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Item # Model 7905A, Continuous Heat Treat Atmosphere and Industrial Process Gas Analyzer, O2, CO, CO2, CH4, H2



The Nova 7900 Series Heat Treat Analyzers are designed for the continuous monitoring of various combinations of gases such as oxygen (O2), methane (CH4), carbon dioxide (CO2), carbon monoxide (CO), and hydrogen (H2) for industrial processes including heat treating atmospheres.

Standard Cabinet: Wall Mounted NEMA4 (IP65) Enclosure Rating

Detection Technologies:
O2 - long-life electrochemical sensor
CO - non-consumable, long-life infrared detector
CO2 - non-consumable, long-life infrared detector
CH4 - non-consumable, long-life infrared hydrocarbons detector
H2 - non-consumable, long-life thermal conductivity cell; available with internal compensation for interference effects from CO, CO2, and CH4

Model 7905A: O2, CO, CO2, CH4 and H2

Note: H2 measurement may be sensitive to interferences from other gases. Full application information required before specifying H2 analyzers.






Specifications  · Applications  · Features  · Options  · Calibration  · Unique Applications

Specifications

Method of Detection

Electrochemical sensor for O2
NDIR infrared detector for CO, CO2, CH4

Thermal conductivity cell for H2

Ranges Available

0 - 2,000 PPM to 0 - 25.0% O2; 0 - 1.00%, 0 - 30.0% CO; 0 - 1.00%, 0 - 50.0% CO2; 0 - 1.00%, 0 - 50.0% CH4; 0 - 2.0%, 0 - 50.0% H2

Resolution

0.1 on percent ranges, 1 PPM on PPM ranges

Accuracy & Repeatability

±1% of full scale on all gases

Drift

Less than 2% of full scale per month

Response Time (T-90)

20-30 seconds to 90% step change

Ambient Temperature Range

40-104 °F (4 to 40°C). Optional -22 to 158 °F (-30 to 70 °C) with Outdoor Packages

Linearity

±1% of full scale

Size & Weight

Physical data will vary depending on model and enclosure required

Power

115 VAC 60 Hz (220 VAC 60 Hz available)

Output Options

4-20 mA into 500 ohms non-isolated standard
Isolated 4-20 mA, RS232, RS485, MODBUS®, Ethernet outputs

Alarms

High and/or low alarm contacts available, relay contacts SPDT 5A @ 220 VAC rating

Analyzer Type

O2, CO, CO2, CH4 and H2 Analyzer

Hazardous Area Rating Options

General Purpose, Non-Hazardous


Applications
    For continuous monitoring of any combination of heat treat atmosphere gases such as Oxygen (O2), Methane (CH4), Carbon Dioxide (CO2), Carbon Monoxide (CO), Hydrogen (H2), Ammonia (NH3), and Dew Point (standard and low ranges). Also available for other industrial process gases.




Features
  • Best value multi-gas analyzer including hydrogen
  • Sensitive infrared detectors for CO, CO2, CH4, and NH3 temperature controlled where necessary to reduce drift
  • Thermal conductivity detector for hydrogen
  • Long life (2-5 years) electrochemical oxygen sensor, PPM and % ranges available
  • Dielectric ceramic sensor for standard or low range dew point
  • Bright digital display for each gas
  • Built in sample pump or pressure regulator
  • Microprocessor for push button calibration
  • Easy to maintain modular layout




Options
  • Hi/Low gas, low flow, and diagnostic alarms available
  • Isolated analog, RS232, RS485, MODBUS, and Ethernet outputs available
  • Sample conditioning systems available for removal of moisture, acidic gas, and dust
  • Cabinet purge system available for use in hazardous areas
  • One-step 'cal-now' button with touch screen LCD display
  • Full automatic calibration with touch screen LCD display
  • Cold weather package for operation to -5°F (-20°C)
  • Cabinet coolers can be fitted to most models
  • High temperature filters and probes
  • Sensors mounted in temperature controlled heated box to improve accuracy




Calibration
  • Ambient air for O2 span and other gases zero
  • Analyzed calibration gas with representative concentrations of non-O2 gases for span




Unique Applications
    Special models of the 7900 Series analyzers can be supplied with options such as free standing cabinets, built-in moisture removal systems, cabinet coolers, controllers, hi/low alarms, low flow alarm, 4-20 mA outputs, recorders, etc. All Nova analyzers are built using proven technologies and techniques. If this product does not suit your application, please contact Nova. In many cases, we are able to build an analyzer specific to your needs.



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·  Application heat treat


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7900 Series Multi-Gas Heat Treat Analyzers
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