Model 909 Hot/Wet Single Gas Mass Flow CEM

Model 909 Hot/Wet Single Gas Mass Flow CEM
Overview

Due to compliance regulations, it is not adequate to simply know the concentration of pollutants in the stack gas emissions. A facility is required to monitor and report the mass emissions (e.g. lb/hr, kgs/day, etc.) of their processes.

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.

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.
  • Specifications +


    Methodology: Dual beam, high resolution, nondispersive UV
    Species Measurable Minimum Full Scale† Maximum Full Scale
    SO2 250 ppm 100%
    NO 300ppm 100%
    NO2 300ppm 100%
    H2S 500 ppm 100%
    NH3 125ppm 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 full scale
    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.
  • Documents +

  • 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
  • Appliations +


    • Sulfur Plants
    • Smelters
    • Power Plants
    • Industrial Boilers and Process Heaters