Specification
APPLICATIONS
For continuous analysis of hydrogen ( H2) with active carbondioxide ( CO2) compensation. Recommended for continuous analysis of exothermic ( DX) atmosphere gases from a generator
or a furnace, and other process gases.
FEATURES
⢠High accuracy - continuous CO2 compensation of H2 reading
⢠Bright digital readout, and voltage or 4 - 20 mA outputs
⢠Long life thermal conductivity ( TC) detector with high accuracy and
repeatability, cannot be burned out from loss of flow
⢠Separate NDIR CO2 detector
⢠Easy-to-maintain modular layout
⢠Built in sample pump, filters, and flowmeter
OPTIONS
⢠Hi/ Low H2, CO2, 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
⢠Cabinet coolers can be fitted to most models
⢠Sensors mounted in temperature controlled heated box to improve accuracy
⢠High temperature filters and probes
CALIBRATION
⢠On nitrogen or air for zero
⢠On a blend of 80-90% of full scale range of H2 & CO2 for span
DESCRIPTION
The Nova 4230 Process Hydrogen Analyzer has been specifically designed for the accurate measurement of H2 in exothermic
or ' DX' gas from a furnace, generator, or other processes with high levels of H2 and CO2. The CO2 acts as an interference to the measurement of hydrogen when using a thermalconductivity cell ( T/ C) .
To correct the H2 reading for the presence of CO2, the 4230 has a separate infra red CO2 detector. Its purpose is to provide the exact amount of corrective signal for the hydrogen reading, regardless of the furnace or generator conditions. This is a
most desirable feature, especially when trying to obtain very accurate hydrogen readings.
Some manufacturers attempt to compensate the H2 reading for CO2 by advising the customer to obtain a calibration gas that also contains CO2. This approach is only effective at that particular H2/ CO2 ratio. As soon as the process gas H2 level deviates
from the calibration H2 level, the readings become more inaccurate. Continuous CO2 compensation is the only effective way to deal with this problem.
MODELS
There are seven types of mounting configurations available ( additional models cited below) :
⢠4230N4 - Wall mounted NEMA4 ( IP65) enclosure rating
⢠4230N4X - Wall mounted corrosion-resistant NEMA4X
( IP65) enclosure rating
⢠4230N12 - Wall mounted NEMA12 ( IP52) enclosure rating
⢠4230PM - Panel mounted, slides open for easy access
⢠4230RM - 19" ( 483mm) rack mounted, on sliding rails
⢠4230N7MC: Wall mounted NEMA7 UL/ CSA explosion-proof with non-intrusive magnetic calibration, meets Class 1 Div 1 Group BCD
⢠4230PMN7: Wall mounted NEMA7 sensor housing with panel mounted control cabinet ( two separate enclosures)
Note: High levels of carbon monoxide ( CO) and methane ( CH4) also interfere with H2 analysis. Nova offers the following variants of the 4230 to compensate for each of these gases :
⢠4370 H2 with CH4 compensation
⢠4381 H2 with CO compensation
⢠42381 H2 with CO & CO2 compensation
⢠42387 H2, with CO2, CO, & CH4 compensation.
SPECIFICATIONS
Method of Detection : Temperature-controlled TC cell for H2; separate NDIR detector for CO2
Ranges Available : 0-10.0% to 0-100% H2; and 0-15.0% to 0-100% CO2 ( other ranges available)
Resolution : 0.1% H2 and CO2
Accuracy and Repeatability : ± 1% of full scale
Drift : Zero and span ± 1% of full scale per week
Response Time ( T-90) : 10 - 15 seconds
Ambient Temperature Range : 32-122° F ( 0-50° C) . Lower temperatures ( -5° F, -20° C) with Cold Weather Package.
Linearity : Within 1% of full scale
Size and Weight : Dimensions will vary depending on enclosure style and options 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
Indomonster Priority