Model 2002A-M - 4 1/2 Digit ( Pt 100) RTD Meter

1/8 DIN (2A) Case

Connections Diagram

STANDARD FEATURES
Platinum 100 RTD input
1 mA excitation current
2-, 3- or 4-wire connection
0.1°C or 0.1°F resolution
°C or °F, jumper-selectable
Platinum curve linearization
120 dB CMR, 70 dB NMR
1 mV/deg linearized analog output
Bright, 0.56 in (14.2 mm) LED display
Display hold and test
115/230 Vac power
EMI/RFI filter for AC power
Screw-terminal barrier strip
Short (4.1 in deep) 1/8 DIN case

OPTIONS
Isolated 9-32 Vdc or 26-56 Vdc power
NEMA-4 splash-proof lens cover

Model 2002A-M is a low-cost 4 1/2 digit (±19,999 count) temperature indicator for use with platinum 100 RTD's with alpha of 0.00385. It is complete with 1 mA sensor excitation, sensor-break detection, and platinum curve linearization. Resolution is 0.1°. 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 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
Power options include isolated 9-32 V dc and 26-56 V dc. A splash-proof lens cover which meets NEMA-4 requirements allows the 2002A to be used in harsh industrial environments.

SPECIFICATIONS

ANALOG 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 deg/deg
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 PWR GND: 120 dB, DC to 60 Hz
CMV, ANA GND to PWR GND: 1500 Vp per HV test,354 Vp per IEC spacing.

ACCURACY AT 25°C

MODEL	RANGE	ERROR	RESOLUTION
2002A-MC	-200.0 to +820.0°C	±0.3°C / ±0.2% R	0.1°C
2002B-MF	-328.0 to +1508.0°F	±0.5°F / ±0.2% R	0.1°F

Span tempco: ±0.005% R/°C on all models plus ±0.05°C/°C for -RC from 200 to 130°C
Celsius/Fahrenheit: Jumper-selectable
Full-scale step response: 1 s
Warmup to rated accuracy: 20 min

ANALOG OUTPUT (Linearized)
Voltage: 1 mV/deg
Calibration error: Same as given under accuracy
Current: 1 mA maximum
Source resistance: 68

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: 1.8.8.8.8
Decimal points: Four positions, programmable by jumpers behind lens or at connector
Overrange indication: Four least-significant digits flash

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