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Keterangan

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.

Specifications
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

Applications
For continuous analysis of many binary gas mixtures comprised of H2, CO2, O2, CH4, SO2, Ar, He, NH3, SF6, air, and others. Applications include heat treating atmospheres, welding gas mixtures, blanketing gas mixtures, ammonia synthesis, leak detection, purge monitoring, flue gas, magnesium blanketing by SF6 and others.

Features
Bright digital readout
Lower cost than infrared, GC or mass spectrometer
High stability, microprocessor-controlled, long-life thermal conductivity ( TC) cell
Easy-to-maintain modular layout
Built in sample pump or pressure regulator
4-20 mA outputs
Sensors mounted in temperature controlled heated box to improve accuracy

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 calibration 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

Calibration
Air or nitrogen for zero
Analyzed calibration gas for span