Model 202A-J, -K, -T - 3 1/2 Digit Thermocouple Meters

3 1/2 DIGIT THERMOCOUPLE METERS
MODEL 202A-J, -K, -T

1/8 DIN (2A) Case

Connections Diagram

STANDARD FEATURES
J, K or T thermocouple input
1° or 0.1° resolution
°C or °F, jumper-selectable
0.05 deg/deg cold-junction error
Five-segment linearization
1 mV/deg linearized recorder output
120 dB CMR, 70 dB NMR
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 V dc power or 26-56 Vdc power
NEMA-4 splash-proof lens cover

Models 202A-J, -K and -T are 3 1/2 digit ±1,999 count) panel meters for thermocouple types J, K and T. They are available for display in °C or °F and resolution of 1° up to 1,999° or 0.1° up to 199.9°. They are recommended for demanding indication-only applications where exceptionally low-cost is required. For display up to 1,999.9° with 0.1° resolution, Newport recommends its 2002A Series meters, which provides a 4 1/2 digit (±19,999 count) main assembly.

STANDARD FEATURES
Newport's 202A Series thermocouple meters provide exceptional accuracy, as made possible by five-segment linearization and use of matched, graded components for each T/C type. Electrical features include cold-junction compen-sation and jumper selection of °C or °F. A 1 mV per count linearized analog output is standard and is ideal for driving a strip-chart recorder.

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.

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 cold-junction compensation, jumper selection of °C or °F, and a linearized recorder output of 1 mV per degree.

OPTIONS
Options are isolated 9-32 V dc or 26-56 V dc power, a PCB edge connector for display control and output of +4.7 Vdc and 4.7 Vdc, and a splash-proof lens cover which meets NEMA-4 requirements.

SPECIFICATIONS

INPUT
Thermocouple: Type J (Iron-Constantan, Fe-CuNi)
Type K (Chromel-Alumel, NiCr-NiAl)
Type T (Copper-Constantan, Cu-CuNi)
Calibration: IEC 584-1 (IPTS-68)
Configuration: Single-ended (-TC lead connected to ANA GND)
Polarity: Bipolar
Zero: Adjustable ±20°C (±36°F)
Cold-junction tempco: ±0.05 deg/deg
Sensor-wire resistance effect per conductor:
Type J: 40 µdeg/deg/ohm, up to 2500 ohm
Type K: 50 µdeg/deg/ohm, up to 2000 ohm
Type T: 50 µdeg/deg/ohm, up to 2000 ohm
Sensor-break current: 300 nA
Sensor-break indication: Meter dispalys positive overrange (upscale)

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 (1° resolution models)
Range for rated accuracy:
Type J: 138 to +760°C (216 to +1400°F)
Type K: 105 to +1248°C (157 to +1999°F)
Type T: 112 to +400 °C (170 to +752°F)
Maximum error: ±1.5°C (±2.7°F) ±1/2 count
Span tempco: ±0.01% of reading/°C
Resolution: 0.1°C or 0.1°F (jumper-selectable)
Full-scale step response: 1 s
Warmup to rated accuracy: 10 min

ACCURACY AT 25°C (0.1° resolution models)
Range for rated accuracy, all T/C types: 105.0 to 199.9°C (157.0 to 199.9°F)
Maximum error: ±1.0°C (±1.8°F) ±1/2 count
Span tempco: ±0.01% of reading/°C
Resolution: 0.1°C or 0.1°F (jumper-selectable)
Full-scale step response: 1 s
Warmup to rated accuracy: 20 min

ANALOG OUTPUT (linearized)
Voltage: 1 mV/count
Calibration error: ±1.5 mV on °C, ±2.7 mV on °F
Current: 1 mA max
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
Overrange indication: Three least-significant digits blank

DIGITAL INPUTS
Level: TTL or 5 V CMOS compatible

POWER
AC voltages: 115 or 230 V ac, ±15%
AC frequency: 49-440 Hz
DC voltages: 9-32 V dc, isolated to 300 Vp; 26-56 V dc, isolated to 300 Vp
Power consumption: 3.7 W
Output voltages: +4.7 V dc and 4.7 V dc ±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