Model 910 Hot/Wet Multi Gas Mass Flow CEM

The AMETEK Process Instruments Model 910 is specifically configured for monitoring the stack emissions of multiple pollutants on a mass rate basis.


he AMETEK Process Instruments Model 910 is specifically configured for monitoring the stack emissions of multiple pollutants on a mass rate basis. It measures stack effluent temperature and velocity in addition to as many as five pollutant concentrations at stack conditions, enabling each pollutant’s mass emission rate to be reported. With the addition of an optional zirconium oxide sensor, the Model 910 is capable of monitoring oxygen.

The Model 910 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 910’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 910 performs all necessary sample gas and calibration gas flow management, and probe and sample line temperature control. The Model 910 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.


  • Hot/wet analysis prevents errors associated with:
  • Correcting for 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 measurement
  • No H2O or CO2 interference
  • Automated zero and span gas calibration
  • Serial interface with plant DCS
  • Incorporates flow measurement for emission rate calculations


  • Sulfur Plants
  • Smelters
  • Power Plants
  • Industrial Boilers
  • Process Heater
Methodology:Multiple wavelength, high resolution, non-dispersive UV
Species Measured Minimum Full Scale (see Note) Maximum Full Scale
SO2 250 ppm 100%
NO 300ppm 100%
NO2 300ppm 100%
NOx 300 ppm 100%
H2S 500 ppm 100%
NH3 500ppm 100%
Note: 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
Repeatability Better than ±0.5% full scale
Linearity Better than ±1% full scale
Response Time Typically less than 30 s to T90 (excl. sample system)
Number of Gases Up to 5 simultaneously (refer to AMETEK for possible combinations)
Sample Transport Air aspiration
Sample Gas Temperature Ambient to 150°C (302°F)
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 Temperature2 5° to 50°C (41° to 122°F)
Instrument Air Minimum 413.6KPa (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
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 1555.3 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
Russian Ex Proof Certification; 1ExpydIIBT3
Russian Gosstandard Pattern Approval
Complies with all relevant European Directives
1. Accuracy may vary on some applications where multi-species 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.


Model 910 Hot/Wet Multi-Gas CEM
Heated Acid Gas (HAG) Sampling Probe