WR-Model 920 Hot/Wet Multi Gas CEM

		Model 920 Hot/Wet Multi Gas 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 concentrations of multiple pollutants being emitted by their process. In order to accurately monitor these pollutants, an analyzer must be capable of accurately and reliably measuring the various pollutants of interest. 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 920 is specifically configured for monitoring the stack emissions of multiple pollutants on a concentration basis. It measures as many as five pollutants at stack conditions. With the addition of an optional zirconium oxide sensor, the Model 920 is capable of monitoring oxygen.

The Model 920 is a very robust and reliable analyzer. Its UV-based measurements do not suffer from H₂O and CO₂ interference. They can also have a wide dynamic range for some measurements. 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 920'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 920 performs all necessary sample gas and calibration gas flow management, and probe and sample line temperature control. The Model 920 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

Hot/wet analysis prevents errors associated with water vapor, and absorption losses in driers
Able to measure up to five of the following species: SO₂, NO, NO₂, H₂S, NH₃ or a number of other chemicals
Multi-range SO₂ analysis possible
H₂O or CO₂ interference
Automated zero and span gas calibration
Provides serial interface with plant DCS

APPLICATIONS

Sulfur Plants
Smelters
Power Plants
Industrial Boilers
Process Heaters

Other Product of Interest:

Model 919 Hot/Wet Single Gas Analyzer

Specifications
Methodology: Multiple wavelength, high resolution, non-dispersive UV
Species Measured	Minimum Full Scale (see Note)	Maximum Full Scale
SO₂	250 ppm	100%
NO	300 ppm	100%
NO₂	300 ppm	100%
NO_x	300 ppm	100%
H₂S	500 ppm	100%
NH₃	125 ppm	100%
Cl₂	500 ppm	100%
COS	1000 ppm	100%
CS₂	2500 ppm	100%


Optional O₂:	Integral Zirconium Oxide
Accuracy:	Better than 1% full scale
Repeatability:	Better than 0.5% full scale
Linearity:	Better than 1% full scale
Response Time:	Typically less than 30s to T90 (excludes sample system)
Number of Gases:	Up to 5 simultaneously (refer to AMETEK for possible combinations)
Sample Transport:	Air aspiration
Typical Sample Flow:	3 to 5 L/min (0.1 to 0.2 CFM)
Sample Gas Temperature:	Ambient to 150°C (302°F)
Temperature Control:	Independent control of three zones (oven, sample line, probe)
Pressure and Temperature Compensation:	Standard
Ambient Temperature²:	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%, 47-63 Hz or 220 VAC ±10%, 47-63 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:	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 Gosstandard Pattern Approval Complies with all relevant European Directives

1. Accuracy may vary on some applications where multispecies measurement is required.
2. Temperature drift is approximately 1 ppm/°C for the species listed. To achieve maximum accuracy and stability, you can either install the analyzer in a temperature-controlled environment or zero the analyzer more frequently.