazardous gas leaks. Monitoring the hydrogen sulfide content of the feedstock is essential to prevent harm to personnel or the environment. Rosemount™ gas detection products help to keep people and equipment at refineries safe by providing accurate and continuous gas leak monitoring.
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Product Solutions
The Rosemount 928 Wireless Gas Monitor detects hydrogen sulfide (H
2S), carbon monoxide (CO), and oxygen depletion (O
2) in remote applications previously too challenging and costly to monitor. This wireless toxic gas monitoring system enhances worker safety through early gas leak detection, simply integrates with
WirelessHART® technology, and eliminates the need for expensive wiring. The Rosemount 928 Wireless Gas Monitor easily connects to the Rosemount 628 Universal Gas Sensor which consists of a tool-less-hot-swappable smart sensor module.
- Hot-swappable electrochemical sensor module with end-of-life diagnostics can be installed in the field without tools
- Replaceable, intrinsically safe lithium-thionyl chloride power module has over two years of service life and can be easily exchanged in hazardous field locations
- WirelessHART technology is secure, cost-effective and delivers >99% data reliability
Operating Temperature
H2S: -40 °F to +122 °F (-40 °C to +50 °C)
O2 Depletion: -22 °F to +122 °F (-30 °C to +50 °C)
CO: -22 °F to +122 °F (-30 °C to +50 °C)
O2 Depletion: -22 °F to +122 °F (-30 °C to +50 °C)
CO: -22 °F to +122 °F (-30 °C to +50 °C)
Update Rate
1 second to 60 minutes, user selectable
Time Constant / Response
H2S:
- T20 < 8 seconds
- T50 < 10 seconds
- T90 < 45 seconds
- T90 < 15 seconds
The Rosemount 925FGD Gas Detector uses non-dispersive infrared (IR) technology and provides early combustible gas leak detection within your processes. As the first Rosemount designed and engineered fixed gas detector, it offers industry-leading features and performance specifications for a wide variety of combustible gas detection needs. The fixed gas detector utilizes the Rosemount 625 Gas Sensor and is approved to the latest hazardous area and performance standards for worldwide use.
- Gas transmitter can be fitted with a wide range of combustible gas sensors and recognizes a newly fitted gas sensor, automatically uploading the gas sensor’s specific configuration profile
- Gas sensor and transmitter continuously communicate digitally, providing stable, accurate protection with fast response times even over long separation distances
- Rosemount 925FGD gas detector offers best-in-class performance specifications for combustible gases including accuracy, response time, operating temperature ranges, and zero drift specification
Operating Temperature
-40 to +158 °F (-40 to +70 °C)
-67 to +158 °F (-55 to +70 °C) with heater on
-67 to +158 °F (-55 to +70 °C) with heater on
Measurement Type
Gas concentration levels: Hydrocarbon gases: 0-100% LEL
Sensor Type
Rosemount 625 Non-Dispersive Infrared Sensor
The Rosemount Incus Ultrasonic Gas Leak Detector utilizes four ultra-sensitive acoustic sensors that constantly monitor wide areas for ultrasound generated from the release of pressurized gas. Ideally suited for monitoring well-ventilated outdoor environments, the ultrasonic gas leak detector has been engineered to withstand the most extreme conditions and is unaffected by inclement weather, wind, leak direction, and gas dilution or stratification.
- Instantaneous response to all gas leaks (toxic gases, combustible gases or inert gases)
- No calibration required
- Quad sensing heads provide the widest overall gas detection range available on the market: 2 to 40 meters (7 to 130 feet)
Mounting
AISI 316 Stainless Steel (included)
Power Supply
15 - 30 Vdc (24Vdc)
6 W - standard operation
6 W - standard operation
Certifications/Approvals
IECEx ITS 10.0004X
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
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
The Rosemount 935 Open Path Combustible Gas Detector provides continuous monitoring for hydrocarbon gases, even in harsh environments where dust, fog, rain, snow or vibration can cause high amounts of obscuration. This combustible gas detector utilizes infrared technology and has long range detection up to 660 ft (200 m). Worldwide approvals for the Rosemount 935 Open Path Combustible Gas Detector include ATEX, IECEx, FM/FMC, INMETRO, TR CU, and SIL 2 (TÜV).
- Accurate, high speed response time (< 3 seconds)
- High immunity to false alarms
- Heated optics for use in extreme environments
Time Constant / Response
T90≤ 3 Seconds
Sensitivity Range
0-5 LEL.m methane and propane
0-8 LEL.m ethylene
0-8 LEL.m ethylene
Spectral Response
2.0 - 3.0μm
The Rosemount 936 Open Path Toxic Gas Detector provides continuous monitoring for hydrogen sulfide (H
2S) gas or ammonia (NH
3) gas, even in harsh environments where dust, fog, rain, snow or vibration can cause a high reduction of signal. This toxic gas detector utilizes ultraviolet technology and has long range detection up to 200 ft (60 m). Worldwide approvals for the Rosemount 936 Open Path Toxic Gas Detector include ATEX, IECEx, FM/FMC, INMETRO, TR CU, and SIL 2 (TÜV).
- High immunity to false alarms
- Heated optics for use in extreme environments
- Built-in data logger (records up to 100 events)
Time Constant / Response
T90 ≤ 3 Seconds
Sensitivity Range
0-500 ppm.m
Spectral Response
200-300nm
