WR-Model 909 Hot/Wet Single Gas Mass Flow CEM

		Model 909 Hot/Wet Single Gas Mass Flow CEM

THE NEED
A number of governmental air pollution regulations restrict the allowable stack emissions from various industrial facilities. Often, a facility will need to measure and report the emissions of a single pollutant being emitted by their process. Under many compliance regulations, it is not adequate to simply know the concentration of pollutants in the stack gas emissions. Often, a facility is required to monitor and report the mass emissions (e.g. lb/hr, kgs/day, etc.) of their processes.
In order to accurately monitor mass emissions, an analyzer must be capable of accurately and reliably measuring the pollutant of interest while simultaneously measuring the stack gas velocity. This feat is made all the more difficult as the stack gas is typically hot, saturated with moisture, and dirty.

THE SOLUTION
The AMETEK Western Research Model 909 is a single gas version of our Model 910 Continuous Emissions Monitor. The Model 909 is specifically configured for monitoring stack emissions on a mass rate basis. It measures stack effluent temperature and velocity in addition to pollutant concentration at stack conditions, enabling mass emission rates to be reported. With the addition of an optional zirconium oxide sensor, the Model 909 is capable of monitoring oxygen.

The Model 909 is a very robust and reliable analyzer. Its no-moving-parts, UV-based measurements do not suffer from H₂O and CO₂ interference. This greatly simplifies sample handling and sample integrity as there is no need for sample drying. As a fully extractive, heated wet basis analyzer, the 909's sample system components are simply heated above the dew point of the sample gas. This results in a simpler and more accurate calculation of gas concentrations, requiring no corrections for condensed and dissolved components.

The Model 909 performs all necessary sample gas and calibration gas flow management, and probe and sample line temperature control. The Model 909 is a full function Continuous Emissions Monitoring System (CEM) which requires the addition of only a sample probe and sample line to be fully operational. Housing options for the analyzer include a cabinet or walk in shelter built to your specifications.

KEY FEATURES

High reliability and reduced maintenance requirements through a no-moving-parts-design
Hot/wet analysis prevents errors associated with:
- Correcting for water vapor
- Absorption losses in driers
- Accuracy better than 2.5 ppm SO₂
- Able to measure SO₂, NO, NO₂, H₂S, NH₃ or a number of other chemicals
- No H₂O or CO₂ interference
- Automated zero and span gas calibration
- Provides serial interface with plant DCS
- Incorporates flow measurement for emission rate calculations.

APPLICATIONS

Sulfur Plants
Smelters
Power Plants
Industrial Boilers and Process Heaters

Specifications
Methodology: Dual beam, high resolution, nondispersive UV
Species Measurable	Minimum Full Scale†	Maximum Full Scale
SO₂	250 ppm	100%
NO	300 ppm	100%
NO₂	300 ppm	100%
H₂S	500 ppm	100%
NH₃	125 ppm	100%
Cl₂	500 ppm	100%
† Minimum full scale is based on +1% full scale accuracy over 24 hours with auto zero disabled.

Optional O₂:	Integral zirconium oxide
Accuracy:	Better than ±1% full scale of standard ranges
Repeatability:	Better than ±0.5% full scale of standard ranges
Linearity:	Better than ±1% of reading
Response Time:	Typically less than 30 s to T90 (excludes sample system)
Sample Transport:	Air aspiration
Typical Sample Flow:	3 to 5 L/min (0.1 to 0.2 CFM)
Temperature Control:	Independent control of three zones (oven, sample line, probe)
Pressure and Temperature Compensation:	Standard
Ambient Temperature*:	5° to 50°C (41° to 122°F)
Instrument Air:	Minimum 413.6 KPa (60 psig), 120 L/min (4.24 CFM), instrument quality air
Power:	120 VAC °±10%, 47 to 63 Hz or 240 VAC ±10%, 47 to 63 Hz, 600 W for analyzer only
Communications
Analog:	4 x 4 to 20 mA self powered
Digital:	One RS232 port for service diagnostics One RS422 with Modbus protocol
Relays:	3 independent sets of SPDT relays alarm conditions
Physical Dimensions HxWxD:	1553.6 x 1117.6 x 306 mm (61.17 x 44 x 12 in.)
Weight:	Estimated minimum 160 kg (350 lbs.)
Approvals and Certifications:	NEC/CEC Class I, Division 2, Groups C & D ATEX II 2G EEx pd IIB T3 Russian Ex Proof Certification; 1ExpydIIBT3 Russian Gosstandart Pattern Approval Complies with all relevant European Directives

* Temperature drift is approximately 1 ppm/°C for the species listed. To achieve maximum accuracy and stability, the analyzer should be installed in a temperature-controlled environment or be zeroed more frequently.