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Item # 425 Series, Continuous Process Analyzer for Binary Gas Mixtures by Thermal Conductivity


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.




 Specifications   Applications   Features   Options   Calibration   

Method of Detection
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

Ranges Available
0-2% to 0-100% and suppressed ranges such as 95-100%

Resolution
0.1% of gas to be measured

Accuracy & Repeatability
±1% of full scale

Drift
Less than 1% of full scale per month

Response Time (T-90)
10-15 seconds to 90% step change

Ambient Temperature Range
32 to 122°F (0 to 50°C), Lower temperatures (-5°F, -20°C) with Cold Weather Package

Linearity
±1% of full scale

Size & Weight
Dimensions will vary depending on enclosure style and options required

Power
115 VAC, 60 Hz
220 VAC, 50 Hz

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
Low flow alarm

Unique Applications
    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.

Primary Gas to be Measured
Ammonia (NH3)
Argon
Carbon Dioxide (CO2)
Helium (He)
Hydrogen (H2)
Methane (CH4)
Nitrogen (N2)
Oxygen (O2)
Sulfur Dioxide (SO2)
Sulfur Hexaflouride (SF6)

Industry Type
Online Process Analysis

Mounting Options
Panel mounted
Rack mounted
Wall mounted

Models and Enclosure Options
NEMA12 (IP52)
NEMA4 (IP65)
NEMA4X (IP65)
NEMA7
NEMA7 UL/CSA


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·  Application process