3 1/2 Digit Process Meter

LOW-COST
3 1/2 DIGIT PROCESS METER with TRANSMITTER EXCITATION
MODEL 202A-E

1/8 DIN (2A) Case

Connections Diagram

STANDARD FEATURES
Isolated transmitter excitation supply
50 mA current output at 10 to 24 V dc
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 V ac 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 V dc power
Isolated 26-56 V dc power
NEMA-4 splash-proof lens cover

BUILT-IN TRANSMITTER EXCITATION SUPPLY
Model 202A-E is a low-cost 3 1/2 digit process meter which incorporates an electrically-floating supply for powering transmitters, active transducers and bridges. In many cases, this built-in supply can eliminate the need for a more expensive external supply. The output voltage is adjustable from 10 to 24 V dc. Maximum output current is 50 mA at any voltage setting.

LOW-COST PROCESS MONITOR
Except for the excitation supply, the 202A-E is identical to the 202A-P, a low-cost 3 1/2 digit (±1,999-count) process meter for applications where indication-only is required. It provides zero and span adjustments of 2,000 counts each for readout in engineering units from signals such as 4-20 mA, 1-5 V and 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.

COMPACT CASE
The 202A-E 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 ohm	1 Mohm	1 Mohm
Bias current	50 pA	10 pA	5 pA
Maximum input	55 mA	250 V	250 V
Ratiometric reference	0.05 - 0.2 or 0.5 - 2 V dc

NOISE REJECTION
NMR, SIG HI to SIG LO: 56 dB, 50/60 Hz
CMR, SIG GND to SIG HI: 120 dB at gain 100, 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

TRANSMITTER EXCITATION SUPPLY
Output voltage: Adjustable from 10 to 24 V dc
Output current, max: 50 mA
Line regulation: ±0.01%/V of AC power
Load regulation: ±0.5%
Tempco: ±0.02%/°C
Ripple at 50/60 Hz: ±0.01%

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

Model 202A-E with electrically-floating excitation supply and process signal conditioner, configured for operation with a 2-wire 4-20 mA transmitter (powered by 4-20 mA loop). Excitation return is tied to signal low.

Model 202A-E with electrically-floating excitation supply and process signal conditioner, configured for operation with a 4-wire transmitter. The transmitter signal may be DC Voltage or current.