![]() 3 1/2 DIGIT (Pt 100) RTD METERS MODEL 202A-M, -R
OPTIONS ![]() ![]() Models 202A-M and -R are low-cost 3 1/2 digit (±1,999 count) temperature indicators for use with platinum 100 ohm RTD's with alpha of 0.00385. They are complete with 1 mA sensor excitation, sensor-break detection, and platinum curve linearization. Resolution is 1° (-M) or 0.1° (-R). Readout can be in °C or °F, as selected by push-on jumpers. The electrical connection can be by 2, 3 or 4 wires. High accuracy is provided by positive current feedback and matched, graded components. STANDARD FEATURES Mechanical features include a bright 0.56 in (14.2 mm) display, a screw-terminal barrier strip for signal and power, and a compact 1/8 DIN case that requires less than 4.1 in (104 mm) behind the panel. Electrical features include jumper selection of °C or °F, a linearized recorder output of 1 or 10 mV per degree, and 1 mA current excitation. The current source is tied to the reference of the A/D converter for true ratiometric operation and immunity to changes in line voltage. OPTIONS Options are isolated 9-32 Vdc or 26-56 Vdc power, a PCB edge connector for display control and output of +4.7 Vdc and 4.7 Vdc power, and a splash-proof lens cover which meets NEMA-4 requirements. SPECIFICATIONS INPUT RTD type: 100- platinum with alpha of 0.00385 Calibration: IEC 751 (IPTS-68) Configuration: 2-, 3- or 4- wire connection Polarity: Bipolar Zero: Adjustable ± 20°C (±36°F) Zero tempco: ±0.05 degree/degree (-M) ,±0.01 degree/degree (-R) Sensor-wire resistance tempco effect per conductor: 2-wire: 20 mdeg/ ohm /deg, up to 3.8 ohm 3-wire: 50 µdeg/ ohm /deg, up to 100 ohm 4-wire: 5.0 µdeg/ ohm /deg, up to 100 ohm Sensor-excitation current: 1 mA Sensor-break indication: Meter displays overrange Overvoltage protection: 25 Vp NOISE REJECTION NMR, SIG HI to SIG LO: 70 dB, 50/60 Hz CMR, ANA GND to POWER GND: 120 dB DC to 60 Hz CMV, ANA GND to ANA GND: 1500 Vp per HV test, 354 Vp per IEC spacing ACCURACY AT 25°C Celsius/Fahrenheit: Jumper-selectable Full-scale step response: 1 s Warmup to rated accuracy: 10 min ANALOG OUTPUT (Linearized) Voltage: 1 mV/deg (-M); 10 mV/deg (-R) Calibration error: Same as given under accuracy Current: 1 mA maximum Source resistance: 68 ohm ANALOG-TO-DIGITAL CONVERSION Technique: Dual-slope, average value Signal integration period: 100 ms Read rate: 2.5/s DISPLAY Type: 7-segment, red LED Height: 0.56 in (14.2 mm) Symbols: 1.8.8.8 Decimal points: XXXX (-M); XXX.X (-R) Overrange indication: Three least-significant digits blank DIGITAL INPUTS Level: TTL or 5 V CMOS compatible POWER AC voltages: 115 or 230 Vac, ±15% AC frequency: 49 to 440 Hz DC voltages: 9-32 Vdc, isolated to 300 Vp; 26-56 Vdc, isolated to 300 Vp Power consumption: 3.7 W Output voltages: +4.7 Vdc and 4.7 Vdc ±5%, 10 mA max ENVIRONMENTAL Operating temperature: 0 to 60°C Storage temperature: 40 to +85°C Relative humidity: 95% at 40°C (non-condensing) MECHANICAL Dimensions: Newport DIN2A (short 1/8 DIN) case (see Mechanical section for drawings) Weight: 15 oz (425 g) Case material: 94V-0 UL-rated polycarbonate HOME / PRODUCT GUIDE / TECHNICAL REFERENCE NEWPORT Electronics, Inc. (714) 540-4914 or Contact Us Copyright 1998, Newport Electronics, Inc. All rights reserved. |