Specification
APPLICATIONS
For continuous monitoring of any combination of heat treat atmosphere gases such as oxygen ( O2) , methane ( CH4) , carbondioxide ( 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 infra-red 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
DESCRIPTION
The Nova 7900 Series Heat Treat Analyzer System utilizes high stability infrared detectors for the simultaneous
measurement of CO, CO2, and CH4. In addition, the analyzer can also be supplied with a non-consumable, long
life thermal conductivity cell for hydrogen that is compensated for the interference effects of CO, CO2, and CH4.
This ensures that hydrogen will always read correctly regardless of the background gas composition. A long life
eletrochemical senser is used for PPM or % O2 analysis. In most cases, sensors are installed in a temperature
controlled box to improve reading accuracy. All detected gases have a separate digital readout and linear recorder output. Various versions available for either exothermic or endothermic mixtures, or for other industrial process gases.
ENCLOSURES
Four types of enclosure available. See next page for gas analysis combinations and model numbers
⢠7900N4 - Wall mounted NEMA4 ( IP65) enclosure rating
⢠7900N4X - Wall mounted corrosion-resistant NEMA4X ( IP65) enclosure rating
⢠7900N12 - Wall mounted NEMA12 ( IP52) enclosure rating
⢠7900PM - Panel mounted, slides open for easy access
⢠7900RM - 19" ( 483mm) rack mounted, on sliding rails
SPECIFICATIONS
Method of Detection : NDIR infrared detector for CO, CO2, CH4, & NH3; thermal conductivity cell for H2;
Electrochemical sensor for O2; dielectric ceramic sensor for Dew Point
Ranges Available : 0-20.0% , 0-100.0% CO
0-2.00% , 0-100.0% CO2
0-40.0% , 0-100.0% H2
0-10% , 0-100.0% CH4
0-10, 000 PPM, 0-50.0% O2
0-100% NH3
-10° to 80° F( -23° to 26° C) , 48 to 68° F( -100 to 20° C) D.P.
( other ranges available)
Resolution : 0.1% , 1 PPM, 1° F ( Dew Point)
Accuracy and 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 : 32-122° F ( 0-50° C) . Lower temperatures ( -5° F, -20° C) with Cold Weather Package.
Linearity : ± 1% of full scale
Size and Weight : Physical data will vary depending on model and enclosure required
Power : 115VAC 60Hz ( 220VAC 50Hz available)
Output Options : 4-20mA into 500 ohms non-isolated standard Isolated 4-20mA, RS232, RS485, MODBUS, Ethernet outputs optional
Alarms : High and/ or low alarm contacts available, relay contacts SPDT 5A @ 220VAC rating.
Low flow alarm optional
MODELS
Single Gas Analyzers
7901A Carbon Monoxide only ( or as Combustibles = CO x 2)
7901A-T Trace Carbon Monoxide ( 0-2, 000 PPM & up)
7901B Hydrogen only
7901C Combustibles only ( as CO + H2, catalytic type with air make-up)
7901D Methane only
7901E Carbon Dioxide only
Double Gas Analyzers
7902A Carbon Monoxide & Carbon Dioxide
7902B Carbon Monoxide & Hydrogen
7902C Carbon Monoxide & Oxygen
7902D Oxygen & Carbon Dioxide
7902E Oxygen & Hydrogen
7902F Oxygen & Methane
( Hydrogen & Carbon Dioxide - see Nova Model 4230)
3 Gas Analyzers
7903A Carbon Monoxide, Carbon Dioxide, & Methane
7903B Carbon Monoxide, Carbon Dioxide, & Hydrogen
7903C Carbon Monoxide, Carbon Dioxide, & Oxygen
7903D Carbon Monoxide, Methane, & Oxygen
7903E Carbon Monoxide, Hydrogen, & Oxygen
4 Gas Analyzers
7904A Carbon Monoxide, Carbon Dioxide, Methane, & Oxygen
7904B Carbon Monoxide, Carbon Dioxide, Hydrogen, & Oxygen
7904C Carbon Monoxide, Carbon Dioxide, Methane, & Hydrogen
7904D Carbon Monoxide, Methane, Hydrogen, & Oxygen
5 Gas Analyzer
7905A Carbon Monoxide, Carbon Dioxide, Methane, Hydrogen, & Oxygen
Indomonster Priority