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APPLICATION For continuous carbon dioxide ( CO2) monitoring and control of greenhouses, mushroom farms, controlled atmospheres for produce storage, and others. FEATURES ⢠Bright digital readout ⢠Solid state infrared CO2 detector - no moving parts ⢠Fast warm up - approx. 1 minute ⢠Built in sampling pump ⢠Unaffected by moisture or humidity ⢠Dust-tight fiberglass enclosure ⢠Can be used with Nova auto sequencer for multi-point sampling ⢠Modular layout that is easy to maintain OPTIONS ⢠Hi/ Low gas and low flow alarms available ⢠Cold weather package for low temp use to -5° F ( -20° C) ⢠Relay contacts available for On/ Off CO2 control ⢠4-20mA or 0-1VDC outputs CALIBRATION ⢠Air ( scrubbed of CO2) for zero ⢠Analyzed CO2 cylinder for span DESCRIPTION The Nova 423 Series Carbon Dioxide monitor/ controller has a sensitive solid-state infrared CO2 detector which continuously displays detected CO2 on a front panel digital meter. A built in sample pump draws in a sample through a filter and flow meter then on to the solid state infrared detector for analysis. A 4-20mA linear output signal is available for operation of a recorder or input to a computer. The Model 423 CO2 Monitor can be time shared between a number of sample points using a Nova automatic sequencer. Calibration need only be done once per year. Applications include HVAC and IAQ systems, CO2 monitoring and control of greenhouses, wineries, breweries, food processing plants or any area requiring a stand-alone CO2 monitor or controller. MODELS Other models available : ⢠423C - Control or alarm relay contacts allow on-off control of a CO2 burner or CO2 addition system ⢠423A - The above mentioned contacts may be used for alarms in process applications. Relays for both models adjustable from 0-100% span; adjustable dead band; contact rating 5A @ 230VAC SPDT SPECIFICATIONS Method of Detection : Solids State NDIR infrared detector with no free air path Ranges Available : 0-2000, 0-3000, 0-5000, 0-10, 000, 0-20, 000 PPM CO2 Resolution : 10 PPM Accuracy and Repeatability : ± 2% of full scale Drift : less than 100 PPM per month non-accumulative Response Time ( T-90) : 20-30 seconds Ambient Temperature Range 32° to 122° F ( 0° to 49° C) Linearity : 1% of full scale Size and Weight : 10â H x 8â W x 5â D ( 25 x 20 x 13 cm) , 6lbs. ( 2.7kg) Power : 115VAC 60 Hz or 220VAC, 50 Hz Output Options : 4-20mA, 0-1VAC, RS232 Alarms : Non latching control relay with set point