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TWO-WIRE,
LOOP-POWERED PROCESS INDICATOR
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DESCRIPTION
Model 558B is a 1/8 DIN-sized two-wire current-loop indicator that
is powered directly by 1-5 mA, 4-20 mA or 10-50 mA process signals,
with no need for external power connections. This reduces field
wiring costs and provides immunity from most electrical noise encountered
in process-control environments. The two-wire electrical hookup
is easy via a plug-in screw-clamp connector, which is standard.
READOUT OF PROCESS VARIABLES
The 558B provides extensive zero and span adjustment capability
for direct readout in percent or in engineering units for process
variables such as pressure, flow, temperature, or level. A 0.50
in (12.7 mm) high LCD display provides 3 1/2 active digits for readout
to ±1,999, two jumper-selectable dummy right-hand zeros for display
to ±19,990 or ±199,900, and five jumper-selectable decimal points.
With the dummy zeros, the 558B can thus be used to display the weight
of heavy trucks in pounds or the volume of large tanks in gallons.
EASY TO CONFIGURE AND CALIBRATE
Both span and zero are fine-tuned with precision 15-turn potentiometers
accessible behind the lens. Coarse zero and span steps as well as
the dummy right-hand zero are selected by opening the case and changing
push-on jumpers.
INTRINSIC
SAFETY CERTIFICATION
FM intrinsic safety certification is standard. Intrinsic safety
certification allows the 558B to be used in worst-case hazardous
environments with no need for an explosion-proof housing, provided
that an intrinsic safety barrier is used to limit the voltage and
current that may be introduced in the hazardous environment.
FM certification (USA) is for Class I, II, III, Division 1, Groups
A, B, C, D, E, F, G. The FM certification number is 2Y4A4.AX (3610).
BUILT FOR INDUSTRIAL ENVIRONMENTS
Model 558B is housed in NEWPORT's DIN 4896-100 case, which is splash
resistant and requires a depth of less than 3.9" (100 mm) behind
the panel. A splash-proof lens cover which meets NEMA-4 requirements
is optional. Electrical connections are via a three-pole male header
connector on the circuit board and a mating plug-in socket connector
with screw clamps, which accommodate wire sizes of 0.5-2.5 mm2 (26-16
AWG). These supplied connectors provide easy and reliable electrical
connections and meet UL and IEC-348 safety requirements.
SPECIFICATIONS
SIGNAL INPUT
Signal: 1-5 mA, 4-20 mA or 10-50 mA (jumper-selectable)
Linear Range: 0.3 to 50 mA
Protection: Up to 200 mA forward, 1000 mA reverse
Forward voltage drop, max: 2.5 V
Input Resistance: 50 ohm at 1-5 mA, 12.5 ohm at 4-20 mA,
5 ohm at 10-50 mA
Zero Adjust: –2,000 to +2,000 counts in 4 jumper- selectable
ranges plus fine adjustment 00
Span Adjust: 100 to 2,000 counts with fine adjustment
NMR: 46 dB, 50/60 Hz
CMR: (meter to case) 120 dB, DC to 60 Hz
CMV: (meter to case) 300 Vac
ACCURACY AT 25°C
Maximum Error: ±0.1% of reading ±1 count
Zero Tempco: ±0.1 count/°C typical, ±0.3 count/°C max
Span Tempco: ±0.005% of span/°C typical, ±0.015% of span/°C
max
ANALOG-TO-DIGITAL CONVERSION
Technique: Dual-slope, average-value
Polarity: Automatic
Integration Period: 100 msec
Read Rate: 2.5/sec
DISPLAY
Type: 7-segment, LED
Height: 0.50" (12.7 mm)
Symbols: –1.8.8.8.0.0 (3 1/2 active digits plus two jumper-selectable
dummy right-hand zeros)
Decimal Points: Five positions, jumper-selectable
Overrange Indication: Three least-significant active digits
blank
ENVIRONMENTAL
Operating Temperature, Standard: 0 to 55°C (32 to 122°F)
Operating Temperature, Optional: –40 to +85°C (–40 to +185°F)
Relative Humidity: 95% at 40°C (non-condensing)
MECHANICAL
Case: NEWPORT DIN 4896-100
Panel Cutout: 1.77 x 3.62 in (45 x 92 mm)
Bezel Dimensions: 1.89" x 3.79" x 0.31" (48 x 96 x 8 mm)
Depth Behind Bezel: 3.94" (100 mm)
Weight: 4.5 oz (128 g)
Case Material: 94V-0 UL-rated polycarbonate
Circuit Board Connector: Three-pole male header
Cable Connector (Standard): Mating plug-in socket with screw-clamps
for wire sizes 0.5 - 2.5 mm2 (26-16 AWG)
Connector Safety Ratings: UL and IEC-348
