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APPLICATIONS For continuous dew point analysis of heat-treating atmospheres, hydrogen/ nitrogen atmospheres, instrument air lines, etc. FEATURES ⢠Low range of -148° to + 68° F ( or -100° to 20° C) dew point ⢠Rugged design that is easy to operate ⢠Use on any non-corrosive industrial gases and air ⢠Long-life dielectric ceramic sensor ⢠Can be calibrated in the field ⢠Bright digital readout ⢠Built in sample pump or pressure regulator, filter, and oil absorber ⢠4-20mA output OPTIONS ⢠High or low dew point alarm with LED on panel ⢠0-1VDC or isolated 4-20mA recorder outputs ⢠RS232, RS485, MODBUS, & Ethernet outputs ⢠Corrosion resistant wall mount enclosure CALIBRATION ⢠On analyzed dry N2 for zero ⢠On known, current ambient air dew point for span ⢠Alternatively, it can be returned to Nova for a certified calibration DESCRIPTION The Nova 253 Series Continuous Analyzers for Low Range Dew Point have been designed primarily for accurate dew point analysis of heat treating atmospheres, instrument air, or other applications which may have typical dew points that are lower than what can be read by standard dew point analyzers, such as the Nova 252 Series. The dielectric ceramic sensor provides stable and accurate measurements and is not affected by most gas compositions, oil vapors, or particulates in the sample. A special built-in absorption filter removes oily vapors when sampling furnace gases. A built in sample pump draws in samples that are of insufficient pressure from the process. Alternatively, a regulator can be supplied where the sample gas is under pressure. The sample flow is shown on a small rotameter with valve. The analyzer then reads the dew point continuously and displays it on a bright digital display. MODELS ⢠253N12 - Wall mounted NEMA 12 ( IP52) ⢠253N4 - Wall mounted NEMA 4 ( IP65) ⢠253PM - Panel mounted ( includes 3ft ( 91 cm) braided sample line) ⢠253RM - 19" ( 483 mm) rack mounted ( includes 3ft ( 91 cm) braided SPECIFICATIONS Method of Detection: Dielectric ceramic sensor that changes capacitance with moisture variation Ranges Available: -148 to + 68° F ( or -100 to + 20° C) , other ranges available on special order Resolution: 1° F Dew Point ( 1° C) Accuracy and Repeatability: ± 1° F Dew Point from 0 to 68° F; ± 2° F Dew Point from -148 to 0° F ± 1° C Dew Point from -17 to 20° C; ± 2° C Dew Point from -100 to -17° C Response Time ( T-90) : Less than 60 seconds to T90 at higher dew points Lower dew points may take an hour or more to dry down from ambient air Ambient Temperature Range: 0° to 120° F ( -18° to 49° C) Linearity: ± 1° F Dew Point from 0 to 68° F; ± 2° F Dew Point from -148 to 0° F ± 1° C Dew Point from -17 to 20° C; ± 2° C Dew Point from -100 to -17° C Size and Weight: N12 style - approx. 12" W x 14" H x 8" D @ 10 lbs ( 25 x 30 x 15 cm @ 4.5 kg) N4 style - approx. 12" W x 14" H x 8" D @ 10 lbs ( 25 x 30 x 15 cm @ 4.5 kg) PM style - approx. 17" W x 5.5" H x 14" D @ 8 lbs ( 42.5 x 14 x 35 cm @ 3.6 kg) RM style - approx. 19" W x 5.5" H x 14" D @ 15 lbs ( 35 x 15 x 26 cm @ 6.8 kg) Power: 115VAC 60 Hz for recharging ( 230VAC 50 HZ also available)