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1/8 DIN Two-Wire, Current Loop Process Indicator with LCD

Two-wire, Current Loop Process Indicator
FM Intrinsic Safety Certification, Standard
Powered by 1-5 mA, 4-20 mA or 10-50 mA Signal
2.5 V Max Voltage Drop
Display to ±1,999, ±19,990 or ±199,900
0.5 inch (12.7 mm) Liquid-Crystal Display
100 to 2,000 Count Span Adjust
2,000-Count Zero Suppression or Elevation
Short 1/8 DIN Case
Simple 2-Wire Hook Up
Safe Plug-in Screw-Clamp Connector

–40 to +85°C Operating Temperature
NEMA-4 Splash-Proof Lens Cover

1 Year Warranty

The 558B Series series has been discontinued. Please see the TXUN as a possible alternative or contact our Electronics Engineering department.

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.

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.

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.

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 2P1A7.AX (3610:2010)

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.


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

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

Technique: Dual-slope, average-value
Polarity: Automatic
Integration Period: 100 msec
Read Rate: 2.5/sec

Type: 7-segment LCD
Color: Black digits with white background
Symbols: -  12.7 mm (0.5 in) height
Polarity: Minus sign
Overrange Indication: Three least-significant digits blank
Extra Digits: One or two dummy right-hand zeros, jumper-selectable
Decimal Points: Five positions, jumper-selectable

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)

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
All dollar amounts on this site are shown in US currency.

Keywords: Two-Wire, Current Loop Power, Process Indicator, LCD display, FM Certification, Intrinsic Safety, 558B

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