Gas Detection
17 Gas Flow Meter Provides Accurate Measurement for Landfill Gas Operations
With the GF90 Mass Flow Meter from Fluid Components International (USA), landfill gas recovery operators can now accurately measure and control mixed composition greenhouse gases while at the same time generate electric power with co-generation technology and meet environmental regulatory reporting requirements. Landfills produce a mixture of methane (CH4
) and carbon dioxide (CO2
with multiple wellheads and collected via a network of pipes with a common header pipe, which feeds gas to turbines that produce clean electric power. Typical systems include turbines, compressors, blowers, pumps, flow meters, knock-out pots and a flare or oxidiser gas system. Accurate landfill gas flow measurement is essential to provide operators with system-wide information on the amount of gas being extracted and utilised for electric power generation and/or disposed of via the flare or gas oxidizer system. The plant operators report the gas flow data to environmental agencies for pollution regulatory purposes and for carbon credit programs.
The highly intelligent GF90 Landfill Gas Flow Meter provides precise gas flow measurement in challenging landfill operating environments. Landfill operations generate mixed hydrocarbon composition gases, which are also often wet and dirty as well as potentially explosive. Wide swings in gas flow rates occur due to seasonal temperature swings, which require low flow sensitivity and the ability to withstand sudden large increases in system gas throughput. The GF90 Flow Meter delivers high accuracy measurement over a wide range, including low flows. It is designed with a thermal mass gas flow sensing element of 316 stainless steel and nickel-braze construction. Featuring constant power technology, the GF90 can achieve turndowns from 1000:1, accuracy of +1 percent of reading plus 0.5 percent of scale, with repeatability of +0.5 percent of reading or better.
The GF90’s wide flow range is suitable for air/gas flows from 0.25 to 1600 SFPS (ft/sec at a standard temperature of 70ºF and pressure of 14.7 psia) or 0.08 to 487.7 NMPS (m/sec at a normal temperature of 21.1ºC and pressure of 1.013 bar absolute). It is available for service in broad range of fluid temperature applications, from -100 to 850ºF (-73 to 454ºC) and pressure applications to 1000 psig [69 bar (g)].
Designed for multi-gas or variable flow processes, the intelligent GF90 Flow Meter includes an advanced microprocessor-based programmable transmitter. The transmitter can store up to three calibration groups. Each group can be independently configured for a specific calibration range, fluid, switch point settings, etc., to provide accuracy in complicated processes. The instrument is also inherently multi-variable.
The GF90’s transmitter electronics are addressable via a built-in LCD display and keypad or through its RS-232C serial port. This allows the user to perform in-field programming to change zero, span, switch points and engineering units, or to perform instrumentation verification, troubleshooting and other critical functions. The serial I/O ports support access to computers or ASCII terminals. The GF90’s transmitter features two independent, field programmable analog signal outputs of 4-20 mA, 0-10 Vdc, 0-5 Vdc, and/or 1-5 Vdc, which can be assigned to any combination of flow and/or temperature. It also offers dual alarm switch points with relay outputs. The switch points are user field-programmable to alarm at high, low or windowed and can also be assigned to flow and/or temperature readings. Dual 10A relay outputs are provided for contact closures to lamps, alarm and control systems.
Reader Reply Card no Maintenance Free Gas Detection
Flexible and easily adjusted to suit the specific requirements of different personal monitoring applications, the Draeger (Germany) X-am gas detection instrument provides accurate, reliable measurement of 1 to 5 gases. Lightweight and as small as a mobile phone, it is completely maintenance free and ensures fast, reliable monitoring of ambient air. Rugged in design and easy to use, this innovative, ATEX approved* instrument also offers extremely low oper- ational costs.
Incorporating the latest miniaturised XXS generation of high performance sensors, the X-am 5000 can be fitted with up to four sensors to detect as many as five gases at once. For example, by using
a catalytic Ex-sensor together with two electrochemical sensors and a combination, double sensor for CO and H2 gases and vapours as well as O2
S, it will provide simultaneous measurement of explosive and other toxic gases.
NO2, PH3
As well as a wide range of sensors to protect against CO, H2 and SO2
S, CO2 , Cl2 , HCN, NH3 , , Draeger oxygen sensors offer a five-year expected lifetime, and
the catalytic Ex sensor, calibrated to methane, offers exceptional longevity. Providing improved safety when facing unknown hazards, this Ex sensor responds quickly to explosive gases (additional calibrations are available) and offers a high level of sensitivity to combustible organic vapours. As a result, it ensures dependable warnings in the event of explosive hazards.
Designed for intuitive operation and featuring a practical two-key control panel and straightforward menu guidance system, the X-am 5000 features three different alarms. The audible multi-tone alarm is impossible to miss, whilst a visual 180-degree alarm helps to ensure that the warning is not ignored, as does the built-in vibrational alarm.
Reader Reply Card no 56
Chlorine IT Toxic Gas Sensor Module
The 5100-06-IT from Sierra Monitor (USA) is the only Chlorine Gas Sensor with a 6 month (180 day) calibration cycle. This cuts maintenance costs in half when compared to the standard 90- day calibration interval common in the industry.
IT Series Hazardous Gas Detectors allow system integrators and instrumentation engineers to interface these proven gas sensors into their plant-wide safety and monitoring systems. Integration to existing systems is easy as the IT Series are loaded with 4-20 mA output, RS-485 Modbus interface, SentryBus interface, optional integral relay output and digital display! Non-intrusive calibration, remote sensor option and 316 Stainless Steel enclosure options are available on the 5100-06-IT Chlorine Gas Sensor Module.
The 5100-06-IT Chlorine Gas Sensor Module is a stand-alone module loaded with the features required to provide the due
diligence expected in hazardous areas. Reader Reply Card no 277 Reader Reply Card no 57
55 ) with traces of nitrogen, oxygen and other gases. These gases are extracted from the landfill
Annual Buyers Guide 2009
IET
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