3 1/2 Digit Process Meter

LOW-COST, 3 1/2 DIGIT PROCESS METER
MODEL 202A-P

1/8 DIN (2A) Case

Connections Diagram

STANDARD FEATURES
Zero and span adjustments of 2,000 counts each ±1,999-count display span
Standard signal ranges of 4-20 mA, 1-5 V, 0-10 V
120 dB CMR, 56 dB NMR
Bright, 0.56 in (14.2 mm) LED display
Automatic polarity
Display hold and test
115/230 Vac power
EMI/RFI filter for AC power
Screw-terminal barrier strip
Short 4.1 in (104 mm deep) 1/8 DIN case

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

Model 202A-P is a low-cost 3 1/2 digit (±1,999 count) process meter for applications where indication-only is required. It provides a span adjustment of 2,000 counts for all signals, a zero adjustment of ±1,000 counts for input signals of 4-20 mA and 1-5 V and a zero adjustment of 1,500 to +500 counts for input signals of 0-10 V. Scaling and calibration are easily accomplished in the field by multiturn potentiometers accessible behind the lens. Accuracy is 99.9% of reading.

The 202A-P can also be used in ratiometric pot-follower applications to determine liquid level or valve setting from the position of a potentiometric wiper. The required external reference voltage can be derived from the meter's own 4.7 V dc supply.

COMPACT CASE
The 202A-P is housed in a 1/8 DIN case that requires less than 4.1 in (104 mm) behind the panel. A screw-terminal barrier strip for signal and power is standard.

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 V dc and 4.7 V dc power, and a splash-proof lens cover which meets NEMA-4 requirements.

SPECIFICATIONS

ANALOG INPUT

Range	4-20 mA	1-5 V	0-10 V
Input resistance	13 kohm	1 Mohm	1 Mohm
Bias current	50 pA	10 pA	5 pA
Maximum input	55 mA	250 V	250 V
Ratiometric reference	0.1 or 1.0 V dc +100%/50%

NOISE REJECTION
NMR, SIG HI to SIG LO: 56 dB, 50/60 Hz
CMR, SIG GND to SIG HI: 120 dB, DC to 60 Hz
CMR, SIG GND to PWR GND: 120 dB, DC to 60 Hz
CMV, SIG GND to PWR GND: 1500 Vp per HV test, 354 Vp per IEC spacing

ACCURACY AT 25°C
Maximum error: ±0.05% of reading ±1 count
Zero tempco: ±0.01% of offset/°C
Span tempco, ratiometric: ±0.01% of reading/°C
Span tempco, non-ratiometric: ±0.03% of reading/°C
Full-scale step response: 1 s
Warmup to rated accuracy: 1 min

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: Three positions, programmable by jumpers or at connector, 10 mA sink
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 to 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