美国OMEGA欧米茄DPF301_DPF302_-NEMA_EXP回路4-20mA供电指示器-上海亨东仪器有限公司

Available with Dual Rate/Total, Display
Linear or Square Root Extraction of Input
8-Digit Totalizer Display
Calibration Fully Programmable Through Keypad

The DPF301 Series comprises4 to 20 mA loop-powered panel-mountindicators that display processvariables in engineering units(GPM, LPM, psig, %RH, etc.), withan adjustable decimal point for rateａnd total display. Because theseindicators take power directly fromthe current loop, the user canperform programming on the frontkeypad; there are no jumpers toconfigure or potentiometers to scale.An internal lithium battery ensuresthat all programming is retained inmemory, even when the loop poweris disconnected. The DPF301 canbe programmed for either a linearinput or square root extraction foruse with differential pressureflowmeters.

The DPF301 general purposeindicator features one 41.2 digit ratedisplay, while the DPF302 flowindicator has a dual, 2-line, 4½ digitrate display and 8-digit totalizer. Thetotalizer can be reset from either thefront keypad or remotely via acontact closure.

The DPF300 Series indicatorsare available in a choice ofpanel-mount, NEMA 4X (IP66), orexplosion-resistant enclosures.

SPECIFICATIONS
Scalable Input Range: 3.8 to 21 mA Internal Battery (Memory Only): 3V 250 mAh lithium (2-year standby life) Rate Display (DPF301 and DPF302): 41.2 digits max (19999), 8.89 mm (0.35") high Totalizer Display (DPF302 Only): 8 Digits (), 5.08 mm (0.2") high
Rate Descriptors: /sec, /min, /hr or "blank"
Unit Descriptors: Gal, Lit, FT3, M3, "blank"
Display Indications: Low battery and under/over range
Input: 4 to 20 mA DC, overcurrent protection to 60 mA, reverse polarity protected
Loop Voltage Drop: 6V max Housing
Standard: Round panel mount with NEMA 4X (IP66) sealed keypad membrane
Optional: Glass-filled polycarbonate NEMA 4X (IP66) enclosure, or explosion-resistant housing for NEMA 7, NEMA 4 (IP66), Class I, Groups B, C and D; Class II, Groups E, F and G
Ambient Temperature: -20 to 70°C (-4 to 158°F)
Extended Temp Option: -30 to 70°C (-22 to 158°F)
Accuracy (Rated @ 20°C): 0.1% FS resolution, ±1 count
Temperature Drift: 50 ppm/°C typical, 200 ppm/°C worst case
Low Cutoff: A rate below 1% of selected scale (10% of square root scale) will assume the "set lo" value
Update Rate: For rate or total, once every 2 seconds
Weight:
Basic Unit: 227 g (0.5 lb)
With NEMA Enclosure: 454 g (1 lb)
With Explosion-Resistant Housing: 1.6 kg (3.5 lb)