Canada
270 Sherman Avenue N.
Hamilton, ON L8L 6N5
Phone: (905) 545 2003• Fax: (905) 545 4248 |
United States
1925 Pine Avenue
Niagara Falls, NY 14301
Phone: (716) 285-0418 • Fax: (716) 282-2937 |
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Email: sales@nova-gas.com or websales@nova-gas.com
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Item # 425 Series, Continuous Process Analyzer for Binary Gas Mixtures by Thermal Conductivity
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The Nova 425 Thermal conductivity (TC) Analyzer has many applications in industry where the measurement of one gas in a two gas or some multi-gas mixtures is required. The Nova TC cell is temperature controlled and its high stability enables it to be used even in high purity measurements. Since the TC cell does not consume the sample, have any moving parts, hot wires, or sealed chemicals, it will last for many years.
In operation, the TC cell detects the rate at which the sample gas conducts heat away from a Resistance Temperature Device (RTD) with reference to a similar RTD surrounded by air (or other reference gas). A sample gas containing the gas to be measured will cause the temperature, and its resistance, to change with respect to the reference RTD. This will cause an output from the Wheatstone bridge measuring circuit which is calibrated and displayed on a digital meter.
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Method of Detection
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CH4 in N2, air, or CO2; SF6 in CO2, etc.
CO2 in N2, H2, air, Ar, O2, He, etc
O2 in Ar, CO2, He, H2, etc
RTD-based TC cell can be used to measure almost any binary gas mixture such as H2 in N2, O2, air, SO2, Ar, He, NH3, etc
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Ranges Available
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0-2% to 0-100% and suppressed ranges such as 95-100%
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Resolution
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0.1% of gas to be measured
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Accuracy & Repeatability
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±1% of full scale
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Drift
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Less than 1% of full scale per month
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Response Time (T-90)
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10-15 seconds to 90% step change
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Ambient Temperature Range
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32 to 122°F (0 to 50°C), Lower temperatures (-5°F, -20°C) with Cold Weather Package
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Linearity
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±1% of full scale
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Size & Weight
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Dimensions will vary depending on enclosure style and options required
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Power
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115 VAC, 60 Hz
220 VAC, 50 Hz
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Output Options
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4-20 mA into 500 ohms non-isolated standard
Isolated 4-20 mA, RS232, RS485, MODBUS, Ethernet outputs
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Alarms
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High and/or Low alarm contacts available, relay contacts SPDT 5A @ 220 VAC rating
Low flow alarm
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Unique Applications
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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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Primary Gas to be Measured
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Ammonia (NH3)
Argon
Carbon Dioxide (CO2)
Helium (He)
Hydrogen (H2)
Methane (CH4)
Nitrogen (N2)
Oxygen (O2)
Sulfur Dioxide (SO2)
Sulfur Hexaflouride (SF6)
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Industry Type
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Online Process Analysis
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Mounting Options
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Panel mounted
Rack mounted
Wall mounted
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Models and Enclosure Options
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NEMA12 (IP52)
NEMA4 (IP65)
NEMA4X (IP65)
NEMA7
NEMA7 UL/CSA
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